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石门拱坝枢纽运行中，曾发生了右坝肩岩体内高压发电隧洞衬砌止水破坏严重渗漏事故。通过检查和对地下水监测资料的长期分析研究，证实了由于隧洞渗漏造成了整个大坝右半部坝基岩体的渗流异常。这在拱坝枢纽中很少见到。
During the operation of Shimen Arch Dam, there was a serious leakage accident of high pressure power generation tunnel lining water stop destruction in the right abutment rock mass. Through the inspection and long-term analysis of the groundwater monitoring data, it is verified that the seepage anomaly of the dam foundation rock mass in the right half of the dam is caused by the tunnel leakage. This is rarely seen in the arch dam.