不同蓄水速度条件下库区岸坡变形体渗流特征研究

Seepage Characteristics of Bank Slope Deformable Body in Reservoir Area under Different Water-storage Speed Conditions

介绍了西藏某水库库区岸坡变形体的工程地质条件,建立了变形体渗流场数值模拟模型,确定了数值模拟计算参数;其次,基于非饱和渗流理论,分析和研究了不同蓄水速度下库区岸坡变形体的渗流场变化特征,得出按4种不同速度蓄水时,水库库区岸坡变形体内部渗流场变化存在明显的时效性和非线性特征,且蓄水速度越大,非线性渗流特征越明显;4种速度蓄水引起的库水位抬升均对靠近库岸浅表层处的局部渗流场影响最大,对岸坡深部基岩处的局部渗流影响基本无影响;4种蓄水速度主要影响库区岸坡变形体内部渗流场的变化过程,对渗流场的始末状态影响不大.

The engineering geological condition of deformable body on Reservoir Bank of a reservoir of Tibet are introduced by with the numerical simulation model of seepage field of the deformable body established, and the calculation parameters of numerical simulation set;Secondly, based on unsaturated seepage theory, the characteristics of seepage field changes of bank slope deformable body in reservoir is analyzed and researched in conditions of different water-storage. First of all, it is concluded that there are obvious characteristics of timeliness and nonlinearity in seepage field changes inside bank slope deformable body in reservoir according to four types of speeds water storage, and the faster the storage speed is, the more obvious the non-linear seepage characteristics are. What’s more, the local seepage field near the shallow surface of the reservoir bank is most affected by the rise of reservoir water level caused by four kinds of water storage at different speeds, while the local seepage field near the deep bedrock of the bank slope is almost not affected. Last but not least, four kinds of water storage speeds mainly affect the change process of seepage field inside the bank slope deformation body in the reservoir area, but have little effect on the initial and final state of seepage field.