Controlled blasting technique for small-clear-distance tunnel construction

A technology for controlling blasting and tunnel construction. It is applied in blasting and other directions. It can solve the problems of affecting the stability of surrounding rock, the safety of adjacent tunnels, the lack of construction personnel for construction, and the poor flexibility of construction plans, so as to improve the utilization rate of blast holes and ensure the construction progress. , the effect of protecting stability

Inactive Publication Date: 2010-08-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on tunnel excavation and blasting technology in China mainly focuses on cutting blasting technology, peripheral hole blasting technology, non-cutting excavation blasting technology and tunneling blasting technology when tunnel passes through surface buildings (Fang Junbo, Cui Tianlin. Shallow-buried subway section Impact of Blasting Vibration on Surface Structures [J] World Tunnel. 2000(5): 28~31), (Zhu Zebing, Zhang Dongming. Control of Blasting Vibration in Daping Tunnel Excavation [J]. Engineering Blasting. 2002, 8(4): 65~70), (Dai Qinrong, Li Liangyun. Controlled Blasting Construction Technology of Yanjin No. 1 Tunnel of Nei-Kunming Railway [J] World Tunnel (Supplement). 2000: 316~322),

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  • Controlled blasting technique for small-clear-distance tunnel construction
  • Controlled blasting technique for small-clear-distance tunnel construction

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Embodiment 1

[0020] A controlled blasting technology for tunnel construction with small clear distance. The shortest distance between the two centers of the construction tunnel and the existing tunnel is 8-15m. The controlled blasting technology adopted in this embodiment is as follows: first step, according to the safety requirements of the adjacent tunnel, determine the safety standard of blasting vibration as 3-5 cm / s; Differential control blasting, as shown in Fig. 1, first excavates the first step, i.e. the upper step I, with a length of 5-10 m. The excavation adopts shallow-eye differential control blasting, and then successively excavates the second lower step II and the second step II. Excavation is carried out on the third step III, and the excavation length is 5-10m. The excavation also adopts shallow-eye differential control blasting; the third step is to repeat the second step until the entire construction of the tunnel is completed.

[0021] The control blasting parameters ar...

Embodiment 2

[0031] A controlled blasting technology for tunnel construction with small clear distance. The shortest distance between the construction tunnel and the two centers of the existing tunnel is 15-25m.

[0032] The control blasting parameters are:

[0033] The maximum single-stage drug dose is 5-6kg;

[0034] The blasting cycle footage is 0.9~1m;

[0035] The hole spacing E is (10-15)D.

[0036] All the other are with embodiment 1.

Embodiment 3

[0038] A controlled blasting technology for tunnel construction with small clear distance. The shortest distance between the construction tunnel and the two centers of the existing tunnel is 25-35m.

[0039] The control blasting parameters are:

[0040] The maximum single-stage drug dose is 5.5-7kg;

[0041] The blasting cycle footage is 1.0-1.2m;

[0042] The hole spacing E is (15-20)D.

[0043] All the other are with embodiment 1.

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Abstract

The invention relates to a controlled blasting technique for small-clear-distance tunnel construction. The invention adopts a technical scheme comprising the following: step 1, determining that the safety standard of blasting vibration is 3 to 5 cm/s according to safety requirements of adjacent tunnels or buildings (structures); step 2, performing excavation shallow-hole multi-cycle micro-differential controlled blasting on a construction tunnel according to three steps, namely, to excavate a first step I in an excavation length of 5 to 10 meters by adopting shallow-hole micro-differential controlled blasting and then to successively excavate a second step II and a third step III in an excavation length of 5 to 10 meters by adopting shallow-hole micro-differential controlled blasting as well; and step 3, repeat the step 2 until all tunnel construction is finished. The technique has the characteristics of effectively protecting the stability of surrounding rock and the safety of adjacent tunnels or buildings (structures) and ensuring construction progress and construction safety.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering blasting, and in particular relates to a blasting technology for tunnel construction control with a small clear distance. Background technique [0002] With the acceleration of my country's urbanization process and the large-scale development of transportation infrastructure, many cities have started a new round of construction of subway projects, civil air defense projects and urban light rail projects; at the same time, a large number of single-track tunnels need to build second-track tunnels, or New line tunnels need to be built as parallel double lines. These projects often inevitably need to be constructed near existing buildings (structures), or pass under some important surface buildings (structures). In the construction of these projects, as a main construction method, the selection of blasting parameters and the determination of construction technology of tunnel excavation...

Claims

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Application Information

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IPC IPC(8): F42D3/04
Inventor 钟冬望余刚陈浩磨季云姜翠香韩芳吴亮陈江伟陈桂娟胡卫华梁炫王难烂
Owner WUHAN UNIV OF SCI & TECH
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