The karst is strongly developed in Dazhiping tunnel, where the hydrogeological condition and geological structure is complex, so the construction is difficult. Curtain grouting technique is applicable to water-rich fault zone and weak rock tunnel construction. This article mainly introduces the construction and disaster treatment of Dazhiping 990 cavity in detail, which can provide experience for similar engineering.%大支坪隧道岩溶发育强烈，水文地质条件和地质构造复杂，施工难度大。帷幕注浆技术适用于富水断层带和软弱围岩隧道施工，本文主要从大支坪990溶腔的施工、灾害治理措施进行了比较详细的介绍，可为同类型工程提供经验借鉴。
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