Study of Reinforcement Parameters of Fiberglass Bolts for the Large Cross-section Tunnel Working Face in Xigeda Formation
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2 China Railway Eryuan Engineering Group Co., Ltd., Chongqing 610031)
Abstract：
Due to poor water stability of the Xigeda formation, its engineering property will deteriorate quickly up?
on encountering water. The tunnel construction activities in the Xigeda formation may induce large deformation of surrounding rocks and collapse of tunnel face. The reinforcement parameters on the face of large-section tunnel in Xigeda formation were studied by numerical simulation and theoretical analysis based on ADECO-RS and the Tongzilin tunnel project on Chengdu-Kunming railway, and it determines that distribution density of bolts is 0.65 every square meter, the reasonable reinforcement length of bolts is 8-11 meters based on longitudinal failure depth, established failure mode of unstable tunnel face in Xigeda formation, with the lap length of bolt is 4 m on the basis of distribution depth of plastic zone in front of tunnel face.
WANG Zhijie1 YANG Bao1,
2 GAO Jingyao1 ZHOU Ping1
.Study of Reinforcement Parameters of Fiberglass Bolts for the Large Cross-section Tunnel Working Face in Xigeda Formation[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(2): 92-97
2019, Vol. 56 