Method for processing and excavating large cave crossing through tunnel body

A technology for large-scale karst caves and tunnels, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of frequent conversion of construction procedures, inconvenient mechanical construction, unfavorable closing time, etc., so as to facilitate the conversion of construction procedures and high promotion and application value , The effect of facilitating mechanized construction

Active Publication Date: 2016-12-07
BEIJING MUNICIPAL ROAD & BRIDGE
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Problems solved by technology

[0005] The purpose of the present invention is to provide a large-scale karst cave treatment and excavation method that traverses the tunnel body. It is necessary to solve the problem that the existing tunnels have a long constru

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  • Method for processing and excavating large cave crossing through tunnel body
  • Method for processing and excavating large cave crossing through tunnel body

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Embodiment Construction

[0027] Examples see Figure 1-2 The tunnel to be excavated shown is a karst tunnel with a maximum span of 18 meters. The large karst cave 17 crosses the lower part of the left wall and the entire floor from the right side wall of the tunnel. The construction steps of karst cave treatment and excavation method are as follows:

[0028] Step 1, when the large karst cave 17 crosses the side wall and floor of the tunnel to be excavated, formwork is set up on both sides of the elevation of the side wall and floor and the lower side of the floor, and two concrete supports are integrally poured. The cross-sectional dimension of the concrete support is larger than the height of the large karst cave, and the upper and lower parts of the concrete support need to be buried in the upper surrounding rock 5 of the karst cave and the lower surrounding rock 3 of the karst cave respectively, and the longitudinal length of the concrete support is longer than that of the karst cave. The depth of...

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Abstract

The invention relates to a method for processing and excavating a large cave crossing through a tunnel body. The method comprises the steps of processing the cave; grouting in advance; excavating an arc-shaped pilot tunnel on the upper part; excavating the middle steps; excavating the lower steps; excavating the three layers of steps on the middle part. According to the method provided by the invention, the construction space is large; the mechanical construction is convenient; the parallel operation of multiple operation planes can be performed; the work efficiency is higher; the construction process can be flexibly and timely switched and the construction method can be adjusted when the geological conditions are changed; the method can adapt to different spans and various section forms; the primary lining process operation is convenient; on the basis of step-method excavating, the core soil is reserved, left and right staggered excavating is performed and the stability of the excavating plane is benefited; when the deformation of the surrounding rock is large or sudden, the closing time can be adjusted as soon as possible under the conditions of ensuring safety and meeting clearance requirement; the method can be widely applied to the tunnel excavating construction for quickly, safely and effectively passing the geological conditions on the stratum under special geological conditions of the cave, so as to ensure the construction and tunnel safety.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for treating karst caves and excavating large karst caves when tunnel excavation encounters deep dredging and full filling of large karst caves. Background technique [0002] The formation of caves is the result of long-term dissolution of groundwater in limestone areas. The insoluble calcium carbonate in limestone can be converted into slightly soluble calcium bicarbonate by the action of water and carbon dioxide. This geological phenomenon will affect the stability and mechanical distribution of surrounding rock, and affect the quality of surrounding engineering construction. [0003] In engineering construction, some construction techniques have a great influence on the stress distribution of surrounding rocks. Unavoidable karst caves are encountered, unsafe and unstable factors of engineering structures increase, construction techniques become complicated, and the ...

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Application Information

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IPC IPC(8): E21D9/04E21D11/00E21D11/10E21D11/18E21D20/00E21F16/02
Inventor 马瑞石银峰周世生蔡玮翟相飞梁红忠张春发王怀雄王涛王翰春叶锦华
Owner BEIJING MUNICIPAL ROAD & BRIDGE
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