Rock-soil shear strength parameter fine acquisition method under excavation supporting conditions

A technology of shear strength and acquisition method, which is applied in the analysis field of acquiring shear strength parameters under the condition of rock and soil excavation and support, can solve the problem that the shear strength parameters of rock and soil mass in different regions cannot be accurately obtained, etc.

Pending Publication Date: 2020-05-15
POWERCHINA XIBEI ENG
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  • Abstract
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Problems solved by technology

[0006] In order to solve the unloading situation of the traditional rock and soil mass, the conventional triaxial test method is uniformly used, and the shortcomings of the shear strength parameters of the rock and soil mass in different regions cannot be accurately obtained

Method used

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  • Rock-soil shear strength parameter fine acquisition method under excavation supporting conditions
  • Rock-soil shear strength parameter fine acquisition method under excavation supporting conditions

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Embodiment 1

[0028] In order to solve the unloading situation of traditional rock and soil mass, the conventional triaxial test method is adopted uniformly, which cannot accurately obtain the shear strength parameters of rock and soil mass in different regions. The present invention provides as figure 1 Shown is a refined acquisition method of rock and soil shear strength parameters under the condition of excavation and support. The present invention can obtain relatively accurate shear strength parameters of rock and soil in different regions under the condition of excavation and unloading of rock and soil. Or slope safety and stability analysis provides a more detailed and accurate basis.

[0029] A method for obtaining refined shear strength parameters of rock and soil under excavation and support conditions, characterized in that the specific steps are:

[0030] Step 1, according to the actual situation of the unloaded rock and soil mass, judge the potential slip surface 4 of the soi...

Embodiment 2

[0036]On the basis of Embodiment 1, in the present embodiment, in the step 1, the soil body is a foundation pit or a side slope, and the unexcavated plane of the foundation pit or the side slope is the original platform 1, and the excavation area will be 2 Excavation platform 3 is formed after excavation, and its potential slip surface 4 is judged.

[0037] Preferably, in the step 2, the rock and soil mass under the unloaded state between the excavation platform 3 and the potential slip surface 4 is divided into zone I 5, and the unloaded state between the original platform 1 and the potential slip surface 4 The underlying rock and soil mass is divided into Zone III 7, in which multiple prestressed anchor cables 8 are installed, and the prestressed anchor cables 8 are connected to the pile foundation 9; the soil outside the potential slip surface 4 is divided into Zone II 6 ; The major principal stress 5-1 in zone Ⅰ of 5 rocks and soils in zone Ⅰ decreases, the principal stres...

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Abstract

The invention provides a rock-soil shear strength parameter fine acquisition method under excavation supporting conditions. The method comprises the following specific steps: step 1, judging a potential slip crack surface of a soil body according to the actual condition of unloading the rock-soil body; step 2, judging the states of different regions of the rock-soil body according to the potentialslip crack surface, and dividing the rock-soil body into a region I, a region II and a region III; step 3, selecting different shear strength parameter test methods according to the stress paths of the stress states of the region I, the region II and the region III in the rock-soil body excavation process; and step 5, obtaining unloading shear strength parameters of the rock-soil bodies in different regions according to different test methods selected by rock-soil bodies in different regions, and determining the soil body stability of the soil bodies in different regionss. According to the method, region division is carried out according to the stress state change under the rock-soil body unloading condition, an appropriate triaxial test method is selected for different regions, then rock-soil body unloading shear strength parameters can be obtained in a refined mode and a more detailed and accurate basis is provided for foundation pit or slope safety and stability analysis.

Description

technical field [0001] The invention relates to an analysis method for obtaining shear strength parameters under rock and soil excavation and support conditions, in particular to an analysis method for refined acquisition of shear strength parameters in foundation pit or slope excavation and unloading geotechnical engineering problems. Background technique [0002] Cohesion c、 friction angle φ It is essential for evaluating the physical and mechanical properties of rock and soil. Triaxial shear test is a recognized and important test method for studying the above indicators. According to the experimental principle, assuming that a rock-soil micro-unit is in a balanced state, there must be three stresses acting on the mutually perpendicular planes at a certain point, which are called major principal stresses. σ 1 , the principal stress σ 2 , small principal stress σ 3 ; The acting surfaces perpendicular to the three principal stresses are respectively called the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025G01N2203/0256
Inventor 黄鹏狄圣杰陆希
Owner POWERCHINA XIBEI ENG
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