Vertical barrier made of reactive magnesium-activated slag-bentonite for risk control project

被引：0

作者：

Ni H. ^{[1
]}

Fan R. ^{[2
]}

Liu D. ^{[3
]}

Song D. ^{[3
]}

Du Y. ^{[1
]}

Liu W. ^{[1
]}

机构：

[1] Institute of Geotechnical Engineering, Southeast University, Nanjing

[2] College of Environmental Science and Engineering, Donghua University, Shanghai

[3] Beijing Zhongyan Technology Co., Ltd., Beijing

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2021年 / 51卷 / 04期

关键词：

Barrier; Deep soil mixing; High pressure jet grouting; Hydraulic conductivity; Reactive magnesium oxide-activated slag-bentonite; Unconfined compressive strength;

D O I：

10.3969/j.issn.1001-0505.2021.04.011

中图分类号：

学科分类号：

摘要：

Based on the risk prevention and control project of a contaminated site in a pesticide factory, a barrier material was prepared by three-stage mixing process, and the reactive magnesium oxide-activated slag-bentonite vertical barrier (MSB) with a perimeter of 659 m and a depth of 25 m was constructed by high pressure jet grouting and deep soil mixing methods, realizing the engineering application of MSB material in China. After construction, the barrier was sampled, and the core apparent characteristic analysis, unconfined compression and rigid-wall hydraulic conductivity tests were conducted to investigate the influences of two construction methods, barrier depth, and curing time on the unconfined compressive strength qu and the hydraulic conductivity k. The results show that two construction methods can mix the material evenly along the barrier depth and the integrity of the core samples is satisfactory. The qu values of the MSB samples are in the range of 1.6 MPa to 2.6 MPa after curing for 40 d to 70 d, and increase with increasing curing time. The k values of the core samples permeated with tap water are in the range of 4.5×10-8cm/s to 9.0×10-8 cm/s. The k values are found to vary insignificantly with the sampling depth. © 2021, Editorial Department of Journal of Southeast University. All right reserved.

引用

页码：625 / 630

页数：5

共 19 条

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