| 土体适用MICP技术的渗透特性条件研究 |
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| 引用本文： | 李贤,汪时机,何丙辉,沈泰宇.土体适用MICP技术的渗透特性条件研究[J].岩土力学,2019,40(8):2956-2964. |
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| 作者姓名： | 李贤 汪时机 何丙辉 沈泰宇 |
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| 作者单位： | 1. 西南大学 资源与环境学院，重庆 400715；2. 西南大学 工程技术学院，重庆 400715 |
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| 基金项目： | 国家自然科学基金（No. 11572262, No. 41771312）；重庆市留学人员回国创业创新支持计划项目（No. CX2018103）。 |
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| 摘 要： | 影响土体适用微生物诱导碳酸钙沉淀（MICP）技术的主要因素有颗粒的有效粒径、孔隙直径、颗粒级配以及水动力学参数等，实际工程土中复杂的孔隙结构难以通过单一的参数来衡定，而土体的渗透性能够综合反映诸多因素。针对分步、低速工艺下的定容量饱和渗透灌浆，提出了在满足土壤颗粒粒径和微生物尺寸相容性的前提下，以渗透系数表征的土体适用MICP技术的条件判断公式；并通过涵盖砂土、粉土、砂质黏性紫色土、膨胀土等9种土（控制粒径 0.040～0.913 mm，初始孔隙率 31.5%～54.9%）的固化试验、渗透试验和强度试验进行了验证。结果表明：结合渗透性折减参数 值的选取（无黏性土 ，黏性土 ），渗透条件Ⅲ可适用于多种土体；渗透条件Ⅰ适用于MICP技术广为应用的砂土。同时得出了灌浆浆液总量和灌浆总时长的计算公式，为MICP固土技术可行性评估和进一步推广应用提供参考。
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| 关 键 词： | 渗透系数 MICP 适用性 土体基质 固化参数 |
| 收稿时间： | 2018-09-14 |
Permeability condition of soil suitable for MICP method |
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| LI Xian,WANG Shi-ji,HE Bing-hui,SHEN Tai-yu.Permeability condition of soil suitable for MICP method[J].Rock and Soil Mechanics,2019,40(8):2956-2964. |
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| Authors: | LI Xian WANG Shi-ji HE Bing-hui SHEN Tai-yu |
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| Institution: | 1. College of Resource and Environment, Southwest University, Chongqing 400715, China,
2. College of Engineering and Technology, Southwest University, Chongqing 400715, China) |
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| Abstract: | The application of microbial-induced calcite precipitation (MICP) technology in the soil is mainly affected by the factors: the effective particle size, pore diameter, particle gradation, and hydrodynamic parameters of the particles. The complex pore structure of the soil is difficult to be determined by a single parameter in practical engineering, whereas most of them can be reflected comprehensively by the permeability of the soil. The conditional judgment formulas are proposed for the saturated osmotic grouting with the constant capacity, the step-by-step and low-speed process in this paper. Moreover, with the premise of the size compatibility between the microorganism and the soil particle, the formulas are suitable for MICP method in the soil characterised by the permeability coefficient. Furthermore, the formulas are verified by conducting solidification test, permeability test and strength test on nine types of soil (control particle size 0.040-0.913 mm, initial porosity 31.5%-54.9%) including sand, silt, sandy-clayey purple soil and expansive soil. In the condition of the appropriate value of the permeability reduction parameter ( for cohesionless soil, for cohesive soil), it is showed that the third permeability condition can be applied to all types soil in the tests. In addition, the first permeability condition is more suitable for sandy soil than others in MICP technology. Meanwhile, the formulas of the total volume of grouting solution and the total grouting time are obtained, which provide references for the feasibility assessment of the MICP method and further promotion of this technology. |
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| Keywords: | permeability coefficient MICP applicability soil matrix solidification parameters |
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