CN117648874B - Slope excavation full-period mechanical parameter dynamic inversion method based on monitoring displacement - Google Patents
Slope excavation full-period mechanical parameter dynamic inversion method based on monitoring displacement Download PDFInfo
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 351
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 222
- 238000012544 monitoring process Methods 0.000 title claims abstract description 155
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- 238000012549 training Methods 0.000 description 9
- 239000011435 rock Substances 0.000 description 8
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Abstract
The invention discloses a slope excavation full-period mechanical parameter dynamic inversion method based on monitoring displacement, which comprises the steps of obtaining a parameter change area of each level excavation influence of a slope; carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the top-level excavation to obtain the mechanical parameter of the parameter change area corresponding to the top-level excavation; and excavating the side slope step by step downwards from the top level, and carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the current excavation level and the displacement increment values of the parameter change areas corresponding to all levels above the current excavation level to obtain the mechanical parameters of the parameter change area corresponding to each subsequent excavation level. According to the invention, the deformation information caused by the excavation of each grade of side slope is captured by the pre-buried displacement monitoring instrument before the excavation of each grade of side slope, the mechanical parameters are inverted by utilizing the displacement increment value of the corresponding parameter change area during the excavation of each grade of side slope, and the defects that a part of deformation information record caused by the excavation of the side slope is missing and the displacement value is different in monitoring time scale during inversion are overcome.
Description
Technical Field
The invention belongs to the technical field of slope engineering, and particularly relates to a slope excavation full-period mechanical parameter dynamic inversion method based on displacement monitoring in a construction period.
Background
In the side slope engineering, safety problems such as landslide, local collapse and the like frequently occur due to the fact that construction excavation is easy to be disturbed and limited by factors such as larger influence of surrounding environment and the like. How to determine reliable mechanical parameters is a key for carrying out stable analysis on each level of slope excavation in the construction period by means of rock-soil numerical calculation. Along with the gradient excavation from top to bottom in the construction area, rock mass parameters near the excavated surface are in a dynamic change process under the actions of disturbance, unloading and the like, and the subsequent excavation of each layer can also influence the adjustment of mechanical parameters of the rock mass near the excavated surface above.
Under the restriction of factors such as the discontinuity of a rock-soil body and the size effect, the parameters of the rock-soil body determined through indoor and outdoor experiments have limitations, and the method for inverting the parameters related to the slope by adopting displacement information of on-site monitoring is widely applied. However, there are several types of problems with current parametric inversion using monitored displacement for the slope grading excavation phase during construction: firstly, a monitoring instrument of each level of side slope is generally buried after the excavation of the side slope of the level is finished, deformation information caused by the excavation of the side slope of the level cannot be obtained, and the loss of key information leads to the failure of inversion of mechanical parameters of rock-soil body changes near the excavation surface caused by the excavation of the side slope of the level; secondly, in the current selection of monitoring displacement information, workers usually adopt accumulated displacement values of instruments to perform inversion, and the burying sequence of each level of slope monitoring instruments in engineering practice cannot be unified in time span, so that the result obtained by using the monitoring displacement to perform parameter inversion method in the slope grading excavation stage in the construction period is inaccurate.
Disclosure of Invention
The application aims to provide a dynamic inversion method of slope excavation full-period mechanical parameters in a construction period based on monitoring displacement, which aims to solve the technical problems that displacement values are different in monitoring time scale when the existing slope grading excavation mechanical parameter inversion is carried out, and inversion results are inaccurate if cumulative displacement values are uniformly used.
The invention provides a method for dynamically inverting full-period mechanical parameters of slope excavation in construction period based on displacement monitoring, which comprises the following steps:
Step 1, acquiring a parameter change area influenced by each level of excavation of a side slope;
step 2, carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the top-level excavation, and obtaining the mechanical parameter of the parameter change area corresponding to the top-level excavation;
And step 3, excavating the side slope step by step downwards from the top level, and carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the current excavation level and the displacement increment values of the parameter change areas corresponding to all levels above the current excavation level, so as to finally obtain the mechanical parameters of the parameter change area corresponding to each subsequent excavation level.
Preferably, the mechanical parameter inversion is performed according to the displacement increment value of the corresponding parameter change area of the top-level excavation, which specifically comprises the following steps:
And carrying out mechanical parameter inversion according to displacement increment values at a plurality of monitoring points vertically arranged in the corresponding parameter change area of the top-level excavation.
Preferably, the method for determining the displacement increment values at a plurality of monitoring points vertically arranged in the corresponding parameter change area of the top excavation comprises the following steps:
According to the two slope section models before and after top excavation and the mechanical parameter uniform design table of the corresponding parameter change area of the top excavation, determining deformation displacement values of the vertically arranged monitoring points when the top excavation is finished;
determining deformation displacement values of the plurality of vertically arranged monitoring points when the slope is not excavated according to initial mechanical parameters of the slope before excavation;
And determining displacement increment values at the plurality of vertically arranged monitoring points according to the difference value between the deformation displacement value when the top-level excavation is finished and the deformation displacement value when the top-level excavation is not finished.
Preferably, the mechanical parameters in the mechanical parameter uniformity design table include elastic modulus, cohesion and internal friction angle.
Preferably, mechanical parameter inversion is performed according to displacement increment values at a plurality of vertically arranged monitoring points in a top-level excavation corresponding parameter change area, so as to obtain mechanical parameters of the top-level excavation corresponding parameter change area, and the method specifically comprises the following steps:
Utilizing the displacement increment values and the mechanical parameters of a plurality of monitoring points vertically arranged in a corresponding parameter change area of top excavation to train a mechanical parameter inversion model;
Inputting the actual displacement increment value of the parameter change area corresponding to the top-level excavation into the trained mechanical parameter inversion model to obtain the mechanical parameter of the parameter change area corresponding to the top-level excavation.
Preferably, after obtaining the mechanical parameters of the corresponding parameter change area of the top-level excavation, the method further comprises:
determining and calculating a displacement increment value by utilizing the mechanical parameters of the top-level excavation corresponding parameter change area;
And determining whether the mechanical parameters of the parameter change area corresponding to the top excavation can reflect the real situation after the side slope top excavation according to the calculated displacement increment value and the actual displacement increment value of the parameter change area corresponding to the top excavation.
Preferably, the step 3 specifically includes:
Step 3.1, excavating the side slope step by step downwards from the top level, and obtaining displacement increment values at a plurality of monitoring points vertically arranged in a parameter change area corresponding to the current excavation level and displacement increment values at a plurality of monitoring points vertically and horizontally arranged in the parameter change area corresponding to all levels above the current excavation level;
And 3.2, carrying out mechanical parameter inversion according to the displacement increment value obtained in the step 3.1, and finally obtaining the mechanical parameters of the corresponding parameter change area of each subsequent excavation stage.
Preferably, after step 3, the method further comprises:
and carrying out mechanical parameter inversion on the displacement increment values of all the parameter change areas from the end of the final-stage excavation to the preset moment, and obtaining the parameter index after the adjustment of the whole parameter area.
Preferably, the displacement increment value of the parameter change area corresponding to the excavation of the last stage is the displacement increment value of a plurality of monitoring points vertically and horizontally arranged in the parameter change area.
Compared with the prior art, the method for dynamically inverting the full-period mechanical parameters of the slope excavation in the construction period based on the monitoring displacement has the following beneficial effects:
The invention provides a method for capturing deformation information caused by excavation of each grade of side slope by pre-burying monitoring instruments before excavation of each grade of side slope, inverting mechanical parameters by utilizing increment values of the displacement information recorded by the corresponding monitoring instruments in each grade of side slope excavation period, overcoming the defects of partial deformation information record deficiency caused by excavation of the side slope and displacement values being different in monitoring time scale during inversion, and realizing dynamic inversion of the full-period mechanical parameters of the side slope excavation in the construction period.
Drawings
FIG. 1 is a flow chart of a dynamic inversion method of full period mechanical parameters of slope excavation based on monitoring displacement;
FIG. 2 is a schematic illustration of an unexcavated section of a side slope in an embodiment of the invention;
FIG. 3 is a schematic diagram of a top slope excavation end section in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second-stage slope excavation end section in an embodiment of the present invention;
Fig. 5 is a schematic diagram of a third-stage slope excavation end section in an embodiment of the present invention.
In the figure: 1 is a side slope; 2 is a potential sliding surface; 3 is a first displacement monitoring instrument; 4, excavating a corresponding parameter change area for the top level; 5, excavating a corresponding parameter change area for the second stage; 6, excavating a corresponding parameter change area in the third stage; 7 is a second displacement monitoring instrument; 8 is a top grade horse way; 9 is a top-level excavation surface; 10 is a third displacement monitoring instrument; 11 is a fourth displacement monitoring instrument; 12 is a second-stage horse race; 13 is a second-stage excavation surface; 14 is a fifth displacement monitoring instrument; 15 is a sixth displacement monitoring instrument; and 16 is a third-stage excavation surface.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The embodiment of the invention provides a method for dynamically inverting the full-period mechanical parameters of slope excavation in a construction period based on monitoring displacement, which aims to solve the problems of partial deformation information record missing caused by slope excavation and different displacement values used for inversion in a monitoring time scale in the prior art, and comprises the following steps of:
step 1, acquiring a parameter change area influenced by each level of excavation of a side slope, which specifically comprises the following steps:
step 1.1, acquiring potential sliding surfaces of a side slope, wherein the potential sliding surfaces comprise:
And determining potential sliding surfaces and initial mechanical parameters before slope excavation through engineering geological investigation and indoor and outdoor experimental data.
Wherein the potential sliding surface is the boundary between the rock mass stabilization zone and the parameter change zone affected by the excavation; the initial mechanical parameters include elastic modulus, cohesion, internal friction angle, etc. of the rock mass.
And 1.2, determining a parameter change area of each stage of excavation influence according to the potential sliding surface.
When the side slope is excavated in a grading way from top to bottom, the excavation level is more than 2. In the embodiment, 3-level excavation is taken as an illustration, and the method for dynamically inverting the full-period mechanical parameters of slope excavation in the construction period based on displacement monitoring is provided.
Illustratively, the slope is excavated from top to bottom in three stages, and a parameter change area influenced by the excavation effect of each stage is determined according to the design excavation area and the potential sliding surface, and specifically comprises the following steps: the top-level excavation corresponds to the parameter change area, the second-level excavation corresponds to the parameter change area and the third-level excavation corresponds to the parameter change area.
And when the slope excavation is finished and enters the service period, the mechanical parameters of each parameter change area gradually converge.
And 2, carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the top-level excavation, and obtaining the mechanical parameter of the parameter change area corresponding to the top-level excavation.
Before top excavation, the embodiment of the invention vertically embeds a displacement monitoring instrument on the top of a slope, wherein the displacement monitoring instrument is provided with a plurality of monitoring points which are equally spacedThe displacement monitoring instrument is used for recording deformation displacement values of the corresponding parameter change areas of the top-level excavation. Illustratively, the displacement monitoring instrument has 4 monitoring points.
Step 2 of the embodiment of the present invention specifically includes: carrying out mechanical parameter inversion according to displacement increment values at a plurality of monitoring points vertically arranged in a top-level excavation corresponding parameter change area, wherein the mechanical parameter inversion specifically comprises the following steps:
Step 2.1, obtaining displacement increment values of a plurality of vertically arranged monitoring points in a top-level excavation corresponding parameter change area, wherein the displacement increment values comprise the following specific steps:
And 2.1.1, determining deformation displacement values at a plurality of monitoring points vertically arranged at the end of top excavation according to two slope section models before and after top excavation and a mechanical parameter uniform design table of a corresponding parameter change area of the top excavation.
The two slope section models before and after the top level excavation are a slope section model when the top level excavation is not excavated and a slope section model when the top level excavation is finished, and the two slope section models are constructed based on actual excavation measures.
The mechanical parameter uniform design table of the corresponding parameter change area of the top excavation is obtained by the following steps:
when the top-level excavation is finished, selecting the elastic modulus, the cohesive force and the internal friction angle of a parameter change area corresponding to the top-level excavation as subsequent inversion parameters, and determining the value range of the inversion parameters according to a rock mass parameter test and engineering experience; and carrying out a uniform design test based on the value range of each parameter to obtain a mechanical parameter uniform design table of the top-level excavation corresponding to the parameter change area. The uniform design table can be used as a training sample of a subsequent mechanical parameter inversion model.
Further, deformation displacement values of a plurality of monitoring points vertically arranged at the end of top excavation are determined, and the deformation displacement values are specifically:
And calculating deformation displacement values of a plurality of monitoring points vertically arranged in the corresponding parameter change area when the top excavation is finished according to the two slope section models before and after the top excavation and by combining a mechanical parameter uniform design table of the corresponding parameter change area of the top excavation.
And 2.1.2, determining deformation displacement values at a plurality of monitoring points vertically arranged when the slope is not excavated according to initial mechanical parameters of the slope before the slope is excavated, wherein the initial mechanical parameters are obtained in the step 1.1.
And 2.1.3, determining displacement increment values at a plurality of vertically arranged monitoring points according to the difference value between the deformation displacement value at the end of top-level excavation and the deformation displacement value at the time of non-excavation, and obtaining the displacement increment value at each monitoring point.
And 2.2, carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the top-level excavation to obtain the mechanical parameter of the parameter change area corresponding to the top-level excavation, wherein the method specifically comprises the following steps:
2.2.1, training a mechanical parameter inversion model by utilizing displacement increment values and mechanical parameters at a plurality of monitoring points vertically arranged in a corresponding parameter change area of top excavation; wherein the mechanical parameter inversion model is a neural network model.
The input set is the elastic modulus, the cohesive force and the internal friction angle of the corresponding parameter change area of the top excavation, the elastic modulus, the cohesive force and the internal friction angle are obtained from a uniform design table, and the output set is the displacement increment value of each monitoring point in the corresponding parameter change area in the top excavation period; and training the mechanical parameter inversion model by using the normalized input set and the normalized output set until the error meets the precision requirement.
And 2.2.1, inputting the actual displacement increment value of the parameter change area corresponding to the top-level excavation into a trained mechanical parameter inversion model to obtain the mechanical parameter of the parameter change area corresponding to the top-level excavation, and completing the first inversion.
After obtaining the mechanical parameters of the top-level excavation corresponding parameter change area, the embodiment of the invention further comprises the following steps:
And (3) carrying out positive analysis and calculation by utilizing the mechanical parameters of the corresponding parameter change area of the top excavation, and determining calculated displacement increment values (in the top excavation period) at each monitoring point.
According to the calculated displacement increment value and the actual displacement increment value of the parameter change area corresponding to the top excavation, determining whether the mechanical parameter of the parameter change area corresponding to the top excavation can reflect the actual situation after the top excavation of the side slope, specifically:
If the error between the calculated displacement increment value and the actual displacement increment value is smaller than 10%, and the engineering requirement is met, the mechanical parameters of the parameter change area corresponding to the top excavation can reflect the actual condition of the slope after the first excavation is finished.
Step 3, excavating the side slope step by step downwards from the top level, and carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the current excavation level and the displacement increment value of the parameter change area corresponding to all levels above the current excavation level, so as to finally obtain the mechanical parameters of the parameter change area corresponding to each subsequent excavation level, which comprises the following steps:
Step 3.1, excavating the side slope step by step downwards from the top level, and obtaining displacement increment values of a plurality of monitoring points vertically arranged in a parameter change area corresponding to the current excavation level and displacement increment values of a plurality of monitoring points vertically and horizontally arranged in the parameter change area corresponding to all levels above the current excavation level.
And 3.2, carrying out mechanical parameter inversion according to the displacement increment value obtained in the step 3.1, and finally obtaining the mechanical parameters of the corresponding parameter change area of each subsequent excavation stage.
The embodiment of the invention continues to illustrate step 3 by taking three-level excavation as an example:
And after the top-level excavation is finished, performing second-level excavation.
Before the second-stage excavation, the displacement monitoring instrument is buried horizontally on the top-stage excavation surface, so that the displacement monitoring instrument is combined with a vertical displacement monitoring instrument buried at the top of a slope to record displacement increment generated by the influence of the second-stage excavation on a corresponding parameter change area of the top-stage excavation;
further, the embodiment of the invention further discloses a displacement monitoring instrument which is vertically buried on the top-level catwalk and is used for recording the deformation displacement value in the corresponding parameter change area of the second-level excavation.
And (2) after the second-stage excavation is finished, the mechanical parameters of the parameter change area corresponding to the second-stage excavation are changed, and under the disturbance effect of the second-stage excavation, the mechanical parameters of the parameter change area of the previous stage are changed compared with the inversion result in the step (2). Therefore, the embodiment of the invention selects the elastic modulus of the upper-level parameter change areaCohesive force/>Internal friction angle/>And elastic modulus/>, of the present-stage parameter variation regionCohesive force/>Internal friction angle/>And 2, determining the value range of the parameter to be inverted according to the inversion result of the top excavation in the step 2 and engineering experience, and performing a uniform design test to form a mechanical parameter uniform design table as in the step 2.1.1.
And (3) establishing a slope profile model at the end of the second-stage excavation of the slope, wherein the slope profile model is established based on actual excavation measures.
And calculating deformation displacement values of all monitoring points after the second-stage excavation of the side slope is finished according to the mechanical parameter uniform design table of the second-stage excavation, and calculating deformation displacement values of the top-stage excavation of the side slope according to inversion results of the top-stage excavation, wherein the deformation displacement values are corresponding to all the combined samples in the mechanical parameter uniform design table of the second-stage excavation, and the displacement increment values of the positions of the monitoring points in the second-stage excavation period of the side slope can be obtained by subtracting the deformation displacement values.
Designing a mechanical parameter inversion model, wherein the model is a neural network model, an input set is mechanical parameters of a parameter change area corresponding to top-level excavation and current-level excavation, and an output set is a displacement increment value of each monitoring point in a second-level excavation period; and carrying out network training after carrying out normalization processing on the input set and the output set, and carrying out actual monitoring displacement increment value brought into the second-stage excavation after the error meets the precision requirement to obtain the mechanical parameters (second inversion) of the second-stage excavation corresponding parameter change area.
And (3) performing forward analysis calculation on inversion results obtained by mechanical parameters of a parameter change area corresponding to the second-stage excavation to obtain calculated displacement increment values (in a second-stage excavation period) corresponding to the positions of all monitoring points, wherein if the error between the displacement increment values calculated by using the inversion parameters and the actual displacement increment values is less than 10%, the mechanical parameters of the parameter change area corresponding to the second-stage excavation can reflect the actual condition of the slope after the second-stage excavation is completed, and the engineering requirements are met.
Before the third-stage excavation of the side slope is carried out, a displacement monitoring instrument is buried horizontally on the excavation surface of the second-stage side slope, and the displacement increment generated by the influence of the third-stage side slope excavation on the corresponding parameter change area of the second-stage excavation is recorded by combining the monitoring instrument buried in the first-stage catwalk; in addition, a displacement monitoring instrument on the excavation surface of the top slope is combined with a burying instrument on the top of the slope, and displacement increment generated by the influence of the third-level slope excavation on the corresponding parameter change area of the top-level excavation is recorded; and a displacement monitoring instrument is vertically buried on the second-stage horse road and is used for recording the deformation displacement value in the parameter change area corresponding to the third-stage excavation.
After the third-stage excavation of the side slope is finished, the mechanical parameters of the parameter change area corresponding to the third-stage excavation are changed, and under the disturbance effect of the third-stage excavation, the parameters of the upper two-stage change area are changed compared with the inversion result obtained after the second-stage excavation is finished. Therefore, the mechanical parameters of the upper two-stage change area are selected: modulus of elasticity、/>Cohesive force/>、/>Internal friction angle/>、/>And elastic modulus of the present-stage change region/>Cohesive force/>Internal friction angle/>And as inversion parameters, determining the value range of the parameters to be inverted according to the inversion result of the second-stage excavation and engineering experience, and then performing a uniform design test to form a mechanical parameter uniform design table of the third-stage excavation.
And (3) establishing a slope profile model when the third-stage excavation is finished based on actual excavation measures, calculating deformation displacement values of all monitoring points corresponding to the third-stage excavation of the slope by all combined samples in a mechanical parameter uniform design table of the third-stage excavation, and calculating the deformation displacement values of all the monitoring points after the second-stage excavation of the slope is finished according to a second-stage excavation inversion result, wherein the deformation displacement values are subtracted from the deformation displacement values of all the monitoring points to obtain a displacement increment value of the monitoring points in the third-stage excavation period of the slope.
Designing a mechanical parameter inversion model, wherein the model is a neural network model, an input set is mechanical parameters of a parameter change area corresponding to top-level excavation, second-level excavation and current-level excavation, and an output set is a displacement increment value of each monitoring point in a third-level excavation period; and carrying out network training after carrying out normalization processing on the input set and the output set, and carrying out actual monitoring displacement increment value of the third-stage excavation after the error meets the precision requirement to obtain the mechanical parameters (third inversion) of the corresponding parameter change area of the third-stage excavation.
And (3) performing positive analysis calculation on inversion results obtained by mechanical parameters of a parameter change area corresponding to the third-stage excavation to obtain calculated displacement increment values (in a third-stage excavation period) corresponding to the positions of all monitoring points, and if the error between the displacement increment values calculated by using the inversion parameters and the actual displacement increment values is less than 10%, meeting engineering requirements, reflecting the actual conditions of the slope after the third-stage excavation is completed by the mechanical parameters of the parameter change area corresponding to the third-stage excavation.
The embodiment of the invention further comprises the following steps after the step 3:
And carrying out mechanical parameter inversion on the displacement increment values of all the parameter change areas from the end of the final-stage excavation to the preset moment to obtain equivalent mechanical parameters of all the parameter change areas. The displacement increment value of the parameter change area corresponding to the final-stage excavation is the displacement increment value of a plurality of monitoring points vertically and horizontally arranged in the parameter change area.
The last level of excavation in the embodiments of the present invention is denoted as third level excavation.
And after the third-stage excavation of the side slope is finished, embedding a displacement monitoring instrument in the horizontal direction of the third-stage excavation surface. As the side slope enters the service period, the displacement value of each monitoring point tends to be stable along with the time change, the mechanical parameters of each change area gradually converge, and the moment (preset moment) is recorded; selecting actual displacement increment values of all monitoring points in the model profile in a period from the end of third-stage excavation of the side slope to the stabilization of the monitoring displacement values to invert all change areas after parameter convergence、/>、/>、/>、/>、/>、/>、/>、/>(Fourth inversion), method steps are as above.
When the magnitude of the monitored displacement value tends to be stable, the dynamic adjustment of the whole slope displacement field and the stress field is finished, the magnitude of the inversion result of each parameter change area approaches to and tends to a fixed value, and the fixed value is used as a parameter index after the adjustment of the whole parameter change area is finished.
The method of the present invention will be described in detail with reference to specific examples.
The invention discloses a slope excavation full-period mechanical parameter dynamic inversion method based on monitoring displacement, which takes a slope excavated in three stages as an embodiment, as shown in fig. 2 to 5, and is implemented specifically according to the following steps:
step 1, as shown in fig. 2, determining initial mechanical parameters and potential sliding surfaces 2 before excavation of a side slope 1 through engineering geological survey and indoor and outdoor experimental data, wherein the mechanical parameters in the side slope comprise the elastic modulus of a rock mass Cohesive force/>Internal friction angle/>Etc., the potential sliding surface 2 serves as a boundary between the stable region of the rock mass and the variable region of the parameter affected by the excavation. Fig. 2 shows that the slope 1 is excavated in three stages from top to bottom, when the top stage (first stage) is excavated, the area formed by the top stage excavation surface 9 and the potential sliding surface 2 is the parameter change area 4 corresponding to the top stage excavation of the slope, and the area corresponding to the non-excavated part maintains the initial mechanical parameters unchanged; when the second-stage excavation of the side slope is completed, the area formed by the second-stage excavation surface 13 and the potential sliding surface 2 is a second-stage excavation corresponding parameter change area 5, and the second-stage excavation also affects the mechanical parameters in the top-stage excavation corresponding parameter change area 4, so that the area corresponding to the non-excavated part maintains unchanged initial mechanical parameters; when the third-level excavation of the side slope is completed, the area formed by the third-level excavation surface 16 and the potential sliding surface 2 is a third-level excavation corresponding parameter change area 6, and the third-level excavation also affects the mechanical parameters in the top-level excavation corresponding parameter change area 4 and the second-level excavation corresponding parameter change area 5; and (3) finishing the slope excavation, entering a service period, and gradually converging the mechanical parameters of each parameter change area.
Step 2, arranging four monitoring points on each instrument set in the embodiment, wherein the monitoring points are equally spacedThe measured data are horizontal displacement monitoring values at the orifice and the depth is/>Is of depth/>Is of depth/>Is a horizontal displacement monitor value of (a); as shown in fig. 2, a first displacement monitoring instrument 3 is vertically buried on the top of the slope before the slope is excavated, the first displacement monitoring instrument 3 is used for recording deformation displacement values of a top-level excavation corresponding parameter change area 4 caused by the top-level excavation, and the set of instruments is numbered as/>。
Step 3, after the top excavation of the side slope is finished, selecting the elastic modulus of the parameter change area 4 corresponding to the top excavationCohesive force/>Internal friction angle/>As inversion parameters, determining the value range of the parameters to be inverted according to a rock mass parameter test and engineering experience, wherein the value range is shown in table 1; the inversion training sample is established based on the value ranges of the parameters, the training sample data is required to be in the value ranges of the parameters, representative value points are selected as far as possible, all data in the range can be contained, the workload is not too large, and as inversion parameters are more in types, a uniform design test is carried out to form a uniform parameter design table, as shown in table 2, the number of the uniform design is 3, and the level number of each factor is 20.
TABLE 1 parameter values to be inverted range (end of excavation of top grade of side slope)
Note that: in the tableThe subscript values 1,2,3 of (2) represent the sequence numbers of the parameters involved in inversion, the corresponding mechanical parameters have different dimensions,/>The values are different in size range and the same as the following.
Table 2 design table for uniform test (end of side slope top excavation)
Note that: in the tableThe superscript numbers 1,2, … …,20 indicate the sample numbers of the participating uniform design tables, as follows.
Step 4, establishing a profile model of the side slope without excavation based on actual excavation measuresSection model/>, at end of excavation of top grade of side slopeThe side slope preparation excavation time is/>The end time of the top excavation of the side slope is/>Combining each group of parameter samples of the parameter uniform design table obtained in the step 3, and calculating the corresponding/>Instrument in model/>The displacement value/>, of the position of the monitoring point at position 4、/>、/>、/>; Calculation/> based on initial mechanical parametersInstrument in model/>The displacement value/>, of the position of the monitoring point at position 4、/>、/>、/>。
First-stage excavation period of side slopeInternal instrument/>The displacement increment value of the position of the monitoring point at 4 positions (1) can be calculated according to the following formula；/>；；/>。
Step 5, designing a neural network, wherein an input set is each group of samples in the uniform test design table in step 3, and the samples comprise the elastic modulus of the top excavation corresponding to the parameter change area 4Cohesive force/>Internal friction angle/>The output set is the displacement increment value of the monitoring point at the position 4 in the step 4; in order to eliminate the difference of each factor in the magnitude and dimension of the input set and the output set, carrying out normalization processing, and carrying normalized data into a neural network for training; after all samples are trained, the monitoring points at the displacement monitoring instrument 4 are monitored in the period/>Measured actual displacement increment value/>、/>、/>、Substituting the elastic modulus as a target value, and performing inverse analysis to obtain the elastic modulus/>, of the parameter change region 4 after the error meets the accuracy requirement of the neural networkCohesive force/>Internal friction angle/>The inversion results are shown in table 3.
TABLE 3 parametric inversion results (end of excavation of top grade of side slope) under measured displacement values
Note that: in the tableThe superscript "×" of (a) indicates the inversion result obtained by substituting the measured value, and is the same as below.
Step 6, performing positive analysis calculation on the inversion result obtained in the step 5 to obtain a calculated displacement increment value of the monitoring point at the position of the corresponding first displacement monitoring instrument 4 under the inversion parameterTime period)/>、/>、/>、/>The comparison result of the calculated value and the monitored displacement increment value is shown in table 4; table 4 shows that the error between the displacement value calculated by using the inversion parameters and the actual monitoring value is less than 10%, so that the engineering requirements are met, and the inversion parameters can reflect the actual condition of the slope after the first-stage excavation is completed.
Table 4 results of comparing the calculated values with the actual monitored values (end of first-stage excavation of side slope)
Note that: in the tableRepresenting the serial numbers of monitoring points on each set of multipoint displacement meter,/>Representing the serial number of the multipoint displacement meter involved in the inversion.
Step 7, as shown in fig. 3, embedding a second displacement monitoring instrument 7 horizontally on a top-level excavation surface 9 before the second-level excavation is carried out on the side slope, wherein the second displacement monitoring instrument 7 and the first displacement monitoring instrument 3 together record displacement increment generated by the influence of the second-level excavation on a parameter change area 4 corresponding to the top-level excavation; the second displacement monitoring instrument 7 is 3 sets in total, the top, the middle and the bottom of the top-level excavation surface 9 are buried in sequence, and the 3 sets of instruments are numbered、/>、/>. A third displacement monitoring instrument 10 is vertically buried on the top-level horse way 8 and is used for recording deformation displacement values caused by the second-level excavation corresponding to the parameter change area 5 and numbering the third displacement monitoring instrument as/>。
And 8, after the second-stage excavation of the side slope is finished, the mechanical parameters of the second-stage excavation corresponding parameter change area 5 are changed, and under the disturbance effect of the second-stage excavation, the mechanical parameters of the top-stage excavation corresponding parameter change area 4 are changed compared with the inversion result after the top-stage excavation in the step 5 is finished. Thus selecting the elastic modulus of the top-level excavation corresponding parameter change area 4Cohesive force/>Internal friction angle/>And the second-stage excavation corresponds to the modulus of elasticity/>, of the parameter variation region 5Cohesive force/>Internal friction angle/>And 5, determining the value range of the parameter to be inverted according to the top-level excavation inversion result and engineering experience in the step 5 as the inversion parameter, wherein the value range is shown in table 5. The parameters for the uniform design test are shown in Table 6, as in step 3.
TABLE 5 parameter values to be inverted range (end of second excavation of slope)
TABLE 6 uniformity test design table (side slope second level excavation end)
Step 9, establishing a section model of the slope at the end of the second-stage excavation based on actual excavation and measuresThe end time of the second-stage excavation of the side slope is/>And (3) calculating/>, by combining each group of parameter samples in the parameter uniform design table obtained in the step (8)Instrument/>, in model section、/>、/>、/>、/>The displacement value/>, of the positions of 20 monitoring points、……、/>；/>、……、/>；/>、……、/>；/>、……、/>；/>、……、. Calculating the post-excavation/> of the top of the side slope according to the inversion result after the top is excavated in the step5Instrument/>, in model section、/>、/>、/>、/>Displacement value/>, of the position of the monitoring point、……、/>；/>、……、/>；、……、/>;/>、……、/>；/>、……、/>。
Period of second-stage excavation of side slopeInternal monitoring instrument/>、/>、/>、/>、/>The displacement increment value of the positions of the 20 monitoring points can be calculated according to the following formula:
;
;
;
;
。
Step 10, designing a neural network, wherein an input set is each group of samples in the uniform test design table in step 8, the samples comprise mechanical parameters of a top-level excavation corresponding parameter change area 4 and a second-level excavation corresponding parameter change area 5, and an output set is an instrument 、/>、/>、/>、/>A displacement increment value of the monitoring point; after training all samples, 20 monitoring points are set in period/>Measured actual displacement increment value/>、/>、……、/>、/>Substituting the elastic modulus as a target value, and reversely analyzing to obtain the elastic modulus/>, of the top-level excavation corresponding parameter change region 4 after the error meets the accuracy requirement of the neural networkCohesive force/>Internal friction angle/>And the second-stage excavation corresponds to the modulus of elasticity/>, of the parameter variation region 5Cohesive force/>Internal friction angle/>The inversion results are shown in table 7.
Table 7 parametric inversion results (end of second-stage excavation of slope) under actual measurement displacement values
Step 11, performing positive analysis and calculation on the inversion result obtained in the step 10 to obtain a displacement increment value calculated by the corresponding displacement meter monitoring point under the inversion parameterTime period)/>、/>、……、/>、/>The comparison result of the calculated value and the monitored value is shown in table 8; table 8 shows that the error between the displacement value calculated by using the inversion parameters and the actual monitoring value is less than 10%, so that the engineering requirements are met, and the inversion parameters can reflect the actual condition of the slope after the second-stage excavation is completed.
Table 8 results of comparing the calculated values with the actual monitored values (end of second-stage excavation of side slope)
Step 12, as shown in fig. 4, a fourth displacement monitoring instrument 11 is buried horizontally on the second-stage excavation surface 13 before the third-stage excavation is performed on the side slope, the fourth displacement monitoring instrument 11 and the third displacement monitoring instrument 10 together record displacement increment generated by the influence of the third-stage excavation on the second-stage excavation corresponding parameter change region 5, and the first displacement monitoring instrument 3 and the second displacement monitoring instrument 7 together record displacement increment generated by the influence of the third-stage excavation on the top-stage excavation corresponding parameter change region 4; the fourth displacement monitoring instrument 11 is 2 sets in total, the middle and the bottom of the excavation surface of the second-stage slope are buried in sequence, and the 2 sets of instruments are numbered、/>. A fifth displacement monitoring instrument 14 is vertically embedded in the second-stage horse way 12 and is used for recording deformation displacement values caused by the third-stage excavation corresponding to the parameter change area 6 corresponding to the third-stage excavation, and the instrument is numbered as/>。
And 13, after the third-stage excavation of the side slope is finished, the mechanical parameters of the corresponding parameter change area 6 of the third-stage excavation are changed, and under the disturbance effect of the third-stage excavation, the parameters of the corresponding parameter change area 4 of the top-stage excavation and the corresponding parameter change area 5 of the second-stage excavation are changed as compared with the inversion result after the second-stage excavation in the step 10 is finished. Thus selecting the elastic modulus of the top-level excavation corresponding parameter change area 4Cohesive force/>Internal friction angle/>Elastic modulus/>, second-stage excavation corresponding to parameter variation region 5Cohesive force/>Internal friction angle/>Elastic modulus/>, of three-stage excavation corresponding parameter variation region 6Cohesive force/>Internal friction angle/>As inversion parameters, the range of values of the parameters to be inverted is determined according to the inversion result of the second excavation in the step 10 and engineering experience, and is shown in table 9. The parameters for the uniform design test are shown in Table 10, as in step 3.
TABLE 9 parameter values to be inverted range (end of third level excavation of side slope)
Table 10 uniformity test design table (end third level excavation side slope)
Step 14, establishing a section model of the side slope at the end of the third-stage excavation based on actual excavation measuresThe third-stage excavation end time of the side slope is/>And (3) calculating/>, by combining each group of parameter samples in the parameter uniform design table obtained in the step (13)Instrument/>, in model section、/>、/>、/>、/>、/>、/>、/>The displacement value/>, of the position of the monitoring point at 32 positions、……、；/>、……、/>；……；/>、……、/>；/>、……、/>. And (2) calculating the/> after the second-stage excavation of the side slope according to the inversion result after the second-stage excavation in the step (10)Displacement value/>, of position of instrument monitoring point in model profile、……、/>；/>、……、/>；……； />、……、；/>、……、/>。
Third-stage excavation period of side slopeInternal monitoring instrument/>、/>、/>、/>、/>、/>、/>、/>The displacement increment value of the monitoring point at the monitoring point of (2) can be calculated according to the following formula:
;
;
;
。
Step 15, designing a neural network, wherein an input set is each group of samples in the uniform test design table in step 13, the samples comprise mechanical parameters of a top-level excavation corresponding parameter change area 4, a second-level excavation corresponding parameter change area 5 and a third-level excavation corresponding parameter change area 6, and an output set is an instrument 、/>、/>、/>、/>、/>、/>、/>A displacement increment value of the monitoring point; after all samples are trained, the monitoring point is in period/>Measured actual displacement increment value/>、/>、……、/>、/>Substituting the elastic modulus as a target value, and reversely analyzing to obtain the elastic modulus/>, of the top-level excavation corresponding parameter change region 4 after the error meets the accuracy requirement of the neural networkCohesive force/>Internal friction angle/>Second-stage excavation elastic modulus/>, of corresponding parameter variation region 5Cohesive force/>Internal friction angle/>And the third-stage excavation corresponds to the elastic modulus/>, of the parameter change region 6Cohesive forceInternal friction angle/>The inversion results are shown in table 11.
Table 11 shows the results of the parametric inversion (end of third-stage excavation of side slope) under the measured displacement values
Step 16, performing positive analysis and calculation on the inversion result obtained in the step 15 to obtain a displacement increment value calculated by the corresponding displacement meter monitoring point under the inversion parameterTime period)/>、/>、/>、……、/>、、/>The comparison result of the calculated value and the monitored value is shown in table 12; table 12 shows that the displacement value calculated by using the inversion parameters and the actual monitoring value have an error of less than 10%, so that the engineering requirements are met, and the inversion parameters can reflect the actual condition of the slope after the third-stage excavation is completed.
Table 12 shows the comparison between the calculated value and the actual monitored value (end of third-stage excavation of side slope)
Step 17, after the third-stage excavation of the side slope is finished, burying a sixth displacement monitoring instrument 15 on the third-stage excavation surface 16 in the horizontal direction, wherein 2 sets of displacement meters are used in total, the burying modes are the same as above, and the 2 sets of instruments are numbered、/>. As the side slope enters the service period, the monitoring displacement values of all monitoring points tend to be stable along with the time change, the mechanical parameters of the top-level excavation corresponding parameter change area 4, the second-level excavation corresponding parameter change area 5 and the third-level excavation corresponding parameter change area 6 gradually converge, and the moment is recorded as/>; Selecting instrument/>, in model section、/>、/>、/>、/>、/>、/>、/>、/>、/>Monitoring points at 40 total in period/>Measured actual displacement increment value/>、/>、/>、……、/>、/>、/>Inversion ofMoment top-level excavation corresponding parameter change area 4, second-level excavation corresponding parameter change area 5 and third-level excavation corresponding parameter change area 6/>、/>、/>、/>、/>、/>、/>、/>、/>The method steps are the same as the above.
Step 18, compared with the excavation of each stage in the construction period, the slope displacement field and the stress field are in the continuous adjustment process,The monitoring displacement values of all monitoring points at the moment tend to be stable, and the dynamic adjustment of the whole slope displacement field and the stress field is finished at the moment, and the method is carried out in the step 17/>Elastic modulus/>, of each parameter change region of time reversal、/>、/>Cohesive force/>、、/>Internal friction angle/>、/>、/>The size approaches and tends to be a fixed value/>、/>、/>And taking the fixed value as a parameter index after the whole parameter change area is adjusted, wherein the index provides a basis for the safety evaluation of the whole slope stability. In the embodiment, the side slope is excavated in three stages, and the dynamic inversion result of the excavation full-period mechanical parameters is shown in table 13. />, after finishing adjustment by using integral parameter change area、/>、/>Stability calculations were performed.
Table 13 dynamic inversion result of slope excavation full-period mechanical parameters
The invention considers the defect of record missing caused by delayed embedding time of the displacement monitoring instrument in the construction period of the deformation of each grade of slope in the excavation, captures the deformation information caused by the excavation of the corresponding slope by embedding the monitoring instrument before the excavation, and enables inversion of the mechanical parameters of rock-soil body change near the excavation surface caused by the excavation to be possible.
Compared with the current engineering selection accumulated displacement metering inversion parameter, the invention provides inversion by utilizing the increment value of the displacement information recorded in each grade of slope excavation period, solves the problem of different monitoring time scales caused by the embedding sequence of each monitoring instrument, and enables the inversion result to be closer to the real condition of the slope.
According to the invention, the engineering geological survey data and the slope excavation surfaces are comprehensively considered to divide the mechanical parameter influence areas corresponding to the slope excavation processes of each level, along with the slope excavation from top to bottom in a grading manner, monitoring instruments are reasonably arranged on each excavation surface in sequence to record the deformation influence of the subsequent excavation on the excavated area, and the dynamic inversion of the mechanical parameters of the slope excavation whole period in the construction period is realized by combining the pre-buried monitoring instruments and a displacement increment value inversion method.
The present application is not limited to the above embodiments, but is not limited to the above embodiments, and any person skilled in the art will have obvious modifications and modifications equivalent to those of the equivalent embodiments, and can make various changes and modifications without departing from the scope of the present application.
Claims (7)
1. The utility model provides a slope excavation full period mechanical parameter dynamic inversion method based on monitoring displacement which is characterized in that the method comprises the following steps:
Step 1, acquiring a parameter change area influenced by each level of excavation of a side slope;
step 2, carrying out mechanical parameter inversion according to displacement increment values at a plurality of vertically arranged monitoring points in the top-level excavation corresponding parameter change area to obtain mechanical parameters of the top-level excavation corresponding parameter change area;
the method for determining the displacement increment values at a plurality of monitoring points vertically arranged in the corresponding parameter change area of the top excavation comprises the following steps:
According to the two slope section models before and after top excavation and the mechanical parameter uniform design table of the corresponding parameter change area of the top excavation, determining deformation displacement values of the vertically arranged monitoring points when the top excavation is finished;
determining deformation displacement values of the plurality of vertically arranged monitoring points when the slope is not excavated according to initial mechanical parameters of the slope before excavation;
determining displacement increment values at a plurality of vertically arranged monitoring points according to the difference value between the deformation displacement value at the end of top-level excavation and the deformation displacement value at the time of non-excavation;
And step 3, excavating the side slope step by step downwards from the top level, and carrying out mechanical parameter inversion according to the displacement increment value of the parameter change area corresponding to the current excavation level and the displacement increment values of the parameter change areas corresponding to all levels above the current excavation level, so as to finally obtain the mechanical parameters of the parameter change area corresponding to each subsequent excavation level.
2. The dynamic inversion method of the full-period mechanical parameters of the slope excavation based on the monitoring displacement according to claim 1, wherein the mechanical parameters in the mechanical parameter uniform design table comprise elastic modulus, cohesive force and internal friction angle.
3. The dynamic inversion method of the full-period mechanical parameter of the slope excavation based on the monitoring displacement according to claim 1, wherein the dynamic parameter inversion is performed according to the displacement increment values of a plurality of monitoring points vertically arranged in a corresponding parameter change area of the top excavation, so as to obtain the mechanical parameter of the corresponding parameter change area of the top excavation, and the method specifically comprises the following steps:
Utilizing the displacement increment values and the mechanical parameters of a plurality of monitoring points vertically arranged in a corresponding parameter change area of top excavation to train a mechanical parameter inversion model;
Inputting the actual displacement increment value of the parameter change area corresponding to the top-level excavation into the trained mechanical parameter inversion model to obtain the mechanical parameter of the parameter change area corresponding to the top-level excavation.
4. The method for dynamically inverting the full-period mechanical parameters of the slope excavation based on the monitored displacement according to claim 3, further comprising, after obtaining the mechanical parameters of the top-level excavation corresponding parameter variation region:
determining and calculating a displacement increment value by utilizing the mechanical parameters of the top-level excavation corresponding parameter change area;
And determining whether the mechanical parameters of the parameter change area corresponding to the top excavation can reflect the real situation after the side slope top excavation according to the calculated displacement increment value and the actual displacement increment value of the parameter change area corresponding to the top excavation.
5. The method for dynamic inversion of full-period mechanical parameters of slope excavation based on displacement monitoring according to claim 1, wherein the step 3 specifically comprises:
Step 3.1, excavating the side slope step by step downwards from the top level, and obtaining displacement increment values at a plurality of monitoring points vertically arranged in a parameter change area corresponding to the current excavation level and displacement increment values at a plurality of monitoring points vertically and horizontally arranged in the parameter change area corresponding to all levels above the current excavation level;
And 3.2, carrying out mechanical parameter inversion according to the displacement increment value obtained in the step 3.1, and finally obtaining the mechanical parameters of the corresponding parameter change area of each subsequent excavation stage.
6. The method for dynamically inverting the full-period mechanical parameters of slope excavation based on displacement monitoring according to claim 1, further comprising, after step 3:
and carrying out mechanical parameter inversion on the displacement increment values of all the parameter change areas from the end of the final-stage excavation to the preset moment, and obtaining the parameter index after the adjustment of the whole parameter area.
7. The method for dynamically inverting the full-period mechanical parameters of the slope excavation based on the monitored displacement according to claim 6, wherein the displacement increment value of the parameter change area corresponding to the excavation of the last stage is the displacement increment value of a plurality of monitoring points vertically and horizontally arranged in the parameter change area.
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