真空预压联合逐级强夯和电渗法的试验研究
作者:
作者单位:

1.广州环保投资集团有限公司;2.上海大学;3.温州大学

作者简介:

通讯作者:

中图分类号:

TU375.4

基金项目:

国家自然科学基金资助项目(51878402) ;浙江省自然科学基金(LY20E080029)


Experimental study on the vacuum preloading combined with progressive dynamic compaction and electro-osmosis method
Author:
Affiliation:

1.Guangzhou Environmental Protection Investment Group Co., Ltd;2.Shanghai University;3.Wenzhou University

Fund Project:

National Natural Science Foundation of China (No. 51878402); Natural Science Foundation of Zhejiang Province (No. LY20E080029)

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    摘要:

    真空预压联合电渗法常用于疏浚淤泥地基处理,但存在排水板淤堵以及电极腐蚀严重、能耗大等问题,导致该法在实际应用中受限。本文提出真空预压-低能量逐级加能强夯联合电渗法来克服传统联合法的缺陷,通过5组室内模型对比试验,采用孔压消散比PPDR确定强夯启动时间,研究最优强夯启动时间点。试验过程中监测土体的孔隙水压力、排水量、土表沉降和电流强度,在试验前后测量土体含水量、十字板剪切强度及阳极腐蚀量。研究结果表明:与真空预压联合电渗法相比,在真空预压阶段启动强夯可使淤堵土柱开裂,有效提高真空预压的排水效率;强夯后土体表面裂缝减少,整体性更好,电渗固结过程产生的阳极腐蚀量和能耗降低;在PPDR为70%启动强夯,土体的排水量增大11.99%,土表沉降增大41.11%,处理后的十字板剪切强度达到65kPa,获得了更好的处理效果。

    Abstract:

    Vacuum preloading combined with electro-osmosis is one of the most commonly used method to treat dredged slurry, but there are problems such as blockage of drainage boards,serious electrode corrosion and high energy consumption which lead to the limitation of the method in practical engineering. In order to overcome the shortcomings of vacuum preloading combined with electro-osmosis method, this paper proposes a vacuum preloading-low energy step-by-step energy dynamic compaction combined with electro-osmosis. Through five groups of indoor model contrast tests, the pore pressure dissipation ratio (PPDR) was used to determine the dynamic compaction start-up time, and the optimal dynamic compaction start-up time point was studied. During the tests, the pore water pressure, drainage volume, surface settlement and current strength of soil were monitored. The water content, vane shear strength and anodic corrosion were measured before and after the test. The test results show that: compared with the test group of vacuum preloading combined with electro-osmosis method, the dynamic compaction in the vacuum preloading stage can crack the soil column caused by silting and effectively improve the drainage efficiency; after dynamic compaction, the cracks on the soil surface are reduced and the integrity is better which the amount of anodic corrosion and energy consumption in the process of electro-osmosis consolidation are decreased; the drainage and the surface settlement increase by 11.99% and 41.11% respectively when PPDR is 70% and the shear strength after treatment reaches 65kPa and a better treatment effect is obtained.

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  • 收稿日期:2021-07-05
  • 最后修改日期:2021-08-24
  • 录用日期:2021-10-15
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