Shearing and Hydraulic Behavior of MICP Treated Silty Sand
Shearing and Hydraulic Behavior of MICP Treated Silty Sand
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DOI：
10.1061/9780784480489.029
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
A. Zamani;B. Montoya
中科院分区：
文献类型：
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作者：
A. Zamani;B. Montoya
微生物诱导的方解石沉淀（microinduced calcite precipitation， MICP）是发生在土壤内部产生方解石胶结作用的生化反应，将土壤颗粒粘结在一起。在本研究中，将MICP方法应用于内华达砂和含15%粉砂的内华达砂，以评估它们在单调抗剪强度、循环阻力和渗透率变化方面的改善。通过对处理和未处理的样品进行不排水单调和循环直接简单剪切试验来评估抗剪强度特性的变化。方解石沉淀导致的渗透率降低也是本研究的另一个目标，通过对未经处理和MICP处理的样品进行持续的水头测试来研究。结果表明，两种处理试样的剪切响应均有所改善，超孔隙水压力均有所降低。施加MICP也会增加循环电阻。施用MICP降低了土壤的渗透性，但与向内华达砂中添加细粒时的渗透性变化相比，降低的幅度较小。
Microbial induced calcite precipitation (MICP) is a biochemical reaction that takes place within the soil producing calcite cementation bonding soil grains together. In this study, MICP method was applied to both Nevada sand and Nevada sand containing 15% silt to assess their improvement in monotonic shear strength, cyclic resistance and also changes in permeability. The change in shear strength properties are evaluated by performing undrained monotonic and cyclic direct simple shear tests on both treated and untreated samples. Reduction in permeability as a result of calcite precipitation is also another objective of this research which is investigated by performing constant head tests on untreated and MICP treated samples. The results show improvement in shear response and reduction in excess pore water pressure in both treated samples. The cyclic resistance also increases by applying MICP. The permeability of soil reduces by applying MICP but the amount of reduction is low in comparison to the change in permeability when fines are added to the Nevada sand.