岩块受震滑动之临界加速度研究  

The Study on the Critical Acceleration of Block Sliding Induced by Seismic Excitation

作　　者：郑富书[1] 李国诚[1] 黄灿辉[1] 林铭郎[1] 李宏辉[1] 罗佳明[1] 

机构地区：[1]台湾大学土木工程学系

出　　处：《隧道建设》2007年第S2期140-143,共4页Tunnel Construction

摘　　要：受地形影响及隧道进洞位置限制,隧道洞口常有边坡稳定的问题存在。尤其在地震力之作用下,可能因岩石边坡表面之关键岩块滑移,进而导致坡面后方大规模坡体崩坏而肇灾。如能分析该类岩块受地震作用之运动行为,将可作为判断边坡受地震作用下之稳定性分析之参考依据。根据Newmark(1965)提出的滑动块体法,其说明了影响块体滑动之重要因子为"临界加速度"。因此,在利用此法进行岩石边坡块体受到地震力影响的滑动分析时,需先针对临界加速度进行研究。然而,滑动块体法定义的临界加速度为最大静摩擦角之函数,直接应用于工程上恐有过于保守之虞。本研究旨在利用小型振动台物理模型试验进行临界加速度之量测,进而了解实际滑动面之临界加速度与理论值之差异,并提供后续研究之参考。There are joints and cracks within rock mass on rock slopes, in contrast to soil slope which are successive failure. In comparison with the conventional pseudo-static method, the cumulative displacement (Newmark, 1965) one is a more effective approach to measure the stability of the rock slope under the influence of an earthquake.In this research, the critical acceleration ( Ac) was measured by means of shaking table test. However, the results show significant difference between experimental and theoretical Ac. Further research on this topic would provide the reference about rock slope earthquake engineering.

关 键 词：关键岩块 振动台 Newmark位移法 加速度 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]