王滩电站地下水泵房深基坑的开挖方案及稳定性分析

Excavation Program and Stability Analysis of Deep Foundation Pit for Underground Pump House of Wangtan Power Station

研究目的:通过现场勘察、调研,理论分析与计算机模拟,对王滩电站地下泵房深基坑开挖方案及稳定性进行研究,旨在保证基坑安全稳定、满足工期要求的情况下,采用最经济合理的施工方案和方法。研究方法:从技术、施工、经济等方面对王滩电站地下泵房深基坑开挖方案及开挖方法进行讨论和比选,并结合计算机技术对不同开挖方法的过程进行模拟计算分析。研究结论:理论与工程实践结果表明,采用半放坡开挖(从地面标高3.5 m到地下-9 m)和地下连续墙(从-9 m到-13.5 m)相结合的方案,基坑稳定,施工简单、经济效益好,既保证了施工质量,也满足了工期要求。

Research purposes： Through making the site survey, investigation, theoretic analysis and computer simulation, the researches are made on the excavation program and stability analysis of deep foundation pit for underground pump house Wangtan Power Station for the purposes of adopting the most economic and reasonable construction program and method based on the premise of guaranteeing the safety and stability of foundation pit and satisfying the requirement of construction schedule. Research methods： The discussion and comparison are made for the excavation programs and methods of deep foundation pit for underground pump house of Wangtan Power Station from the areas of technology, construction and economy, and the simulation computing and analyses are also made for the processes of different excavation methods with computer technology. Research conclusions：The theory and engineering practices show not only the construction quality can be guaranteed, but also the requirement of construction schedule can be satisfied by adopting the program of combining the method of excavation on half slope from 3.5 m of ground elevation to - 9 m underground with the method of underground continuous wall from -9 m to - 13.5 m. In this way, the foundation is stable, construction is easy and the good economic benefits can be obtained.