Analysis of Surrounding Rock Stability during Blasting  Construction of Tunnel with Thin Bedrock Roof

doi:10.3973/j.issn.2096-4498.2017.11.011

Tunnel Construction ›› 2017, Vol. 37 ›› Issue (11): 1430-1435.DOI: 10.3973/j.issn.2096-4498.2017.11.011

Previous Articles Next Articles

Analysis of Surrounding Rock Stability during Blasting  Construction of Tunnel with Thin Bedrock Roof

DENG E¹, YANG Weichao^{1, 2}, LEI Mingfeng^{1, 2}, YIN Rongshen¹

(1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China; 2. National Engineering Laboratory for High Speed Railway Construction, Central Soath Universty, Changsha 410075, Hunan, China)

Received:2016-11-16 Revised:2017-02-13 Online:2017-11-20 Published:2017-12-09

Abstract

Abstract:

In order to effectively control the safety of tunnel construction under the condition of thin bedrock roof, the vibration velocity distribution characteristics and damage of surrounding rock induced by blasting construction of a expressway tunnel are studied; and then the stability of surrounding rock is analyzed by numerical simulation method. The results show that: 1) When the thickness of tunnel roof is over 5 m, the surrounding rock is stable. 2) When the thickness of tunnel roof is 3 m, serious tensile cracks and some radial cracks would occur at the bedrock roof of the most dangerous crosssection, and which would lead to overbreak. 3) When the thickness of tunnel roof is less than 2 m, radial cracks would penetrate the roof rock, the stability of surrounding rock is poor, and collapse would occur to 1 m behind the tunneling face.

Key words: tunnel blasting, thin bedrock roof, numerical simulation, stability of surrounding rock

CLC Number:

U 45

DENG E, YANG Weichao, LEI Mingfeng, YIN Rongshen. Analysis of Surrounding Rock Stability during Blasting  Construction of Tunnel with Thin Bedrock Roof[J]. Tunnel Construction, 2017, 37(11): 1430-1435.

[1]	ZHANG Mingju, WANG Siqing, LI Pengfei, XU Qing. Analysis of Tunnel Seepage Field Considering Drainage System [J]. Tunnel Construction, 2023, 43(S1): 46-53.
[2]	LI Pengfei, LU Qianqian, GE Chenhe, LIU Teng, WANG Shuo, GUO Yanqi. Analysis of AntiContinuity Failure of DoubleRing Beam Support Structure in Asymmetric Foundation Pit Based on Redundancy Degree [J]. Tunnel Construction, 2023, 43(S1): 109-120.
[3]	LI Pengfei, LI Ze, GE Chenhe, GUO Fei. Deformation Characteristics and Redundancy Analysis of Deep Foundation Pit Excavation in Metro Station Using Covering TopDown Method in Sandy Stratum [J]. Tunnel Construction, 2023, 43(S1): 98-108.
[4]	WANG Ru, ZHAI Wuzhou, NI Haibo, HUANG Hongwei. Numerical Simulation on Mechanical Response of Tunnel Portal with Segment Lining in Mechanized Construction of Cross Passage of Shield Tunnel [J]. Tunnel Construction, 2023, 43(S1): 178-188.
[5]	LIU Hongzhuan, CHEN Zhiwei, YI Zhuangpeng, CHEN Xingye. Wave Loads on LargeScale Wide Tube of Submerged Floating Tunnel During Sinking [J]. Tunnel Construction, 2023, 43(S1): 248-256.
[6]	CHEN Yinji, ZHANG Zhiguo, MU Linlong, CHEN Jie, LU Zheng, CHEN Zhongkan. Numerical Simulation Analysis of Influence of Curved Tunneling on Deformation of Adjacent Strata and Segments [J]. Tunnel Construction, 2023, 43(S1): 271-282.
[7]	JIAO Hongwei. Pollutant Diffusion Law in Relay Ventilation of Long Ventilation Chamber in Wushan Tunnel on ZhengzhouWanzhou HighSpeed Railway [J]. Tunnel Construction, 2023, 43(7): 1127-1138.
[8]	WANG Changhong, ZHANG Haidong, DONG Jihan, LI Fei, HE Hongyuan. HydroThermoMechanical Coupling Study on Freezing Method for Metro Connecting Gallery in Saturated Silt Sand Strata in Nantong, China [J]. Tunnel Construction, 2023, 43(6): 948-958.
[9]	LONG Kaitian, ZHAO Jianhua, GUO Chun. Influence of Middle Partition Wall Structure and CrossSection Type of Parallel Pilot Tunnel on Ventilation Effect [J]. Tunnel Construction, 2023, 43(4): 658-664.
[10]	WANG Jianhui, GAO Meng, WANG Runsheng, YANG Kai, HUANG Changxin, ZHANG Lianzhen, ZHANG Qing, ZHAO Yao, HAN Xu, ZHAO Junyun, WANG Anni, LI Zhipeng, WENG Xianjie. Stability Analysis of Surrounding Rock of Inverse Bench Excavation of Metro Tunnel with Minimal Overburden Thickness [J]. Tunnel Construction, 2023, 43(4): 690-697.
[11]	ZHAO Licai, WANG Rui, , YIN Ke, MA Jiakuan, LI Liangguang. Flow Guide Open Tunnel and Its ColdProof Effect of Tunnel in Seasonal Frozen Regions [J]. Tunnel Construction, 2023, 43(2): 248-256.
[12]	SONG Yuan, HUANG Mingli, ZHANG Xudong, LI Ran. Mechanical Characteristics of Spatial Reticulated Grid Concrete Primary Support in Mined Tunnel [J]. Tunnel Construction, 2023, 43(2): 273-284.
[13]	SUN Ze, SONG Zhanping, YUE Bo, YANG Zifan. Inversion Model for Surrounding Rock Parameters Based on Back Propagation Neural Networks Improved by Stochastic Gradient Descent Algorithm [J]. Tunnel Construction, 2023, 43(12): 2066-2076.
[14]	CHEN Songlin, WANG Lichuan, HU Hengqian, WANG Shuying, YANG Zebin, CHONG Panpan, LU Chuang, CHEN Hongwei. Fault and Fracture Zone Collapse Treatment Technology for Open Tunnel Boring Machine Applied in Beijiang Water Diversion Project [J]. Tunnel Construction, 2023, 43(12): 2122-2132.
[15]	SUN Xingliang, GUO Xuke, SI Nan. Effects of PipeType Hidden Caverns on Tunnel Lining Structure Under Strong Rainfall Conditions [J]. Tunnel Construction, 2023, 43(11): 1831-1841.

Analysis of Surrounding Rock Stability during Blasting  Construction of Tunnel with Thin Bedrock Roof

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments