CN113640113B - Slope stability real-time assessment method - Google Patents

Slope stability real-time assessment method Download PDF

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CN113640113B
CN113640113B CN202110887591.9A CN202110887591A CN113640113B CN 113640113 B CN113640113 B CN 113640113B CN 202110887591 A CN202110887591 A CN 202110887591A CN 113640113 B CN113640113 B CN 113640113B
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slope
shear
soil
test
real
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CN113640113A (en
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陈泽钦
吴凡
杨海云
李熙
林亚涛
吴在强
王重卿
张厚瑜
关英波
陈垚
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Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
State Grid Fujian Electric Power Co Ltd
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State Grid Fujian Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0023—Bending
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23—Dune restoration or creation; Cliff stabilisation

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

The invention relates to a slope stability real-time assessment method, which comprises the following steps: s1: selecting a side slope to be evaluated; s2: performing field test and indoor test to obtain parameters required by slope stability evaluation; s3: the quantitative evaluation result of the slope stability is given out by calculating the real-time safety coefficient of a point in the slope soil body; the indoor test in the step 2 comprises a conventional triaxial compression test and a bending element test; according to the invention, based on the small strain theory, the shear modulus of the soil body suitable for different strain ranges is calculated, the on-site monitoring and the indoor test result are combined more reasonably, and the real-time safety coefficient of the slope can be obtained, so that the real-time evaluation of the slope stability is realized.

Description

Slope stability real-time assessment method
Technical Field
The invention relates to a slope stability real-time evaluation method, which is applied to the technical field of geotechnical engineering.
Background
As is known, slopes widely exist in nature and engineering, the stability problem is an important problem of relation ecology and folk life, the occurrence of slope instability has burstiness, and the evaluation of slope stability has hysteresis; the invention with the bulletin number of CN108595859A discloses a method for evaluating the stability of the sliding resistance of a dam slope at the turning position of a reservoir dam, which is mainly applicable to reservoir dams, and the patent takes the extension of the axis of the dam to two sides according to the curvature of a circular arc section as a sliding surface of a slope body, so that the method has certain limitation; the strain range of the soil body measured by the conventional triaxial compression test is usually more than 1%, the small strain range of the soil body is usually less than 0.1%, the shear moduli in different strain ranges have larger differences, and how to obtain the shear moduli of the soil body in different strain states and calculate the safety coefficient of the slope in each state is an important problem to be solved in slope stability analysis.
Disclosure of Invention
In order to solve the technical problems, the invention provides the slope stability real-time assessment method, which is used for calculating the soil shear modulus applicable to different strain ranges based on the small strain theory, and more reasonably combining the on-site monitoring and the indoor test results, so that the slope real-time safety coefficient can be obtained, the slope stability real-time assessment is realized, the sliding is positioned at the position with the largest inclinometry displacement, and the sliding is supported by the measured data, so that the slope stability real-time assessment method is more accurate.
The technical scheme of the invention is as follows:
a slope stability real-time assessment method comprises the following steps:
s1: selecting a side slope to be evaluated;
s2: performing field test and indoor test to obtain parameters required by slope stability evaluation;
s3: and (5) calculating a real-time safety coefficient of a point in the slope soil body to give a quantitative evaluation result of the slope stability.
Further, the indoor test in the step 2 includes a conventional triaxial compression test and a bending element test.
Further, the safety factor F in the step 3 S The calculation method of (1) is as follows:
wherein τ f The soil shear strength is the soil shear stress, and tau is the soil shear stress. Gamma ray f G for shear strain at failure f Shear modulus at failure; gamma ray t For the real-time shearing strain of the soil body of the side slope, G t For the corresponding real-time shear modulus.
Further, the shear modulus G is obtained based on a small strain theory, and the calculation method comprises the following steps:
wherein G is 0 For the small strain initial shear modulus of the soil body, a is the control parameter of the super-consolidation state variable, and gamma 0.7 The shear strain of the soil body corresponding to the time when the shear modulus of the soil body is reduced to 70% of the initial shear modulus is reduced, E is the elastic modulus of the soil body, mu is the Poisson's ratio, and gamma c Taking gamma for small strain threshold c ＝0.1％。
Further, the soil body has small strain initial shear modulus G 0 As a result of the bending element test described above,
G 0 ＝ρV s 2
wherein ρ is the saturated density of the soil body, V s In saturated soil for shear waveThe wave velocity propagating in the body is such that,where L is the shear wave propagation distance, the sample height in the bending element test, and t is the propagation time.
Further, the soil shear modulus is reduced to 70% of the initial shear modulus, and the corresponding soil shear strain gamma is obtained 0.7 The calculation method of (1) is as follows:
wherein c'Is the effective intensity index of soil body, sigma' 1 Is the vertical effective stress of soil mass, K 0 And the static side pressure coefficient, the modulus parameters E and mu are obtained by the triaxial test.
Further, the calculation method of the control parameter a of the super consolidation state variable comprises the following steps: when γ=γ c When solving the equation
Further, the method for calculating the real-time shear strain of a point in the slope soil body comprises the following steps:
wherein ω is the deep horizontal displacement of the soil body at the buried depth z of the inclinometer, z is the distance from the inclinometer pipe to the end point of one end of the buried slope, and ω=0 point is arranged at the end point of one end of the buried slope of the inclinometer pipe.
Further, the deep horizontal displacement curve is obtained by regression of discrete displacement results measured by an inclinometer, ω=f (z) 4 )。
Further, the shear strain at the time of the breakγ f Obtained by the conventional triaxial compression test.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the evaluation parameters of the slope stability are mainly obtained through on-site monitoring, and the slope safety coefficient is calculated through on-site deep horizontal displacement monitoring data, so that the real situation of the on-site slope can be intuitively reflected;
(2) According to the invention, by introducing a small strain theory, the shear stress of soil bodies in different strain states is calculated more accurately, and the safety coefficient of the side slope in different states can be calculated to obtain the stability of the side slope in different states, so that the real-time evaluation of the side slope stability is realized, and the engineering application value is good;
(3) The slope stability is evaluated by using the slope safety coefficient Fs, so that the method has wide acceptance. The grade division of the slope safety coefficient is combined with industry standards and standards, and the method can be widely applied;
(4) The parameter acquisition method and means are simple and convenient, and the operation is easy, and the engineering application is convenient. The part of parameters provide a plurality of selectable acquisition methods and means, and the flexibility of the method application is increased on the basis of ensuring the repeatability of the method.
Drawings
FIG. 1 is a flow chart of an evaluation method of the present invention;
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
Referring to fig. 1, a method for evaluating slope stability in real time includes the steps of:
s1: selecting a side slope to be evaluated;
s2: performing field test and indoor test to obtain parameters required by slope stability evaluation;
the main content of the field test is that a slope measuring instrument is buried at the slope top and the slope toe, the deep horizontal displacement omega of the soil body at the corresponding position is obtained, and the real-time shearing strain of a point in the slope soil body is calculated:
wherein ω is the deep horizontal displacement of the soil body at the buried depth z of the inclinometer, and z is the penetration depth of the inclinometer.
The indoor test comprises a conventional triaxial test and a bending element test, and the initial shear modulus of the slope soil body is obtained through the bending element test
G 0 ＝ρV s 2
Wherein ρ is the saturated density of the soil body, V s For the wave velocity at which shear waves propagate in a saturated soil mass,where L is the shear wave propagation distance, the sample height in the bending element test, and t is the propagation time.
Obtaining the elastic modulus E, poisson's ratio mu, effective cohesive force c' and effective internal friction angle of soil body through conventional triaxial testSoil body vertical effective stress sigma' 1 Coefficient of static side pressure K 0 。
S3: and (5) calculating a real-time safety coefficient of a point in the slope soil body to give a quantitative evaluation result of the slope stability.
The safety factor F S The calculation method comprises the following steps:
wherein τ f The soil shear strength is the soil shear stress, and tau is the soil shear stress. Gamma ray f G for shear strain at failure f Shear modulus at failure; gamma ray t For the real-time shearing strain of the soil body of the side slope, G t For the corresponding real-time shear modulus.
The shear modulus G is obtained based on a small strain theory, and the calculation method comprises the following steps:
wherein a is a control parameter of the super-consolidation state variable, and gamma c Taking gamma for small strain threshold c ＝0.1％，γ 0.7 The shear strain of the soil body corresponding to the reduction of the shear modulus of the soil body to 70% of the initial shear modulus is calculated according to the following formula:
the calculation method of the control parameter a of the super-consolidation state variable comprises the following steps: when γ=γ c When solving the equation
Taking the evaluation of the slope stability of a certain power transmission and transformation project as an example, the slope stability is evaluated in real time by applying the slope stability implementation evaluation method provided by the invention.
(1) The results of the on-site deep horizontal displacement measurement of the selected side slope are shown in Table 1
Fitting to obtain a slope toe inclinometry function:
ω＝4.7454*10^(-8)*z^4-1.1933*10^(-6)*z^3+9.3141*10^(-6)*z^2-4.0958*10^(-5)*z+2.1273*10^(-4)；
real-time shear strain:
maximum shear strain is obtained: gamma ray tmax =0.05% < 0.1%, belonging to the small strain range.
Table 1 shows the measurement results of deep horizontal displacement at the toe
Depth z/m of measuring point Slope toe inclinometry/m
1 0.00023
4 0.00014
5 0.00010
6 0.00013
7 0.00008
8 0.00005
9 0.00006
10 0.00002
11 -0.00001
12 -0.00005
13 0.00003
14 0.00000
(2) By bending element test, small strain shear modulus of side slope soil body
(3) By a conventional triaxial compression test, the elastic modulus E=5.3 MPa, the Poisson ratio mu=0.35, the effective cohesion c' =23 kPa and the effective internal friction angleSoil body vertical effective stress sigma' 1 =100 kPa, resting side pressure coefficient K 0 Shear strength τ =0.69 f ＝42kPa。
Super-consolidation state variable control parameter a=0.195
Is available on the whole, soil shear modulus
Let γ=γ tmax =0.05% of the belt to obtain the shear modulus G of the side slope t ＝32.2MPa。
Real-time safety coefficient of side slope
According to the method, the on-site monitored horizontal displacement value is substituted into the slope safety coefficient formula for calculation, and according to the calculation method provided by the invention, the anti-slip stable safety coefficient of a point in the slope can be conveniently calculated, the calculation process is simple, and the result is accurate.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (1)

1. A slope stability real-time assessment method is characterized in that: the method comprises the following steps:
s1: selecting a side slope to be evaluated;
s2: performing field test and indoor test to obtain parameters required by slope stability evaluation;
s3: the quantitative evaluation result of the slope stability is given out by calculating the real-time safety coefficient of a point in the slope soil body;
the indoor test comprises a conventional triaxial compression test and a bending element test; in the field test, slope measuring instruments are buried at the tops and the bottoms of the slopes;
the safety coefficientThe calculation method of (1) is as follows:
wherein,for soil shear strength->Is the shear stress of soil mass>For shear strain at break, +.>Shear modulus at failure; />For slope soil mass real-time shear strain +.>Is the corresponding real-time shear modulus;
shear modulusGBased on the small strain theory, the calculation method comprises the following steps:
wherein,for soil shear strain->For the small strain initial shear modulus of soil mass, +.>Is a control parameter for the super-consolidation state variable,for the corresponding soil shear strain when the soil shear modulus is reduced to 70% of the initial shear modulus, ++>Is the elastic modulus of the soil body,poisson's ratio->For small strain threshold, get +.>；
The soil body small strain initial shear modulusAs a result of the bending element test described above,
wherein the method comprises the steps ofIs the saturation density of soil mass->For the wave speed of the shear wave propagating in the saturated soil, < +.>Wherein L is the propagation distance of shear waves, the height of a sample in a bending element test, and t is the propagation time;
the soil shear modulus is reduced to 70% of the initial shear modulusThe calculation method of (1) is as follows:
wherein,、/>is an effective intensity index of soil mass>Is the vertical effective stress of soil body>Elastic modulus +.>Poisson's ratio->Are obtained by the conventional triaxial compression test;
the control parameter of the super-consolidation state variableThe calculation method of (1) is as follows: when->When solving the equation
The method for calculating the real-time shear strain of one point in the slope soil body comprises the following steps:
wherein,for the deep horizontal displacement of the soil body at the buried depth z of the inclinometer, z is the distance from the inclinometer pipe to the end point of one end of the buried slope body, the end point of one end of the buried slope body of the inclinometer pipe is +.>=0;
the deep horizontal displacement curve is obtained by regression of discrete displacement results measured by an inclinometer:；
shear strain at breakObtained by the conventional triaxial compression test.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105133667A (en) * 2015-07-29 2015-12-09 同济大学 Spatiotemporal dynamic evaluation method for soil slope safety state under rainfall condition
CN106295017A (en) * 2016-08-15 2017-01-04 河海大学 A kind of excavation soil body method for analyzing stability with deflection as INSTABILITY CRITERION
CN106503354A (en) * 2016-11-01 2017-03-15 中国科学院、水利部成都山地灾害与环境研究所 A kind of unsaturation soil property stable slope computed improved method
CN109408944A (en) * 2018-10-19 2019-03-01 河海大学 Expansive soil slope failure by leaking method for analyzing stability based on complete softening intensity
CN110333336A (en) * 2019-07-05 2019-10-15 东北大学 Soil slope failure early warning system and method are monitored under a kind of condition of raining
CN111105600A (en) * 2019-12-30 2020-05-05 中国公路工程咨询集团有限公司 Cutting slope stability dynamic monitoring and early warning system and method based on rainfall condition
CN112834319A (en) * 2021-01-25 2021-05-25 中国科学院武汉岩土力学研究所 Method for determining mechanical parameters of soft soil small strain hardening model
CN113177344A (en) * 2021-05-27 2021-07-27 同济大学 Slope stability numerical simulation method based on rainfall infiltration

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Publication number Priority date Publication date Assignee Title
CN105133667A (en) * 2015-07-29 2015-12-09 同济大学 Spatiotemporal dynamic evaluation method for soil slope safety state under rainfall condition
CN106295017A (en) * 2016-08-15 2017-01-04 河海大学 A kind of excavation soil body method for analyzing stability with deflection as INSTABILITY CRITERION
CN106503354A (en) * 2016-11-01 2017-03-15 中国科学院、水利部成都山地灾害与环境研究所 A kind of unsaturation soil property stable slope computed improved method
CN109408944A (en) * 2018-10-19 2019-03-01 河海大学 Expansive soil slope failure by leaking method for analyzing stability based on complete softening intensity
CN110333336A (en) * 2019-07-05 2019-10-15 东北大学 Soil slope failure early warning system and method are monitored under a kind of condition of raining
CN111105600A (en) * 2019-12-30 2020-05-05 中国公路工程咨询集团有限公司 Cutting slope stability dynamic monitoring and early warning system and method based on rainfall condition
CN112834319A (en) * 2021-01-25 2021-05-25 中国科学院武汉岩土力学研究所 Method for determining mechanical parameters of soft soil small strain hardening model
CN113177344A (en) * 2021-05-27 2021-07-27 同济大学 Slope stability numerical simulation method based on rainfall infiltration

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