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Method for calculating anti-capsizing critical built-in coefficient of unsaturated soil foundation pit retaining wall and application thereof

A calculation method and anti-overturning technology, applied in infrastructure engineering, water conservancy engineering, artificial islands, etc., can solve problems such as not considering the influence of intermediate principal stress

Inactive Publication Date: 2014-10-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above studies on the earth pressure and stability of unsaturated soil retaining walls are all based on the shear strength formula of unsaturated soil based on the M-C strength criterion, without considering the influence of the intermediate principal stress on the strength of unsaturated soil

Method used

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  • Method for calculating anti-capsizing critical built-in coefficient of unsaturated soil foundation pit retaining wall and application thereof
  • Method for calculating anti-capsizing critical built-in coefficient of unsaturated soil foundation pit retaining wall and application thereof
  • Method for calculating anti-capsizing critical built-in coefficient of unsaturated soil foundation pit retaining wall and application thereof

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Embodiment 1

[0103] The excavation depth of a foundation pit is H=6m, and the groundwater level is D w = 15m, the weight of homogeneous unsaturated soil γ = 18kN / m 3 , effective cohesion c′=3kPa, effective internal friction angle suction angle

[0104] Generally, there are two processing methods for unsaturated soil strength nonlinearity, such as image 3 Shown: First, there is no segmentation within the entire matrix suction range, and the suction angle is taken A small angle when it is always stable is called method 1; the second is according to the intake value (u a -u w ) b Divided into 2 sections, when the suction angle is greater than the intake value The hyperbolic model change according to formula (4b) is called method 2. Figure 4 is the suction angle of a cohesive soil With matrix suction (u a -u w ) changes in the experimental data, using the segmental hyperbolic model (4) can achieve better prediction results.

[0105] Depend on image 3 It can be seen that th...

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Abstract

The invention discloses a method for calculating the anti-capsizing critical built-in coefficient of an unsaturated soil foundation pit retaining wall and the application thereof. The method comprises the following steps that the plane strain shear strength unified solution with the nonlinear strength of unsaturated soil under high matrix suction is calculated; the active and passive soil pressure intensity of the unsaturated soil is calculated; the capsizing torque and the anti-capsizing torque of the anti-capsizing stability of the foundation pit retaining wall are calculated; when the matrix suction is not changed or in linear change along the depth, the cubic equation of an anti-capsizing critical built-in depth D1 is calculated, and therefore the anti-capsizing critical built-in coefficient of the unsaturated soil foundation pit retaining wall is obtained. According to the method, based on the plane strain shear strength unified solution of the unsaturated soil, the middle main stress effect and the nonlinearity of the strength of the unsaturated soil are considered, the anti-capsizing critical built-in depth equation of the foundation pit rigid retaining wall under two kinds of matrix suction distribution is derived, engineering application steps are given out, parameter influence characteristic analysis is conducted on anti-capsizing critical built-in coefficients which are newly provided, and a certain theoretical foundation is provided for reasonable design and construction of an unsaturated soil foundation pit supporting structure.

Description

technical field [0001] The invention relates to a method for calculating the overturning critical embedding coefficient of an unsaturated soil foundation pit retaining wall and its application. Background technique [0002] Saturated soil can be regarded as a special case of unsaturated soil, but there are great differences in mechanical properties between unsaturated soil and saturated soil. True triaxial tests of unsaturated soils have shown that the intermediate principal stress has a significant effect on the strength of unsaturated soils. The anti-overturning stability of the retaining wall is one of the important contents in the design of modern complex foundation pits. Due to the measures such as dewatering at well points outside the pit or in the pit during construction, most of the soil around the foundation pit is in an unsaturated state. However, the existing The anti-overturning stability check calculation of the foundation pit retaining wall is still based on t...

Claims

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Application Information

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IPC IPC(8): E02D29/02
Inventor 张常光赵均海孙珊珊张冬芳朱倩
Owner CHANGAN UNIV
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