CN110765614A - Slope risk comprehensive assessment method based on landslide damage form - Google Patents

Slope risk comprehensive assessment method based on landslide damage form Download PDF

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CN110765614A
CN110765614A CN201911017587.6A CN201911017587A CN110765614A CN 110765614 A CN110765614 A CN 110765614A CN 201911017587 A CN201911017587 A CN 201911017587A CN 110765614 A CN110765614 A CN 110765614A
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李亮
翟明
刘旭
胡振辉
王上上
陈富
陈秋汝
袁长丰
张宏斌
刘涛
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Qingdao University of Technology
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Abstract

The invention belongs to the field of slope stability and risk assessment, and particularly relates to a slope risk comprehensive assessment method based on a landslide failure form, which comprises the steps of according to cohesive force c and an internal friction angleRandomly generating n groups of combination values which accord with the statistical characteristics and recording the combination values as
Figure DDA0002246172540000012
For the ith group of combination values, obtaining the minimum slopeFactor of safety Fsi(ii) a Analysis of slide-out distance d of slope under group i of combined values Using smooth particle hydrodynamics methodRiAnd influence distance dIi(ii) a Repeating the previous two steps to obtain the minimum safety factor, the sliding-out distance and the influence distance of the side slope under all the combination values; carrying out averaging treatment to obtain an average safety coefficient, a slipping-out and an influence distance; and calculating the normalized sliding-out distance and influence distance according to the positions of the structures at the top and the bottom of the slope, and comprehensively evaluating the risk of landslide together with the average safety factor. The method introduces a smooth particle fluid dynamics method, utilizes the slip-out distance and the influence distance, and combines a classical limit balance method to more intuitively and reasonably evaluate the slope stability and the risk.

Description

Slope risk comprehensive assessment method based on landslide damage form
Technical Field
The invention belongs to the field of slope stability and risk assessment, and particularly relates to a slope risk comprehensive assessment method based on a landslide damage form.
Background
The current main method for slope stability analysis is still a limit balance method, which is to calculate a critical sliding surface and a minimum safety factor when a slope starts to slide based on static balance conditions. For the quantitative evaluation of the risk of landslide, attention should be paid to the sliding process of slope collapse and the final soil body deposition stage, and the process analysis limit balance method of landslide cannot be realized.
The slope risk assessment index based on the limit balance method mainly takes the earth volume of a landslide as a main index, and for some slopes with complex failure modes, the calculated earth volume is inaccurate, and the actual significance of the earth volume index is not great.
Disclosure of Invention
According to the defects of the prior art, the invention provides a slope risk comprehensive assessment method based on a landslide failure form, which introduces a smooth particle fluid dynamics method, and more intuitively and reasonably assesses slope stability and risk by utilizing a sliding-out distance and an influence distance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a slope risk comprehensive assessment method based on a landslide damage form comprises the following steps:
step 1, the parameter uncertainty factors which have larger influence on the slope stability analysis are the cohesive force c and the internal friction angle of the soil bodyAccording to cohesive force c and internal friction angleSuch as mean, standard deviation and distribution, using MATLAB software to randomly generate c and
Figure BDA0002246172520000013
the n groups of combined values meeting the statistical characteristics are recorded as
Figure BDA0002246172520000014
n is a positive integer, ci、
Figure BDA0002246172520000015
Is the ith combination value, wherein i is more than or equal to 1 and less than or equal to n, and i is a positive integer;
step 2, for the ith group of combination values, performing calculation analysis by using an M-P method in a GeoStadio software SLOPE/W plate to obtain the minimum safety factor Fs of the side SLOPE under the ith group of combination valuesi；
Step 3, calculating and analyzing the displacement field of the slope by using a smooth particle fluid dynamics method for the ith group of combination values to obtain the soil mass accumulation form after the slope slides out, thereby obtaining the slide-out of the slopeDistance dRiAnd influence distance dIi(ii) a The smooth particle fluid dynamics method can simulate the large deformation of the whole landslide process;
step 4, making i equal to i +1 and i equal to or more than 1 and equal to or less than n, repeating the steps 2-3 to obtain the minimum safety factor of the slope under all combination values in the step 1And the slide-out distance of the side slope under all the combined values
Figure BDA0002246172520000022
And influence distance
Figure BDA0002246172520000023
Step 5, performing minimum safety factor Fs and slide-out distance d on the three indexesRAnd influence distance dIAveraging to obtain average safety factor FsmAverage slip-out distance dRmAnd average influence distance dIm；
Step 6, calculating the normalized sliding-out distance d according to the positions of the structures at the top and the bottom of the slopeRmAnd normalized influence distance dImAnd an average factor of safety FsmComprehensively evaluating the landslide risk together; the risk assessment of the side slope can be performed more intuitively by utilizing the sliding-out distance and the influence distance.
Further, the averaging process in step 5 is implemented as follows: average safety factor ofAverage slip-out distance of
Figure BDA0002246172520000025
Average influence distance of
Figure BDA0002246172520000026
Further, the normalization process in step 6 specifically includes: assuming that the distance between the slope bottom structure and the slope toe is L1Top of slopeThe distance between the structure and the slope shoulder is L2Normalized roll-off distance
Figure BDA0002246172520000027
Normalized influence distance
Figure BDA0002246172520000028
Further, in step 6, the specific process of assessing the risk of the slope is as follows: the average factor of safety FsmThe larger the slope is, the safer the slope is, and the smaller the risk is; normalized roll-out distance dRmAnd normalized influence distance dImThe smaller the risk of a side slope is; if it slips out by a distance dRmAnd an influence distance dImIf the value is more than 1, the risk of the side slope is unacceptable, and reinforcement treatment is needed.
The invention has the following beneficial effects: the method provided by the invention combines the minimum safety factor of a classical extreme balance method and a smooth particle fluid dynamics method capable of simulating large deformation of a landslide, provides two new evaluation indexes, namely a sliding-out distance and an influence distance, more intuitively evaluates the risk of the landslide, and abandons the earth volume index with little substantial significance in the prior art, so that the slope stability and the risk evaluation under the condition of considering the uncertainty of the parameters of the rock and soil materials are more reasonable and accurate.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention (modified, please confirm);
FIG. 2 is a schematic illustration of a slide-out distance and an impact distance index for an embodiment of the present invention;
FIG. 3 is a schematic illustration of the geometry of a side slope in an embodiment of the present invention;
FIG. 4 is a random sample scatter diagram of soil parameters according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of landslide safety according to an embodiment of the present invention;
fig. 6 is a schematic diagram of landslide hazard in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, the slope risk comprehensive assessment method based on landslide damage form includes the following steps:
step 1, the parameter uncertainty factors which have larger influence on the slope stability analysis are the cohesive force c and the internal friction angle of the soil body
Figure BDA0002246172520000031
According to cohesive force c and internal friction angle
Figure BDA0002246172520000032
Statistical characteristics of (a), such as mean, standard deviation and distribution, using MATLAB software to randomly generate cohesion c and internal friction angle
Figure BDA0002246172520000033
The n groups of combined values meeting the statistical characteristics are recorded asn is a positive integer, ci、
Figure BDA0002246172520000035
Is the ith group of combination values;
step 2, for the ith group of combination values, i is more than or equal to 1 and less than or equal to n, and i is a positive integer, performing calculation analysis by using an M-P method in a GeoStudio software SLOPE/W plate to obtain the minimum safety factor Fs of the side SLOPE under the ith group of combination valuesi；
Step 3, for the ith group of combination values, i is more than or equal to 1 and less than or equal to n, and i is a positive integer, calculating and analyzing the displacement field of the side slope by using a smooth particle fluid dynamics method to obtain the soil mass accumulation form after landslide, namely the form after the side slope collapses, thereby obtaining the slide-out distance d of the side slopeRiAnd influence distance dIi(ii) a With the improvement of the processing capability of a computer, the smooth particle fluid dynamics method is applied to slope stability analysis as a Lagrange meshless method capable of calculating large deformation, and the method can be used for slope stability analysisSo as to simulate the large deformation of the whole landslide process.
Step 4, making i equal to i +1 and i equal to or more than 1 and equal to or less than n, repeating the steps 2-3 to obtain the minimum safety factor of the slope under all combination values in the step 1
Figure BDA0002246172520000041
And the slide-out distance of the side slope under all the combined values
Figure BDA0002246172520000042
And influence distance
Figure BDA0002246172520000043
Step 5, performing minimum safety factor Fs and slide-out distance d on the three indexesRAnd influence distance dIAveraging to obtain average safety factor FsmAverage slip-out distance dRmAnd average influence distance dIm；
The averaging process is realized by the following steps: average safety factor of
Figure BDA0002246172520000044
Average slip-out distance ofAverage influence distance of
Step 6, calculating the normalized sliding-out distance d according to the positions of the structures at the top and the bottom of the slopeRmAnd normalized influence distance dImAnd an average factor of safety FsmComprehensively evaluating the landslide risk together; the risk assessment of the side slope can be performed more intuitively by utilizing the sliding-out distance and the influence distance. The normalization process specifically comprises the following steps:
assuming that the distance between the slope structure and the slope toe is L1The distance between the structure of the top of the slope and the shoulder of the slope is L2Normalized roll-off distanceNormalized influence distance
The specific process for assessing the risk of the slope is as follows: the average factor of safety FsmThe larger the slope is, the safer the slope is, and the smaller the risk is;
normalized roll-out distance dRmAnd normalized influence distance dImThe smaller the risk of a side slope is; if it slips out by a distance dRmAnd an influence distance dImIf the risk is larger than 1, the risk of the side slope cannot be accepted, and the treatment such as reinforcement is needed.
The smooth particle fluid dynamics method enables the risk assessment index of the side slope to be improved into a more visual slide-out distance and an influence distance, as shown in figure 2, so that the earth volume index with little substantial significance is abandoned, and the side slope stability and the risk assessment under the condition of considering the uncertainty of the parameters of the rock and soil materials are more reasonable by combining the minimum safety factor of the classical limit balance method.
The feasibility of the method according to the invention is illustrated below in the example of a homogeneous soil slope.
The geometric dimension of the side slope is shown in figure 3, and the soil mass gravity is gamma which is 20kN/m3Cohesion c and internal friction angle
Figure BDA0002246172520000051
Obey a normal distribution, c and
Figure BDA0002246172520000052
are 10kPa and 20 deg., respectively, and the variances are 6kPa and 10 deg., respectively, and the correlation coefficient of the two parameters is-0.5. And a resident house is arranged at the bottom of the slope and 2m away from the slope toe, and a current power transmission tower is arranged at the top of the slope and 5m away from the slope shoulder to evaluate the instability risk of the slope.
According to the method provided by the invention, firstly, 20 groups of combination values which accord with the mean value, the standard deviation and the normal distribution are generated by using the mvnrnd function in MATLAB
Figure BDA0002246172520000053
(for simplicity, only 20 sets of combination values are generated here, and more sets of combination values need to be generated for actual risk analysis), see the second and third rows of Table 1, and a scatter plot of the sample is shown in FIG. 4.
TABLE 1 soil strength parameter, Risk assessment index summary sheet
Figure BDA0002246172520000061
Note: parameter in the table, ciThe unit of (b) is in kPa,
Figure BDA0002246172520000062
has the unit of (°), dRi、dIiIs m.
Then, taking material parameters of a first group of SLOPEs in the table, calculating and analyzing by using an M-P method in a GeoStadio software SLOPE/W plate to obtain 405 slip surfaces in a sliding area, wherein the minimum safety factor is 1.413, analyzing by using a smooth particle fluid dynamics program to disperse the SLOPE problem area into 13750 particles to obtain a large deformation failure form after the SLOPE slides, and obtaining the slip-out distance d of the group of SLOPEs due to the stable SLOPER1And dI1Are both 0.
All the groups of material parameters generated in the first step are subjected to the calculation and analysis to obtain all the evaluation indexes, namely the minimum safety factor Fs1，Fs2，…，Fs20Sliding out distance dR1，dR2，…，dR20And influence distance dI1，dI2，…，dI20. Averaging the three groups of indexes to obtain an average safety factor Fsm1.2678 average slip-out distance dRm0.6193, average influence distance dIm＝1.2446。
Finally, the residential building and the power transmission tower of the current structure are combinedPosition of (d)RmAnd dImNormalizing to obtain normalized slide-out distance dRm0.3097 and normalized influence distance dIm＝0.2489。
Average minimum safety factor Fs in three final evaluation indexesmThe larger the slope, the safer the slope, the smaller the risk, the normalized slide-out distance dRmAnd an influence distance dImThe smaller the slope risk is; if normalized slip-out distance dRmAnd an influence distance dImIf the value is more than 1, the risk of the side slope is unacceptable, and reinforcement and the like are needed. The landslide safety diagram is shown in fig. 5 (d; (a)Rm＜1，d*Im< 1), a schematic diagram of the risk of landslide is shown in FIG. 6 (d;)Rm＞1，d*Im＞1)。
The above description is an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications, equivalents, and flow changes made by using the contents of the present specification and drawings, or applied directly or indirectly to other related technical fields are included in the scope of the present invention.

Claims (4)

1. A slope risk comprehensive assessment method based on a landslide damage form is characterized by comprising the following steps:
step 1, the parameter uncertainty factor which has larger influence on slope stability analysis is the cohesive force of the soil bodycAnd angle of internal friction
Figure FDA0002246172510000011
According to cohesive force c and internal friction angle
Figure FDA0002246172510000012
Randomly generating cohesive force c and internal friction angle by using MATLAB software
Figure FDA0002246172510000013
N groups of combined values meeting the statistical characteristics are marked as c1、
Figure FDA0002246172510000014
c2、
Figure FDA0002246172510000015
…，cn、
Figure FDA0002246172510000016
n is a positive integer, ci、
Figure FDA0002246172510000017
Is the ith combination value, i is more than or equal to 1 and less than or equal to n, and i is a positive integer;
step 2, for the ith group of combination values, performing calculation analysis by using an M-P method in a GeoStadio software SLOPE/W plate to obtain the minimum safety factor Fs of the side SLOPE under the ith group of combination valuesi；
Step 3, calculating and analyzing the displacement field of the slope by using a smooth particle fluid dynamics method for the ith group of combination values to obtain the soil mass accumulation form after the slope slides, thereby obtaining the slide-out distance d of the slopeRiAnd influence distance dIi；
Step 4, making i equal to i +1, and i equal to or more than 1 and equal to or less than n, repeating the steps 2-3 to obtain the minimum safety factor of the side slope under all combination values in the step 1And the slide-out distance of the side slope under all the combined values
Figure FDA0002246172510000019
And influence distance
Figure FDA00022461725100000110
Step 5, performing minimum safety factor Fs and slide-out distance d on the three indexesRAnd influence distance dIAveraging to obtain average safety factor FsmAverage slip-out distance dRmAnd average influence distance dIm；
Step 6, calculating the normalized sliding-out distance d according to the positions of the structures at the top and the bottom of the slopeRmAnd normalized influence distance dImAnd an average factor of safety FsmAnd comprehensively evaluating the landslide risk.
2. The slope risk comprehensive assessment method based on landslide damage form according to claim 1, wherein the averaging process in step 5 is implemented as follows: average safety factor of
Figure FDA00022461725100000111
Average slip-out distance of
Figure FDA00022461725100000112
Average influence distance of
3. The slope risk comprehensive assessment method based on landslide failure mode according to claim 1, wherein the normalization process in step 6 specifically comprises:
assuming that the distance between the slope bottom structure and the slope toe is L1The distance between the structure of the top of the slope and the shoulder of the slope is L2Normalized roll-off distanceNormalized influence distance
Figure FDA0002246172510000022
4. The slope risk comprehensive assessment method based on landslide damage form according to claim 1, wherein in step 6, the specific process of assessing the slope risk is as follows:
the average factor of safety FsmThe larger the slope is, the safer the slope is, and the smaller the risk is;
normalized roll-out distance dRmAnd normalized influence distance dImThe smaller the risk of a side slope is;
if it slips out by a distance dRmAnd an influence distance dImIf the value is more than 1, the risk of the side slope is unacceptable, and reinforcement treatment is needed.
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CN111985041A (en) * 2020-09-17 2020-11-24 青岛理工大学 Reinforced side slope retaining wall height determination method and reinforced side slope retaining wall
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Application publication date: 20200207