东南亚某水电站厂房边坡开挖变形特征及成因机制分析  

Deformation Characteristics and Mechanism of Slope Excavation in a Hydropower Station in Southeast Asia

作　　者：柳旻 姚晨辉 张超 黄磊 LIU Min;YAO Chenhui;ZHANG Chao;HUANG Lei(China Jikan Research Institute of Engineering Investigations and Design,Co.,Ltd.,Xi' an,Shaanxi 710043,China)

机构地区：[1]机械工业勘察设计研究院有限公司

出　　处：《水利与建筑工程学报》2019年第5期133-137,共5页Journal of Water Resources and Architectural Engineering

摘　　要：为研究开挖导致边坡裂缝分布几何变异及断层破碎带局部滑塌机制,以东南亚某在建水电站厂房开挖过程出现的系列变形破坏为对象,采用现场地质调查、变形监测数据对边坡变形破坏现象的成因进行了系统的分析。分析结果表明:结果表明,大规模开挖引起边坡岩体应力场的改变,应力重分布调整,岩体向临空面回弹变形,加剧了岩体裂隙发育、张开及贯通,加之受断层及地下水影响,导致在混凝土喷面出现裂缝和局部滑塌。在EL.734 m高程滑塌体后缘产生4条横向裂缝,监测数据表明裂缝宽度有扩大趋势,需要及时进行支护,以防滑塌体再次发生变形破坏。In order to analyze the geometric variation of slope crack distribution caused by excavation and the local collapse mechanism of fault fracture zone, a series of deformation and failure occurred during the excavation of a hydropower station under construction in southeast Asia were analyzed. The results show that that the large-scale excavation causes the change of stress field, the adjustment of stress redistribution and the rebound deformation of rock mass towards the free surface, which aggravates the development, opening and penetration of rock mass fissures, together with the influence of faults and groundwater, resulting in concrete spray surface cracks and local sliding. There are four transverse cracks on the rear edge of the EL. 734 m landslide. The monitoring data show that the width of the cracks tends to expand, therefore it is necessary to support them in time to prevent the landslide from deforming and destroying again.

关 键 词：厂房边坡 开挖变形 成因机制 

分 类 号：TU457[建筑科学—岩土工程]