隧道近区爆破振动动应变测试及其应用

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (2) : 262-268.

论文

隧道近区爆破振动动应变测试及其应用

罗驰1,2，杨新安1,2，李坤3，王斌4，肖承倚3

作者信息 +

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

Author information +

文章历史 +

摘要

隧道爆破振动动应变测试可以直接反映岩体或支护结构的应力状况，明确爆破冲击对隧道围岩及支护结构的扰动情况，对隧道近区爆破有重要意义。以京张高铁八达岭长城站项目为依托，通过对测试系统的减振保护和连接加固来改进现场爆破动应变测试环境，较准确地测出现场隧道初期支护的爆破振动动应变，给出隧道爆破动应变在隧道迎爆侧及背爆侧、隧道环向及纵向的分布规律。结合爆破振速监测，研究爆破动应变与振速的相关性，提出一种在建隧道结构允许振动速度标准的确定方法，该方法基于现场实测得到爆破动应变与振速的相关性及隧道结构允许动应变来计算确定。研究表明：隧道初期支护现场爆破振动动应变测试是可行和可靠的；隧道初期支护迎爆侧的动应变比背爆侧大，沿隧道环向的动应变比沿隧道纵向大，隧道交叉口区域的纵向动应变显著增大；爆破振动速度与动应变存在较好的正线性相关性，即动应变越大，振动速度越高；该方法能确定在建隧道结构的允许振动速度，并为在建隧道的爆破振动保护提供参考。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2020, 39(2): 262-268

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