BEHAVIOR OF VERTICAL DRAIN IMPROVED SUBSOIL UNDER EMBANKMENT LOADING
BEHAVIOR OF VERTICAL DRAIN IMPROVED SUBSOIL UNDER EMBANKMENT LOADING
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DOI：
10.3208/sandf.35.4_49
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发表时间：
1995-12
影响因子：
3.7
通讯作者：
J. Chai;N. Miura;S. Sakajo;D. Bergado
中科院分区：
文献类型：
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作者：
J. Chai;N. Miura;S. Sakajo;D. Bergado
摘要为了分析平面应变条件下垂直排水沟的作用，提出了一种基于井阻的拟合方法。该方法的优点是不仅能拟合轴对称平面应变条件下的平均水平固结度，而且能得到更符合实际的水平方向超静孔压分布。该方法被纳入有限元分析，它被证明，一半的排水间距可以模拟一列的元素。最后，以某垂直排水板加固路堤为例进行了分析。结果表明，竖向排水板对地基土的沉降有两种影响：（1）增加沉降速率;（2）减小侧向位移。对于所分析的情况，所使用的垂直排水管没有过滤器。为了与地表沉降相匹配，发现约1.5 m3/年的低排放能力（固定涂抹效应）。分析结果与实测值进行了比较，发现随着排水管套（壁）围压的增加，排水能力会显著降低。
ABSTRACT In order to analyze the effect of vertical drains in plane strain condition, a new matching procedure based on well resistance is proposed. The advantage of this procedure is that it not only matches the average degree of horizontal consolidation in axisymmetric by plane strain condition, but also yields a more realistic excess pore pressure distribution in horizontal direction. The method was incorporated into finite element analysis, and it was demonstrated that half of the drain spacing could be modelled by one-column of elements. Then, an actual case history of an embankment on vertical drain improved subsoil was analyzed by the proposed method. It was shown that vertical drains have two effects on subsoils response: (1) increasing settlement rate, and (2) reducing lateral displacement. For the case analyzed, the vertical drain used was without a filter. For matching the surface settlement, a low discharge capacity of about 1.5 m3/year was found (fixed smear effect). The analysis results were compared with measured values, and it was found that discharge capacity may be reduced significantly with an increase of confining pressure on the sleeve (wall) of the drain.