| 赵卫全,张银峰,李娜,耿会岭,严俊.微生物改良膨胀土的胀缩性及耐水性试验研究[J].中国水利水电科学研究院学报,2023,21(4):350-359 |
| 微生物改良膨胀土的胀缩性及耐水性试验研究 |
| Experimental study on swelling-shrinkage and water resistance of microbial modified expansive soil |
| 投稿时间：2023-03-09 |
| DOI：10.13244/j.cnki.jiwhr.20230041 |
| 中文关键词: 微生物诱导碳酸钙沉淀 膨胀土改良 胀缩性 耐水性 养护时间 |
| 英文关键词:microbial-induced calcite precipitation expansive soil improvement swelling-shrinkage water resistance curing time |
| 基金项目:国家重点研发计划课题（2019YFC1509800）；引江济淮公司科研项目（YJJH-ZT-ZX-20221130515）；中国水科院科研专项（EM0145B182020，EM0145B022021） |
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| 中文摘要: |
| 为了探索微生物诱导碳酸钙沉淀技术对膨胀土的改良效果，开展了微生物改良膨胀土的胀缩试验、崩解试验和冲刷试验，分析了微生物固化对膨胀土的自由膨胀率、无荷载膨胀率、有荷载膨胀率、收缩率、收缩系数、缩限和耐水性的影响。研究结果表明，随着微生物诱导生成的碳酸钙含量的增加，膨胀土的膨胀率、收缩率、崩解量、冲刷量均有明显降低；总体上，养护前7 d各项指标降低迅速，养护15 d之后变化较小。 |
| 英文摘要: |
| The swelling-shrinkage test, disintegration test and scour test of microbially modified expansive soil were carried out to explore the modification effect of microbial-induced calcite precipitation (MICP) on expansive soil.The effects of MICP on the free swell ratio, no loading swelling ratio, loading swelling ratio, shrinkage ratio, coefficient of shrinkage, shrinkage limit and the water resistance were analyzed.The results show that with the increase of precipitated calcium carbonate, the swell ratio, shrinkage ratio shrinkage rate, disintegration and flushing amount are significantly reduced.The indexes decrease rapidly in the first 7 days and the change is small after 15 days. |
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