摘要
库水位上升对库岸边坡的影响程度与水敏性地层位置、水位、滑面倾角等多个因素有关。为了研究白鹿塬鲸鱼沟水库蓄水过程中库水位升高对边坡稳定性的影响,依据水库区的边坡演化、地层结构、库水位与地层的关系等因素,对库区内的51个边坡剖面进行统计和分类,可将鲸鱼沟内的边坡分为第三系砂泥岩边坡、黄土-砂泥岩陡坡、黄土-砂泥岩陡坡和残坡积土-砂泥岩缓坡等四种类型,并选取4个典型的边坡类型建立起地质模型,采用Morgenstern-Price法计算了库水位升高过程中不同边坡类型的稳定系数。结果表明,任何库水位条件下,鲸鱼沟内的第三系砂泥岩陡坡、黄土-砂泥岩陡坡和残坡积土-砂泥岩缓坡的稳定系数均高于水利水电工程边坡的设计安全系数。黄土-砂泥岩缓坡由于Q_(2-3)黄土披覆于整个坡面,导致其稳定性差,在库水位上升过程中,稳定系数下降率大,易形成滑坡和库区塌方,经计算可知危险水位下黄土-砂泥岩缓坡滑移方量约占库区总滑移方量的13%。
The influence degree of reservoir water level rise on reservoir bank slope is related to many factors,such as water sensitive stratum position,water level,sliding surface angle,etc.In order to study the influence of reservoir water level rising on slope stability during the impoundment process of Jingyugou reservoir in Bailuyuan,51 slope profiles in the reservoir were counted and classified according to the slope evolution,stratum sructure,and the relationship between reservoir water level and stratum.The slope in jingyugou can be divided into tertiary sandstone mudstone slope,loess sandy mudstone gentle slope,loess sandy mudstone steep slope and eluvial soil sandy mudstone gentle slope.Four typical slope types were selected to establish the geological model,and Morgenstern price method was used to calculate the stability coefficients of the slope types in the process of reservoir water level rising.The results show that the stability coefficient of the tertiary mudstone slope,loess sand mudstone steep slope,loess sandy mudstone steep slope and eluvial soil sandy mudstone gentle slope in whale ditch is higher than the design safety factor of water conservancy and Hydropower Engineering Slope under any reservoir water level conditions.Due to Q 2-3 loess covering the whole slope,the stability of loess sandy mudstone gentle slope is poor.In the process of reservoir water level rising,the decline rate of stability coefficient is large,which is easy to form landslide and reservoir collapse.The calculation shows that the sliding volume of loess sand mudstone gentle slope under dangerous water level accounts for about 13%of the total sliding volume in the reservoir area.
作者
曹博
鲁博
于前伟
葛书磊
秦二乐
李同录
李萍
CAO Bo;LU Bo;YU Qianwei;GE Shulei;QIN Erle;LI Tonglu;LI Ping(School of Geological Engineering and Surveying,Chang’an University,Xi’an,Shaanxi 710054;Water Cycle and Geological Environment Observation and Research Station for the Chinese Loess Plateau,Ministry of Education,Zhengning,Gansu 745339;Northwest Survey and Design Institute of China Power Construction Group,Xi'an,Shaanxi 710065)
出处
《河北工程大学学报（自然科学版）》
CAS
2020年第4期71-77,共7页
Journal of Hebei University of Engineering:Natural Science Edition
基金
国家自然科学基金资助项目(41502286)
中央高校基本科研业务费专项资金资助(300102260507)。
关键词
水库蓄水
土质边坡
稳定系数
滑移方量
鲸鱼沟
reservoir impoundment
soil slope
stability coefficient
sliding volume
Jingyugou
