【摘要】 为了解决煤层开采下行裂隙造成的生态脆弱矿区浅表生态恶化和水资源量下降等问题,通过微生物诱导碳酸钙(MICP)技术对下行裂隙试样进行修复加固;采用无侧限抗压强度试验和直接剪切试验测定不同浓度微生物菌液加固后试样物理力学性质的变化,进而揭示微生物矿化对下行裂隙的修复机理。结果表明:随着微生物菌液浓度升高,试样无侧限抗压强度和抗剪强度均逐级提升,菌液对裂隙土体的修复能力增强,可一定程度上改善土体的物理力学性质。更多还原

【Abstract】 In order to solve the problems of superficial ecological deterioration and decline of water resources in the ecologically fragile mining area caused by the downward cracks in seam mining, the unconfined compressive strength test and direct shear test were used to determine the changes of physico-mechanical properties of the reinforced sample with microbial solution of different concentrations, and reveal its mechanism. The results show that with the increase of the concentration of the microbial bacteria liquid, the unconfined compressive strength and shear strength of the sample are gradually increased, and the ability of the bacteria liquid to repair the fractured soil becomes enhanced, which can improve the physico-mechanical properties of the soil to a certain extent.更多还原