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Construction method for excavating tunnel through combined application of high-pressure water splitting and forming and drilling and blasting method

A technology for combined application and tunnel excavation, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of prolonging the construction period, increasing the construction cost, and the blasting impact force is large, and achieves a simple construction process and saves construction costs. , the effect of improving work efficiency

Inactive Publication Date: 2017-06-20
CHINA RAILWAY LIUYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This construction method has the following problems in the actual operation process: due to the strong impact of blasting, the actual blasting surface of the rock formation often spreads along the direction of the rock formation to the depth of the rock formation, resulting in large excavation and over-excavation phenomena. The inner surface of the tunnel is set along the fracture surface of the rock strata, and the surface is not smooth. The amount of backfilling in the later lining will be large, which will increase the construction cost and prolong the construction period.

Method used

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  • Construction method for excavating tunnel through combined application of high-pressure water splitting and forming and drilling and blasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a construction method for excavating tunnels with the combined application of high-pressure water splitting and drilling and blasting is carried out in accordance with the following steps:

[0027] (1) Determine the excavation tunnel boundary 3 according to the design requirements;

[0028] (2) Boundary holes 1 are drilled at a certain distance along the tunnel design boundary 3. Boundary holes 1 are uniformly arranged along the tunnel boundary 3. The hole depth of boundary holes 1 is 2m, and the distance between boundary holes 1 is 1.0m. 1 has a diameter of 8cm;

[0029] (3) Inject high-pressure water into the boundary hole 1, the water pressure of which is 30MPa, use high-pressure water to cause cracks in the surrounding rock formations of the boundary hole 1, and form surrounding connecting cracks along the tunnel boundary 3;

[0030] (4) In the face of the tunnel, drill and blast method is used to excavate the rock mass inside the design...

Embodiment 2

[0034] Such as figure 1 As shown, a construction method for excavating tunnels with the combined application of high-pressure water splitting and drilling and blasting is carried out in accordance with the following steps:

[0035] (1) Determine the excavation tunnel boundary 3 according to the design requirements;

[0036] (2) Boundary holes 1 are drilled at a certain distance along the tunnel design boundary 3. Boundary holes 1 are evenly arranged along the tunnel boundary 3. The hole depth of boundary holes 1 is 3.5m, and the hole spacing between boundary holes 1 is 0.6m. The diameter of hole 1 is 10cm;

[0037] (3) Inject high-pressure water into the boundary hole 1. The water pressure of the high-pressure water is 200MPa. The high-pressure water is used to crack the rock formation around the boundary hole 1, and form surrounding connecting cracks along the tunnel boundary 3;

[0038] (4) In the face of the tunnel, drill and blast method is used to excavate the rock mass...

Embodiment 3

[0042] Such as figure 1 As shown, a construction method for excavating tunnels with the combined application of high-pressure water splitting and drilling and blasting is carried out in accordance with the following steps:

[0043] (1) Determine the excavation tunnel boundary 3 according to the design requirements;

[0044] (2) Boundary holes 1 are drilled at a certain distance along the tunnel design boundary 3. Boundary holes 1 are evenly arranged along the tunnel boundary 3. The hole depth of boundary holes 1 is 3m. 1 has a diameter of 5cm;

[0045] (3) Inject high-pressure water into the boundary hole 1, the water pressure of which is 100MPa, use high-pressure water to crack the rock formation around the boundary hole 1, and form surrounding connecting cracks along the tunnel boundary 3;

[0046] (4) In the face of the tunnel, drill and blast method is used to excavate the rock mass inside the design boundary, and the detonation hole 2 is drilled inside the excavation tu...

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Abstract

The invention belongs to the field of tunnel and underground engineering construction, and particularly relates to a construction method for excavating a tunnel through combined application of high-pressure water splitting and forming and a drilling and blasting method. The construction method is characterized by conducting according to the following steps that (1), according to the design requirements, a boundary of the tunnel to be excavated is determined; (2), drilling is conducted along the designed boundary of the tunnel according to a certain hole distance; (3), high-pressure water is injected into boundary holes, a rock stratum around the boundary holes is cracked by utilizing the high-pressure water, and a crack with the periphery communicating is formed along the boundary of the tunnel; (4), the tunnel is excavated according to the combined application of high-pressure water splitting and forming and the conventional drilling and blasting method, namely, a rock mass inside the designed boundary is excavated in the tunnel driving face through the blasting method; and (5), after drilling and blasting, the inner wall of the tunnel is exposed along the excavated tunnel, and blasting residues are cleaned. By using the high-pressure water, the penetrating crack is formed around the rock stratum of the boundary of the tunnel, the forming face of the tunnel inner surface is smooth, and lining and backfilling in the later period are not needed, so that the construction cost is saved, and the construction period is shortened.

Description

technical field [0001] The invention belongs to the field of tunnel and underground engineering construction, and in particular relates to a construction method for excavating a tunnel by combining high-pressure water splitting and drilling and blasting. Background technique [0002] With the development of my country's urban rail transit construction, more and more cities have begun to carry out subway construction, and the excavation volume of underground tunnels is also increasing. Drilling and blasting tunnel construction has the following advantages: 1. It is suitable for various geological conditions and groundwater conditions; 2. It has high flexibility for various cross-section forms and changing cross-sections; 3. Through partial excavation and auxiliary construction methods, it can effectively Control surface subsidence and collapse; 4. Compared with the shield method, it is also economical to use in shorter excavation sections; 5. Compared with the tunneling machi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
CPCE21D9/006
Inventor 徐韬贺维国杜道龙高菊英张笑可许亚军徐彦举
Owner CHINA RAILWAY LIUYUAN GRP CO LTD