Method for caculating displacement of nearby existing subway tunnel due to foundation pit excavation

A calculation method, the existing subway technology, applied in the direction of calculation, design optimization/simulation, special data processing applications, etc., can solve the problems that the horizontal convergence value of the tunnel cannot be calculated, the surface displacement is different, etc.

Active Publication Date: 2017-01-18
ZHEJIANG UNIV CITY COLLEGE
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Problems solved by technology

Therefore, the tunnel does not move horizontally as a whole, and its surface displacements are all different, and the existing method cannot calculate the horizontal convergence value of the tunnel

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  • Method for caculating displacement of nearby existing subway tunnel due to foundation pit excavation
  • Method for caculating displacement of nearby existing subway tunnel due to foundation pit excavation
  • Method for caculating displacement of nearby existing subway tunnel due to foundation pit excavation

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Embodiment Construction

[0120] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0121] like Figure 1~6 As shown, the present invention provides a specific embodiment of the calculation method for the displacement of adjacent existing subway tunnels caused by excavation of a foundation pit, due to consideration of:

[0122] (1) When the foundation pit is excavated, it is protected by the enclosure structure (including the shaft wall and inner support or outer support), so it will not be completely unloaded; the calculation formula for the equivalent additional stress on the side wall generated by the excavation of the foundation pit should be multiplied by a Reduction coefficient β, where: β is the stress loss rate of the foundation pit enclosure structure, which is equal to the ratio of the final released side wall stress to the initial side wall stress, β<1;

[0123] Then the equivalent load becomes: βK ...

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Abstract

The invention provides a method for caculating displacement of a nearby existing subway tunnel due to foundation pit excavation. The method specifically comprises the following steps of establishing a calculation model first, performing unloading analysis on the pit bottom, then performing unloading analysis on the side walls of a foundation pit, and finally, obtaining the horizontal total displacement Sx and the vertical total displacement Sz, which are caused by unloading stress generated by the pit bottom and surrounding side walls of the foundation pit, of a certain point (x1, y1, z1) on the outer side of the tunnel by utilizing a superposition principle; in order to accurately calculate the outside displacement of the tunnel under the action of loads of the pit bottom and surrounding side walls of the foundation pit, the half-side tunnel towards the foundation pit is uniformly divided into a plurality of points, displacement values of the plurality of points are respectively calculated, and finally, an average displacement value is used as the displacement value of the tunnel.Therefore, the construction of a specific project can be simulated by using the method before construction so as to calculate the displacement of the subway tunnel in specified working conditions, and if the displacement of the tunnel exceeds a corresponding allowable value, related construction parameters can be adjusted for trial computation till reaching safety standards.

Description

technical field [0001] The invention relates to a calculation method for the displacement of an adjacent existing subway tunnel caused by excavation of a foundation pit, and belongs to the technical field of underground engineering. Background technique [0002] (1) Predecessors may have considered the stress release effect of the surrounding pit walls. Since the Mindlin solution is only applicable to elastic half-space bodies, after the foundation pit is excavated, only the displacement caused by the wall stress on the side adjacent to the tunnel can be calculated; the wall stress on the side far away from the tunnel cannot pass through the soil (excavated) transfer, is incalculable. Therefore, from the perspective of calculation methods, it is problematic to consider the stress of the surrounding pit walls. [0003] (2) Or only consider the pit wall stress adjacent to the tunnel side. From a theoretical analysis, only considering the pit wall stress on one side will lea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 魏纲赵城丽林雄朱田宇陆世杰宋宥整许奎鑫张鑫海黄文王彬
Owner ZHEJIANG UNIV CITY COLLEGE
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