Biogrouting coarse materials using soil-lift treatment strategy
Biogrouting coarse materials using soil-lift treatment strategy
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DOI：
10.1139/cgj-2016-0167
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发表时间：
2016-07
影响因子：
3.6
通讯作者：
Aamir Mahawish;A. Bouazza;W. Gates
中科院分区：
文献类型：
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作者：
Aamir Mahawish;A. Bouazza;W. Gates
本文探讨了采用土提升法处理粗砂的可行性，以期将其应用于碎石桩-砂桩和夯土桩类型的应用中。本研究采用两相渗滤法，第一相为巴氏孢子八叠球菌菌悬液，第二相为胶结液。每两次治疗重复该过程。研究表明，土壤升降次数的增加对生物胶结粗砂的力学性能产生负面影响。然而，本研究中达到的最小强度和刚度（2.8 MPa）足以减轻安装过程中可能发生的土柱坍塌或过度径向膨胀。此外，它表明，一个单一的电梯处理可以导致非常高的增加强度和刚度（高达8.9 MPa和2.3 GPa，分别）。然而，方解石分布...
This paper investigates the feasibility of using a soil-lift biogrouting treatment strategy to improve the mechanical properties of coarse sand with the view of applying it to stone columns – sand piles and rammed earth columns type of applications. A two-phase percolation approach was adopted in this study that included percolating a bacterial suspension Sporosarcina pasteurii in the first phase and a cementation solution in the second phase. This process was repeated every two treatments. The study reveals that an increase in the number of soil lifts negatively influenced the mechanical properties of the biocemented coarse sand. However, the minimum strength and stiffness achieved (2.8 MPa) in this study was sufficient to mitigate slumping of a soil column that may occur during installation or excessive radial expansion. Furthermore, it is shown that a single lift treatment can lead to a very high increase in strength and stiffness (up to 8.9 MPa and 2.3 GPa, respectively). However, calcite distribution...