排水板周围土体径向固结室内模型试验研究

发布时间：2018-01-20 02:15

  本文关键词： 真空预压 真空负压源 吹填土 固结沉降 模型试验　出处：《岩土工程学报》2016年S1期 　论文类型：期刊论文

【摘要】：考虑真空负压沿排水板的衰减分布对排水板周围土体固结特性的影响,开展室内模型试验模拟某一深度处预压地基排水体中真空负压对其周围土体径向固结的过程。通过分析排水板周边土体基本物理力学性质、渗透性、压缩性及土颗分的时空分布特点,研究不同真空负压强度对排水板周围土体径向固结的影响。试验结果表明随着真空度沿着排水体的衰减,排水板对周围土体的影响范围逐渐缩小,在软基深部有大面积的交叉影响区,对软基浅部优于深部;细微颗粒在真空负压差作用下发生向着排水板方向运移并,使得在排水板周围细颗粒含量增大,远端细微颗粒减少;基于真空渗流场理论,结合颗分试验结果,分析了真空预压过程中细颗粒运移成因,进一步解释了"土桩"形成机理。
[Abstract]:The influence of the attenuation distribution of vacuum negative pressure along the drainage plate on the consolidation characteristics of soil around the drainage plate is considered. The laboratory model test was carried out to simulate the radial consolidation process of the surrounding soil by vacuum negative pressure in a certain depth of pre-compressed foundation drainage water. The basic physical and mechanical properties and permeability of the soil around the drainage plate were analyzed. The influence of different vacuum negative pressure strength on the radial consolidation of soil around the drainage plate is studied. The experimental results show that the vacuum decreases along the drainage body with the vacuum degree. The influence range of drainage plate on surrounding soil is gradually reduced, there is a large area of cross influence area in the deep of soft foundation, and the shallow part of soft foundation is better than that of deep; The fine particles moved towards the drainage plate under the vacuum negative pressure difference, which increased the fine particle content around the drainage plate and decreased the fine particles at the far end. Based on the theory of vacuum seepage field and the results of particle sub-test, the causes of fine particle migration during vacuum preloading are analyzed, and the formation mechanism of "soil pile" is further explained.
【作者单位】： 交通运输部天津水运工程科学研究所;河海大学岩土力学与堤坝工程教育部重点实验室;河海大学岩土工程科学研究所;天津市勘察院;
【基金】：中央高校科研业务费项目(B15020060)
【分类号】：TU411
【正文快照】： 0引言随着城市发展建设土地需求量日益增加,吹填造陆已成为濒海、河、湖地区城市发展,改变土地紧缺现状的必由之路。目前吹填软土地基处理多采用真空预压法[1-2]。国内外对于真空预压法加固吹填土开展大量的室内试验研究其加固机理。陈环等[3]通过室内模型试验对负压条件下土，

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