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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。
The hydraulic infiltration and destruction of inter-layer cracks will have a great impact on the working performance of arch dam. In this paper, a 300m arch dam with a layer of cracks, based on the nonlinear iterative method to solve the problem of opening, closing, sliding and expansion joints, stability analysis of hydraulic fractures between layers. The results show that: considering only the self-weight and water pressure, the fractures may extend to the upstream side and the downstream side to expand, and the sensitivity to the fracture toughness of concrete is weak. However, for the treated bond strength And the temperature sensitivity and temperature drop load will increase the risk of crack propagation. Under normal load conditions, the crack has little effect on the overall stress and displacement of arch dam, but has some impact on the local area; Hard, it will slightly reduce the possibility of expansion of the crack; further proposed to prevent seepage upstream and drilling to form a drainage channel and other recommendations.