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Soil-rock combined slope stability analysis method based on graphic trial algorithm

A technology of stability analysis and trial algorithm, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inconsistent failure forms of rock slopes, complex shapes of slope sliding surfaces, and lack of theoretical support

Active Publication Date: 2020-11-10
HEFEI MUNICIPAL DESIGN INST
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Problems solved by technology

[0002] In the existing slope stability analysis methods, the slice method is often assumed to be a circular sliding surface for soil, and the limit equilibrium method is often assumed to be a plane sliding surface for rock mass; when encountering a soil-rock combined slope, The shape of the actual sliding surface of the slope is more complex, and there is a lack of corresponding theoretical support for slope stability analysis
[0003] In the prior art, the slope stability analysis method only analyzes a single soil slope or a single rock slope independently. The analysis of the circular sliding surface of the slope does not match the actual failure form of the rock slope

Method used

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  • Soil-rock combined slope stability analysis method based on graphic trial algorithm
  • Soil-rock combined slope stability analysis method based on graphic trial algorithm
  • Soil-rock combined slope stability analysis method based on graphic trial algorithm

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Embodiment

[0028] Such as figure 1 Shown is a schematic flowchart of a specific embodiment of the soil-rock combination slope stability analysis method based on the graphical trial algorithm of the present invention.

[0029] Specifically, such as figure 2 As shown, in step 1, starting from the toe of the lower rock mass, assume that the inclination angles of the plane sliding surface are 10°, 20°, 30°, 35°, 40°, 45°, 50°, 60°, 70°, 75° , 80°, and 45°+φ / 2 (φ is the internal friction angle of the rock mass), the limit equilibrium method is used to analyze the entire slope, and the most unfavorable plane sliding surface (that is, the most unfavorable dip angle α corresponding to the minimum safety factor Fs1 );

[0030] Such as image 3 As shown, in step 2, the slice method is used to search for the most unfavorable arc sliding surface for the hypothetical circular sliding surface of the upper soil mass; the most unfavorable plane sliding surface is made for the lower rock mass with th...

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Abstract

The invention discloses a soil-rock combined slope stability analysis method based on a graphic trial algorithm. The method comprises the following steps: from a slope toe, obtaining a first minimum safety factor Fs1 by adopting an extreme balance method; secondly, searching the most unfavorable arc sliding surface of the supposed arc sliding surface of the upper soil body by adopting a slitting method, and calculating the residual gliding force; drawing the lower rock mass at the first worst inclination angle alpha to obtain a sliding structural surface, and taking the soil strip gravity andthe downward sliding force of the upper soil mass contained in the upper sliding structural surface as external loads to obtain a second minimum safety coefficient Fs2; from the slope toe, taking a rock-soil body, which is separated from the arc sliding surface of the soil body by the most unfavorable sliding surface of the upper soil body and the tangent plane of the lower rock body in a rock body, as an independent body to obtain a third minimum safety coefficient Fs3; and taking the minimum value as the final minimum safety factor Fsmin of the soil-rock combined slope. The invention conforms to the assumption of the traditional soil mechanics on the arc sliding surface of the soil body and the assumption of the traditional rock mechanics on the inclined sliding surface of the rock body.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering and slope protection, in particular to a soil-rock combination slope stability analysis method based on a graphical trial algorithm. Background technique [0002] In the existing slope stability analysis methods, the slice method is often assumed to be a circular sliding surface for soil, and the limit equilibrium method is often assumed to be a plane sliding surface for rock mass; when encountering a soil-rock combined slope, The shape of the actual sliding surface of the slope is more complex, and there is a lack of corresponding theoretical support for slope stability analysis. [0003] In the prior art, the slope stability analysis method only analyzes a single soil slope or a single rock slope independently. The circular sliding surface analysis of the slope is inconsistent with the actual failure form of the rock slope. [0004] Therefore, how to make the soil-rock combine...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F119/14
CPCG06F30/13G06F2119/14
Inventor 张兴其张乾坤严中潘磊谷永涛
Owner HEFEI MUNICIPAL DESIGN INST
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