砂-粘土复合地层盾构隧道地表沉降规律研究

发布时间：2018-04-05 10:56

本文选题：砂-粘土复合地层　切入点：盾构隧道　出处：《现代隧道技术》2017年05期

【摘要】：文章依托深圳地铁11号线宝—碧区间盾构隧道工程,基于现场实测地表沉降数据和数值模拟分析,探究砂-粘土复合地层盾构隧道施工引起的地表沉降规律。采用高斯峰值函数对隧道横断面沉降数据进行拟合,得到沉降槽宽度系数、最大沉降量和地层损失率等表征横断面沉降特征的重要参数。与软土地层和砂卵石地层沉降槽宽度系数比较,砂-粘土复合地层沉降槽宽度系数小于软土地层且大于砂卵石地层。采用数值模拟计算结合实测数据的方法,研究了在砂-粘土复合地层中隧道埋深、上覆地层条件和隧道洞身处地层条件对地表沉降的影响。研究结果表明,地表沉降受上覆地层条件影响显著,与接近地表地层性质密切相关。
[Abstract]:Relying on the shield tunneling project of Bao-Bi section of Shenzhen Metro Line 11, based on the field measured ground subsidence data and numerical simulation analysis, this paper explores the ground subsidence law caused by the construction of shield tunnel in sand and clay composite strata.Gao Si peak value function is used to fit the settlement data of tunnel cross section, and the important parameters such as width coefficient, maximum settlement and loss rate of stratum are obtained.Compared with the coefficient of sedimentation trough width in soft soil layer and sand pebble formation, the width coefficient of sedimentation trough in sand clay composite formation is smaller than that in soft soil formation and is larger than that in sand pebble formation.In this paper, the influence of tunnel depth, overlying formation conditions and tunnel hole formation conditions on surface subsidence in sandy clay composite strata is studied by means of numerical simulation calculation combined with measured data.The results show that the surface subsidence is significantly affected by the overlying stratigraphic conditions and is closely related to the properties of the near-surface strata.
【作者单位】：上海市基础工程集团有限公司;
【分类号】：P642.26;U455.43

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