真空预压联合间歇电渗加固疏浚淤泥试验研究
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TU472.99

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国家重点基础研究发展计划(2016YFC0800200);国家自然科学基金(51878402、51678352、51778501、51778500、51620105008);温州市科技计划(S20180002);温州市科学技术协会(2019KXCX-RH5)


Experimental study on dredged slurry improvement by vacuum preloading combined with intermittent electroosmotic
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    摘要:

    沿海地区的疏浚工程产生了大量疏浚淤泥。为了研究疏浚淤泥的处理方法,通过室内模型试验,对温州地区的疏浚淤泥进行了分级真空预压联合间歇电渗的加固处理,并对间歇通电的时间及间歇逐级加压电渗进行了研究。试验过程中监测了真空压力、电流、排水量和土表的沉降;试验之后,对土体含水率、十字板剪切强度以及电极腐蚀质量进行了测量。试验结果表明,虽然间歇通电时间越长,土体固结效果越好,但是间歇通电时长超过24 h时,土体加固效果开始减弱;然而,电极腐蚀质量和间歇电渗的平均能耗系数却依然与间歇通电时长呈正相关。此外,分级真空预压联合间歇逐级加压电渗法相比于分级真空预压联合间歇电渗法获得了更佳的土体加固效果,并且其电极腐蚀质量和间歇电渗的平均能耗系数也显著降低。

    Abstract:

    A large number of dredged slurry are produced in the coastal area. In order to study the treatment methods of dredged slurry, an indoor model test was conducted to improve dredged slurry in Wenzhou area by stepped vacuum preloading combined with intermittent electroosmosis, and the time of intermittent power-on and intermittent stepped voltage electroosmosis were examined. The vacuum pressure, current, drainage and surface settlement were monitored during the test. After the test, the moisture content, vane shear strength of soil and the corrosion quality of electrodes were measured. The test results showed that although the longer the time of intermittent power-on, the better the consolidation effect of soil, when the time of intermittent power-on exceeded 24 hours, the effect of soil improvement began to weaken; however, the corrosion quality of electrodes and the average energy consumption coefficient of intermittent electroosmosis were still positively correlated with the time of intermittent power-on. In addition, compared with the stepped vacuum preloading combined with intermittent electroosmosis method, the stepped vacuum preloading combined with intermittent stepped voltage electroosmosis method obtained better soil improvement, the corrosion quality of electrodes and the average energy consumption coefficient of intermittent electroosmosis of which were also significantly reduced.

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刘飞禹,李哲,袁国辉,王军.真空预压联合间歇电渗加固疏浚淤泥试验研究[J].土木与环境工程学报(中英文),2021,43(5):1-9.

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  • 收稿日期:2020-04-03
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  • 在线发布日期: 2021-07-20
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