Method for determining safe distance between concealed karst cave and newly built mountain tunnel

A technique for determining the method and safety distance, which is applied in the field of determining the safety distance between hidden karst caves and newly built mountain tunnels, and can solve problems such as troublesome simulation calculation process of the safety distance between hidden karst caves and tunnels

CN103577642AInactive Publication Date: 2014-02-12CHINA STATE CONSTRUCTION ENGINEERING CORPORATION

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
Publication Date: 2014-02-12
Estimated Expiration: Not applicable · inactive patent

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Abstract

The invention belongs to the field of tunnel engineering, and particularly relates to a method for determining the safe distance between a concealed karst cave and a newly built mountain tunnel. According to the method, ANSYS software is used for building a finite element model with the safe distance between the concealed karst cave and the mountain tunnel, tunnel construction sequence is simulated to solve finite elements, plastic strain energy corresponding to the rock stratum between the concealed karst cave and the mountain tunnel after distance reduction each time is calculated, the change sequence between the distance between the karst cave and the mountain tunnel and the plastic strain energy of the rock stratum between the concealed karst cave and the mountain tunnel is built, an energy mutation characteristic value is further calculated, and when the energy mutation characteristic value is smaller than or equal to zero, the safe distance between the concealed karst cave and the mountain tunnel is output. The energy mutation of the rock stratum between the concealed karst cave and the mountain tunnel is taken as a criterion of the safe distance, the determined safe distance is smaller than the safe distance determined with a conventional plastic zone criterion, and the method overcomes the defects that traditional analog calculation of the safe distance between the concealed karst cave and the mountain tunnel on the basis of plastic zone cutthrough is troublesome in process and unreasonable in result, ensures safety of the karst mountain tunnel, and reduces occurrence probability of karst accidents.

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Description

technical field

[0001] The invention relates to the technical field of tunnel engineering, in particular to a method for determining a safe distance between a concealed karst cave and a newly built mountain tunnel. Background technique

[0002] The current research on the construction of karst tunnels is deepening, and the construction of tunnels in karst areas is booming. When there are hidden karst caves around the tunnel, how to reasonably determine the safe distance between them is a very difficult technical problem. It is related to whether the tunnel can Smooth construction and safe operation determine the length and buried depth of the tunnel to a certain extent. The smaller the distance between the two, the smaller the distance between the tunnel and the karst cave. The shorter the tunnel, the lower the project cost, but the danger of tunnel instability Sex is also greater.

[0003] At present, the engineering design of the safety distance between hidden karst caves...

Claims

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