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A Method for Determining Horizontal Rigidity of Circular Support System in Foundation Pit

A technology of ring support and determination method, applied in excavation, infrastructure engineering, special data processing applications, etc., can solve problems such as deviation, uneconomical and unsafe supporting structure, etc.

Active Publication Date: 2018-01-26
SOUTH AFRICA SURVEY & DESIGN INST HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of foundation pit support structure design, the value of the horizontal stiffness coefficient of the circular support has become a difficult point for designers. Estimates, lack of basis, are likely to cause large deviations, and the designed support structure is either uneconomical or unsafe

Method used

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  • A Method for Determining Horizontal Rigidity of Circular Support System in Foundation Pit
  • A Method for Determining Horizontal Rigidity of Circular Support System in Foundation Pit
  • A Method for Determining Horizontal Rigidity of Circular Support System in Foundation Pit

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Experimental program
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Effect test

Embodiment Construction

[0054] Such as figure 1 As shown, the ring support system of the foundation pit of the present invention includes a ring beam 1, a launch beam 2, a connecting beam 3, a purlin 4, and a confining pressure load 5.

[0055] The implementation steps of the present invention are: first calculate the displacement of the support point :

[0056]

[0057] Where

[0058] Then calculate the compression deformation of the launch beam :

[0059]

[0060] Where , ,

[0061] Finally, calculate the horizontal stiffness of the ring support system :

[0062]

[0063] Technical effect evaluation

[0064] (1) Example application one

[0065] A deep foundation pit project adopts a circular ring support system, with a total of three internal supports, and the plan layout is detailed in image 3 , The concrete grade is C40, its elastic modulus is 32.5GPa, and the first ring beam is 1-1 diameter 72m, the second ring beam 1-2 diameter Is 88m, the third ring beam 1-3 diameter It is 105m. The section in...

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Abstract

The invention relates to a method for determining horizontal rigidity of a foundation pit ring support system. For foundation pit ring support systems (comprising ring beams, launching beams, connecting beams, enclosing purlins and confining pressure loads) in various arrangement forms, a stress distribution coefficient is introduced by a principle that the stress is distributed according to the rigidity, the calculation of the horizontal rigidity of the ring support system is subjected to analytic derivation, and a simple calculation method for the horizontal rigidity of the ring support system is proposed. The calculation is performed with the method, so that the method is reasonable in result, simple, feasible, high in reliability and low in calculation cost, and can provide a basis for a value of a horizontal rigidity coefficient of the foundation pit ring support system.

Description

Technical field [0001] The invention relates to a method for determining the horizontal rigidity of a ring support system of a foundation pit, which is suitable for determining the horizontal rigidity of a ring support system of various layout forms. Background technique [0002] With the rapid development and utilization of urban underground space, there are more and more foundation pit projects. Large scale, deep depth, and complex surrounding environment have become prominent features of foundation pit projects. At present, there are many forms of foundation pit support. Row piles or ground connecting wall plus internal support are currently used as a supporting structure. The internal support has a large support rigidity, and has a strong ability to control the deformation of the foundation pit and protect the surrounding environment. , And does not invade the surrounding underground space to form obstacles and other advantages. The layout of internal supports includes ortho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E02D17/04
Inventor 马郧李松郭运刘佑祥张杨范晓峰龙晓东罗春雨朱佳
Owner SOUTH AFRICA SURVEY & DESIGN INST HUBEI