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An improved method to calculate the vertical earth pressure for deep shield tunnel in Shanghai soil layers

机译:上海市深层盾构隧道竖向土压力计算的一种改进方法。

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Previous studies on field monitoring data indicate that vertical earth pressure would be overestimated by the Terzaghi theory for a deeply buried shield tunnel, which is widely adopted in tunnel design. A kinematic mechanical model was proposed to evaluate its influence on vertical earth pressure and implementation into the finite element program in this paper. To investigate the vertical earth pressure, a numerical study using the commercial software of PLAXIS was conducted on the vertical earth pressure distribution on a single shield tunnel, considering different tunnel diameters and burial depths in sandy and clay layers, such as Shanghai soil strata. Based on finite element model results, the existing problems such as soil displacement around tunnel, earth pressure distribution, collapsed soil mass width and sliding friction in the Terzaghi loosening earth pressure formula for a sand layer were discussed. Then, a feasible calculation method for vertical earth pressure on the tunnel lining was proposed. Through comparisons between calculated results and field measurements, the improved formulas were verified, providing a reference for future designs of deep underground structures in Shanghai Soil Layers.
机译:先前对现场监测数据的研究表明,对于地下深埋的盾构隧道,特扎吉(Terzaghi)理论会高估竖向土压力,而盾构隧道已被广泛采用。提出了一个运动力学模型,以评估其对垂直土压力的影响,并将其应用于有限元程序中。为了研究垂直土压力,使用PLAXIS的商业软件对单个盾构隧道的垂直土压力分布进行了数值研究,考虑了不同的隧道直径和沙土和黏土层(例如上海土壤地层)中的埋藏深度。基于有限元模型的结果,讨论了Terzaghi松土层压力公式中存在的问题,例如隧道周围的土体位移,土压力分布,土体塌陷宽度和滑动摩擦。然后,提出了一种可行的隧道衬砌竖向土压力计算方法。通过对计算结果与现场测量结果的比较,验证了改进后的公式,为上海土层深层地下结构的未来设计提供参考。

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