真空加载方式对排水板滤膜淤堵影响试验研究

发布时间：2018-03-07 05:20

本文选题：新近吹填淤泥　切入点：真空加载方式　出处：《岩土工程学报》2016年S2期 　论文类型：期刊论文

【摘要】：塑料排水板滤膜的淤堵直接影响到真空预压排水固结法加固新近吹填淤泥的效果,而真空荷载加载方式是引起排水板滤膜淤堵的主要原因之一。通过室内模型试验,采用5种不同等效直径的排水板滤膜并通过控制不同的真空加载方式加固新近吹填淤泥。试验过程中对泥面沉降、排水板和土中不同深度的真空度进行监测,试验结束后测试排水板滤膜的渗透系数。试验结果表明:真空荷载不分级或者分级梯度太大,对真空预压排水固结法加固新近淤泥效果较差,排水板滤膜容易产生淤堵;排水板滤膜的等效孔径越小其淤堵情况越严重。排水板滤膜发生淤堵后其渗透系数将降低,对土体的排水固结产生不利的影响。作者建议:在真空预压处理新近吹填淤泥的工程实践中,宜选用较大的排水板滤膜等效孔,真空荷载宜采用分级加载方式,且每级真空梯度不宜过大。
[Abstract]:The blockage of plastic drainage plate membrane directly affects the effect of vacuum preloading drainage consolidation method to reinforce the newly blown silt, and the vacuum load loading mode is one of the main reasons for the membrane blockage. Five kinds of drainage plate membrane with different equivalent diameters were used to reinforce the newly blown silt by controlling different vacuum loading methods. During the test, the settlement of mud surface, the vacuum degree of different depth of drainage board and soil were monitored. At the end of the test, the permeability coefficient of the filter membrane of the drainage plate is tested. The results show that the vacuum load is not classified or the gradient is too large, so the effect of the vacuum preloading drainage consolidation method on the reinforcement of the new silt is poor, and the filter membrane of the drainage plate is easy to be silted. The smaller the equivalent pore diameter of the drainage plate membrane, the more serious the blockage. The author suggests that, in the engineering practice of vacuum preloading treatment of newly filled silt, it is advisable to select a large equivalent hole in the membrane of drainage plate, and to adopt the method of graded loading under vacuum loading. And the vacuum gradient of each stage should not be too large.
【作者单位】：南京水利科学研究院岩土工程研究所;福建省建筑设计研究院;交通运输部天津水运工程科学研究院;
【基金】：水利部公益性行业科研专项经费项目(201401006);水利部公益性行业科研专项经费项目(201501043) 国家自然科学基金项目(51408381)
【分类号】：TU447;TU472.33

【相似文献】