高速公路大坪滑坡深部监测动态特征分析

Analysis of Dynamic Features in Daping Landslide Deep Monitoring in Expressway

重庆市奉节大坪滑坡是由前级浅层的堆积层滑坡和破碎岩石滑坡组合而成的复合型大型老滑坡。根据勘测结果分析,岩层顺倾地区是滑坡易发地区,由于隧道开挖,引起了大坪老滑坡的整体复活。布置测斜孔对滑坡进行深部位移监测,监测结果分析表明:大坪滑坡存在典型滑动带,降雨对滑坡影响较大,滑动面较深,且滑动面以上滑坡体不同部位变形速率不一致,通过明确滑动带的位置、厚度、滑动方向及变形范围,为工程治理设计提供了依据。

Daping landslide in Chongqing Fengxi highway is a complex large old landslide which is made up of anterior shallow accumulation landslides and broken rock landslides. The survey result analysis indicated that the rock formations along the dumping angle are landslide-prone areas and tunnel excavation caused the overall revival of Daping old landslide. This paper disposed the inclinometer hole for the landslide deep displacement monitoring and the test results showed that there are typical sliding areas in Daping landslide, rainfall have a greater impact on landslides, the sliding surface is deep and deformation speed of landslide different parts above the sliding surface is inconsistent, which provides a reference for engineering treatment design by determining the position, thickness, direction and deformation scope of the sliding zone.