构造动力对滑坡灾害发育的影响———以喜马拉雅东构造结地区为例

The Influence of Tectonic Dynamic on Landslide:Example of Eastern Himalayan Syntaxis Region

基于有限元数值模拟技术,利用GPS数据获取喜马拉雅东构造结区域的断裂运动状态和构造应力场,并结合区域滑坡隐患探讨构造活动对滑坡灾害发育的影响。结果显示,差异化的断裂运动会造成显著相异的构造应力分布,而区域滑坡灾害更集中分布在断层锁固引起的构造应力异常区域;对应力异常区的斜坡进行稳定性研究发现,受应力长期累积影响,斜坡表层应力场持续扰动,造成潜在危险滑移面安全系数降低,促进滑坡失稳。研究表明,断裂构造运动模式可对区域滑坡灾害的发育和分布造成不可忽视的影响,且长期持续的构造应力荷载将促进滑坡灾害的发育。

Using finite element numerical simulation technology,according to the GPS data,we simulate the state of regional fault movement and obtain the regional tectonic stress field in Eastern Himalayan Syntaxis.Further combining these results with the regional potential landslides,we analyze the influence of tectonic dynamics on landslides.The results show that different fault tectonic movements led to significantly different tectonic stress distributions,and landslides are more concentrated in locked patches that cause abnormal tectonic stress.According to the stability study of the slope in the stress anomaly area,affected by the long-term accumulation of stress,the surface stress field of the slope is continuously perturbed,resulting in the reduction of the safety factor of the potential failure zone and promoting the instability of landslides.The study shows that the movement state of fault has a great influence on the development and distribution of regional landslide,and the long-term continuous tectonic stress load will promote the development of landslide disasters.