摘要
“8.8”九寨沟地震诱发大量崩塌、滑坡地质灾害。熊猫海上游右岸边坡产生大规模崩塌落石,堵塞景区道路,部分掉落熊猫海。震后斜坡仍存在部分危岩,稳定性较差,严重制约了景区恢复运行。本文通过野外调查、数值模拟等手段,分析该危岩的影响因素及失稳模式,失稳模式为滑移式。基于极限平衡法和二维离散元UDEC 6.0模拟对典型工况下危岩的稳定性计算,表明天然工况下危岩稳定;暴雨工况上部临空面附近及中部凹腔部位会发生少量落石掉块,整体仍处于稳定状态;地震作用下,潜在破裂区上部拉裂及下部剪切裂隙构成贯通破裂面而整体失稳。
The Jiuzhaigou Earthquake on Aug. 8, 2017 brought out a great amount of landslides and debris flows. The right bank slope of the upper reaches of the Panda Lake produces large-scale rockfall, blocking the scenic roads. Geological survey and numerical simulation indicate that the instability mode of the dangerous rock masses in the study area is sliding mode. The simulation experiment of the stability of dangerous rock masses under different working conditions based on the limit equilibrium method and the two-dimensional discrete element UDEC 6.0 shows that the dangerous rock masses are stable under natural conditions, and a small amount of falling rocks and blocks will occur near the upper free surface and the central concave rock cavity, but the whole will be still in a stable state under heavy rain conditions, however, the whole will be unstable under the action of an earthquake.
作者
黄健
胡卸文
贺书恒
HUANG Jian;HU Xie-wen;HE Shu-heng(Southwest Jiaotong University,Chengdu 610031)
出处
《四川地质学报》
2020年第2期284-289,308,共7页
Acta Geologica Sichuan
基金
国家重点研发计划(2018YFC1505401)。
关键词
九寨沟
熊猫海
危岩
稳定性分析
数值模拟
Jiuzhai Valley
Panda Lake
dangerous rock
stability analysis
numerical simulation
