摘要
[目的]借助龙洞水滑坡典型实例,从静水压力和滑带软化角度分析滑坡的成因机制,为该类滑坡的进一步识别及研究提供理论依据。[方法]通过详细的现场地质调查、遥感摄影、工程地质测绘及离散元数值模拟分析,对滑坡的变形破坏特征进行分区评价,并对其成灾机制进行探究。[结果]地质构造形成的宽缓向斜形成了滑坡的雏形,软硬相间的互层结构提供了滑坡的物质基础,三面临空的地形地貌条件为其提供运动变形空间,卸荷及构造裂隙为地表水的入渗提供了优势通道,地下水对潜在滑面的软化作用和静水压力是滑坡启动发生的诱发因素。[结论]滑体的运动不仅仅是后缘裂隙静水压力的作用或者地下水的物理软化作用,而是后缘裂隙静水压力和滑带物理软化的共同作用,并且后缘静水压力在斜坡的变形破坏和滑体的运动中起到加速的作用。
[Objective]Using Longdongshui landslide as a case,this article analyzed the genesis mechanism of this kind of landslide from the aspects of hydrostatic pressure and sliding belt softening,and aimed to provide theoretical basis for further identification and research of this kind of landslide.[Methods]Through detailed field geological survey,remote sensing camera,engineering geological mapping and analysis of discrete element numerical simulation,the characteristics of deformation and failure of the landslide were assessed,and the mechanism of the disaster was explored.[Results]The rolling syncline shape by geological structure formed the rudiment of the landslide;soft and hard interbedding structure provided the material basis for the landslide;three directional emptiness for landform condition provided space for the motion and deformation space;unloading and tectonic fracture provided precedent infiltration channel for surface water;water softening effect of the potential sliding surface by groundwater and static water pressure were the triggering factors of landslide.[Conclusion]The movement of the sliding body is not only the effect of the hydrostatic pressure of the posterior margin,but also is the physical softening of the groundwater.It is the joint effect of the hydrostatic pressure and the physical softening of the trailing edge fracture that will result to,and furthermore,the trailing edge hydrostatic pressure plays an accelerated role in the deformation and sliding of the slope.
出处
《水土保持通报》
CSCD
2017年第6期162-167,共6页
Bulletin of Soil and Water Conservation
关键词
拉陷槽
碎屑流
数值模拟
成灾机制
pull slot
debris flow
numerical simulation
disastrous mechanisms
