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Method for calculating ground surface settlement in similar rectangular shield tunnel construction

A surface subsidence, rectangular shield technology, used in computing, special data processing applications, instruments, etc.

Active Publication Date: 2017-07-07
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, at present, there are no research results on the theoretical calculation of ground subsidence caused by the construction of quasi-rectangular shield tunneling in China.

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  • Method for calculating ground surface settlement in similar rectangular shield tunnel construction
  • Method for calculating ground surface settlement in similar rectangular shield tunnel construction
  • Method for calculating ground surface settlement in similar rectangular shield tunnel construction

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Embodiment Construction

[0084] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0085] Taking the similar rectangular shield project at Chenpodu Station in the first phase of Ningbo Rail Transit Line 3 as an actual case, the calculation example is analyzed.

[0086] Tunnel excavation face axis buried depth w 1 = 13.33m, the distance between the centers of the left and right semicircles S = 4.56m, the radius R of the excavation surface semicircle = 3.63m, and the weighted average value of the internal friction angle of the overlying soil is 15.5°.

[0087] The maximum soil loss rate ε at the DM34 monitoring section when the surface settlement tends to be stable max =1.6%, the excavation surface convergence mode parameter α=0.45. Calculate the equivalent soil loss parameter g=0.0749m, and the buried depth w of the axis after the tunnel excavation surface converges 2 = 13.3469m, the tangent value of the main...

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Abstract

The invention provides a method for calculating ground surface settlement in similar rectangular shield tunnel construction. Based on a random medium theory, derivation is performed to obtain a calculation formula for transverse ground surface settlement caused by the similar rectangular shield tunnel construction, and an excavation face convergence mode parameter alpha is introduced, so that the formula is suitable for working conditions of multiple excavation face convergence modes. A corrected soil body loss rate longitudinal change formula is proposed for calculating a soil body loss rate of any section in an excavation direction, so that the formula is extended longitudinally, and a three-dimensional ground surface settlement calculation formula is obtained. Calculation is performed to obtain a settlement value for predicting a ground surface calculation point caused by similar rectangular shield tunnel excavation, and the ground surface settlement caused by the similar rectangular shield tunnel excavation is predicted, thereby preventing safety accidents due to excessive settlement in construction.

Description

technical field [0001] The invention relates to a method for calculating ground surface settlement in the construction of a similar rectangular shield tunnel, belonging to the technical field of underground engineering. Background technique [0002] In recent years, many major cities in China have built subway tunnels. The quasi-rectangular shield combines the advantages of a circular shield with reasonable stress, convenient mechanized construction, and high utilization of the rectangular shield section, and has become a new choice for building urban subways and efficiently utilizing underground space. However, compared with the single-circle shield, the excavation section of the quasi-rectangular shield is larger, so the surface settlement caused by the construction is larger and the scope of influence is wider. Therefore, it is of great guiding significance and application value to study the prediction method of surface settlement caused by the construction of quasi-rect...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 魏纲张鑫海徐银锋朱田宇崔程虹蔡诗淇洪子涵许讯
Owner ZHEJIANG UNIV CITY COLLEGE