工程地质学报2011，Vol.19Issue(6)：823-830,8.
巫山县望霞危岩体变形监测及破坏机制分析
DEFORMATION MONITORING AND FAILURE MECHANISM OF WANGXIA DANGEROUS ROCK MASS IN WUSHAN COUNTY
摘要
Abstract
In August 2010,serious deformation occurred in the Wangxia dangerous rock mass. The local residents and river channel safety are in high risk. This paper is based on detailed investigation of the new cracks, deformation history, GPS observations, total station monitoring and crack displacement monitoring data analysis. It analyses comprehensively the deformation and reasons of the unstable rock mass. The results show that the overall displacement direction of the rock mass was towards to SW with obvious subsidence deformation. The T10 crack controlled cracking and the back edge of the deformation zone that mainly manifested as crack opening and settlement deformation. The overall displacement direction of the block between the T11 and T12 cracks was towards to SW and accompanied with settlement deformation more than horizontal displacement. Serious deformation occurred in the block near the T13 crack, caused by the block squeezing action between the T11 and T12 cracks. A group of structural planes with large and straight persistence and good apertures were developed due to connected joint surfaces in the formations of the dangerous rock mass. The planes controlled the destruction of the rock that were parallel to the failure surface.The dangerous rock mass and its weak base rock formed a typical hard to soft to hard lithologic layers,which provided a combined condition of the geological structure for the interlayer-gliding of the rock mass. The expansion of the cracks and collapse pits were formed on the basis of previous deformation. They had very close relationship with the mining activities at the bottom of the rock mass. Subsided extrusion type collapse had formed so that the dangerous rock mass undertook rotational sliding to the free face after rainfall.关键词
望霞危岩/变形监测/关键裂缝/软岩基座/综合分析/坐落挤出式崩塌Key words
Wangxia.Rock mass failure, Deformation monitoring,Rock cracks,Weak base,River,Rainfall分类
天文与地球科学引用本文复制引用
乐琪浪,王洪德,薛星桥,高幼龙,金枭豪,张俊义,潘尚涛..巫山县望霞危岩体变形监测及破坏机制分析[J].工程地质学报,2011,19(6):823-830,8.基金项目
国家重大工程地质灾害预警专项-三峡库区地质灾害专业监测. （）
