【摘要】 强震在合适的条件下会引起地表破裂而对工程造成损坏,避开发震断层引起的地表破裂带是工程选址的重要内容之一。研究采用土工离心模拟技术,在100g超重力环境下成功模拟了逆断层错动过程,得到了基岩不同位错时上覆土层为40 m厚度的干砂和湿砂场地地表变形演化特征,依据试验结果将地表变形过程划分为整体抬升期、隆起变形期、陡坎平移期和变形减缓滞期四个阶段,最终给出强震地表破裂避让距离的建议值。针对这一问题开展的试验研究及有关成果,对认识和研究隐伏逆断层错动引起的土体变形及确定发震断层地表破裂的避让距离等具有重要的理论和实际意义。更多还原

【Abstract】 Under suitable conditions, strong earthquake can cause surface rupture and damage to projects. Avoiding a surface rupture zone caused by seismogenic fault is one of important contents of project site selection. Here, based on the geotechnical centrifugal simulation technology, the process of reverse fault dislocation was successfully simulated in 100g centrifugal field, and surface deformation evolution characteristics of 40 m thick dry sand and wet sand sites during bedrock having different dislocations were obtained. According to test results, the surface deformation process was divided into 4 stages including whole uplift stage, uplift deformation one, scarp translation one and deformation mitigation lag one. Finally, the recommended value of ground surface rupture avoidance distance for strong earthquakes was given. It was shown that the test study and related results here have important theoretical and practical significance for understanding and studying the deformation of soil body caused by dislocation of hidden reverse fault and determining the avoidance distance of surface rupture of seismogenic fault.更多还原