塑料排水板联合真空预压的径向固结理论研究

doi:10.13722/j.cnki.jrme.2018.0846

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摘要基于椭圆柱排水体等效假定，结合真空度在塑料排水板内的线性损失规律，推导得出塑料排水板联合真空预压的径向固结解析解。基于所得解，对比分析塑料排水板的“形状效应”以及相关参数对地基固结的影响。进行实例验算，验证了解答的合理性。结果表明，在考虑塑料排水板的“形状效应”时，椭圆柱体等效法的效果最佳，且基于各周长等效法的计算结果与提出的椭圆柱等效结果较为接近；增大排水板的真空度衰减系数k1和顶部真空负压p0，可达到加快孔隙水的排出、加快地下水位的下降速率、降低最终地下水位线的效果；随着参数κ的增大，地基的整体固结速率减慢。

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	田乙1
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	吴文兵1
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	梅国雄1
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	蒋国盛1
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	宗梦繁1
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关键词 ：地基基础, 塑料排水板, 椭圆柱排水体, 真空预压, 形状效应, 真空度衰减系数

Abstract：Based on the equivalent assumption of elliptic cylindrical drain and the linear loss law of the vacuum degree in the prefabricated vertical drain(PVD)，a solution for calculating the radial consolidation of PVD combined with vacuum preloading was proposed. The shape effect of PVD was discussed and the influence of relevant parameters on the foundation consolidation was analyzed. Case study was performed to validate the rationality of the present solution by the comparison between the settlement curve calculated by the present solution and the measured settlement curve，and the consolidation behavior is detailed investigated on the basis of the present solutions. The results show that，when considering the shape effect of PVD，the elliptic cylinder equivalent method is the optimum choice and the result calculated by the perimeter equivalent method is closer to that by the elliptic cylinder equivalent method. Increasing the loss coefficient of the vacuum degree or the vacuum pressure on the top of PVD can accelerate the discharge of pore water in the foundations，speed up the descent rate of the water table and lower the final water table. As the parameter κ increases，the consolidation rate of the overall foundation slows down.

Key words： foundations prefabricated vertical drain elliptical cylindrical drain vacuum preloading shape effect loss coefficient of vacuum degree

引用本文:

田乙1，2，吴文兵1，2，3，4，梅国雄1，2，3，4，蒋国盛1，2，宗梦繁1，2. 塑料排水板联合真空预压的径向固结理论研究[J]. 岩石力学与工程学报, 2019, 38(10): 2151-2160.
TIAN Yi1，2，WU Wenbing1，2，3，4，MEI Guoxiong1，2，3，4，JIANG Guosheng1，2，ZONG Mengfan1，2. Radial consolidation theory for prefabricated vertical drain combined with vacuum preloading#br#. , 2019, 38(10): 2151-2160.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0846 或 http://www.rockmech.org/CN/Y2019/V38/I10/2151

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