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Group tensile force action spherical crown type slope stability evaluation method based on Janbu method

An evaluation method and stability technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve reasonable calculation results and simple calculation process

Inactive Publication Date: 2019-09-20
ZHENGYE ENG & INVESTMENT INC +1
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Problems solved by technology

[0004] In view of the above problems, the technical problem to be solved in the present invention is to provide a method for evaluating the stability of spherical crown slopes with group tension based on the Janbu method, so as to solve the problem of the existing two-dimensional limit equilibrium method in evaluating the three-dimensional spherical crown slope with group tension. lack of stability

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  • Group tensile force action spherical crown type slope stability evaluation method based on Janbu method
  • Group tensile force action spherical crown type slope stability evaluation method based on Janbu method
  • Group tensile force action spherical crown type slope stability evaluation method based on Janbu method

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[0058] Example: Step 1: Calculation parameters of the three-dimensional model of the spherical crown slope under group tension Figure 5 As shown, it is divided into 10 annular bars, and the sliding mass density of all annular bars is 25kN / m 3 . Sliding surface cohesion c of all annular bars 1i Both are 33kPa, internal friction angle are all 35°; the sliding body cohesion c of all annular bars 2i The same is 33kPa, the internal friction angle The same is 35°. Gravity W of 10 ring bars i and the sliding surface area A 1i , as shown in Table 1; the horizontal and vertical components of each tensile force of each annular bar are 50kN, and the sum of all the tensile forces of each annular bar on the horizontal plane is F xi and the sum of the vertical component force F yi As shown in table 2.

[0059] Table 1 Gravity W of ring bar i and the sliding surface area A 1i

[0060] bar number 1 2 3 4 5 W i (kN)

15117.5 34959 59216.75 93444.5 128...

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Abstract

The invention discloses a group tensile force action spherical crown type slope stability evaluation method based on Janbu method. The method comprises the following steps: dividing a spherical crown type slope into a plurality of annular strip blocks, and obtaining the gravity Wi and the sliding surface area A1i of each annular strip block; stretching the spherical crown type slope in any direction in the symmetry axis direction to form a section, each annular strip block forming a section on the section, and obtaining the section area A2i and the sliding face inclination angle [theta]i of each annular strip block on the section; iteratively calculating the slope safety factor Fs through the following formula; introducing new assumptions into the Janbu method to improve the arch effect of the spherical crown type side slope; meanwhile, adding the group tensile force into the formula. The improved Janbu method can be used for evaluating the stability of the group tensile force acting spherical crown type side slope, the calculation process is simple, and a method with a more reasonable calculation result is provided for the stability evaluation of the group tensile force acting spherical crown type side slope.

Description

technical field [0001] The invention relates to a slope stability evaluation method, in particular to a spherical crown type slope stability evaluation method based on the Janbu method. Background technique [0002] In mountain engineering construction and landslide disaster prediction and analysis, slopes of various shapes will be encountered. For example, the shape of the slope in the horizontal plane can be divided into convex, concave and linear. The spatial shape of the slope It will undoubtedly affect its stability. Strictly speaking, slope stability analysis is a spatial problem, and the three-dimensional analysis method is more in line with the actual situation. In engineering, the evaluation of slope stability generally adopts the two-dimensional limit equilibrium method. This method is suitable for linear slope calculations. The accuracy is acceptable, but the calculation results of spherical crown slopes with significant spatial effects will be too conservative, ...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/06G06F30/20
Inventor 沈志平宋二祥徐明陈德茂朱军付君宜
Owner ZHENGYE ENG & INVESTMENT INC
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