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Slope stability limit balance calculation method based on inter-strip normal force distribution characteristics

A technology of limit balance and calculation method, which is applied in the field foundation soil survey, excavation, foundation structure engineering, etc., to achieve the effect of improving project economic benefits, improving project safety, and saving construction costs

Active Publication Date: 2019-06-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional slice method assumes that the position of the thrust action line is at the bottom of the bar, ignoring the influence of other positions on the calculation results

Method used

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  • Slope stability limit balance calculation method based on inter-strip normal force distribution characteristics
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  • Slope stability limit balance calculation method based on inter-strip normal force distribution characteristics

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Embodiment 1

[0044] Embodiment 1: A method for calculating the limit equilibrium of slope stability based on the distribution characteristics of the normal force between strips, the specific steps are as follows:

[0045](1) For a given sliding body, it is vertically divided into several bars of equal width (see figure 1 ), in the traditional limit equilibrium Spencer method, the force diagram of the i-th block in the Spencer method calculation model is shown in figure 2 , assuming that the forces between the blocks are parallel to each other, that is, θ i = θ is a constant, the resultant force △P between the bars on both sides of the bar, that is, the difference between the bars on both sides of the bar, is:

[0046]

[0047] (2) When the sliding surface is a circular-arc sliding surface, for the entire slope, the sum of the forces between each block is 0, that is:

[0048] ∑(P i+1 -P i )=0 (2)

[0049] (3) In the process of solving the bar moment balance, the resultant force △P ...

Embodiment 2

[0073] Embodiment 2: A method for calculating the limit equilibrium of slope stability based on the distribution characteristics of the normal force between strips, the specific steps are as follows:

[0074] (1) For a given sliding body, it is vertically divided into several bars of equal width (see figure 1 ), in the traditional limit equilibrium Spencer method, the force diagram of the i-th block in the Spencer method calculation model is shown in figure 2 , assuming that the forces between the blocks are parallel to each other, that is, θ i = θ is a constant, the resultant force △P between the bars on both sides of the bar, that is, the difference between the bars on both sides of the bar, is:

[0075]

[0076] (2) When the sliding surface is a circular-arc sliding surface, for the entire slope, the sum of the forces between each block is 0, that is:

[0077] ∑(P i+1 -P i )=0 (2)

[0078] (3) In the process of solving the bar moment balance, the resultant force △P...

Embodiment 3

[0087]Embodiment 3: A method for calculating the limit equilibrium of slope stability based on the distribution characteristics of the normal force between strips, the specific steps are as follows:

[0088] (1) For a given sliding body, it is vertically divided into several bars of equal width (see figure 1 ), in the traditional limit equilibrium Spencer method, the force diagram of the i-th block in the Spencer method calculation model is shown in figure 2 , assuming that the forces between the blocks are parallel to each other, that is, θ i = θ is a constant, the resultant force △P between the bars on both sides of the bar, that is, the difference between the bars on both sides of the bar, is:

[0089]

[0090] (2) When the sliding surface is a circular-arc sliding surface, for the entire slope, the sum of the forces between each block is 0, that is:

[0091] ∑(P i+1 -P i )=0 (2)

[0092] (3) In the process of solving the bar moment balance, the resultant force △P ...

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Abstract

The invention relates to a slope stability limit balance calculation method based on the inter-strip normal force distribution characteristics, and belongs to the technical field of slope stability. An inter-strip normal force distribution form is not considered when the slope stability is analyzed by a traditional limit balance strip division method, namely, the influence of different thrust lineacting positions on the safety coefficient is realized, based on an existing limit balance bar division method, the inter-strip normal force distribution characteristics are further considered, namely, the distribution of thrust line acting positions is realized, an improved limit balance calculation method considering inter-strip normal force distribution characteristics is provided, the resultof calculating the deep concave sliding surface by using the improved limit balance Spender method provided by the invention is discovered, an improved limit balance method and a traditional limit balance method have large safety coefficient errors, the error value reaches about 20%, the method has the advantages of being simple, convenient and reliable, a more accurate result is provided for slope stability analysis, the engineering safety can be improved, the construction cost can be reduced, and the engineering economic benefit can be improved.

Description

technical field [0001] The invention relates to a slope stability limit equilibrium calculation method based on the distribution characteristics of normal force between strips, and belongs to the technical field of slope stability. Background technique [0002] The limit equilibrium slicing method is a slope stability analysis method commonly used in the field of geotechnical engineering. Its principle is to divide the rock and soil mass into a series of blocks, and analyze the stress of each block according to the principle of limit equilibrium. Solve for the slope safety factor. The limit equilibrium method can be divided into Fellenius method, simplified Bishop method, Spencer method and Morgenstern-Price method according to different equilibrium conditions and different interstrip force assumptions. Duncan, Wu Shunchuan, etc. compared and analyzed the calculation accuracy of the above-mentioned limit equilibrium slice methods, and pointed out the scope of application of...

Claims

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Application Information

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IPC IPC(8): E02D1/00E02D17/20
CPCE02D1/00E02D17/20E02D1/02G06F30/20G06F2119/14G06F30/10G06F2111/10
Inventor 吴顺川韩龙强张小强程海勇任义
Owner KUNMING UNIV OF SCI & TECH
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