某大型堆积体地震动力响应及稳定性研究  

Study on seismic force response and sliding stability of large accumulation body

作　　者：张宝成[1,2] 王晓平[3] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031 [2]吉林交通职业技术学院,长春130012 [3]重庆大学土木工程学院,重庆400045

出　　处：《工程勘察》2013年第7期12-17,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(40772175)

摘　　要：汶川地震后,紫坪铺水电站坝前堆积体出现了局部塌陷、地裂缝和基覆界面错动等变形现象。其稳定性对紫坪铺水电站的正常运营意义重大,因此,本文结合地表变形特征和监测结果,对该堆积体地震变形破坏机制进行分析,认为:堆积体的破坏主要表现在灯盏坪前缘的局部区域,而其它部位无明显异常现象,堆积体总体处于稳定状态;该堆积体可能的破坏模式为前缘局部失稳破坏。同时,通过对堆积体稳定性分析认为,该堆积体整体稳定性较好,只是靠近临空面陡缓边坡交接部位稳定性较差。受地震的影响,堆积体仍保持整体稳定,对下游紫坪铺大坝无不利影响。After Wenchuan earthquake in 2008, Hydropower Station dam partially collapsed, cracked the accumulation body in front of the Zipingpu and base shifted along the interface. The stability is significant to the normal operation of the power station. Therefore, the analysis of seismic failure mechanisms is carried out based on the surface deformation characteristics and monitoring results. The analysis shows that the accumulation body is mainly damaged in the front edge and no obvious anomalies are found in the other part of the body. The body is safe on the whole, the possible failure mode of the body is locally failure in the front edge. Analysis on the accumulation body stability shows that the body is overall stabile despite the lower stability is found in the intersection area between steep and gentle slopes, the body remains stable and no adverse impact to the downstream dam after the earthquake.

关 键 词：地震 堆积体 变形破坏 稳定性 

分 类 号：TU457[建筑科学—岩土工程]