Dynamic strain test and measurement of a tunnel in nearby blasting vibration
LUO Chi1,2,YANG Xin’an1,2,LI Kun3,WANG Bin4,XIAO Chengyi3
1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;
2.College of Transportation Engineering, Tongji University, Shanghai 201804, China;
3.China Railway NO.5 Engineering Group Co., Ltd., Changsha 410007, China;
4.The Fourth Company of China Railway NO.5 Engineering Group Co., Ltd., Shaoguan 512031, China
Abstract:The dynamic strain test of a tunnel in blasting vibration could directly reflect the stress condition of the rock mass and supporting structures, understands the disturbance situation of blasting impact on the surrounding rock and supporting structures and has important significance to the tunnel under nearby blasting.Based on the project of the Badalingchangcheng station of Jingzhang high-speed railway, by using the measures of vibration protection and joint reinforcement of the testing system to improve the test environment, the blasting dynamic strain of the primary tunnel support was measured accurately, and the distribution of tunnel blasting dynamic strain was acquired both at the blasting side and at the opposite side of the tunnel and both in longitudinal and in circumferential directions.By monitoring the vibration velocity in blasting, the correlation between the blasting dynamic strain and vibration velocity was investigated, based on which a method for determining the permissible vibration velocity standard of under-construction tunnel structures was put forward.The results show that it is feasible and reliable to test the dynamic strain of the under-construction tunnel directions.The dynamic strain of primary tunnel lining at the blasting side is larger than that at its opposite side.The circumferential dynamic strain is larger than the longitudinal strain and the longitudinal dynamic strain nearby the tunnel intersection is increasing significantly.There is a positive linear correlation between the blasting vibration velocity and dynamic strain, namely, the higher the dynamic strain is, the higher the vibration velocity is.The method can be used to determine the permissible vibration velocity of tunnel structures under construction and provide a reference to the blasting vibration protection of under-construction tunnels.
罗驰1,2,杨新安1,2,李坤3,王斌4,肖承倚3. 隧道近区爆破振动动应变测试及其应用[J]. 振动与冲击, 2020, 39(2): 262-268.
LUO Chi1,2,YANG Xin’an1,2,LI Kun3,WANG Bin4,XIAO Chengyi3. Dynamic strain test and measurement of a tunnel in nearby blasting vibration. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(2): 262-268.
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