Treatment method for annularly continuous bead-like karst caves of tunnel

A treatment method and karst technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of roof collapse, poor effect, complexity, etc., and achieve the effect of compact construction period, convenient construction, economical and reasonable effect

Active Publication Date: 2017-01-25
NO 4 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY
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Problems solved by technology

[0002] With the implementation of the “One Belt, One Road” plan, the expressways in the southwest region have entered a period of rapid development. The rock and soil conditions in the southwest region are typical karst landforms, and the integrity of the karst landform is poor. Developed, there are many interlayers, the rock has no roots, and is only fixed by the friction between the rocks, which is very prone to loosening and falling blocks, and the risk of roof collapse
Beaded karst caves are more dangerous and complex than other forms of karst caves, especially for karst caves that appear continuously in the circular direction within the same mileage section. Safety, schedule and efficiency create difficulties
[0003] Especially the karst caves in the vault need to be closed in the early stage, so the principle of the vault karst cave treatment is safety first, early closure, lightness, high strength, and easy construction. The previous design is completely filled, or concrete is used for vertical The method of molding the arch protection is time-consuming, laborious, poor in effect, and difficult to construct

Method used

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with embodiment:

[0037] The treatment method of beaded circular continuous karst caves in karst landform tunnels is aimed at the three beaded karst caves in the vault, left arch foot and right arch waist of tunnels with structural erosion and low-mountain landforms. There are connections between the karst caves. , the method is as follows:

[0038] (1) Emergency measures:

[0039] ①Strictly control the excavation footage

[0040] Due to the extremely complicated geological conditions of this section, it is impossible to effectively ascertain the integrity and strength of the rock ahead and the development of cracks, so the excavation footage must be strictly controlled, and excavation shall be carried out at intervals of one block each time;

[0041] ②Accurate advance forecast

[0042] Carry out advanced drilling confirmation in the beaded karst cave development area, and carry out sampling drilli...

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Abstract

The invention provides a treatment method for annularly continuous bead-like karst caves of a tunnel. The method comprises steps of execution of emergency treatment measures, primary support treatment of vault caves, primary support treatment of left-skewback caves and primary support treatment of right-hance caves. The treatment method for the annularly continuous bead-like caves of the tunnel is safe, reliable, scientific, feasible, convenient to construct, economical and reasonable, solves the technical problems in construction of the bead-like caves while the construction duration is short, provides reference for follow-up similar cave treatment especially treatment of the vault caves, and realizes the effects of saving time and labor and facilitating construction.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for treating beaded circular continuous karst caves in karst landform tunnels. Background technique [0002] With the implementation of the “One Belt, One Road” plan, the expressways in the southwest region have entered a period of rapid development. The rock and soil conditions in the southwest region are typical karst landforms, and the integrity of the karst landform is poor. There are many interlayers, the rocks have no roots, and are fixed only by the friction between the rocks, which is very prone to loosening and falling blocks, and the risk of roof collapse. Beaded karst caves are more dangerous and complicated than other forms of karst caves, especially for karst caves that appear continuously in the circular direction within the same mileage section, the development of surrounding rocks is unknown, and secondary development is prone to occur. Safety, schedul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E21D11/10
CPCE02D3/00E21D11/10
Inventor 杭宝国李祯邱中原范长青杨龙龙
Owner NO 4 ENG COMPANY LTD OF CCCC FIRST HARBOR ENG COMPANY
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