坝下涵管事故原因及教训

江西某水库采用水平定向钻法建造了一条坝下涵管,但运行仅几个月即发生垮塌。为深入探讨水平定向钻法在水库工程中应用的可行性,采用复核计算和层次分析的方式,分析了事故原因,结合水库工程的特点,从设计、施工、管理等方面总结了经验教训。主要结论是:将水平定向钻法应用于水利工程在理论上和技术上是可行的,但是不但要做到设计合理、指标明确、选材合适,还要把握钻进泥浆的配比、注浆压力的选取以及回填灌浆等关键技术,严格施工管理,这样才能保证工程安全运行。

Cause Analysis and Lessons of the Accident on Dam Culvert

A new dam culvert was built using the horizontal directional drilling method in a reservoir of Jiangxi Province, but it collapsed after a few months of operation. In order to explore the feasibility of the horizontal directional drilling method in the reservoir engineering, the causes of the accident were analyzed using the recomputation and analytic hierarchy process. Moreover, the characteristics of reservoir engineering were considered, which provided the lessons from the aspects of design, construction, and management. The results indicated that the horizontal directional drilling method is feasible theoretically and technically. However, a reasonable design, a straightforward target, and an appropriate selection of material were required to ensure the safe operation of the project with the assurance of the key technologies such as the drilling mud ratio, grouting pressure, and backfill grouting, and the strict construction management.