北京市戒台寺滑坡发生发展机理研究  

MECHANISM FOR INITIATION AND DEVELOPMENT OF JIETAI TEMPLE LANDSLIDE IN BEIJING

作　　者：廖海军[1] 祁生文[2] 杨存进 王桢 

机构地区：[1]中国地质大学(北京) [2]中国科学院地质与地球物理研究所,北京100029 [3]中铁西北科学研究院,兰州730000

出　　处：《工程地质学报》2007年第5期585-592,共8页Journal of Engineering Geology

基　　金：中国青年科学基金(No.40302032)资助.

摘　　要：戒台寺滑坡位于北京市门头沟区马鞍山的北麓,马鞍山背斜的北翼,组成边坡的岩性较为软弱。由于多期构造运动的影响,岩体中裂隙发育,岩体结构破碎,风化卸荷严重。边坡为顺倾结构,边坡中顺倾坡外的软弱夹层、软弱结构面及断层发育,它们分别为边坡的滑动提供了滑动面和切割面的作用。由于边坡中岩层倾角大于边坡的坡度,因此并没有剪出的临空面,只是一个受特定边坡结构控制的蠕变体。但是近年来在胜利煤矿和石厂煤矿的大规模采掘Ⅳ级平台山梁下煤层影响下,形成采空移动盆地,造成Ⅳ级平台山梁整体塌陷,客观上为蠕变体提供了变形空间,引起戒台寺SN向山梁Ⅰ～Ⅲ级平台坡体依附于断层破碎带或软弱夹层的松弛,导致各块坡体沿软弱结构面向临空产生蠕动和滑动。采石场大药量爆破的地震波的频繁作用影响,使坡体内的构造结构面扩展松弛张开,表水易于下渗,岩体强度及变形特性显著降低,斜坡稳定性对降雨入渗的敏感性显著提高,最终导致了蠕变体变形的加速。Jietai temple landslide is located in the north wing slope of Ma＇nshan mountain, Mentougou district of Beijing. The rock mass of the slope is weaker. Cracks is well developed. Rock mass of the slope is strongly unloaded and weathered severely after it had experienced several tectonic movements. The slope has daylighting bedding planes. Weak interlayers, weak structural surfaces and faults are well developed. All these discontinuities provided cutting and slipping surfaces for the landslide. Because the dip angle of the beddings is greater than that of the slope, the slope cant slide down along the bedding surface. Thus, the slope is a creep deformable body and controlled by specific discontinunity structures. Two coal mines locate in the middle of the mountain slopes. The mining activities such as excavation and blasting caused the slope rock mass to form and creep gradually and eventually to collapse locally.. Consequently, the slope creeped, relaxed and slipped along the weak planes. Rainfall water could infiltrate into the slope easily. Slope deformed and slipped more and more until its failure.

关 键 词：戒台寺 滑坡 顺倾的边坡结构 采空塌陷 

分 类 号：P642.22[天文地球—工程地质学]