圆形隧道施工对不同深度地层沉降影响的模型试验研究

发布时间：2018-01-09 07:06

本文关键词：圆形隧道施工对不同深度地层沉降影响的模型试验研究　出处：《隧道建设》2017年01期 　论文类型：期刊论文

【摘要】：为了预测圆形隧道施工引起地表以下不同埋深地层沉降特征,首先,通过理论推导不同地层最大沉降位移与沉降槽宽度系数的函数关系;然后,建立包括试验台架、地层模型、圆形隧道开挖模型以及测量地层变形装置的平面应变模型试验系统。通过理论解析和模型试验可知:1)地表以下地层的最大沉降位移与沉降槽宽度系数成反比;2)不同深度地层的沉降位移随着地层埋深的增加而增大,且地表以下地层沉降槽曲线仍然符合正态分布;3)通过对模型试验数据进行回归分析,得到黏土地表以下不同深度地层沉降槽宽度系数的计算公式,从而为预测圆形隧道施工地表以下不同深度地层竖向位移提供了一种可靠的计算方法。
[Abstract]:In order to predict the settlement characteristics of different buried subsurface strata caused by circular tunnel construction, firstly, the functional relationship between the maximum settlement displacement of different strata and the width coefficient of settlement trough is deduced theoretically. Then, the formation model is built including the test stand. Plane strain model test system for circular tunnel excavation model and ground deformation measuring device. By theoretical analysis and model test, we can see: 1). The maximum settlement displacement of subsurface strata is inversely proportional to the coefficient of settlement trough width. 2) the settlement displacement of strata at different depths increases with the increase of buried depth, and the subsurface subsidence trough curve still accords with normal distribution; 3) based on the regression analysis of the model test data, the formula for calculating the width coefficient of settlement trough in different depth below the surface of clay is obtained. It provides a reliable calculation method for predicting the vertical displacement of strata below the surface of the surface of circular tunnel construction.
【作者单位】：北京交通大学土木建筑工程学院;中国建筑第二工程局有限公司;
【分类号】：U456
【正文快照】： 0引言为了缓解交通拥堵问题,越来越多的城市开始修建地铁,而地铁施工引起的地层沉降一直困扰着工程界,诸多学者通过理论解析、模型试验和数值模拟等手段进行了相关研究,取得了一定的成果,其中具有代表性的有,项彦勇[1]详细介绍了预测地层变形的模型试验方法、模型试验的相似材

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