心墙构造特性对土石坝稳定性的影响分析

基于Geo-studio研究了粘土心墙防渗体渗透系数、心墙高度和心墙上游坡度变化等构造特性对土石坝渗流和坝坡稳定的影响,采用影响因素正交组合试验设置不同的心墙构造特性参数及其因素水平组合,以坝壳下游渗流流速、心墙浸润线逸出比降和上下游坝坡稳定最小安全系数作为评价指标筛选出心墙最优的特性组合。结果表明,对坝体渗流稳定影响的显著水平依次为心墙渗透系数心墙高度心墙上游坡度;对坝坡稳定影响的显著水平依次为心墙高度心墙渗透系数心墙上游坡度。根据心墙构造因素的显著性分析结果,方案4(A2B1C2)为最优心墙构造特性组合。

Influence of Core Wall Structural Characteristics on Stability of Earth-rock Dam

Geo-studio software was used to study the influence of core wall structural characteristics on the stability of earth-rock dam. The influencing factors include clay permeability coefficient, core wall height and core wall upstream slope. The paper used orthogonal combination scheme to set different structural characteristics and factor level combination of the core wall. The evaluation indicators of core wall to select the optimal combination of characteristics include downstream seepage flow velocity of the dam shell, core wall immersion line hydraulic gradient and the minimum safety factor of the upstream and downstream dam slope .The results show that the significant level of influence on the seepage stability is ranked as: permeability coefficient > core wall height> heart slope gradient; The significant level of influence on the dam slope stability is ranked as: core wall height> permeability coefficient >heart slope gradient. According to the results of the analysis of the significance of the structural factors, scheme 4 (A2B1C2) is the optimal core wall structural characteristics.