樟木堆积体斜坡动力稳定性与极限承载力评价  

Dynamic Stability Analysis and Ultimate Bearing Capacity Evaluation of Zhangmu Landslide Deposit

作　　者：王海芝[1] 王颂 周剑 张路青[2,3,4] 黄福有 WANG Haizhi;WANG Song;ZHOU Jian;ZHANG Luqing;HUANG Fuyou(Beijing Institute of Geology, Beijing 100120, China;Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京市地质研究所,北京100120 [2]中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室,北京100029 [3]中国科学院大学地球与行星科学学院,北京100049 [4]中国科学院地球科学研究院,北京100029 [5]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《西北地质》2022年第1期262-273,共12页Northwestern Geology

基　　金：第二次青藏高原综合科学考察研究“祁连山阿尔金可可西里区重大工程扰动灾害及风险”(2019QZKK0904);国家自然科学基金面上项目“深埋应力环境下致密储层裂隙渗透率演化与预测方法”(41972287);西藏区域协同创新项目“西藏樟木滑坡勘查评估综合研究”(13143);“罗布泊地区人类活动的时空变化特征与环境变化”(41772182)。

摘　　要：樟木位于喜马拉雅山中段,是中国与尼泊尔的重要通商口岸,也是中尼公路的咽喉。特殊的地质地形条件和丰富的降水为地质灾害的发生提供了充分条件,区域内滑坡地质灾害发育。大量房屋建筑修建于樟木滑坡堆积体之上,滑坡灾害严重威胁到当地人民群众的生命财产安全和口岸经济的发展。目前,大量有关樟木滑坡堆积体稳定性的评价只考虑了暴雨条件和通过强度折减简化的地震作用,而忽略了地震的动态作用过程和人类活动的影响。为了精确论证该堆积体在动力载荷作用下的稳定程度,笔者在野外调查的基础上,计算了地震和车辆震动等极端工况下的动态安全系数,并按照地形条件、地质特征及已有滑坡分布状况,分区块评价其极限承载力。结果表明,堆积体古滑坡基本稳定,但前缘和后缘区块的承载力偏低;现代滑坡稳定性较差,没有进一步的承载空间,应禁止增加表观荷载。结论为系统治理樟木滑坡灾害,优化樟木建设用地布局和确保口岸的可持续发展提供了科学支撑。Zhangmu,located in middle Himalayas,is an important trading port between China and Nepal and serves as the regional economic development center.Special geological and topographical characteristics and abundant precipitation provide sufficient conditions for the frequent occurrence of geological disasters,especially the landslide disasters in the region.As a large number of house buildings were built on the deposit of Zhangmu landslide,the landslide disasters seriously threaten the safety and property of the local people,and restrict the development of port economy.Previous studies on the stability of Zhangmu landslide deposit only focus on the rainstorm condition and the seismic action simplified by strength reduction method while ignoring the dynamic action process of the earthquake and the influence of human activities.In order to accurately demonstrate the stability of the landslide deposit under dynamic load,this paper calculated the dynamic safety coefficients under extreme conditions such as earthquake and vehicle vibration according to field investigations,and evaluated the ultimate bearing capacity by block based on the characteristics of geology,topography and existing landslides distribution.The results show that the deposit of ancient landslide is generally stable,but the bearing capacity of the front and back edge sections is relatively low.The modern landslide has poor stability and no further load-bearing space.Therefore,it is prohibited for the modern landslide to increase the apparent load.The conclusions of this paper provide scientific support for the systematic control of Zhangmu landslide,the layout of Zhangmu construction land and the sustainable development of the trading port.

关 键 词：地质灾害 樟木滑坡 动力稳定性 地震载荷 车辆载荷 极限承载力 

分 类 号：P642[天文地球—工程地质学]