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在对基岩顺向滑坡进行详细工程勘查的基础上,利用地表GPS位移监测技术,分析监测数据蕴含的坡体稳定性信息,研究坡体的变形趋势,监测数据显示:强变形区Ⅰ内,滑坡处于持续变形状态,不同部位变形速率存在差异,局部区域位移速率呈上升趋势;暴雨和极端降雨等不利工况下,滑坡变形加剧,位移普遍呈现指数型增长。对处于持续变形的坡体,运用Geo-studio软件进行稳定性校核,计算结果表明:实测水位下,三个计算剖面坡体安全系数满足要求,坡体处于较稳定状态;降雨条件下,存在不稳定滑动面,部分坡体处于欠稳定状态。通过变形监测和稳定性分析,为坡体的稳定性评价以及采取相应的坡体防护措施提供了依据。
On the basis of a detailed engineering survey of the forward slope of the bedrock, the ground surface GPS displacement monitoring technique is used to analyze the slope stability information contained in the monitoring data to study the deformation trend of the slope body. The monitoring data show that in the strong deformation zone Ⅰ, Landslide is in a state of continuous deformation, with different deformation rates at different sites, and displacement rates in some areas show an upward trend. Under adverse conditions such as heavy rain and extreme rainfall, landslide deformation aggravates and displacement generally shows exponential growth. The stability of the slope in the continuous deformation was checked by Geo-studio software. The results show that under the measured water level, the slope safety factor of the three calculated sections meets the requirements and the slope body is in a relatively stable condition. Under the condition of rainfall, Unstable sliding surface, part of the slope is not stable. Through the deformation monitoring and stability analysis, it provides the basis for the stability evaluation of the slope and the corresponding measures of slope protection.