| 化学处理方式对微生物固化砂土强度影响研究 |
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| 引用本文： | 崔明娟,郑俊杰,章荣军,苗晨曦,张君洁.化学处理方式对微生物固化砂土强度影响研究[J].岩土力学,2015,36(Z1):392-396. |
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| 作者姓名： | 崔明娟 郑俊杰 章荣军 苗晨曦 张君洁 |
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| 作者单位： | 华中科技大学 岩土与地下工程研究所，湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金（No.51278216，No.51478201）；教育部高等学校博士学科点专项科研基金（No.20130142120029）；研究生创新创业项目经费（No.2015650011）。 |
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| 摘 要： | 微生物固化(microbial-induced calcite precipitation, 简称为MICP)技术是岩土工程领域新兴起的一种地基处理技术，利用微生物诱导产生的碳酸钙晶体胶结松散土颗粒，改善土体的力学特性。选用巴氏芽孢杆菌作为固化细菌，采用单一浓度（0.5、1.0 mol）和多浓度相结合（前期采用0.5 mol，后期采用1.0 mol）的化学处理方式注射胶结液（尿素/氯化钙混合液），研究化学处理方式对微生物固化砂土强度的影响。基于试验测试分析了固化砂土试样的强度、破坏模式以及碳酸钙含量。试验结果表明，化学处理方式对固化砂土试样的强度有显著影响，对破坏模式和碳酸钙含量无明显影响；多浓度相结合的化学处理方式能够以较少的灌浆次数获取较高强度的试样。最后，对化学处理方式对强度影响的机制进行深入分析。
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| 关 键 词： | 微生物固化 砂土 化学处理方式 无侧限抗压强度试验 机制分析 |
| 收稿时间： | 2014-05-08 |
Study of effect of chemical treatment on strength of bio-cemented sand |
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| CUI Ming-juan,ZHENG Jun-jie,ZHANG Rong-jun,MIAO Chen-xi,ZHANG Jun-jie.Study of effect of chemical treatment on strength of bio-cemented sand[J].Rock and Soil Mechanics,2015,36(Z1):392-396. |
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| Authors: | CUI Ming-juan ZHENG Jun-jie ZHANG Rong-jun MIAO Chen-xi ZHANG Jun-jie |
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| Institution: | Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China |
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| Abstract: | A novel ground treatment technique, microbial-induced calcite precipitation(MICP), has recently emerged in geotechnical engineering, which utilizes the calcite precipitation to bind loose particles together; and therefore, the mechanical properties of sand can be enhanced. The objective of this study is to investigate the effect of chemical treatment on the strength of bio-cemented sand. Sporosarcina pasteurii is used to induce calcite precipitation, and all the specimens are prepared by injecting a single concentration or multiple different concentrations of chemical solutions. In this study, 0.5 and 1.0 mol urea-calcium chloride solutions are used for the former chemical treatment, while for the latter one, 0.5 mol urea-calcium chloride solution is firstly injected; and subsequently, 1.0 mol urea-calcium chloride solution is utilized. Based on the experiment, the strength, failure modes and calcite content are analyzed. From the experimental results, it can be found that chemical treatment has significant influence on the unconfined compressive strength of bio-cemented sand soil, but no pronounced effect can be seen in the failure modes and calcite content. Injecting multiple different concentrations of chemical solutions can be beneficial to obtain relative high compressive strength by using less treatment times. Finally, the mechanism analysis corresponding to the effect of chemical treatment on the strength of bio-cemented soil is further conducted. |
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| Keywords: | microbial-induced calcite precipitation(MICP) sand chemical treatment unconfined compressive strength test mechanism analysis |
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