Combined advanced drilling exploration method for detecting water-free dissolving cavity and water dissolving cavity in tunnel

A water-soluble cavity and tunnel technology, which is applied in tunnels, surveys, earthwork drilling and mining, etc., to achieve the effect of simple methods

Active Publication Date: 2012-12-12
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The Chinese invention patent whose publication number is CN101586470A discloses a kind of advanced drilling method for high-pressure water-rich filling dissolution cavity, and the Chinese invention patent whose publication number is CN101672197A discloses a treatment method for high-pressure water-rich filling dissolution cavity. It is a drilling and treatment method for water-rich dissolved cavities, and there are certain limitations in the construction of karst tunnels

Method used

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  • Combined advanced drilling exploration method for detecting water-free dissolving cavity and water dissolving cavity in tunnel
  • Combined advanced drilling exploration method for detecting water-free dissolving cavity and water dissolving cavity in tunnel
  • Combined advanced drilling exploration method for detecting water-free dissolving cavity and water dissolving cavity in tunnel

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Experimental program
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Effect test

Embodiment 1

[0041] combine figure 1 , 2 And the combined drilling method of table 1,2,3 detection general karst section, this method comprises the following steps:

[0042] 1) Firstly, according to the geological survey results, comprehensively analyze and judge the karst development in front of the tunnel and the possible geological risks, and carry out construction geological advance forecast classification;

[0043] 2) Drill hole A ahead of time in the direction of the tunnel to be excavated. In the process of drilling hole A, when the drill bit penetrates the solution cavity and reaches 5m of the complete bedrock, stop drilling, or when the drill bit drills to the bottom and still has no Stop drilling when drilling through the solution cavity;

[0044] 3) Drill 5 drilling holes along the face of the tunnel facing the direction of the tunnel to be excavated, and then excavate the tunnel forward under the protection of the safety rock plate of the drilling holes. Stop tunneling when ...

Embodiment 2

[0050] combine image 3 , 4And table 1, 2, 3 detect the combined drilling method of karst more developed section, this method comprises the following steps:

[0051] 1) Do a good job in the relevant preparations for drilling water out, prevent the drilling from flooding the tunnel, and install the orifice pipe;

[0052] 2) Drill 3 exploration holes A ahead of the tunnel facing the direction of the tunnel to be excavated, and stop drilling when the water comes out of the dissolution cavity;

[0053] 3) Install a high-pressure water stop valve and a pressure gauge on the probe hole A, and seal the hole after monitoring the water pressure change in the borehole;

[0054] 4) Drill 11 drilling holes along the face of the tunnel facing the direction of the tunnel to be excavated, and then excavate the tunnel forward under the protection of the safety rock plate of the drilling holes. The drilling holes and excavation tunnels are cycled until the drilling holes Stop tunneling when...

Embodiment 3

[0062] combine Figure 5 , 6 And the combined drilling method of table 1, 2, 3 detection karst development section water-bearing solution cavity, it is characterized in that, this method comprises the following steps:

[0063] 1) Do a good job in the relevant preparations for drilling water out, prevent the drilling from flooding the tunnel, and install the orifice pipe;

[0064] 2) Drill 5 exploration holes A ahead of the tunnel facing the direction of the tunnel to be excavated, and stop drilling when the water comes out of the dissolution cavity;

[0065] 3) Install a high-pressure water stop valve and a pressure gauge on the probe hole A, and seal the hole after monitoring the water pressure change in the borehole;

[0066] 4) Drill 17 drilling holes along the face of the tunnel facing the direction of the tunnel to be excavated, and then excavate the tunnel forward under the protection of the safety rock plate of the drilling holes. Stop tunneling when the edge of the ...

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Abstract

The invention discloses a combined advanced drilling exploration method for detecting a water-free dissolving cavity and a water dissolving cavity in a tunnel. The method comprises the following steps of: comprehensively analyzing and judging a karst growth condition and a probable geologic risk in front of the tunnel according to geologic exploration result information, and performing advanced forecast grading on construction geology; performing primary advanced drilling and exploration in a tunnel digging direction of a tunnel face to form a hole A, then performing primary drilling and brazing exploration in the tunnel digging direction, steadily and forwards digging, and cyclically pushing a drilling and brazing exploration hole until the drilling and brazing exploration hole reaches a reserved safe rock disk away from the dissolving cavity; performing drilling exploration to form a hole B in the tunnel digging direction of the tunnel face at the reserved safe rock disk; and comprehensively analyzing, and submitting advanced geologic forecast result information. The method is simple, practical and quick; the test result is reliable; safety prewarning is supplied to great geologic risks such as water burst, sludge burst and deformation collapse; longitudinal section diagrams, cross section diagrams and planar diagrams of ahead dissolving cavities are supplied to tunnel design and construction treatment; and scientific basis is supplied to optimization of the lining section style of the tunnel and supporting and protecting parameters.

Description

technical field [0001] The invention relates to the field of tunnels and underground engineering, in particular to a combined advanced drilling method for detecting anhydrous and water-dissolved cavities in tunnels. Background technique [0002] When tunnel construction encounters karst cavities, there are high geological risks such as large-scale water inrush, mud inrush, and deformation and landslides. Accurate and advanced detection of various karst cavities in the tunnel is a key factor restricting the success of tunnel construction. [0003] According to the different risk levels of tunnel construction, the dissolution chamber can be divided into water dissolution chamber and dry dissolution chamber. Among them, there are water-soluble chambers and can be divided into water-rich chambers and seasonal water-soluble chambers. The water-rich dissolution cavity means that there is always water in the dissolution cavity regardless of the dry season or the rainy season, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/10E21B47/00E21B49/00E21F17/18
Inventor 陈爱云刘坡拉顾湘生曾强运刘洋姚建伟何剑宏徐新祥
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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