分级真空预压联合间歇电渗法加固疏浚淤泥宏微观分析

doi:10.13722/j.cnki.jrme.2020.0163

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摘要为解决真空预压联合电渗法中的排水板淤堵及电渗能耗大的问题，提出分级真空预压联合间歇电渗法。通过4组室内模型试验，对土体加固过程中的排水量、土表沉降量进行监测，并评估试验后的土体加固效果，探究分级真空预压联合间歇电渗法对于真空预压联合电渗法在土体加固和淤堵效应方面的改进效果。此外，借助扫描电镜获得土体微观结构图片，并通过图像处理软件分析真空预压联合电渗法和分级真空预压联合间歇电渗法处理后土体孔隙特征的变化。试验结果表明：分级真空预压联合间歇电渗法中，分级施加真空压力的方式能缓解排水板淤堵；且间歇通电的方式能减小阳极腐蚀，增大土体电流来促进土体排水。与常规真空预压联合电渗法相比，分级真空预压联合间歇电渗法的排水量和十字板剪切强度分别增加13.2%和19.2%，土体含水率减小13.7%，改善效果十分显著。分级真空预压联合间歇电渗法处理后土体的表观孔隙率、孔隙数和平均孔隙面积更大，土体排水通道畅通有助于排水，且土体孔隙排列更有序，孔隙形态更复杂。

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	刘飞禹1
	张志鹏1
	王军2
	袁国辉2
	符洪涛2

关键词 ：土力学, 分级真空预压, 间歇电渗, 扫描电镜, 微观结构

Abstract：In order to solve the problems of blockage of drainage plate and large energy consumption in vacuum preloading combined with electroosmosis(VPEO)，a combination method of stepped vacuum preloading and intermittent electroosmosis(SVPIEO) was proposed. Four sets of indoor model tests were carried out，and the water discharge and the surface settlement of soil were monitored. The reinforcement effect was evaluated，and the improvement effect of SVPIEO on VPEO in soil reinforcement and silting was investigated. In addition，the soil microstructure images were obtained by means of scanning electron microscopy，and the changes of soil pore characteristics after VPEO and SVPIEO were analyzed by image processing software. The experimental results show that，for SVPIEO，applying stepped vacuum pressure can alleviate the drainage board blockage，and intermittent energization can reduce anodic corrosion and increase soil current to promote soil drainage. Compared with VPEO，the water discharge and the vane shear strength of soil by SVPIEO increase by 13.2% and 19.2% respectively，and the soil moisture content decreases by 13.7%，showing significant improvement effect. After treatment by SVPIEO，the apparent porosity，number of pores and average pore area of the soil are larger. The smooth drainage channel of the soil helps drainage，and the soil pores are arranged more orderly and the pore shape is more complicated.

Key words： soil mechanics stepped vacuum preloading intermittent electroosmosis scanning electron microscopy microstructure

引用本文:

刘飞禹1，张志鹏1，王军2，袁国辉2，符洪涛2. 分级真空预压联合间歇电渗法加固疏浚淤泥宏微观分析[J]. 岩石力学与工程学报, 2020, 39(9): 1893-1901.
LIU Feiyu1，ZHANG Zhipeng1，WANG Jun2，YUAN Guohui2，FU Hongtao2. Macro and micro analyses of stepped vacuum preloading combined with intermittent electroosmosis for treating dredger slurry#br#. , 2020, 39(9): 1893-1901.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0163 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I9/1893

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