不同类型滤膜排水板真空预压现场试验研究

发布时间：2018-02-25 22:37

本文关键词： 新近吹填淤泥现场试验加固机理加固效果土柱　出处：《水运工程》2017年02期 　论文类型：期刊论文

【摘要】：随着港口建设的快速发展,高效、快速处理新近吹填淤泥成为迫切需要解决的问题。在现场试验的基础上,结合各项监测及检测结果,分析真空预压加固机理,对比不同类型滤膜排水板的加固效果,并研究不同类型滤膜排水板的淤堵情况。试验结果表明:采用防泥蝶形接头直接连接排水板和钢丝软管,可很好地提高真空度的传递效率,管到排水板的真空度损失小;抽真空过程中,土中细颗粒随着水向排水板附近移动形成"土柱",距排水板越远,孔压消散越差,土体的剪切强度越小,结合孔压监测数据和土体剪切强度值分析得到"土柱"的深度范围为1.5~2.0 m,进口滤膜排水板的处理效果优于合资滤膜排水板,普通滤膜排水板处理效果最差;处理后排水板的渗透系数仍能满足设计要求,土体的渗透系数随着距排水板距离的减小而减小,板间土处理较差主要原因是"土柱"阻碍了真空度向周围土体的传递。
[Abstract]:With the rapid development of port construction, rapid treatment of newly filled silt has become an urgent problem to be solved. On the basis of field tests, combined with the monitoring and testing results, the mechanism of vacuum preloading reinforcement is analyzed. The reinforcement effect of different types of membrane drainage board was compared, and the silt blockage of different types of membrane drainage board was studied. The test results showed that the mud proof butterfly joint was used to connect the drainage board and steel wire hose directly. The transfer efficiency of vacuum degree can be improved very well, the loss of vacuum degree from pipe to drain plate is small, and in the process of vacuum pumping, fine particles in soil move with water to form a "soil column" near the drainage plate, the farther away from the drain plate, the worse the pore pressure dissipates. The smaller the shear strength of soil is, the deeper range of "soil column" is obtained by combining pore pressure monitoring data and soil shear strength value, and the treatment effect of imported membrane drainage board is better than that of joint-venture membrane drainage board. The permeability coefficient of the treated plate can still meet the design requirements, and the permeability coefficient of the soil decreases with the decrease of the distance from the drainage plate to the drainage plate. The main reason for the poor treatment of soil between plates is that the "soil column" hinders the transfer of vacuum degree to the surrounding soil.
【作者单位】：上海东华建设管理有限公司;
【分类号】：U655.54

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