【摘要】 通过对阿尔寨石窟红砂岩风化土进行微生物诱导矿化试验研究,使红砂岩风化土取得良好的矿化效果,为基于微生物诱导生成矿化术（microbial induced calcite precipitation,以下简称MICP）阿尔寨石窟壁面的绿色修复提供试验依据.在实验室矿化土体过程中,使用传统的巴氏芽孢杆菌和自源的大洋芽孢杆菌作为矿化菌株,通过设置不同梯度的菌液浓度值,测量矿化试件的强度和碳酸钙含量,找出试件强度与菌液浓度的关系,同时得到碳酸钙含量与菌液浓度以及强度的关系,确定两种菌液对红砂岩风化土矿化过程中的最佳OD₆₀₀值.试验结果表明,当巴氏芽孢杆菌菌液浓度OD₆₀₀为0.9,红砂岩风化土矿化试件的强度为896Kpa,孢杆菌菌液浓度OD₆₀₀为1.2时,红砂岩风化土矿化试件的强度为834Kpa.更多还原

【Abstract】 To provide a testing basis for green restoration of the Aerzhai Grottoes by the MICP technology, microbial induced mineralization of weathered red sandstone soil was investigated in this paper.In the process of mineralizing the soil in the laboratory, traditional Bacillus pasteurianus and self-sourced Bacillus oceanicus were used as the mineralizing strains, and the strength and calcium carbonate content of mineralized specimens were measured by setting different gradients of bacterial liquid concentration values to find out the relationship between the strength of the test specimen and the concentration of the bacterial solution and the relationships between the calcium carbonate content, the concentration and strength of the bacterial solution, so as to determine the best OD600 value of the two bacterial solutions in the process of mineralization of the weathered red sandstone soil.The test results show that when the concentration of Bacillus pasteurianum is 0.9,the strength of the mineralization specimen of the weathered red sandstone soil is 896 Kpa; and when the concentration of the bacillus bacteria is 1.2,the strength of the mineralization specimen of the weathered red sandstone soil is 834 Kpa.更多还原