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李家峡水电站导流隧洞封堵施工，在混凝土中采用复合膨胀剂，利用适量体积膨胀在约束条件下产生预压应力，补偿混凝土收缩和温度应力，取消灌浆和冷却水管系统，简化温控措施，保证了蓄水渡汛。同时，对复合膨胀剂混凝土掺量的物理力学和热学性能的特点、膨胀变形规律及有关技术等问题进行了分析研究，为施工提供依据。应用复合膨胀混凝土安全可靠，达到了设计预期目标。可简化工艺、保证质量、降低成本、促进技术进步，取得了较好的技术经济效益。为其它工程类似技术问题，提供参考和借鉴。
In the construction of diversion tunnel of Lijiaxia Hydropower Station, composite expansion agent is used in concrete, and prestressed stress is generated under the restraint conditions by proper volume expansion to compensate concrete shrinkage and temperature stress. The grouting and cooling water pipe system are canceled, the temperature control measures are simplified, The reservoir flood season. At the same time, the physical and mechanical properties of the expansive concrete admixture, the characteristics of the expansion and deformation, the related technology and other issues were analyzed and analyzed, which provided the basis for the construction. The application of composite expanded concrete is safe and reliable, reaching the expected design goal. Can simplify the process, ensure quality, reduce costs and promote technological progress, and achieved good technical and economic benefits. For other projects similar technical problems, provide reference and reference.