砂黄土砂粒量高、具有疏松多孔结构，其力学性质不同于典型粉质黄土和砂土。为研究钙源及固化方式对MICP（Microbially Induced Carbonate Precipitation）技术处理砂黄土固化效果的影响，通过浸泡法和灌注法两种方式，分别采用氯化钙、乙酸钙和乳酸钙三种钙源进行小尺寸试验，以固化后试样的碳酸钙含量、碳酸钙分布均匀性及无侧限抗压强度为评价指标进行对比分析。研究结果表明：乙酸钙为钙源时固化试样均匀性较好；处理早期乳酸钙为钙源时固化试样的碳酸钙含量及无侧限抗压强度较高，但随着处理时间增加，氯化钙为钙源固化试样的强度更高。相较于浸泡法，灌注法可有效改善乳酸钙渗流不畅的现象，对于乳酸钙为钙源时固化效果的提升优于氯化钙和乙酸钙。灌注法固化试样碳酸钙分布更均匀、强度更高。

Sandy loess has high sand content and loose porous structure, and its mechanical properties are different from typical silty loess and sand. In order to study the effect of calcium source and curing method on the curing effect of MICP ( Microbially Induced Carbonate Precipitation ) technology in the treatment of sandy loess, the small-scale test was carried out by soaking method and perfusion method with three calcium sources of calcium chloride, calcium acetate and calcium lactate, respectively. The calcium carbonate content, calcium carbonate distribution uniformity and unconfined compressive strength of the solidified samples were used as evaluation indexes for comparative analysis. The results show that the uniformity of solidified samples is better when calcium acetate is used as calcium source. The calcium carbonate content and unconfined compressive strength of the solidified samples were higher when calcium lactate was used as the calcium source in the early stage of treatment, but with the increase of treatment time, the strength of the solidified samples with calcium chloride as the calcium source was higher. Compared with the soaking method, the perfusion method can effectively improve the poor seepage of calcium lactate, and the curing effect is better than that of calcium chloride and calcium acetate when calcium lactate is used as the calcium source. The calcium carbonate distribution of the solidified sample by perfusion method is more uniform and the strength is higher.

内蒙古自然科学基金(2022LHMS05101);内蒙古自治区直属高校基本科研业务费项目(JY2022096,ZTY2023058,ZTY2023056)