CN111666704A - Construction method for optimizing grooving and rock-entering of underground diaphragm wall - Google Patents
Construction method for optimizing grooving and rock-entering of underground diaphragm wall Download PDFInfo
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Abstract
The invention discloses a construction method for optimizing underground continuous wall grooving rock-entering, which comprises the steps of establishing a stratum three-dimensional model according to geological survey data, establishing an L-shaped grooving simulation area on the stratum three-dimensional model, then determining the safety level of the deformation amount of the optimized grooving construction process in a finite element analysis mode, meanwhile, aiming at the grooving machines suitable under the optimized grooving construction process, the efficiency grade and the cost grade of the corresponding grooving machines are analyzed, the optimal grooving construction process and the stable energy efficiency of the grooving machine are calculated by assigning values to the deformation safety level, the efficiency level and the cost level, the optimal combination of the grooving construction process and the grooving machine can be scientifically and effectively carried out by stabilizing the energy efficiency, and then effectively improve the efficiency of grooving construction under the prerequisite of the security of effectively guaranteeing the grooving construction, effectively control the cost of grooving construction simultaneously.
Description
Technical Field
The invention belongs to the technical field of underground continuous wall construction, and particularly relates to a construction method for optimizing grooving and rock entering of an underground continuous wall.
Background
The grooving construction technology of the underground diaphragm wall tends to be mature in a soft soil stratum, but the grooving of the underground diaphragm wall by excavation under the condition of a complex stratum is difficult, particularly in the case of deep foundation pit engineering with a relatively tight construction period, the conventional grooving scheme of the underground diaphragm wall cannot meet the requirement of the construction period and has relatively poor economy. Therefore, the combination construction is usually selected as a grooving scheme, and different combination construction processes can be applicable to the characteristics of most of complex stratums and are gradually applied to the grooving construction of underground continuous walls. However, for trenching construction in different stratums, particularly for continuous wall trenching construction under complex geological conditions, the method has the defects of complex geological conditions, difficult construction, long trenching construction time, easy collapse of the walls of opposite corners and the like. Therefore, aiming at complex stratum conditions, how to select the optimized grooving construction process for combination is an urgent problem to be solved in the grooving combination construction process, and therefore the invention discloses a construction method for optimizing grooving rock-entering of an underground diaphragm wall.
Disclosure of Invention
The invention aims to provide a construction method for optimizing grooving rock-entering of an underground continuous wall, which is used for analyzing a grooving construction process and corresponding grooving machines according to different stratum conditions to determine the deformation safety level, the efficiency level and the cost level of the corresponding grooving construction process and the corresponding grooving machines for construction on the current stratum, comprehensively calculating the stable energy efficiency of the corresponding grooving construction process and the corresponding grooving machines according to the deformation safety level, the efficiency level and the cost level, and objectively and scientifically selecting the grooving construction process and the grooving machines which are most suitable for the current stratum according to the stable energy efficiency so as to realize the optimized combination of different grooving construction processes and the grooving machines for different stratums.
The invention is realized by the following technical scheme:
a construction method for optimizing grooving and rock entering of an underground diaphragm wall comprises the following steps:
Step 2, establishing a three-dimensional stratum model according to stratum parameters obtained by geological survey, sequentially carrying out deformation analysis on the grooving construction process according to the applicability sequence in the step 1 by adopting finite element analysis, obtaining the deformation safety level of the current grooving construction process according to the actual deformation, and comparing the deformation safety level with a deformation safety threshold;
establishing a corresponding three-dimensional stratum model according to the soil structure, soil classification and soil thickness of the current stratum, carrying out grid division on the three-dimensional stratum model, then respectively analyzing the actual deformation of the stratum generated when various grooving construction processes are subjected to grooving construction on the current stratum according to the applicability sequence in the step 1 by adopting finite element analysis software, grading the safety level of the deformation of each grooving construction process according to the actual deformation, and indicating that the higher the safety level of the deformation is, the higher the safety of the currently selected grooving construction process is in the current stratum construction; and meanwhile, a deformation safety threshold is preset, and if the deformation safety level of the grooving construction process obtained by analysis for the current stratum is smaller than the deformation safety threshold, it is indicated that the safety risk exists when the grooving construction process for the current stratum is carried out by the current grooving construction process.
Step 3, aiming at the grooving construction process with the deformation safety level being more than or equal to the deformation safety threshold, analyzing the grooving machine which is suitable for the current stratum under the current grooving construction process, calculating the grooving efficiency and the grooving cost of the grooving machine in the current stratum, and obtaining the efficiency level and the cost level of the grooving machine in the current stratum according to the grooving efficiency and the grooving cost;
and 4, distributing weights to the deformation safety level, the efficiency level and the cost level, calculating the stable energy efficiency of the selected trenching machine aiming at the corresponding trenching construction process according to the distributed weights, wherein the higher the stable energy efficiency is, the higher the applicability of the currently selected trenching construction process and the trenching machine selected corresponding to the corresponding trenching construction process to the current stratum is.
And 5, determining the optimal grooving construction process and the corresponding grooving machine for the current stratum according to the energy efficiency, and then performing grooving construction by adopting the selected grooving machine according to the selected grooving construction process.
In order to better implement the present invention, further, the step 2 includes the following sub-steps:
step 2.1, establishing a three-dimensional stratum model according to the soil structure, the soil classification and the soil layer thickness of the stratum by using MIDASGTSNX finite element simulation software, and then carrying out grid division on the three-dimensional stratum model by using the MIDASGTSNX finite element simulation software;
and 2.2, establishing an L-shaped groove simulation area on the three-dimensional stratum model according to an L-shaped wall body which needs to be constructed actually, and establishing a first soil body influence simulation area and a second soil body influence simulation area on the end heads of two straight sections of the L-shaped groove simulation area along the direction of the straight sections respectively, wherein the first soil body influence simulation area and the second soil body influence simulation area are used for simulating the influence of excavation of the L-shaped groove simulation area on soil bodies in the soil body influence simulation area, and whether soil body collapse in the soil body influence simulation area can be caused when the L-shaped groove simulation area is excavated can be determined.
2.3, respectively forming a groove simulation area, a first soil body influence simulation area and a second soil body influence simulation area in the L direction, the horizontal direction X, the horizontal direction Y and the vertical direction Z, establishing a plurality of measuring points, and calculating the construction load and the dynamic response boundary of the groove forming construction process at the measuring points;
and 2.4, calculating the maximum deformation of the stratum of the L-shaped groove simulation area according to the construction load and the dynamic response boundary by adopting MIDASGTSNX finite element simulation software, and comparing the maximum deformation with a deformation safety level comparison table to obtain the deformation safety level of the current grooving construction process corresponding to the current stratum for grooving construction.
In order to better realize the method, further, not less than three measuring points are established in the L-shaped groove simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively, and not less than three measuring points are established in the first soil body influence simulation area and the second soil body influence simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively.
In order to better realize the invention, further, the three-dimensional stratum model is extended on the basis of actual length, width and height, and the extension range is less than or equal to 15 m; the three-dimensional stratum model is a cubic model, and in order to reduce the influence of the boundary effect, the three-dimensional stratum model needs to be extended for a certain length in three directions of length, width and height, and the extension amount does not exceed 15mm in each direction.
In order to better realize the invention, further, the first soil body influence simulation area and the second soil body influence simulation area are both common soil bodies; or the first soil body influence simulation area is a common soil body, and the second soil body influence simulation area is concrete; or the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete.
In order to better realize the method, the grooving construction process further comprises grooving of a grooving machine, percussion drilling grooving, rotary drilling grooving, blasting grooving and grooving of a groove milling machine.
In order to better implement the invention, further, if the grooving construction process is impact drilling grooving, the formula for calculating the construction load is as follows:
wherein: pmaxIs an impact load; h is the height of the rammer from the ground; h' is the depth of the rammer entering the groove pit; rhoMudThe density of the slurry in the groove pit; rhoRammerIs the ram density; m is the mass of the rammer; s is the elastic constant.
In order to better implement the invention, further, if the grooving construction process is blasting grooving, the formula for calculating the construction load is as follows:
wherein: peBlasting construction load; p0The blasting acting force on the hole wall of a single blasting hole is adopted; r is0The radius of the blast hole is; and a is the distance between blast holes.
To better implement the present invention, further, the formula for calculating the dynamic response boundary is as follows:
wherein:
α＝1；Kvthe vertical foundation reaction force coefficient; khIs a horizontal foundation reaction force coefficient; e0Is the modulus of elasticity of the foundation;
wherein:
g is shear modulus; e is the modulus of elasticity; mu is Poisson's ratio; a is the cross-sectional area; cpIs a normal viscous boundary parameter; csIs a tangential viscosity boundary parameter; ρ is the formation density.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the method, a corresponding stratum three-dimensional model is established according to geological survey data, an L-shaped groove simulation area is established on the stratum three-dimensional model, the applicability sequencing is carried out on a plurality of grooving construction processes according to stratum characteristics of the stratum three-dimensional model, MIDASGTSNX finite element simulation software is adopted to carry out simulation analysis on the deformation generated by the L-shaped groove simulation area when each grooving construction process corresponds to the current stratum and performs grooving construction, and then the safety level of the deformation when different grooving construction processes perform grooving construction on different stratums can be scientifically and effectively judged objectively through the safety level of the deformation, so that a scientific and effective judgment basis is provided for selecting different grooving construction processes for different stratums;
(2) according to the method, after the grooving construction process is optimized according to the deformation safety level, grooving machines suitable for the current grooving construction process are further selected, the grooving efficiency and the grooving cost of the selected grooving machines during grooving construction on the current stratum are analyzed, the efficiency level and the cost level of the grooving machines are further obtained, then the deformation safety level, the efficiency level and the cost level are assigned, the selected grooving construction process and the stable energy efficiency of the grooving machines are further calculated, the construction safety, the construction efficiency and the construction cost of the grooving construction process and the grooving machines are comprehensively considered, and the optimized grooving construction process and the construction machine combination suitable for the current stratum condition are optimized according to the stable energy efficiency, so that the safety of the grooving construction of the underground wall is effectively guaranteed, the construction efficiency is guaranteed, and the construction cost is effectively controlled.
Drawings
FIG. 1 is a schematic flow chart of the steps of the present invention;
FIG. 2 is a schematic illustration of a three-dimensional earth model;
FIG. 3 is a schematic diagram of the station set up in the horizontal X direction;
FIG. 4 is a schematic diagram of the stations established in the horizontal Y direction;
FIG. 5 is a schematic diagram of the stations established in the vertical Z direction;
FIG. 6 is a schematic diagram of deformation of a measuring point 1 and a measuring point 2 in the horizontal X direction, wherein the soil body influence simulation areas are all common soil bodies;
FIG. 7 is a schematic diagram of deformation of a measuring point 3 and a measuring point 4 in the horizontal X direction, wherein the soil body influence simulation area is a common soil body;
FIG. 8 is a schematic diagram of deformation of a measuring point 5 and a measuring point 6 in the horizontal X direction, wherein the soil body influence simulation areas are all common soil bodies;
FIG. 9 is a schematic diagram of horizontal X-direction deformation of common soil and concrete in a soil influence simulation area;
FIG. 10 is a schematic diagram of the horizontal X-direction deformation of concrete in a soil influence simulation area;
FIG. 11 is a schematic diagram of horizontal Y-direction deformation of a common soil body in a soil body influence simulation area;
FIG. 12 is a schematic diagram of horizontal Y-direction deformation of common soil and concrete in a soil influence simulation area;
FIG. 13 is a schematic diagram of the horizontal Y-direction deformation of concrete in the soil influence simulation area;
FIG. 14 is a schematic view of vertical Z-direction deformation of a common soil body in a soil body influence simulation area;
FIG. 15 is a schematic view of vertical Z-direction deformation of common soil and concrete in a soil influence simulation area
FIG. 16 is a schematic diagram of the vertical Z-direction deformation of concrete in a soil influence simulation area.
Detailed Description
Example 1:
the construction method for optimizing trenching rock entering of the underground diaphragm wall in the embodiment is shown in fig. 1 and comprises the following steps:
And 2, establishing a three-dimensional stratum model according to stratum parameters obtained by geological survey, sequentially carrying out deformation analysis on the grooving construction process according to the applicability sequence in the step 1 by adopting finite element analysis, and not carrying out deformation analysis on the grooving construction process which is obviously not suitable for the current stratum. For example, for a sandstone stratum with higher hardness, the sandstone stratum is difficult to mill by adopting a grooving process of a grooving machine, namely, deformation analysis does not need to be carried out on the grooving of the grooving machine for the sandstone stratum. According to the grooving construction process, comparing the actual deformation generated by grooving construction aiming at the current stratum with a deformation safety level comparison table to obtain the deformation safety level of the current grooving construction process, and comparing the deformation safety level with a deformation safety threshold value, wherein the deformation safety threshold value is regulated by the industry;
step 3, aiming at the grooving construction process with the deformation safety level being more than or equal to the deformation safety threshold, analyzing the grooving machine which is suitable for the current stratum under the current grooving construction process, calculating the grooving efficiency and the grooving cost of the grooving machine in the current stratum, and obtaining the efficiency level and the cost level of the grooving machine in the current stratum according to the grooving efficiency and the grooving cost;
if aiming at a peat soil layer, the grooving construction process with standard deformation safety level and high applicability is grooving by a grooving machine, the grooving machine applicable to the grooving process by the grooving machine is a hydraulic grooving machine, a grab bucket grooving machine and a mechanical grooving machine, and aiming at the three grooving machines, on the premise of ensuring the safety of construction deformation, the grooving efficiency and the grooving cost of the three grooving machines in grooving construction aiming at the current stratum are analyzed, and the grooving efficiency, the grooving cost and the efficiency cost level are compared with an efficiency cost level table to obtain the efficiency level and the cost level of the grooving construction of the grooving machine corresponding to the current stratum.
Step 4, distributing weights to the safety level, the efficiency level and the cost level of the deformation, wherein the distributed weights can be adjusted according to actual construction needs, and if the requirement on construction safety is high, the weights correspondingly distributed to the safety level of the deformation are the most; and calculating the stable energy efficiency of the selected trenching machine for the corresponding trenching construction process according to the distribution weight, wherein the higher the stable energy efficiency is, the higher the applicability of the currently selected trenching construction process and the trenching machine selected corresponding to the corresponding trenching construction process to the current stratum is.
And 5, selecting an optimal grooving construction process and a corresponding grooving machine for the current stratum according to the energy efficiency stability and the energy efficiency, and then performing grooving construction by adopting the selected grooving machine according to the selected grooving construction process.
Example 2:
the embodiment is further optimized on the basis of embodiment 1, and the step 2 includes the following sub-steps:
step 2.1, establishing a three-dimensional stratum model according to stratum soil property and stratum thickness by using MIDASGTSNX finite element simulation software, wherein the three-dimensional stratum model comprises a plurality of grid layers which are sequentially arranged from top to bottom, different grid layers adopt different colors or line marks, and each grid layer represents a stratum;
step 2.2, establishing an L-shaped groove simulation area on the three-dimensional stratum model according to an L-shaped wall body which needs to be constructed actually, and establishing a first soil body influence simulation area and a second soil body influence simulation area on the ends of two straight sections of the L-shaped groove simulation area along the direction of the straight sections;
2.3, respectively forming a groove simulation area, a first soil body influence simulation area and a second soil body influence simulation area in the L direction, the horizontal direction X, the horizontal direction Y and the vertical direction Z, establishing a plurality of measuring points, and calculating the construction load and the dynamic response boundary of the groove forming construction process at the measuring points; establishing an XOY plane by using a horizontal plane on which the top end surface of the L-shaped groove simulation area is located, wherein the horizontal X direction is parallel to the L to form one straight section of the groove simulation area, the horizontal Y direction is parallel to the L to form the other straight section of the groove simulation area, and the vertical Z direction is vertical to the XOY plane along the vertical direction;
and 2.4, calculating the maximum deformation of the stratum of the L-shaped groove simulation area according to the construction load and the dynamic response boundary by adopting MIDASGTSNX finite element simulation software, and then comparing the obtained maximum deformation with a deformation safety level comparison table to further obtain the deformation safety level corresponding to the corresponding maximum deformation.
In order to ensure the accuracy of analysis of the L-shaped groove simulation area, the first soil body influence simulation area and the second soil body influence simulation area, at least three measuring points established in the L-shaped groove simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction are ensured, and at least three measuring points established in the first soil body influence simulation area or the second soil body influence simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction are ensured.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in this embodiment, further optimization is performed on the basis of the foregoing embodiment 1 or 2, where the first soil influence simulation area and the second soil influence simulation area are both common soil; or the first soil body influence simulation area is a common soil body, and the second soil body influence simulation area is concrete; or the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete.
The method comprises the steps that parameters such as thickness, density and soil quality of corresponding soil bodies in a first soil body influence simulation area and a second soil body influence simulation area are input into MIDASGTSNX finite element simulation software, then influences on the first soil body influence simulation area and the second soil body influence simulation area when L-shaped groove simulation area excavation is carried out are analyzed through the MIDASGTSNX finite element simulation software, and then whether collapse or other deformation can occur in the first soil body influence simulation area and the second soil body influence simulation area when the L-shaped groove simulation area excavation is carried out is determined, and construction safety of the L-shaped groove simulation area is further improved.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
in this embodiment, further optimization is performed on the basis of any one of the embodiments 1 to 3, and in the construction processes of grooving by a grooving machine, grooving by a percussion drill, grooving by a rotary drilling drill, grooving by a blasting grooving machine and grooving by a grooving machine, because the grooving by the grooving machine and the grooving by the grooving machine generally aim at a stratum with soft soil texture, the construction load of the grooving by the grooving machine and the grooving by the grooving machine on the stratum is small; meanwhile, the drilling speed of rotary drilling for grooving is low, and the construction load on the stratum is also low, so that the construction load on the stratum is generally only considered when the grooving is formed by percussion drilling and blasting.
If the grooving construction process is percussion drilling grooving, the formula for calculating the construction load is as follows:
wherein: pmaxIs an impact load; h is the height of the rammer from the ground; h' is the depth of the rammer entering the groove pit; rhoMudThe density of the slurry in the groove pit; rhoRammerIs the ram density; m is the mass of the rammer; s is the elastic constant.
Further, if the grooving construction process is blasting grooving, the formula for calculating the construction load is as follows:
wherein: peBlasting construction load; p0The blasting acting force on the hole wall of a single blasting hole is adopted; r is0The radius of the blast hole is; and a is the distance between blast holes.
Further, the dynamic response boundary includes an elastic boundary and a viscous boundary, and the elastic boundary is calculated according to the following formula:
wherein:
α＝1；Kvthe vertical foundation reaction force coefficient; khIs a horizontal foundation reaction force coefficient; e0Is the modulus of elasticity of the foundation.
The formula for calculating the sticky boundary is as follows:
wherein:
g is shear modulus; e is the modulus of elasticity; mu is Poisson's ratio; a is the cross-sectional area; cpIs a normal viscous boundary parameter; csIs a tangential viscosity boundary parameter; ρ is the formation density.
And inputting the calculated parameters of the elastic boundary and the viscous boundary into MIDASGTSNX finite element simulation software, namely directly generating an elastic boundary unit and a viscous boundary unit, wherein the MIDASGTSNX finite element simulation software automatically generates a boundary spring according to the effective area of the elastic boundary unit and the effective area of the viscous boundary unit.
By defining the elastic boundary and the viscous boundary, the dynamic response boundary can be clearly defined, the influence of the boundary condition on the analysis result is further reduced, and the accuracy of the analysis result is improved.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
in this embodiment, a three-dimensional stratum model is created based on the stratum parameters obtained from the geological survey, as shown in fig. 2, the three-dimensional stratum model includes, from top to bottom, a peat soil layer, a silty clay layer, a silty layer, a gravel layer, and sandstone, the three-dimensional stratum model is created based on the soil parameters and the stratum thickness of each stratum, the three-dimensional stratum model is gridded by using midasgsnx finite element simulation software, a slot simulation area is created in the three-dimensional stratum model, and the three-dimensional stratum model extends to 35m long by 35m wide by 35m high by 50m in order to reduce the influence of the boundary effect. Because the sandstone with higher hardness exists in the stratum, and the hardness of the peat soil layer, the silty clay layer, the silty layer and the gravel layer on the upper part of the sandstone is lower, a grooving process by a grooving machine is adopted aiming at the peat soil layer, the silty clay layer, the silty layer and the gravel layer, and a groove forming process by an impact drilling is adopted aiming at the sandstone.
As shown in fig. 3-5, then, a plurality of measuring points are respectively established in the L-shaped trough simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction, meanwhile, a first soil influence simulation area and a second soil influence simulation area are respectively established on the end heads of the two straight sections of the L-shaped trough simulation area along the straight section direction, and a plurality of measuring points are established in the first soil influence simulation area and the second soil influence simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction.
Because the impact load of the grooving process of the grooving machine on the stratum is smaller, only the impact of the impact drilling grooving on the stratum and the soil in the first soil influence simulation area and the second soil influence simulation area is considered. Inputting construction load and dynamic response boundary for forming grooves by using impact drill in MIDASGTSNX finite element simulation software, analyzing deformation of an L-shaped groove forming simulation area in the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively, and determining the safety level of the deformation of the grooving and impact drill grooving combined process according to the deformation, wherein the analysis result is as follows:
deformation for horizontal X direction:
(1) as shown in fig. 6 to 8, the first soil body influence simulation area and the second soil body influence simulation area are both common soil bodies, the L-shaped groove forming completion stage and the impact load application stage are performed, when the time point t of the impact load is 0.32s, the displacement in the horizontal X direction reaches the maximum value, at this time, the maximum horizontal displacement at the large corner position is 2.31mm, and the maximum displacement at the small corner position is 2.39 mm; the maximum horizontal displacement at the large corner position and the maximum displacement at the small corner position of the L-shaped groove are both 1.55mm and 1.44mm, and the deformation direction of the L-shaped groove faces the inside of the L-shaped groove.
(2) As shown in fig. 9, the first soil body influence simulation area is a common soil body, the second soil body influence simulation area is concrete, and at the stage of applying an impact load, when the time point t of the impact load is 0.32s, the displacement in the horizontal X direction reaches the maximum value, at this time, the maximum horizontal displacement at the large corner position is 1.93mm, and the maximum displacement at the small corner position is 1.54 mm; and an L-shaped groove forming completion stage, wherein the maximum horizontal displacement of the large corner position and the maximum displacement of the small corner position of the L-shaped groove are respectively 1.57mm and 1.09mm, and the deformation direction of the L-shaped groove faces to the inside of the L-shaped groove.
(3) As shown in fig. 10, the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete, and in the stage of applying the impact load, when the time point t of the impact load is 0.30s, the displacement in the horizontal X direction reaches the maximum value, at this time, the maximum horizontal displacement at the large corner position is 1.76mm, and the maximum displacement at the small corner position is 1.30 mm; and an L-shaped groove forming completion stage, wherein the maximum horizontal displacement of the large corner position and the maximum displacement of the small corner position of the L-shaped groove are respectively 1.59mm and 1.09mm, and the deformation direction of the L-shaped groove faces to the inside of the L-shaped groove.
Deformation for horizontal Y direction:
(1) as shown in fig. 11, when the first soil mass influence simulation area and the second soil mass influence simulation area are both common soil masses, the L-shaped groove forming completion stage and the impact load applying stage are performed, when the time point t of the impact load is 0.26s, the displacement in the horizontal Y direction reaches the maximum value, at this time, the maximum horizontal displacement at the large corner position is 2.31mm, and the maximum displacement at the small corner position is 2.39 mm; the maximum horizontal displacement at the large corner position and the maximum displacement at the small corner position of the L-shaped groove are both 1.55mm and 1.44mm, and the deformation direction of the L-shaped groove faces the inside of the L-shaped groove.
(2) As shown in fig. 12, when the first soil body influence simulation area is a common soil body and the second soil body influence simulation area is concrete, the displacement in the horizontal Y direction reaches the maximum value when the impact load time point t is 0.26s, at this time, the maximum horizontal displacement at the large corner position is 1.93mm, and the maximum displacement at the small corner position is 1.70 mm; and an L-shaped groove finishing stage, wherein the maximum horizontal displacement of the large corner position and the maximum displacement of the small corner position of the L-shaped groove are respectively 1.56mm and 1.53mm, and the deformation direction of the L-shaped groove faces to the inside of the L-shaped groove.
(3) As shown in fig. 13, when the first soil mass influence simulation area and the second soil mass influence simulation area are both made of concrete, and at the stage of applying an impact load, when the time point t of the impact load is 0.26s, the displacement in the horizontal Y direction reaches the maximum value, at this time, the maximum horizontal displacement at the large corner position is 1.76mm, and the maximum displacement at the small corner position is 1.30 mm; and an L-shaped groove forming completion stage, wherein the maximum horizontal displacement of the large corner position and the maximum displacement of the small corner position of the L-shaped groove are respectively 1.59mm and 1.09mm, and the deformation direction of the L-shaped groove faces to the inside of the L-shaped groove.
Deformation for vertical Z direction:
(1) as shown in fig. 14, the first soil body influence simulation area and the second soil body influence simulation area are both common soil bodies, and at the impact load application stage, when the impact load time point t is 0.28s, the displacement in the vertical Z direction reaches the maximum value of 3.25mm, which is expressed as settlement deformation; l-shaped groove forming completion stage, wherein the maximum vertical Z-direction deformation of the L-shaped groove is 0.90mm, and upward bulging deformation is shown.
(2) As shown in fig. 15, the first soil body influence simulation area is a common soil body, the second soil body influence simulation area is concrete, and at the stage of applying an impact load, when the time point t of the impact load is 0.28s, the displacement in the vertical Z direction reaches the maximum value of 2.65mm, which is expressed as a settlement deformation; l-shaped groove forming completion stage, wherein the maximum vertical Z-direction deformation of the L-shaped groove is 0.85mm, and upward bulging deformation is shown.
(3) As shown in fig. 16, the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete, and at the impact load application stage, when the impact load time point t is 0.28s, the displacement in the vertical Z direction reaches the maximum value of 2.29mm, which is expressed as settlement deformation; l-shaped groove forming completion stage, wherein the maximum vertical Z-direction deformation of the L-shaped groove is 0.81mm, and upward bulging deformation is shown.
The actual deformation table shown in table 1 is obtained from the above analysis data:
TABLE 1 maximum deformation Scale
The safety threshold of the deformation amount is 2 grade, namely the safety level of the deformation amount is greater than or equal to the safety threshold of the deformation amount, the safety of the currently adopted grooving construction process is indicated, and otherwise, the safety level of the deformation amount is less than the safety threshold of the deformation amount, the safety risk of the currently adopted grooving construction process is indicated. According to the actual deformation obtained by analysis and calculation, the deformation safety grade can be obtained through a deformation safety grade comparison table shown in table 2:
TABLE 2 safety grade comparison table of deformation
Selecting a hydraulic grooving machine aiming at a grooving process of the grooving machine, selecting a rammer percussion drill aiming at a grooving process of the percussion drill, analyzing grooving efficiency and grooving cost of the hydraulic grooving machine and the rammer percussion drill, dividing the grooving efficiency into 1 grade with low efficiency, 2 grade with common efficiency and 3 grade with excellent efficiency, wherein the low efficiency corresponds to the 1 grade, namely the grooving speed is less than 3m3H, the efficiency corresponds to 2-grade is 3m3The grooving speed is less than or equal to 10m3Per, good efficiency corresponds to grade 3, namely that the groove forming speed is more than or equal to 10m3H; grooving cost is 1m per groove3The cost of (a) is quantified to obtain an efficiency cost table as shown in table 3:
TABLE 3 efficiency cost table
| Process for the preparation of a coating | Grooving machine | Efficiency of grooving | Cost of grooving (hundred yuan/m)3) |
| Grooving machine grooving and percussion drill grooving | Hydraulic trenching machine and rammer percussion drill | Low (level 1) | 3 |
Then respectively distributing weights to the actual deformation, the grooving efficiency and the grooving cost, and calculating the stable energy efficiency through the following formula:
K＝HQb+PQx+LQc；
wherein: k is stable energy efficiency; qbIs the weight of the deformation; qxIs the efficiency weight; qcIs a cost weight; h is the deformation safety level; h ═ Hx+Hy+Hz，HxSafety level for the amount of deformation in the horizontal X-direction, HySafety level for the amount of deformation in the horizontal Y direction, HzAnd the safety level of the deformation amount in the vertical Z direction is shown.
Here, the weight Q of the deformation is takenb0.7, efficiency weight Qx0.2, cost weight QcIf 0.1, then the data is taken into account to obtain:
the first soil body influence simulation area and the second soil body influence simulation area are common soil bodies:
K1＝(1+1+1)×0.7+1×0.2+3×0.1＝2.6；
the first soil body influence simulation area is a common soil body, and the second soil body influence simulation area is concrete:
K2＝(2+2+2)×0.7+1×0.2+3×0.1＝4.7；
the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete:
K3＝(3+3+2)×0.7+1×0.2+3×0.1＝6.1；
different grooving construction processes and the construction suitability of the grooving machine selected corresponding to the grooving construction process for stratums of different geologies can be scientifically and objectively quantitatively evaluated through stable energy efficiency, and the higher the stable energy efficiency is, the more suitable the grooving construction process and the grooving machine are for the current stratum construction.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A construction method for optimizing grooving and rock entering of an underground diaphragm wall is characterized by comprising the following steps:
step 1, carrying out applicability sequencing on a plurality of grooving construction processes suitable for the current stratum according to stratum parameters obtained by geological exploration;
step 2, establishing a three-dimensional stratum model according to stratum parameters obtained by geological survey, sequentially carrying out deformation analysis on the grooving construction process according to the applicability sequence in the step 1 by adopting finite element analysis, obtaining the deformation safety level of the current grooving construction process according to the actual deformation, and comparing the deformation safety level with a deformation safety threshold;
step 3, aiming at the grooving construction process with the deformation safety level being more than or equal to the deformation safety threshold, analyzing the grooving machine suitable for the current stratum under the current grooving construction process, and calculating the grooving efficiency and the grooving cost of the grooving machine in the current stratum;
step 4, distributing weights to the actual deformation, the grooving efficiency and the grooving cost, and calculating the stable energy efficiency of the grooving machine selected according to the distribution weights aiming at the corresponding grooving construction process;
and 5, determining the optimal grooving construction process and the corresponding grooving machine for the current stratum according to the energy efficiency, and then performing grooving construction by adopting the selected grooving machine according to the selected grooving construction process.
2. The construction method for optimizing the trenching rock-entering of the underground diaphragm wall as claimed in claim 1, wherein the step 2 comprises the following substeps:
step 2.1, establishing a three-dimensional stratum model according to stratum soil property and stratum thickness by using MIDASGTSNX finite element simulation software;
2.2, establishing an L-shaped groove simulation area on the three-dimensional stratum model according to an L-shaped wall body which needs to be constructed actually, and respectively establishing a first soil body influence simulation area and a second soil body influence simulation area on the end heads of two straight sections of the L-shaped groove simulation area along the direction of the straight sections;
step 2.3, establishing a plurality of measuring points in a groove simulation area and a soil body influence simulation area in the L direction along the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively, and calculating the construction load and the dynamic response boundary of the groove construction process at the measuring points;
and 2.4, calculating the maximum deformation of the stratum of the L-shaped groove simulation area by using MIDASGTSNX finite element simulation software according to the construction load and the dynamic response boundary, and determining the deformation safety level H of the corresponding grooving construction process according to the maximum deformation of the stratum and a deformation safety level comparison table.
3. The construction method for optimizing grooving rock entering of the underground diaphragm wall as claimed in claim 2, wherein not less than three measuring points are established in the L-groove forming simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively; and at least three measuring points are established in the first soil body influence simulation area or the second soil body influence simulation area along the horizontal X direction, the horizontal Y direction and the vertical Z direction respectively.
4. The construction method for optimizing trenching rock-entering of the underground diaphragm wall as claimed in claim 3, wherein the first soil influence simulation area and the second soil influence simulation area are both common soil; or the first soil body influence simulation area is a common soil body, and the second soil body influence simulation area is concrete; or the first soil body influence simulation area and the second soil body influence simulation area are both made of concrete.
5. The construction method for optimizing grooving and rock entering of the underground continuous wall according to any one of claims 1 to 4, wherein the grooving construction process comprises grooving of a grooving machine, grooving of a percussion drill, grooving of a rotary drill, grooving of a blasting grooving machine and grooving of a grooving machine.
6. The construction method for optimizing trenching rock-entering of the underground diaphragm wall as claimed in claim 5, wherein if the trenching construction process is percussion drilling trenching, the formula for calculating the construction load is as follows:
wherein: pmaxIs an impact load; h is the height of the rammer from the ground; h is the depth of the rammer entering the groove pit; rhoMudThe density of the slurry in the groove pit; rhoRammerIs the ram density; m is the mass of the rammer; s is the elastic constant.
7. The construction method for optimizing trenching rock-entering of the underground diaphragm wall as claimed in claim 5, wherein if the trenching construction process is blasting trenching, the formula for calculating the construction load is as follows:
wherein: peBlasting construction load; p0The blasting acting force on the hole wall of a single blasting hole is adopted; r is0The radius of the blast hole is; and a is the distance between blast holes.
8. The construction method for optimizing trenching rock-entering of the underground diaphragm wall as claimed in claim 2, wherein the formula for calculating the dynamic response boundary is as follows:
wherein:
α＝1；Kvthe vertical foundation reaction force coefficient; khIs waterA flat foundation reaction coefficient; e0Is the modulus of elasticity of the foundation;
wherein:
g is shear modulus; e is the modulus of elasticity; mu is Poisson's ratio; a is the cross-sectional area; cpIs a normal viscous boundary parameter; csIs the tangential viscosity boundary parameter.
9. The construction method for optimizing the trenching rock-entering of the underground diaphragm wall as claimed in any one of claims 1 to 4, wherein the three-dimensional stratum model needs to be extended on the basis of actual length, width and height, and the extending amount in each direction is less than or equal to 15 m.
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