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Method for determining pressure of surrounding rock of shallow-buried neighborhood tunnel in composite stratum

A technology of composite formation and determination method, applied in the direction of using stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the problems of incomplete matching of the situation and difficult engineering.

Active Publication Date: 2018-08-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this method assumes that the tunnels are all excavated in full section, and only considers a single stratum condition, which is not completely consistent with the actual engineering situation, and it is difficult to guide the actual engineering

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  • Method for determining pressure of surrounding rock of shallow-buried neighborhood tunnel in composite stratum
  • Method for determining pressure of surrounding rock of shallow-buried neighborhood tunnel in composite stratum
  • Method for determining pressure of surrounding rock of shallow-buried neighborhood tunnel in composite stratum

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Embodiment Construction

[0121] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0122] Specific application examples are provided below, and the parts that are not described in detail in the examples are carried out with reference to the description in the summary of the invention.

[0123] For a tunnel excavation project for Chongqing Rail Transit Loop Line, the surrounding rock of the selected tunnel section is composed of sandy mudstone on the upper layer and sandstone on the lower layer. The sandy mudstone layer is 7m thick, and the thickness from the rock boundary to the ...

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Abstract

The invention provides a method for determining pressure of surrounding rock of a shallow-buried neighborhood tunnel in a composite stratum. The method comprises steps as follows: step 1, acquiring division information of a tunnel rock-soil body, physical and mechanics parameters of the rock-soil body and design information of a tunnel structure; step 2, determining the position of fracture surfaces of rock-soil bodies of two tunnels and a surrounding rock breakage mode; step 3, determining calculation parameters according to the breakage mode; step 4, determining tunnel arch distributed loadaccording to the breakage mode; step 5, determining the horizontal pressure of the tunnel according to the breakage mode. Breakage of the surrounding rock of the neighborhood tunnel in the composite stratum comprises two sliding breakage modes, namely, a breakage mode A and a breakage mode B; with the consideration of the influence of the excavation sequence of the composite stratum and the tunnelon the surrounding rock, the method for determining vertical arch pressure and lateral horizontal pressure of the shallow-buried neighborhood tunnel under the condition of the composite stratum is provided, and the method is simple and high in applicability.

Description

technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for determining the surrounding rock pressure of a shallow-buried tunnel with a small clear distance in a composite stratum. Background technique [0002] During the tunnel construction process, due to the disturbance of the excavation, the surrounding rock around the tunnel will be deformed, loosened, shifted, squeezed, fractured and so on. In order to prevent the large deformation of the surrounding rock and ensure the safety and reliability of the project, the tunnel construction needs to erect permanent or temporary structures to support the surrounding rock. The key to the rational design of the support structure is to accurately determine the stress of the surrounding rock. Most scholars at home and abroad only study the calculation of the surrounding rock pressure of tunnels in a single stratum, but in actual engineering situations, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0067G01N2203/0256
Inventor 杨晨吕海敏张宁沈水龙许烨霜吴怀娜
Owner SHANGHAI JIAO TONG UNIV
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