塑料排水板处理地基固结特性研究

发布时间：2018-01-13 06:32

本文关键词：塑料排水板处理地基固结特性研究　出处：《长江科学院院报》2017年02期 　论文类型：期刊论文

【摘要】：目前塑料排水板(Prefabricated Vertical Drains,PVD)处理地基的固结计算均采用传统的砂井等效法,其等效直径可通过较多计算式得到,如周长等效法、周长折减0.75倍等效法(《海堤工程设计规范》(GB/T 51015—2014))等,但目前还没有形成统一的认识。基于等应变假设,类比于砂井地基固结理论,重新推导了排水板地基固结解析解,并通过ADINA有限元软件验证其合理性。然后采用有限元法对排水板地基固结的二维(2D)模型(即排水板渗透系数kw→+∞时)进行研究,认为在2D固结模型下Long和Covo(1994)的砂井等效法与有限元计算成果较接近,但仍存在一定偏差。最后,给出了2D固结模型下精度更高的等效直径计算式。该研究对排水板处理地基固结有参考作用。
[Abstract]:At present, the consolidation calculation of prefabricated Vertical drains PVD for the treatment of the foundation adopts the traditional sand well equivalent method. The equivalent diameters can be obtained by many calculation formulas, such as the equivalent method of circumference, the equivalent method of 0.75 times reduction of circumference ("Design Code for Seawall Engineering") and so on (GBP / T 51015-2014) and so on. But at present there is no unified understanding. Based on the assumption of equal strain, the analytical solution of consolidation of drainage plate foundation is rededuced by analogy to the consolidation theory of sand well foundation. The rationality of the method is verified by ADINA finite element software, and then the 2D / 2D model of the consolidation of drainage slab foundation is adopted (i.e., the permeability coefficient of drainage plate KW). 鈫扞t is considered that the equivalent method of sand well in 2D consolidation model is close to the result of finite element calculation, but there is still some deviation. Finally. The equivalent diameter calculation formula with higher precision under 2D consolidation model is given, which can be used as a reference for the treatment of foundation consolidation by drainage plate.
【作者单位】：浙江省水利水电勘测设计院;
【基金】：浙江省水利水电勘测设计院科标业项目(B1608,B1609) 水利部公益性行业科研专项(201401010)
【分类号】：TU472
【正文快照】： 1研究背景竖井排水固结法是岩土工程界最经济、最常用的一种软土地基处理方法,而塑料排水板由于价格低廉而被普遍应用。众所周知,排水板截面为扁矩形,其长宽比一般为20~40,这样不但便于施工运输(能卷成一团),并且其排水效果也比同等材料用量下(等面积)的圆形截面排水效果更好[

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