【摘要】 四川省宝珠寺水库自蓄水以来,由于库水反复升降与暴雨的联合作用,库区沿岸发生了较大面积的滑坡地质灾害,库区许多交通等基础设施、迁建集镇和移民房屋遭到破坏。作者根据库区环境地质条件和滑坡特征调查资料,以金洞和左坝两个典型滑坡为例,对库区沿岸滑坡分布特征、滑坡类型及其形成条件及形成机制、滑坡的活动特征作了详细分析,同时对库岸的地质环境及稳定程度进行了分区和评价。研究结果表明,宝珠寺水库沿岸古堆积体在天然条件下的极限稳定状态过渡到库水作用下新的稳定状态过程中库岸变形滑动明显;堆积体坡度陡结构松、库水反复涨落作用及修路等开挖是重要原因;按照稳定、较稳定、较不稳定及不稳定划分,目前该水库岸坡多数为较稳定和较不稳定状态。更多还原

【Abstract】 Since the Baozhusi reservoir in Sichuan of China stores water,because of the combined action of the rainstorm and the repeated raising and falling of the water in the reservoir,the wholescale geological disasters,such as landslips and mudflows,have occurred along the bank of Baozhusi reservoir.The landslides have serious influences on the economic development and social stabilization of the areas around the reservoir,because many communication projects,communication and electric power facilities,newly-built immigration market towns and immigration houses were destroyed.Based on the investigated and tested data from the field,the distribution feature,types,formation condition and mechansim,sliding situation and potential disaster of the landslides around the reservoir are deeply analyzed in this paper.Meantime,the environmental geological conditions and stability of the bank slopes around the reservoir are evaluated so as to provide the foundation for the government to formulate the district economic development plan around reservoir.The analysis indicates that the Quaternary dilapidation and collapse accumulations along the bank of the reservoir show obvious deformation and slip in the process from its stable limit status under natural conditions to new stable status under the action of the reservoir’s water,and the deformation and slip phenomena are the results from the loosen structure of the accumulation and its steep dipping surface,the repeated raising and fall action of the reservoir’s water and construction of roads or houses.Many areas of the reservoir bank are less stable or less unstable if the whole bank of the reservoir is divided into stable areas,less stable areas,less unstable areas and unstable areas.更多还原