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Jointed rock slope reliability analysis lower-bound method

A jointed rock and reliability technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effects of fast calculation speed, simple calculation program, and high precision

Active Publication Date: 2018-06-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been many research results on the deterministic analysis of rock slopes using the lower limit method, but there are still very few research results on the reliability analysis of rock slopes using the lower limit method

Method used

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  • Jointed rock slope reliability analysis lower-bound method
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  • Jointed rock slope reliability analysis lower-bound method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: as Figure 1-13 As shown, a lower limit method for reliability analysis of jointed rock slopes, the specific method steps are as follows:

[0046] (1) Basic information for drafting jointed rock slopes

[0047] Embodiment 1 is a rock slope containing a group of weak structural planes, and its structure is as follows Figure 4 As shown, the main calculation parameters are as follows: Geometric parameters of jointed rock slope: height 55.94m, top width 36.6m, free surface angle 45 degrees; the bulk density of the complete rock mass is set to a fixed value of 25kN / m 3 ; The inclination angle of the structural plane (joint plane) AC is 30 degrees; the slope is only affected by the self-weight load of the rock mass.

[0048] (2) Generate the Monte Carlo random numbers of the shear parameters of the structural surface

[0049] The mean value of the cohesion force of the structural plane AC is taken as μ c =100kPa, coefficient of variation δ c Take 0.10, 0.1...

Embodiment 2

[0061] Embodiment 2: A lower limit method for reliability analysis of jointed rock slopes, the specific steps of the method are as follows:

[0062] (1) Basic information for drafting jointed rock slopes

[0063] Example 2 is a rock slope containing two groups of joints, and its geometric information is as follows Figure 9 As shown, the main calculation parameters are as follows: Geometric parameters of jointed rock slope: height 30m, top width 45m, free surface angle 80 degrees; bulk density of complete rock mass is set to a fixed value and 27kN / m 3 , the distance between the two groups of structural surfaces (joint surfaces) is 6m, and the inclination angles of the two groups of structural surfaces are 25 degrees and 80 degrees respectively; the slope is only affected by the self-weight load of the rock mass.

[0064] (2) Generate the Monte Carlo random numbers of the shear parameters of the structural surface

[0065] Example 2: The mean value of the cohesion of all stru...

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Abstract

The invention discloses a jointed rock slope reliability analysis lower-bound method. The method comprises the steps that 1, basic information of a jointed rock slope is decided according to the actual condition of the jointed rock slope; 2, a Monte Carlo random number of anti-shear parameters of a structural surface is generated; 3, a lower-bound method stochastic programming model for solving the reliability of the jointed rock slope is established; 4, a value of jointed rock slope reliability calculation through the lower-bound method stochastic programming model is solved, and a limit state function of the jointed rock slope is obtained; and 5, the reliability of the jointed rock slope is calculated according to the result in the step 4. According to the method, the Monte Carlo methodis adopted to solve the stochastic programming problem, and the method has the advantages of high precision, high calculation speed, etc.; and a simplex method is adopted to solve the linear programming problem, so that calculation program writing is easy.

Description

technical field [0001] The invention relates to a lower limit method for reliability analysis of jointed rock slopes, and belongs to the technical field of reliability analysis of rock slope engineering. Background technique [0002] The slope stability analysis of jointed rock slopes has always been a research hotspot in the field of geotechnical engineering. Generally, the slope safety is predicted by solving the safety factor or ultimate load of the slope. Slope stability analysis methods can generally be divided into deterministic analysis methods and non-deterministic analysis methods. The former uses definite values ​​for all parameters for calculation, while the latter uses certain calculation parameters as random variables for calculation and analysis. As we all know, many calculation parameters of rock slopes are uncertain, that is, any property of the actual engineering slope has no unique certainty, such as rock mass bulk density, joint distribution, and shear res...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F2119/06G06F30/20
Inventor 张小艳张立翔李泽
Owner KUNMING UNIV OF SCI & TECH
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