Method for determining minimum burial depth of complex stratum shield tunnel

A technology of shield tunneling and composite strata, which is applied in tunnels, earthwork drilling, mining equipment, etc., to achieve the effects of simple structure, saving engineering costs, and low construction costs

Inactive Publication Date: 2017-05-31
CHINA RAILWAY LIUYUAN GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has good applicability in soft strata such as silt or silty soil, but it is not suitable for non-silt strata and composite strata such as clay and weathered rock strata, and a suit...

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  • Method for determining minimum burial depth of complex stratum shield tunnel
  • Method for determining minimum burial depth of complex stratum shield tunnel
  • Method for determining minimum burial depth of complex stratum shield tunnel

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] see as figure 1 and figure 2 As shown, this embodiment adopts the following technical scheme: its construction steps are as follows: according to the structure of the tunnel segment joint 12, determine the maximum shear force it can bear, that is, the joint shear force 14; the joint shear force 14 The relationship between the synchronous grouting filling area 5, the synchronous grouting position 11 and the grouting pressure 15, determine the reasonable pressure standard of the synchronous grouting position 11 as the grouting pressure 15 of tunnel grouting; according to the grouting filling area 5. Synchronous grouting position 11 and grouting pressure 15 are used to calculate the dynamic buoyancy of shield tunnel 4; the sum of dynamic buoyancy and static buoyancy is the ultimate buoyancy during tunnel construction; the buoyancy affects the shear of the overlyi...

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Abstract

The invention relates to the technical field of tunnel construction and discloses a method for determining a minimum burial depth of a complex stratum shield tunnel. The method includes construction steps: determining a bearable maximum shear force of the shield tunnel according to a joint structure of the shield tunnel; according to a relation between the maximum shear force and a synchronous grouting pressure, determining a reasonable grouting pressure standard as a tunnel grouting control pressure; calculating according to the synchronous grouting pressure to obtain a tunnel dynamic buoyancy force, wherein the sum of the dynamic buoyancy force and a static buoyancy force is an extreme buoyancy force in a tunnel construction process; according to a shear destructive force of overlaying soil, determining a stratum limit buoyancy force which limits tunnel uplifting, wherein the sum of the limit buoyancy force and the dead weight of the tunnel is an anti-buoyancy force of the tunnel structure; comparing the extreme buoyancy force with the anti-buoyancy force to obtain the thickness of the overlaying soil, namely the minimum burial depth of the tunnel. The method is suitable for complex strata and non-silt strata such as clay and weathered strata, high flexibility in tunnel wiring is achieved, tunnel length is further reduced, and accordingly engineering cost is saved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for determining the minimum buried depth of a shield tunnel in a complex stratum. Background technique [0002] With the development of my country's economy and society, more and more tunnels are used as important means of transportation construction, and the shield tunnel with the highest degree of mechanization in the tunnel has also been vigorously developed. In recent years, the shield tunnels built (under construction) in my country The total mileage has reached thousands of kilometers. For shield tunnels, the determination of the minimum buried depth is the core issue of tunnel design, which is directly related to the realization of engineering traffic functions, construction cost savings and construction safety. At present, the method commonly used in China is based on the principle of mud splitting, that is, the minimum buried depth is obtained by bac...

Claims

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Application Information

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IPC IPC(8): E21D9/06
CPCE21D9/06
Inventor 贺维国于勇阳军生梁禹马军秋李腾飞邢永辉刘庆方范国刚
Owner CHINA RAILWAY LIUYUAN GRP CO LTD
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