Dynamic adjustment method of support prestress of excavation transverse support in foundation pit near large load bias

A dynamic adjustment and prestressing technology, applied in excavation, infrastructure engineering, special data processing applications, etc., can solve problems such as insufficient support force, inability to stabilize foundation pit deformation, and building damage

Active Publication Date: 2019-01-15
THE FIRST ENG OF CHINA RAILWAY 16TH CONSTR BUREAU GROUP
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Problems solved by technology

Therefore, the prestress applied in the cross brace should be moderate, neither too large nor too small. If the prestress is too small, the supporting force will be insufficient and the de

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  • Dynamic adjustment method of support prestress of excavation transverse support in foundation pit near large load bias
  • Dynamic adjustment method of support prestress of excavation transverse support in foundation pit near large load bias
  • Dynamic adjustment method of support prestress of excavation transverse support in foundation pit near large load bias

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[0084] In order to further illustrate the technical solution of the present invention, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0085] The invention discloses a method for dynamically adjusting the prestress of the transverse support in the excavation of an adjacent large-load biased foundation pit, which comprises the following steps:

[0086] Step 1: Calculate the earth pressure function of the side wall of the foundation pit;

[0087] Step 2: Determine the prestress of each row of horizontal supports according to the earth pressure function;

[0088] Step one includes the following sub-steps:

[0089] S11: Establish a coordinate system according to the actual situation;

[0090] In order to find the earth pressure caused by the eccentric load and the self-weight stress of the soil on the side wall of the foundation pit, it is necessary to establish a suitable coordinate system. In the present invention, the orig...

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Abstract

The invention relates to a determination and adjustment method of support prestress values of transverse supports of a foundation pit under the condition near large load bias, the method includes thesteps that firstly, an earth pressure function of the edge wall of the foundation pit is calculated; and secondly, according to the earth pressure function, prestress values of all levels of the transverse supports are determined. According to the method for calculating the to-be-applied prestress values by the transverse supports at different levels in the foundation pit according to the condition of bias load distribution, engineering workers can quickly and efficiently adjust supporting parameters of the transverse supports of the foundation pit dynamically according to the bias load condition existing in the site, thus construction safety and reliability are improved, and the practical engineering value is achieved.

Description

technical field [0001] The invention relates to the technical fields of foundation pit support, excavation of urban subway stations, etc., in particular to a method for determining and adjusting parameters of subway foundation pit support under the condition that the city is close to a large bias load. Background technique [0002] During the excavation of the foundation pits of urban subway stations, there are often large structures near the foundation pits. Due to their own gravity, the large structures will squeeze the surrounding soil. When excavating the foundation pit, the soil in the surrounding area needs to be Pre-reinforcement is carried out, otherwise it will cause excessive displacement of the side wall of the foundation pit after the excavation of the foundation pit due to excessive extrusion stress of the soil, and cracks or even instability of the foundation pit wall will occur. After the excavation of the foundation pit, a common method of supporting the foun...

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Application Information

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IPC IPC(8): E02D17/04G06F17/50
CPCE02D17/04E02D2250/0046G06F30/13
Inventor 马栋高栋褚人猛黄锋罗镇王红杨文志王贤潘英伟魏光全朱继通莫滨
Owner THE FIRST ENG OF CHINA RAILWAY 16TH CONSTR BUREAU GROUP
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