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A large-scale karst cave treatment and tunnel excavation method with deep dredging and full filling

A technology for excavating large-scale karst caves and tunnels. It is used in tunnels, tunnel linings, and earth-moving drilling and mining. It can solve the problems of frequent conversion of construction procedures, inconvenient mechanical construction, and adjustment of closing time. Effect of applying value, adjusting closing time

Active Publication Date: 2018-10-30
BEIJING MUNICIPAL ENG RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 tunnel excavation method with deep dredging and full filling. It is necessary to solve the problems of long construction time when existing tunnels pass through karst caves, which is not conducive to timely adjustment of closing time and inconvenient machinery. Technical problems of frequent conversion of construction and construction procedures

Method used

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  • A large-scale karst cave treatment and tunnel excavation method with deep dredging and full filling
  • A large-scale karst cave treatment and tunnel excavation method with deep dredging and full filling
  • A large-scale karst cave treatment and tunnel excavation method with deep dredging and full filling

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Embodiment Construction

[0029] Examples see Figure 1-3 The tunnel to be excavated is shown as a karst tunnel with a maximum span of 18 meters. The left half needs to pass through a large karst cave that is deeply dredged and filled. The construction steps of karst cave treatment and tunnel excavation method are as follows:

[0030] Step one, see Figure 1-2 As shown, when the tunnel to be excavated needs to pass through the cave and be dredged and filled with a large karst cave, support piers should be set in groups at the front and rear of the bottom of the tunnel to be excavated, and the front support pier 1 is located at the 2, the rear buttress 3 is located within the filling 4 or surrounding rock 16 of the large karst cave; at least two groups of buttresses are arranged, which are respectively located below the positions of the initial support side walls on both sides of the tunnel.

[0031] Step two, see Figure 1-2 As shown, between each group of corresponding front pier 1 and rear pier 3,...

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Abstract

A method for treating a large fully filled karst cave provided with a deep cave body and excavating a tunnel adopts a three-step seven-procedure method comprising steps of karst cave treatment, pre-grouting, excavation of an upper arc-shaped pilot tunnel, excavation of a middle step, excavation of a lower step and excavation of three steps in the middle. Construction space is large, mechanized construction is convenient, parallel operation on multiple working faces can be realized, and the working efficiency is high; construction procedures can be transformed flexibly and timely, and the construction method can be adjusted; the method is applicable to different spans and various section forms, and primary support procedures are convenient to operate; core soil is reserved on the basis of excavation with the step method, left and right staggered excavation is performed, and stability of excavation working faces is facilitated; when surrounding rock has larger deformation or abrupt change, the closure time can be adjusted as quickly as possible on the premise that safety is guaranteed and a clearance requirement is met, the method is widely applicable to karst cave stratums with special geological conditions, and construction and tunnel safety is guaranteed through rapid, safe and effective tunnel excavation construction under the geological conditions.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/14E21D11/15E21D11/10E21D20/00
CPCE21D9/00E21D9/001E21D11/00E21D11/10E21D11/14E21D11/152E21D20/00
Inventor 李文华杨东波张晗李宁贺美德叶春琳刘波王书云王丽萍赵辉张春发吕嘉刘继尧魏英华柳飞尹鹏涛谭磊
Owner BEIJING MUNICIPAL ENG RES INST
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