基于Peck公式的双线盾构引起的土体沉降预测

发布时间：2018-03-26 05:04

  本文选题：双线平行盾构隧道　切入点：Peck公式　出处：《岩土力学》2014年08期

【摘要】：基于Peck公式,对双线水平平行盾构隧道施工中土体损失引起的三维土体沉降计算方法进行研究。考虑先行隧道施工对后行隧道的影响和两条隧道开挖面的不同位置,建立修正的三维Peck公式;通过分别计算先行盾构隧道和后行盾构隧道施工引起的土体沉降,叠加得到双线水平平行盾构施工引起的总的三维土体沉降。算例分析结果表明:预测值与实测值比较吻合;随着两条隧道开挖面前后距离的逼近,地面最大沉降量会逐渐增大;随着土体深度z的增大,沉降略增大、沉降槽宽度则略减小;当两条隧道轴线水平距离L较小时,地面沉降量较大,符合正态分布规律;随着L的增大,最大地面沉降量会逐渐减小,沉降曲线形状慢慢由V型转变成W型。
[Abstract]:Based on the Peck formula, this paper studies the calculation method of three-dimensional soil settlement caused by soil loss in the construction of double-line horizontal and parallel shield tunnel. The influence of the first tunnel construction on the rear tunnel and the different positions of the excavated surface of the two tunnels are considered. The modified three-dimensional Peck formula is established, and the settlement of soil caused by the construction of the advanced shield tunnel and the rear shield tunnel is calculated respectively. The total three-dimensional soil settlement caused by the double-line horizontal and parallel shield tunneling construction is obtained by superposition. The results of example analysis show that the predicted value is in good agreement with the measured value, and the maximum land subsidence will increase gradually with the distance between the excavated surface of the two tunnels approaching before and after the excavation. With the increase of soil depth z, the settlement slightly increases, and the width of settlement trough decreases slightly. When the horizontal distance between the two tunnels axis L is small, the amount of land subsidence is larger, which conforms to the normal distribution law; with the increase of L, The maximum land subsidence will gradually decrease and the shape of settlement curve will change from V type to W type.
【作者单位】： 浙江大学城市学院土木工程系;
【分类号】：U455.43
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本文编号：1666452