摘要
采用自行设计的监测系统对镇江地区典型滑坡进行监测。根据监测结果详细分析了滑坡累积位移、变形速率以及加速度变化过程,并划分出滑坡变形演化的初始变形、匀速变形及加速变形阶段。结合数值模拟结果判定跑马山滑坡为蠕滑—拉裂型,特殊的地形地貌条件为滑坡提供了良好的临空面,具有弱膨胀性的粉质粘土在水循环作用下,物理力学性质降低,进而影响边坡稳定性。降雨入渗后,形成暂态饱和区,造成土体有效应力降低,并产生指向临空面的静水压力与动水压力,坡体下滑力增加,抗滑力降低。
An independently designed monitoring system to monitor a typical landslide in Zhenjiang, Jiangsu Province is introduced in this paper. The process of landslide about accumulative displacement, deformation rate and acceleration has been analyzed according to the monitoring results. The process of landslide is divided into three phases including initial deformation phase, uniform deformation phase and accelerated deformation phase. The numerical simulation results show that the destructive model of landslide is a creeping-tension cracking type. There is a free face prone to landslide of the special topography. The strength of the silty clay decreases under the influence of water cycles which also affects the slope stability. After rainfall infiltration, the transient saturation region is formed, resulting in the decreasing of effective stress, and producing the hydrostatic pressure and dynamic pressure which point to the free face. Therefore the sliding force increases and the resistance force decreases.
出处
《工程勘察》
2018年第2期17-22,35,共7页
Geotechnical Investigation & Surveying
基金
江苏省国土厅
江苏省地质矿产局科技项目(2015-KY-4)
江苏省社会发展面上项目(BE2015675)
关键词
镇江地区
监测系统
滑坡机制
降雨
Zhenjiang area
monitoring system
failure mechanism
rainfall
