沙湾水电站厂房后坡变形体地表三维监测分析

3D Monitoring Analysis of Slope Deformation Body behind Shawan Hydropower House

通过对木里河沙湾水电站厂房后边坡变形体的地表三维监测资料的分析,可以判断其变形是由于阀室交通洞的集中排水造成的,由于厂房边坡开挖、S216省道改线和雨季降水入渗等因素的共同作用,进一步加剧了边坡的变形。从跨年度监测资料分析来看,变形体的变形量虽呈季节周期性变化,但已趋于收敛,在不改变坡体边界条件的工况下,降水对坡体稳定性的敏感度已显著降低。

The deformation reason can be confirmed as the results of concentrated drainage of valve chamber traffic tunnel by analyzing 3D monitoring data of the slope deformation body surface behind Shawan hydropower house in Muli River. Together with the influence of powerhouse slope excavation, changing line of the 60th provincial highway and rainfall seepage, the deformation of slope is aggravated. The deformation quantity of the slope deformation body becomes to con- vergence, in despite of seasonal variety, based on the monitoring data analysis of more than one year. The sense degree of rainfall on slope stability has become down obviously, under the circumstances of keeping boundary condition.