Deep-hole backward grouting and water-blocking construction method for igneous rock water-rich fault

A construction method and a backward-type technology, applied in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve problems such as difficulty in achieving effective results, and achieve the effect of ensuring rapid construction, good continuity and obvious economic benefits

Inactive Publication Date: 2020-01-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

Therefore, it is difficult to achieve better resu...

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  • Deep-hole backward grouting and water-blocking construction method for igneous rock water-rich fault
  • Deep-hole backward grouting and water-blocking construction method for igneous rock water-rich fault
  • Deep-hole backward grouting and water-blocking construction method for igneous rock water-rich fault

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Embodiment Construction

[0024] Combine below figure 1 , figure 2 , image 3 To further explain the present invention:

[0025] When tunneling through igneous rock (mainly granite) in a certain area of ​​Qinling Mountains encounters difficulty in blocking water in the fracture zone of water-rich faults, a deep hole retreat grouting construction method for water-rich faults in igneous rock is provided. The specific steps are as follows:

[0026] 1) According to the geological data, when the tunnel excavated by smooth blasting is driven to about 50m in front of the fault fracture zone 6, the advanced drilling hole is used to detect the occurrence of the fault in front of the tunnel face 5 and the underground water inflow and water pressure. In this case, the advance drilling holes are arranged in a fan shape, the diameter of the drilling holes is 50mm, and the number of exploration holes is 5, which are distributed axisymmetrically. The angle between the external oblique eye and the middle eye is 3°-6°, and ...

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Abstract

The invention discloses a deep-hole backward grouting and water-blocking construction method for an igneous rock water-rich fault. An advance exploratory drilling technology is adopted to prove a fracture zone of the water-rich fault, after deep-hole backward advanced pre-grouting and primary water blocking, tunneling construction is quickly conducted to pass through the fracture zone of the fault, and in a tunnel area of a water-rich section, full-face deep-hole backward little tremie grouting and secondary water blocking is adopted. According to the characteristics that the fracture zone ofthe igneous rock fault is large in fracture aperture and high in connectivity, the deep-hole backward grouting method is adopted to change the way that a little tremie conducts segmented grouting at the positions of grouting holes from far to near in the order of I, II, III, IV......, the grout on the upper stage is deposited and solidified to achieve an enhancing effect on deposition and solidification of the grout on the next stage, finally, cracks are sufficiently filled with the grout, the water-blocking aim is achieved, the problem that in the prior art, igneous rock tunnel construction is conducted to pass through the water-rich fault, water is difficult to block is solved, and the full-face deep-hole backward grouting method is provided for the difficulty of grouting and water blocking in the process that tunnel construction is conducted to pass through the fracture zone of the water-rich fault in the igneous rock.

Description

Technical field [0001] The invention relates to the field of tunnel construction, in particular to a deep hole retreat type grouting and water blocking construction method aimed at igneous rock water-rich faults. Background technique [0002] In general, tunnel waterproofing and drainage follow the combination of "prevention, drainage, interception, and blockage", and comprehensive treatment according to local conditions can ensure the normal use of tunnel structures and operating equipment and the safety of tunnel traffic. However, when the tunnel construction encounters the water-rich fault geological structure, that is, the fault that the tunnel passes through is connected to the aquifer or water area, large water gushing will be generated at the connection, which is easy to submerge the face, even when a high-power water pump is used Drainage still cannot guarantee the dryness of the tunnel surface, which not only affects the construction schedule, but also brings hidden dang...

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Application Information

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IPC IPC(8): E21D11/10E21F15/00E21D11/38
CPCE21D11/10E21D11/38E21F15/00
Inventor 郤保平辛国旭吴阳春李晓雪何水鑫成泽鹏
Owner TAIYUAN UNIV OF TECH
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