库区岸坡稳定性分析及整治措施研究

Research on Slope Stability and Corrective Measure in Reservoir Bank

库区地质灾害的形成主要是由于大气降雨、工程建设以及水利工程分级蓄水后可能诱发滑坡、崩塌、泥石流及地面塌陷、沉降等造成的。为了探究库区的地质灾害及其成因、破坏机理,保证库岸地区的安全及经济需要,本文以重庆市区域内某库区为研究背景,(1)按照岸坡岩土类型、破坏模式及塌岸强烈程度等特征,结合现场调查及勘探揭示的情况将该勘察区库分为Ⅰ段～Ⅵ段,并对该库区地质灾害体基本特征及变形机制进行了分析;(2)以库岸区段Ⅱ段为例,通过选取区段具有代表性的3个剖面,按照三种不同的工况对选取的剖面进行稳定安全系数及剩余下滑力进行计算,结合计算结果,评价该库岸边坡稳定性;(3)根据塌岸稳定性的计算结果,结合调查的实际情况等,提出库岸塌岸的整治措施与方案,并对方案进行经济社会效益分析,以期为以后库区的地质灾害体预防与治理工作提供一定的参考和借鉴。

The formation of geological hazards in reservoir area are mainly due to rainfall and landslide,collapse,debris flow and surface subsidence because of engineering construction and hydraulic impoundment.In order to explore geological hazards and their causes and destruction mechanism to ensure the safety and economic needs of the reservoir area,with the background of the research in one reservoir in Chongqing,Firstly,in accordance with the characteristics of the type of rock and soil along the bank slope,the failure mode and the intensity of bank collapse,combined with on-site investigation and exploration revealing conditions,the survey area is divided into I-VI sections,and analyzed the basic characteristics and deformation mechanism of geological disasters in the reservoir area.(2)Take the second section of the reservoir section as an example,by selecting a representative 3 profiles of the section to calculate the stability safety factor and residual sliding force of the selected section in three different working conditions,and with the calculation results to evaluate the bank slope stability.(3)According to the calculation results of the stability of the bank collapse,combined with the actual situation of the investigation,etc.,the remediation measures and plans for reservoir bank bank collapse are put forward,the economic and social benefits of the program are analyzed in addition.It’s hoped that these researches can provide some references for preventive and governance work on geological hazards in reservoir area.