大断面隧道轮廓控制爆破技术研究与应用

doi:10.11872/j.issn.1005-2518.2019.03.350

Abstract

Abstract:

With the general trend of tunnel construction in China towards large and super-large sections，the application of full-face blasting excavation method in tunnel excavation generally has the problems of poor contour forming effect，low trace rate of blasting holes and large under or over excavation.The technology of full section blasting with pre-arranged layer and the technology of detonating peripheral hole with triangular lap of detonating cord can effectively solve the above problems and achieve good contour forming effect.The two kinds of blasting modes are introduced and compared，and the corresponding engineering application conditions are given in this paper.The advantages of the full section blasting technology with pre-arranged layer are analyzed，and the calculation formula for the parameters of the pre-arranged layer is given.The detonating mechanism of triangular lap of detonating cord is analyzed.The theoretical calculation of the blasting time is calculated，and as a result,the detonation signal can be transmitted to the whole blasting network in 5 ms，and the maximum detonating time difference between adjacent blast hole is less than 1ms.Based on the Dong Tianshan tunnel project，the field tests of two kinds of blasting modes have been carried out.The results show that both modes can effectively control the contour of the excavation section，improve the hole trace rate and reduce the over excavation.The applicable conditions of the two modes are as follows：The technology of full section blasting with pre-arranged layer can be used under the good condition of Ⅳ class surrounding rock and above grade Ⅲ surrounding rock；The technology of detonating peripheral hole with triangular lap of detonating cord can be applied under the poor condition of Ⅳ class surrounding rock and Ⅴ surrounding rock.The results can provide reference for similar projects.

Key words: large section tunnel, pre-arranged layer, triangular lap of detonating cord, contour control technology, smooth blasting, full section

CLC Number:

TD235.374

Qiyue LI,Xinhao ZHAO,Xin’ao WEI,Jing ZHENG,Jianqiu ZHANG. Study and Application of Contour Control Blasting Technology for Large Section Tunnel[J].Gold Science and Technology, 2019, 27(3): 350-357.

Figures/Tables 15

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爆破次数	平均线性超挖量/m	炮孔痕迹率/%
平均值	0.205	91.1
1	0.154	95
2	0.209	92
3	0.147	89
4	0.257	91
5	0.185	85
6	0.232	93
7	0.256	94
8	0.204	90

爆破次数	平均线性超挖量/m	炮孔痕迹率/%
平均值	0.238	88.5
1	0.241	85
2	0.258	92
3	0.276	88
4	0.179	83
5	0.234	90
6	0.245	93

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Study and Application of Contour Control Blasting Technology for Large Section Tunnel

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