水电站高压竖井的开挖支护施工技术探究

Study on Construction Technology of High Pressure Shaft Excavation and Support of Hydropower Station

结合工程实例和文献报道,在简要阐述开挖支护施工原则的基础上,详细分析了开挖支护施工技术在水电站高压竖井开挖支护中的具体应用。对水电站高压竖井采用"整体顺作法"的总体设计、施工及监测进行了理论与实践研究,使实例基坑支护工程能够保证基坑周边建(构)筑物、地下管线、道路的安全和正常使用,满足主体地下结构施工空间施工期间的安全功能要求。对施工期间的主体地下结构施工空间的观察及基坑监测表明,基坑支护工况良好,具有一定的稳定性和安全性。因此,在水电站高压竖井中科学合理地应用开挖支护施工技术,可有效保证水电站高压竖井的施工质量和稳定性,值得大范围推广应用。

On the basis of a brief description of the construction principles of excavation support,the concrete application of excavation support construction technology in the high pressure shaft excavation and support of a hydropower station is analyzed in details with some project examples and literature and materials. The theoretical and practical research has been done for the general design,construction and monitoring of the General Normal Construction Method of the high pressure shaft of the hydropower station,which enables the example foundation pit support project to ensure the normal running of the surrounding buildings,underground pipelines,and road,satisfying the safety function requirement of the construction space of the main underground structure during the construction period. Observations on the construction space of main underground structure during the construction period and the foundation pit monitoring both show that the working conditions of the foundation pit support are of security and stability. The scientific and rational application of excavation supporting technology in high pressure vertical shaft of hydropower station can effectively guarantee the quality and stability of the high pressure shaft construction of the hydropower station,and it is worth popularizing and applying in a large range.