小湾水电站库区新民坝子滑坡稳定性研究-《山地学报》

文章信息/Info

Title:: Stability of Xinminbazi Landslide Located in Xiaowan Hydropower Station Reservoir Region

Author(s):: LIU Yunpeng; HUANG Runqiu; DENG Hui; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu 610059，Sichuan，China

Keywords:: reservoir slope stability; progressively backward failure model; fluidstructure interaction

摘要:: 水库库区形成以后,由于水位的上升变动往往触发相当数量的坍塌和滑坡,对库岸稳定性造成严重影响。以小湾水电站库区新民坝子滑坡为例,在岸坡地质条件及变形破坏特征调查的基础上,对其变形破坏机制和稳定性进行分析和评价,得出其变形破坏方式为前缘-后缘逐级后退式失稳模式,且现状处于欠稳定状态;通过概化其地质模型,采用FLAC3D数值模拟手段进行流固耦合分析,得出水位上升至调查水位1 160 m高程和正常蓄水位1 240 m高程时的岸坡稳定性状况,计算结果表明蓄水至1 240 m高程后岸坡存在产生较大规模失稳的可能。这对类似库岸滑坡的调查分析具有一定参考意义。

Abstract:: A significant number of collapses and landslides are often triggered by the rising water level changes after reservoir formation, forming a serious impact on the stability of reservoir bank. In this paper, taking Xinminbazi landslide in Xiaowan Hydropower Station Reservoir for an example, its mechanism of deformation and failure is analysed and the stability is evaluated on the basis of the investigation of geological conditions and deformationfailure features in the slope. It is the conclusion that the unstable type is progressively backward failure model from front edge to back edge and stability is less stable in the status quo;Using the numerical simulation means of FLAC3D for fluidstructure interaction analysis through generally simplifying feological model,the slope stability conditions are got when water level reached up to the investigate water level elevation 1 160 m and normal water level elevation 1 240 m, results show that there exists the possibility of largescale instability after storage to water level elevation 1 240 m.The article has some reference significance for investigation and analysis of similar bank landslide.