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渗流场与应力场的耦合分析是库区水位变动下变形体稳定性研究的热点和难点问题。基于岩体不连续性的离散元方法可以模拟流体在不透水岩体之间的裂隙中的流动,是一种完全的流固耦合分析方法。以金沙江溪洛渡水电站右岸白沙碉变形体为研究对象,通过岸坡岩体力学特性试验给出参数建议值;在充分考虑岸坡区域地质条件特征的基础上,采用离散元方法的应力–渗流耦合分析理论,结合溪洛渡水电站水库调度曲线,研究库水位变动下变形体的稳定性变化过程,并开展基于渗流场计算的极限平衡对比分析。分析结果表明,随库水位增加,变形体的孔隙水压力不断增大,稳定性则逐渐减低;当水位为600 m时,变形体发生失稳;离散元与极限平衡分析结果基本一致,但离散元动态地反映水在裂隙中的流动过程,相对极限平衡分析更能反映实际情况。
Coupling analysis of seepage field and stress field is a hot and difficult issue in the study of stability of deformation body under the fluctuating water level in the reservoir area. Discrete element method based on the discontinuity of rock mass can simulate the flow of fluid in the cracks between impervious rock mass and is a complete method of fluid-structure interaction analysis. Taking the Baishazha deformation on the right bank of the Xiluodu hydropower station of the Jinsha River as the research object, the recommended values of the parameters are given through the mechanical properties of the rock slope. Based on the geological characteristics of the bank slope, the stress-seepage coupling Based on the analysis theory and the curve of reservoir operation of Xiluodu Hydropower Station, the stability of the deformed body under fluctuating water level is studied, and the comparison of limit equilibrium based on seepage field calculation is carried out. The results show that with the increase of reservoir water level, the pore water pressure of the deformed body increases and the stability decreases gradually. When the water level is 600 m, the deformed body experiences instability. The discrete element and the limit equilibrium analysis result are basically the same, but discrete Meta-dynamic reflection of water flow in the fracture process, the relative limit equilibrium analysis can better reflect the actual situation.