心墙水力劈裂与孔压关系的探讨

基于Biot固结理论的有效应力二维数值模拟方法，研究了堆石坝的粘土心墙水力劈裂过程中孔隙水压力的变化．分析了坝体竣工期粘土心墙中的拱效应，探讨了从竣工固结到蓄水过程和稳定渗流期粘土心墙中孔隙水压力的变化分布特点，并对心墙发生水力劈裂的可能性进行判断．研究结果表明：堆石坝粘土心墙内部孔隙水压力梯度的模拟分析能更加合理地解释水力劈裂发生与蓄水速度和心墙低渗透性的关系，因此，分析考虑水位上升过程中粘土心墙内孔隙水压力分布情况是研究心墙水力劈裂发生机理的重点．

The analysis of the relationship between hydraulic fracture and the pore pressure

Based on the consolidation theory of Blot effective stress analysis method, two-dimensional numerical simulation is adopted to study the dam from the completion of the dam to the clay core run-time pore pressure changes in the process. Arching effect of the completion period and the changes with the completion of the process of consoli- dation on the stability of the water flow in the pore water pressure distribution are ana- lyzed based on the analysis of clay core dams, the mechanism of hydraulic fracture on the basis of the core wall of the dam occurred in the hydraulic is determined with the possibility of splitting. The results show that the simulation of gradient internal pore water pressure for the clay core of rockfiUed dam core can reasonably explain the occur- rence of hydraulic fracturing with water speed, and the low permeability of the core wall has great effects. When hydraulic fracture occurred with the core wall mechanism of the core wall, the distribution of clay pore water pressure must be taken into account.