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Circular foundation pit stability analysis method based on limit analysis upper limit theorem

An upper limit theorem and analysis method technology, applied in the field of stability analysis of circular foundation pits based on the upper limit theorem of limit analysis, can solve problems such as inaccurate stability indicators of foundation pits, and achieve a clear foundation in mechanical theory, high calculation accuracy, and high The effect of computational precision

Pending Publication Date: 2020-12-11
YANCHENG INST OF TECH
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Problems solved by technology

Due to some deficiencies in limit equilibrium method, finite element method and traditional limit analysis upper limit method, the stability index of foundation pit obtained by solution is not accurate enough

Method used

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  • Circular foundation pit stability analysis method based on limit analysis upper limit theorem
  • Circular foundation pit stability analysis method based on limit analysis upper limit theorem
  • Circular foundation pit stability analysis method based on limit analysis upper limit theorem

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Embodiment

[0063] see Figure 1-6 , the circular foundation pit stability analysis method based on the limit analysis upper limit theorem, solves the limit load of a simple circular foundation pit, and makes a comparative analysis with the existing solution.

[0064] (1) Calculation parameters of the proposed circular foundation pit

[0065] Such as image 3 The circular foundation pit shown is taken as Figure 4 section. The diameter of the circle is D=10m, the excavation depth is H=5m, the calculation assumes that the soil is elastic-plastic and obeys the Mohr-Column yield criterion; the cohesion strength of the soil is c, the internal friction angle φ, and the soil weight is gamma. Table 1 is the material physics and mechanics parameter table of embodiment 1:

[0066]

[0067] Table 1: Physical and Mechanical Parameters of Rock Slope in Example 1

[0068] (2) The circular foundation pit of embodiment 1 is discretized by triangular three-node elements, that is, the allowable ve...

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Abstract

The invention discloses a circular foundation pit stability analysis method based on a limit analysis upper limit theorem, belongs to the technical field of geotechnical foundation pit engineering stability analysis, takes a circular foundation pit as a research object, and comprises the following steps: according to the actual situation of the circular foundation pit, drawing up basic informationfor performing circular foundation pit stability; dispersing the circular foundation pit by adopting a triangular three-node plastic unit; generating a constraint control equation obeying a limit analysis upper limit theorem; establishing an upper limit finite element method mathematical optimization model for solving the stability of the circular foundation pit; performing numerical solution ofthe mathematical model of the circular foundation pit stability upper limit finite element method; and introducing a local grid adaptive encryption technology to automatically carry out local grid encryption on the damaged area. Compared with a traditional limit equilibrium analysis method, the method has higher calculation precision; compared with a finite element method, the method neglects theconstitutive relation of the material, so that the calculation speed and efficiency are higher.

Description

technical field [0001] The invention belongs to the technical field of stability analysis of rock and soil foundation pit engineering, in particular to a circular foundation pit stability analysis method based on the limit analysis upper limit theorem. Background technique [0002] With the improvement of urbanization level, in the development and utilization of underground space for various purposes such as multi-storey basements of high-rise buildings, underground railways and underground stations, underground parking lots, underground shopping malls, underground warehouses, underground municipal facilities, industrial and military facilities, etc. , all involve various deep and large foundation pit problems. The stability of foundation pits has always been a research hotspot in the field of geotechnical engineering. [0003] At present, the calculation of foundation pits in the code is mainly based on strip-shaped foundation pits, but there is a lack of corresponding cal...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G06F111/04G06F111/10G06F119/14
CPCG06F30/13G06F30/23G06F2111/04G06F2111/10G06F2119/14Y02T10/40
Inventor 赵乙丁史尧孙锐吴发红
Owner YANCHENG INST OF TECH
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