Application method for horizontal V-shaped tunnel face for digging tunnel

An application method and technology of the face, which can be used in tunnels, earthwork drilling, blasting, etc., can solve the problems of high consumption of explosives per unit, large clamping effect, and difficulty in blasting, so as to reduce the unit consumption of explosives and improve the utilization rate. , the effect of reducing the number of holes

Inactive Publication Date: 2009-02-11
SINOHYDRO BUREAU 5
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  • Abstract
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Problems solved by technology

When blasting with a flush face, it is greatly affected by the clamping effect of

Method used

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  • Application method for horizontal V-shaped tunnel face for digging tunnel
  • Application method for horizontal V-shaped tunnel face for digging tunnel

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Embodiment Construction

[0015] The present invention will be explained in more detail below in conjunction with the accompanying drawings.

[0016] A method for applying a horizontal V-shaped face in tunnel excavation, the steps of which are as follows:

[0017] 1) Determine the drill hole diameter B value;

[0018] 2) Determine the drilling depth L value and the inclination depth L1 of the V-shaped tunnel face according to the slag discharge equipment and construction schedule;

[0019] 3) Determine the cutting method according to the hardness of the rock;

[0020] 4) According to the cutting method, rock hardness, joint development, and drilling depth L, determine the value of the inclination angle a of the V-shaped tunnel face;

[0021] 5) Cutting according to the drilling diameter B, drilling depth L, inclination depth L1 of the V-shaped face, the value of the in-bevel angle a of the V-shaped face, and the selected cutting method;

[0022] 6) After the cutting is completed, the blasting operat...

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Abstract

The present invention relates to a construction method for using a horizontal V-shaped tunnel face during tunneling. In the method, the value of bore diameter B is confirmed firstly; then the value of bore depth L and the V-shaped tunnel face inner oblique depth L1 are confirmed according to the arrangement of tapping equipments and construction schedule; an undercutting form is confirmed according to the rock hardness; the value of the V-shaped tunnel face inner oblique angle a is confirmed according to the undercutting form, the rock hardness, the joint development condition and the bore depth L; and finally, blasting operation is conducted after undercutting according to the bore diameter B, the bore depth L, the V-shaped tunnel face inner oblique depth L1, the V-shaped tunnel face inner oblique angle a and the selected undercutting form. The present invention improves the utilization rate of the blast bore greatly, reduces the waste of explosive and the quantity of bores and ensures that the single circulation drilling footage is possible to exceed the bore depth. The waste of explosive and the quantity of bores are reduced, so the cost is reduced greatly.

Description

technical field [0001] The invention relates to a construction method for tunnel excavation, in particular to a construction method for horizontal V-shaped tunnel faces used in tunnel excavation. Background technique [0002] For a long time, tunnel excavation has always used a flush face, and the size and number of free faces have a significant impact on the blasting effect. When blasting with a flush face, it is greatly affected by the clamping effect of rocks, making blasting difficult and the consumption of explosives per unit high. Contents of the invention [0003] In view of the above problems, the present invention discloses an application method of a horizontal V-shaped tunnel face in tunnel excavation. The method steps are as follows: [0004] 1) Determine the drill hole diameter B value; [0005] 2) Determine the drilling depth L value and the inclination depth L1 of the V-shaped tunnel face according to the slag discharge equipment and construction schedule;...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/10F42D3/00
Inventor 杨玉银梁涛于永
Owner SINOHYDRO BUREAU 5
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