滑坡变形空间评价的位移速率比方法研究  

Research on method of displacement speed ratio for spatial evaluation of landslide deformation

作　　者：王立伟[1] 谢谟文[1] 柴小庆[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]长安大学地质工程与测绘学院,西安710054

出　　处：《岩土力学》2014年第2期519-528,共10页Rock and Soil Mechanics

摘　　要：实测数据表明，松散土质斜坡和具有时效变形特征的岩质斜坡的滑坡变形往往具有蠕变特点，即从开始出现变形到最终失稳破坏一般需经历初始变形、等速变形和加速变形3个阶段。基于典型的滑坡累积位移-时间曲线特征，提出了采用位移速率比作为通用指标来判定滑坡上各点变形阶段的方法：多个连续时段均为等速变形即相邻位移速率比位于0～2之间时，认为进入等速变形阶段；当位移速率比大于2时，初步认为，其进入加速变形阶段。结合典型实例建立了位移速率比判定滑坡上各点变形阶段的判定标准：在滑坡位移速率比大于2之后，滑坡体进入加速变形阶段，对加速变形阶段可再作进一步细分：位移速率比为2～6时，为滑坡体的初加速阶段，为6～8时，滑坡体进入中加速阶段，大于8则为临滑阶段。基于地理信息系统（Geographic information system，简称GIS）平台，建立了滑坡变形空间评价的位移速率比方法，并对金坪子滑坡的空间变形状态进行了评价，验证了该方法的可行性和合理性。Monitoring data show that the soil landslide or the rock landslide with the aging deformation characteristics, often have creep characteristics;namely it generally undergoes three stages from the beginning to the failure：the initial deformation, the constant speed deformation and the accelerated deformation. Based on the characteristics of typical accumulation displacement-time curve of the landslide, a method has been proposed to determine the different deformation stages of each point of the landslide mass. Taking the displacement speed ratio （DSR） as a general indicator, when DSR 0-2 means the constant speed deformation, and greater than 2 means the accelerated deformation. Based on some typical landslide cases, a displacement over-acceleration criterion has been established to determine the different deformation stages of each point of the sliding mass：DSR=2-6 means the initial acceleration stage; DSR=6-8 means the intermediate acceleration stage; DSR greater than 8 means the pre-slippery stage. A geographic information system （GIS） based method of DSR has been proposed for the spatial stability evaluation of landslides. As an example, the method has been used to determine the spatial deformation state of Jinpingzi landslide; the result verifies its feasibility and reasonability.

关 键 词：空间评价 位移速率比 滑坡 地理信息系统 

分 类 号：O319.56[理学—一般力学与力学基础]