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Prediction method of considering slope stability under pore water effect

A prediction method and pore water technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as poor calculation accuracy, inability to accurately calculate the minimum safety factor of slopes and the most dangerous sliding surface

Active Publication Date: 2018-09-14
HOHAI UNIV
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Problems solved by technology

[0003] The present invention provides a method for predicting the stability of slopes under the action of pore water, which solves many assumptions made in the analysis of soil by using the limit analysis method in the prior art, which makes the calculation accuracy poor and the slope cannot be accurately calculated The minimum safety factor and the corresponding most dangerous sliding surface, as well as the technical issues of soil cracking position and depth range caused by pore water pressure

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  • Prediction method of considering slope stability under pore water effect
  • Prediction method of considering slope stability under pore water effect
  • Prediction method of considering slope stability under pore water effect

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Embodiment 1

[0126] The schematic diagram of the slope in this embodiment is as follows figure 1 As shown, the slope height H=10.0m, the strength parameters of the soil are: cohesion c=40KPa, internal friction angle φ=20°, soil weight γ=20.0KN / m 3 , the pore water pressure coefficient is r u = 0 (i.e. do not consider the effect of pore water pressure and r u =0.3; where the slope angle is i; the sliding surface is a logarithmic helix.

[0127] Step 1. The slope surface is expressed by equation

[0128] The slope surface equation is expressed as:

[0129]

[0130] Step 2: Establish the balance equation of the slope sliding body on the sliding surface according to the equilibrium conditions, use the principle of variational method to solve the equations to obtain the distribution of normal stress and effective stress on the sliding surface, and then determine the most dangerous sliding surface and solve the safety factor of the slope f s .

[0131] Step 3: By comparing F s and the ...

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Abstract

The invention discloses a prediction method of considering the slope stability under the pore water effect. The prediction method comprises the following steps of step 1, selecting a slope to be predicted, determining the section geometrical size of the slope, and expressing the surface geometrical shape and the sliding face shape of the slope with an equation; step 2, determining slope soil parameters; step 3, applying a variational method to establish a slope stability analysis equation set under the effect of a pore water pressure, solving the equation set to obtain a slope sliding face stress distribution condition, and determining a safety coefficient and a most dangerous sliding face; and step 4, judging the slope stability according to a stability coefficient critical value. The invention gives a slope stability calculation method of considering the pore water effect, can perform calculation to acquire a minimal safety coefficient of the slope and the corresponding most dangerous sliding face, can give a soil cracking position and depth range caused by the effect of the pore water pressure, is high in calculation efficiency and accuracy, is more close to engineering practiceand provides important guidance to practical slope engineering landslide early warning and reinforcing design.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a prediction method for slope stability under the action of pore water. Background technique [0002] At present, the variational method is used in the design of various artificial slopes and reinforced retaining walls, but the variational method does not consider the impact of pore water pressure in the slope on the stability of the slope caused by rainfall or groundwater and a sudden drop in the water level of the dam. Due to the impact of the limit analysis method on the soil, many assumptions made in the analysis of the soil make the calculation accuracy poor, and the minimum safety factor of the slope and the corresponding most dangerous sliding surface cannot be accurately calculated, as well as the effect of pore water pressure. The location and depth range of soil cracking caused by cracking. Contents of the invention [0003] The present invention provides...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 张飞戴光宇陈延博高玉峰周政柯力俊王占彬
Owner HOHAI UNIV
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