【作者】 常中华； 伍法权； 刘海燕； 梁宁；

【Author】 CHANG Zhonghua~①WU Faquan~①LIU Haiyan~②LIANG Ning~③(①Institute of Geology and Geophysics,CAS,Key Laboratory of Engineering Geomechanics of CAS,Beijing 100029) (②College of Geological Science and Engineering,SDUST,Qingdao 266510) (③Beijing Institute of Geology,Beijing 100120)

【机构】 中国科学院地质与地球物理研究所工程地质力学重点实验室； 山东科技大学地质科学与工程学院； 北京市地质研究所；

【摘要】 针对三峡库区泥灰岩边坡岩体强烈松动、一经扰动即容易出现整体崩溃失稳这一现象,以长江河谷下切引起岸坡应力场变化为背景,从泥灰岩边坡岩石矿物组成成分及岩体结构特征入手,通过扫描电镜、溶蚀试验等方法,证实了泥灰岩岩石矿物化学成分中钙质含量较高,且当地地表水具有溶蚀性。分析认为,雨水(地下水)沿泥灰岩边坡岩层裂隙入渗到岩体深部,岩体在相当深度范围内遭受同步溶蚀,可溶成分受溶蚀作用随地下水带走,使得岩体进一步架空,岩层在重力作用下出现逐级下坐,最终由于丧失结构强度出现崩溃性解体。用数值模拟的方法再现了溶蚀泥灰岩边坡的变形破坏过程,验证了对其变形破坏机理的分析。更多还原

【Abstract】 In the background of a inconsistent slope bank stress field induced by incised valley of Yangtze River, this paper gives its own opinions on the phenomenon that strongly loosen argillaceous limestone slope is easy to become unstable and collapse overall once disturbed in the Three Gorges Reservoir area,by analyzing rock mineral composition and rock structure character of argillaceous limestone slope and with methods of SEM,dissolution test and so on.It points out that relatively high Calcium content is found in rock mineral chemical composition of argillaceous limestone and local surface water is with dissolution.In addition,rain water and ground water are seeping into deep rock mass along fissures developed in stratum of argillaceous limestone slope.Further more,rock mass is suffered synchronous dissolution in a certain content of depth and dissoluble composition of rock is gone with ground water in dissolution effect.As a result,rock mass is more impracticable,terrain collapses step by step in gravity,and finally occurs disaggregation in failure of structural strength.This paper adopts numerical simulation to represent deformation and failure process of dissolution argillaceous limestone slope and validates its analysis on deformation and failure mechanism of dissolution argillaceous limestone slope.更多还原