Tunnel smooth blasting method

A smooth blasting and tunneling technology, applied in blasting and other directions, can solve problems such as delaying construction time, high explosive consumption, and reducing half-eye rate, etc., and achieve the effects of less explosive consumption, controllable footage, and high half-eye rate

Active Publication Date: 2015-04-01
CHINA RAILWAY 23RD CONSTR BUREAU LTD
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Problems solved by technology

[0004] In this field in China, construction companies with controllable footage are rarely heard of. Generally, when the footage is above 2m, the explosive consumption will reach 3kg/m 3 Left and righ

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Embodiment 1

[0032] This embodiment takes the smooth blasting of the construction of the Shushui East Diversion Tunnel in Rizhao City, Shandong Province as an example. There are rivers diverting water to Rizhao Reservoir to realize the rational allocation of regional water resources and solve the problem of water shortage in Rizhao City. The total length of the water conveyance tunnel is 18.368km, the design flow rate is 10m3 / s, and the non-pressure flow is adopted. The tunnel is a city gate type. The excavation section is 4.1×3.3m plus a semi-circular arch. The cross-sectional area is 20.13m2, and the diameter of the semi-circular arch is 4.1m. The central angle is 180°, and the tunnel bottom gradient is 1 / 2854. Type II and III surrounding rocks are supported by bolts, hanging net sprayed concrete, and Type IV and V surrounding rocks are supported by steel frames, anchor bolts, hanging net sprayed concrete + reinforced concrete lining.

[0033] The surface terrain of the tunnel is quite ...

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Abstract

The invention relates to the field of tunnel smooth blasting, in particular to a tunnel smooth blasting method. The effect of the method in a small cross-section tunnel is particularly outstanding. The method includes the steps: firstly, selecting smooth blasting parameters; secondly, determining a slotting mode and finishing slotting; thirdly, installing explosive and performing blasting. Smooth blasting holes are formed along a tunnel face boundary, inner ring holes are formed in the inner sides of the smooth blasting holes, the distance between each inner ring hole and the corresponding smooth blasting hole is equal to the thickness of a smooth blasting layer, combination of the first step and the second step includes a first mode, slotting thickness is 2.8m in the first step, slotting is performed in an inclined hole slotting mode in the second step, slotting holes are vertically and symmetrically formed in two sides of a symmetrical center line of a tunnel face, auxiliary holes are formed in a semicircular portion of the tunnel face in an arc-shaped mode, midpoints of the auxiliary holes are positioned on the symmetrical center line of the tunnel face, and auxiliary holes are further formed among the slotting holes and the inner ring holes. The tunnel smooth blasting method is high in half hole rate, controllable in footage and less in explosive consumption.

Description

technical field [0001] The invention relates to the field of tunnel smooth blasting, in particular to a tunnel smooth blasting method, which has a particularly prominent effect on small-section tunnels. Background technique [0002] The smooth blasting technology of tunnels such as highways and railways has been relatively mature, especially the smooth blasting technology of large-section tunnels. However, the blasting parameters of small-section tunnels (hereinafter referred to as tunnels) are quite different from those of large-section tunnels, and cannot be directly applied. During tunnel construction, Short blasting footage and high explosive consumption have always been the most difficult points in the construction of small-section tunnels. It is very difficult to control the cutting method, cutting angle adjustment, and blasthole layout optimization; [0003] It specifically includes parameters such as uncoupling coefficient, optical blasting hole density coefficient, ...

Claims

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Application Information

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IPC IPC(8): F42D3/04F42D1/00
Inventor 张星田宝华陈幼林李锦峰张斌刘养涛石绍志姜潇宋国勇申言福刘延龙
Owner CHINA RAILWAY 23RD CONSTR BUREAU LTD
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