以宜万铁路8座I级复杂岩溶高风险隧道之一的大支坪隧道为背景，通过施工方案、防风险措施的不断研究与实践，总结出了复杂岩溶隧道规避风险、安全施工、防水害、结构安全的较成功的应对措施。

Based on Dazhiping Tunnel that is one of the eight complex karst tunnels with high construction risk on Yichang-Wanzhou railway, by unceasing study and practice on construction schedule and risk prevention measures, a series of successful treatment measures aiming at preventing risk, ensuring safe construction, preventing water disaster and ensuring structure safety were summrized.