水库蓄水对317国道某崩塌堆积体稳定性影响
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摘要
某堆积体滑坡位于狮子坪水电站近坝库段右岸,属崩塌堆积体在水库库水作用下沿基覆界面发生的后退式逐步破坏滑坡。2009年9月水库初次蓄水导致了崩塌堆积体强烈变形破坏,对317国道造成极大的危害。研究该崩塌堆积体滑坡成因机制对317国道沿线同类型滑坡治理具有重要意义。从堆积体结构以及赋存的地质环境,结合水库蓄水过程坡体变形破坏迹象,研究了该崩塌堆积在水库蓄水过程中的变形机制,评价预测堆积体的稳定性。分析表明:堆积体在现有2 490 m水位天然条件下处于蠕滑状态,在暴雨及地震或水库蓄水至正常蓄水位2 540 m的条件下,滑坡将发生失稳破坏;堆积体进行了必要的应急治理后,目前处于相对稳定状态。
Located at the right bank of the reservoir near the dam site of Shiziping hydroelectric station,the studied deposit landslide is a gradually destroyed retrograde landslide caused by the collapse deposit under the effect of reservoir water along the interface between deposit and bedrock.The first impoundment of the reservoir in September 2009 leads to intense deformation and failure of the collapse deposit,hence causes great harm to the 317 national highway.In this sense,it is of great significance to study the formation mechanism of the collapse deposit so as to prevent similar landslides from happening again.According to the geological condition,the structure of the slidemass,and the deformation evidence of the slope during reservoir impoundment,the deformation mechanism is studied,and the stability of the slidemass is evaluated and predicted.Results show that when the water reaches the natural level of 2 490 m,the slidemass will creep;when there is rainstorm,earthquake,or when the water reaches the normal impoundment level of 2 540m,failure of the slidemass will occur.Currently the deposit landslide is relatively stable after proper emergency measures were taken.
Located at the right bank of the reservoir near the dam site of Shiziping hydroelectric station,the studied deposit landslide is a gradually destroyed retrograde landslide caused by the collapse deposit under the effect of reservoir water along the interface between deposit and bedrock.The first impoundment of the reservoir in September 2009 leads to intense deformation and failure of the collapse deposit,hence causes great harm to the 317 national highway.In this sense,it is of great significance to study the formation mechanism of the collapse deposit so as to prevent similar landslides from happening again.According to the geological condition,the structure of the slidemass,and the deformation evidence of the slope during reservoir impoundment,the deformation mechanism is studied,and the stability of the slidemass is evaluated and predicted.Results show that when the water reaches the natural level of 2 490 m,the slidemass will creep;when there is rainstorm,earthquake,or when the water reaches the normal impoundment level of 2 540m,failure of the slidemass will occur.Currently the deposit landslide is relatively stable after proper emergency measures were taken.
引文
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