论文部分内容阅读
基于Mair提出的隧道开挖引起的土体瞬时沉降的理论以及进行的有限元数值模拟结果,推出地表及地表以下不同深度土体长期沉降的计算方法。首先模拟了Ong的离心机试验以验证数值模型的合理性,然后对隧道开挖引起的不同深度处土体长期沉降问题进行了模拟研究,建立了长期和瞬时情况下地层损失率之间的关系,并推导出长期情况下各深度处沉降槽宽度系数和最大沉降值的计算式,从而可确定沉降槽的形状。经与现场实测资料和数值模拟结果对比,验证了方法的合理性,可作为实际工程的借鉴。
Based on the theory of transient settlement of soil caused by tunnel excavation proposed by Mair and the results of finite element numerical simulation, a method for calculating long-term settlement of soils with different depths under the surface and on the surface is proposed. Firstly, the centrifuge test of Ong was simulated to verify the rationality of the numerical model. Then the long-term settlement of soils at different depths caused by tunnel excavation was simulated and the relationship between formation loss rate under long-term and transient conditions was established , And deduced the calculation formula of the settling tank width coefficient and the maximum settlement value at each depth in the long term, so as to determine the shape of the settling tank. Compared with the field measured data and numerical simulation results, the rationality of the method is verified, which can be used as a reference for practical engineering.