强震条件下双面坡变形破坏机理的振动台物理模拟试验研究  

SHAKING TABLE SIMULATION EXPERIMENT ON DEFORMATION-FAILURE MECHANISM OF DOUBLE-SIDES SLOPE IN CONDITION OF INTENSE EARTHQUAKE

作　　者：肖锐铧[1] 许强[1] 冯文凯[1] 陈建君[1] 左雅娅[1] 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室,成都理工大学,成都610059

出　　处：《工程地质学报》2010年第6期837-843,共7页Journal of Engineering Geology

基　　金：国家重点基础研究发展计划课题(2008CB425801);地质灾害防治与地质环境保护国家重点实验室“科技减灾、重建家园”专项基金(DZJK-0811)联合资助

摘　　要：5.12汶川地震引发了数以万计的崩塌、滑坡、泥石流等地质灾害。为了研究双面坡在强震条件下的动力响应规律,本文在大量野外调查的基础上,采用振动台物理模拟试验手段,设计完成了四类11个模型试验,从改变模型的坡度和坡顶宽度、软岩硬岩结合、阶梯状坡形等角度,较系统地研究了双面坡在强震作用下的响应规律。试验结果显示:强震条件下地震水平惯性力是导致边坡破坏的主要原因;在地震情况下边坡变形破坏表现出明显的初动破坏效应;振动过程中双坡具有明显的共剪效应,坡面为阶梯状时其共剪效应更明显;坡体结构为上软下硬时下部硬岩对振动具有一定的放大效应,上硬下软时坡体易整体偏移产生变形破坏。试验结论与实际情况基本符合。5·12 Wenchuan earthquake triggered thousands of rock-collapses,landslides,debris flows and other geological disasters.In order to study the response of the double-sides slope to the earthquake,we designed a total of 11 models according to the field investigation.We took four factors into consideration to study the seismic response of the slope.The four factors are the slope-degree,the top width of slope,structure combination and the shape of the double-sides slope.The tests manifested that（a）seismic inertia force is the main factor that results in slope failure;（b）the deformation and failure of the slope has a relation to the initial seismic direction;（c）the double-sides slope shows an conjugated-shear phenomenon;（d）different structure combinations of slopes result in different failure modes;e）the conjugated-shear phenomenon is more obvious on the ladder-shaped double-sides slope.The test findings are well in line with the results of field investigation.

关 键 词：强震区 双面坡 振动台 物理模拟 

分 类 号：P642[天文地球—工程地质学]