砂-黏复合地层盾构地表沉降分析及沉降槽宽度系数修正

发布时间：2018-01-19 15:38

本文关键词： 盾构法施工砂-黏复合地层横向沉降沉降槽宽度系数最大沉降量　出处：《铁道标准设计》2017年09期 　论文类型：期刊论文

【摘要】：以深圳地铁11号线宝安站—碧海站区间为工程背景,选择具有正态分布性质且能考虑沉降槽偏移的高斯峰值函数,对该段地表实测沉降数据进行曲线拟合,分析砂-黏复合地层条件下盾构掘进引起的地表沉降规律;并结合国内外沉降槽宽度系数的计算理论,提出砂-黏复合地层沉降槽宽度系数。结果表明:高斯峰值函数拟合的沉降槽曲线与砂-黏复合地层条件下的工程实际更为契合;通过选取合适的参数,可以运用日本学者竹山·乔公式对砂-黏复合地层地表最大沉降值进行预测,砂-黏复合地层地表最大沉降值随土的弹性模量的加权平均值的增大而减小;提出的砂-黏复合地层沉降槽宽度系数更能反映砂-黏复合地层特征,使沉降计算值更准确。
[Abstract]:Based on the engineering background between Baoan station and Bihai station of Shenzhen Metro Line 11, Gao Si peak value function, which has normal distribution and can consider the migration of subsidence trough, is selected to fit the measured settlement data of this segment. The surface subsidence law caused by shield tunneling under the condition of sand and viscosity composite strata is analyzed. Combined with the calculation theory of width coefficient of settling tank at home and abroad. The results show that the curve of subsidence trough fitted by Gao Si's peak value function is more consistent with the engineering practice under the condition of sand and viscosity composite formation. By selecting the appropriate parameters, the maximum subsidence value of the sand and viscous composite strata can be predicted by using the Japanese scholar Takayama Joe formula. The maximum settlement value of the sandy clay composite strata decreases with the increase of the weighted average value of the elastic modulus of the soil. The width coefficient of settlement trough in sand-viscosity composite strata can reflect the characteristics of sand-viscosity composite strata and make the settlement calculation more accurate.
【作者单位】：同济大学道路与交通工程教育部重点实验室;上海市隧道工程轨道交通设计研究院;
【分类号】：P642.26;U455.43
【正文快照】： 盾构法作为常用的隧道施工方法,与矿山法和明挖法相比,具有施工速度快、安全性高等特点,因此已成为城市隧道施工的主要方法。虽然盾构法理论与施工技术逐渐成熟,但在施工中仍存在地表沉降、工作面稳定等工程问题,其中盾构工作面引起周围土体扰动及引起的地表沉降则是最常见的

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