Compressibility Behavior of MICP-Treated Sand Treated under Unsaturated Conditions
Compressibility Behavior of MICP-Treated Sand Treated under Unsaturated Conditions
复制标题
非饱和条件下 MICP 处理砂的压缩行为
DOI：
10.1061/9780784484012.032
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Montoya, Brina M.
中科院分区：
文献类型：
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作者：
Ghasemi, Pegah;Liu, Qianwen;Montoya, Brina M.
微生物诱导碳酸钙沉淀（MICP）是一种土壤改良技术，具有满足社会不断扩大的需求的潜力，但对环境的影响很小。在该方法中，细菌的生物活性导致在颗粒-颗粒接触处形成碳酸钙。水泥胶结作用将土颗粒连接在一起，改善了土的工程性质。近年来，该方法在广泛的岩土工程应用中表现出良好的效果，其中土壤稳定主要是在非饱和条件下进行的。然而，非饱和MICP处理土的变形和压缩特性还有待研究。一系列的固结试验进行了未经处理和MICP处理的砂标本。在非饱和条件下，通过渗滤处理试样。试验是在一个修改后的固结装置配备弯曲元件传感器。固结试验结果表明，非饱和MICP处理显着降低土的压缩性。剪切波速度测量与应力增量的突然崩溃中观察到中度胶结标本，是不太明显的轻度和重度胶结标本。
Microbially induced calcium carbonate precipitation (MICP) is a soil improvement technique that has the potential to meet the expanding needs of society with marginal environmental consequences. In this method, biological activities of bacteria lead to formation of calcium carbonate at particle–particle contacts. Precipitated cementation links soil grains together and improves engineering behavior of soil. In recent years, the method has demonstrated promising results in a wide range of geotechnical applications where soil stabilization is mainly performed under unsaturated conditions. However, the deformation and compressibility behavior of unsaturated MICP-treated soil is yet to be investigated. A series of consolidation tests were performed on untreated and MICP-treated sand specimens. Specimens were treated by percolation in unsaturated conditions. Tests were performed in a modified consolidation setup equipped with bender element sensors. Consolidation test results indicated that unsaturated MICP-treatment significantly reduced compressibility of soils. A sudden collapse in shear wave velocity measurements with stress increment was observed in moderately cemented specimens that was less pronounced in lightly and heavily cemented specimens.
化学浓度对 MICP 处理砂的强度和侵蚀性的影响
DOI：
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发表时间：
2019
期刊：
Geo-Congress 2019
影响因子：
--
作者：
Pegah Ghasemi;A. Zamani;B. Montoya
通讯作者：
B. Montoya
滨海沙坡微生物诱导碳酸钙沉淀的现场应用
DOI：
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发表时间：
2020
期刊：
影响因子：
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作者：
Pegah Ghasemi;B. Montoya
通讯作者：
B. Montoya