断层错动对上覆土体及隧道影响的模型试验
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摘要
通过砂箱模型试验,采用FBG传感器,研究隧道距基岩面不同距离时隧道顶部和底部纵向应变变化规律,试验结果表明:随着隧道距基岩面距离的增加,隧道变形极值点的位置向错动迹线左侧区域移动,出现在错动迹线左侧0～15 cm的范围内;在上覆土体厚度一定的情况下,隧道距基岩面距离存在着一个最不利值,该位置的隧道衬砌在断层错动时,被破坏的可能性最大;随着隧道距基岩面距离的增加,断层传播到地表的水平传播距离减小。
Through sandbox modet test,the longitudinal strain of tunnel was measured by FBG sensor when the distance between tunnel and bedrock surface were different.Test results show that with the distance between tunnel and bedrock increases,the position of the maximum point of tunnel deformation moved towards the left of the fault trace,and the maximum point appeared in the zone about 0~15 cm away from the left of the fault trace.When the thickness of overlying soil is constant,there is a most unfavorable distance between tunnel and bedrock,at which tunnel lining is most likely to be destroyed when the fault rupture occurs.As the distance between tunnel lining and bedrock increases,the L-fault rupture of the propagation distance decreases.
Through sandbox modet test,the longitudinal strain of tunnel was measured by FBG sensor when the distance between tunnel and bedrock surface were different.Test results show that with the distance between tunnel and bedrock increases,the position of the maximum point of tunnel deformation moved towards the left of the fault trace,and the maximum point appeared in the zone about 0~15 cm away from the left of the fault trace.When the thickness of overlying soil is constant,there is a most unfavorable distance between tunnel and bedrock,at which tunnel lining is most likely to be destroyed when the fault rupture occurs.As the distance between tunnel lining and bedrock increases,the L-fault rupture of the propagation distance decreases.
引文
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[3]Lin,M.L.,Chung,C.F.,Jeng,F.S..Deformation of overbur-den soil induced by thrust fault slip[J].Engineering Geology,2006(88):70-89.
[4]Lin,M.L.,Jeng,F.S..Response of soil and a submerged tun-nel during a thrust fault offset based on model experiment and numerical analysis.Proceedings of ASME Pressure Vessels and Piping Division Conference,Denver,Colorado USA,Paper No.PVP2005-71179.
[5]Lin,M.L.,Jeng,F.S.,Huang,T.H.,etc.A study on the dam-age degree of shield tunnels submerged in overburden soil dur-ing the thrust fault offset.Proceedings of PVP2006ASME Pres-sure Vessels and Piping Division Conference,Vancouver,BC,Canada,Paper No.PVP2006-ICPV11-93345.
[6]彭建兵.西安城市快速轨道交通二号线穿过地裂缝带的结构措施专题研究[D].西安:长安大学,2007.
[7]张成航.西安地铁隧道穿越地裂缝的模型试验研究[D].西安:长安大学,2008.
[8]熊田芳.地裂缝区间地铁隧道模型试验研究及其新型支护技术[D].西安:西安理工大学,2010.
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