中文摘要：

层间裂缝的水力渗透破坏对拱坝工作性态会有较大影响。本文结合某300m级拱坝的一处层间裂缝，基于非线性迭代法求解缝的开闭、滑移和扩展问题，进行了层间裂缝水力渗透的稳定性分析。研究结果表明：只考虑自重和水压作用，裂缝有可能往上游侧扩展，而往下游侧扩展的动力不足；裂缝是否扩展对于混凝土断裂韧度的敏感性较弱，但对于处理后黏结强度的敏感性较强；温升温降荷载会加大裂缝扩展的风险；正常荷载作用条件下，裂缝对拱坝整体应力和位移的影响不大，只对局部区域有一些影响；岸坡岩基较河床硬时，会略微降低该裂缝扩展的可能性；进一步提出做好上游防渗及钻孔形成排水通道等建议。

英文摘要：

The waterpower infiltration and sabotage of interlayer crack have a great impact on the working performance of arch dam. In the current paper, combined with an interlayer crack in a 300m-level arch dam, the open-close, sliding and expansion of joints are solved to analyze the waterpower infiltration stabil- ity of the interlayer crack based on the nonlinear iterative method. The results show that if only taking into account the deadweight and the water pressure, the crack is likely to extend upstream and it is difficult to extend downstream. The crack propagation is of low sensitivity for the fracture toughness of concrete, however, showing high sensitive for bond strength after treatment. The loads of temperature can increase the risk of crack propagation; with the conditions of normal load, the crack has little effort on the state of stresses and displacements in arch dam, but has impact on the local area. It will reduce the possibility of the crack propagation slightly when the rock foundation of bank slope is harder than riverbed.