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湛江湾跨海盾构隧道竖井开挖深度大,地处深厚砂层,其围护结构受力条件复杂。根据该工程所处地质环境和围护结构设计特点,采用地层结构有限元增量法,详细模拟盾构竖井的施工过程,重点分析竖井围护结构的水平位移及受力规律,并与实测进行对比,得出以下结论:由于所处地层较软和加固土体的作用,导致始发井连续墙后靠背侧水平位移随深度呈横向“W”型分布,接收井各侧面水平位移呈横向“V”型分布;计算和实测均表明接收井施工过程的高风险工况为开挖至第5层和第6层处;接收井的水平位移及钢筋应力计算值与实测结果趋势较吻合。其分析方法和监测成果可为今后沿海深厚砂层深挖盾构竖井的设计与施工提供参考。
Zhanjiang Bay cross-shield tunnel shaft excavation depth, is located in the deep sand, the envelope of the complex stress conditions. According to the geological environment and the design features of the envelope, the finite element method of incremental stratum structure is adopted to simulate the construction process of the shield shaft in detail. The horizontal displacement and stress laws of the shaft envelope are analyzed emphatically, By comparison, we can draw the following conclusions: Due to the weakness of the strata and the effect of soil reinforcement, the horizontal displacement of the back of the continuous wall in the initial well is horizontal and “W” -shaped. The horizontal displacement of each side of the well is Horizontal and “V” type distributions. The calculated and measured results show that the high-risk working conditions of the receiving well construction are excavation to the fifth and sixth floors; the horizontal displacements of the receiving wells and the calculated values of the bar stress and the trend of the measured results More consistent. The analysis methods and monitoring results can provide references for the design and construction of shield tunneling shaft deep deep coastal sand.