温度对微生物诱导碳酸钙沉积加固砂土的影响研究

彭劼; 冯清鹏; 孙益成

doi:10.11779/CJGE201806010

温度对微生物诱导碳酸钙沉积加固砂土的影响研究 English Version

彭劼^{1, 2},
冯清鹏^{1, 2},
孙益成^{1, 2}

1. 河海大学岩土力学与堤坝工程教育部重点试验室,江苏南京 210098;
2. 江苏省岩土工程技术工程研究中心,江苏南京 210098

基金项目: 国家自然科学基金项目（51578214）

详细信息

作者简介:
彭劼(1971- ),男,湖南衡阳人,教授,博士生导师,主要从事软基处理相关研究。E-mail: peng-jie@hhu.edu.cn。

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出版历程
- 收稿日期: 2017-03-22
- 发布日期: 2018-06-24

Influences of temperatures on MICP-treated soils

PENG Jie^{1, 2},
FENG Qing-peng^{1, 2},
SUN Yi-cheng^{1, 2}

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Jiangsu Research Center for Geotechnical Engineering Technology, Nanjing 210098, China

摘要

摘要: 利用尿素水解菌ATCC 11859,在10℃,20℃,30℃的环境下进行了微生物诱导碳酸钙沉积（MICP）水溶液试验、一维砂柱加固试验和细菌活性试验。研究表明,水溶液试验中,温度对于MICP的影响和反应时间有关,反应前期,温度较高的环境下钙离子消耗量较大,反应一段时间后温度较低的环境下钙离子消耗量较大;砂柱试验中,温度较低的环境下加固形成的砂样无侧限抗压强度较大,碳酸钙含量的检测表明,环境温度越高,砂柱中生成的碳酸钙含量越低;无侧限压缩试验的应力应变关系表明,相对低温条件下MICP处理的砂样在达到峰值强度时能够产生较大的变形;不同温度下细菌活性试验表明,细菌活性衰减较快是高温环境下碳酸钙的最终沉积量较小的原因。
- 微生物诱导碳酸钙沉积 /
- 温度 /
- 土体加固
Abstract: A series of aqueous tests, one-dimesion sand column trials and bacterial activity tests using the ureolytic bacteria ATCC11859 are conducted to investigate the influences of temperatures (10℃, 20℃ and 30℃) on the microbially induced carbonate precipitation (MICP). The results show that in the aqueous tests, the effect of temperatures on the MICP is related to the reaction time; at the early stage, the consumption of calcium ion is much more at the higher temperature environment; after a period of time of the reaction, the consumption of calcium ion is much more at the lower temperature. In the sand column trials, the unconfined compressive strength of the sand samples after consolidation at the lower temperature is greater than that at the higher one, and the results of the calcium carbonate content of the samples show that the content of calcium carbonate in the sand columns is much lower at the higher temperature than that at the lower one. The stress-strain relationship of the unconfined compression tests shows that the sand column treated by MICP in the lower temperature environment can produce a larger deformation when the peak strength is reached. The bacterial activity tests under different temperatures show that the rapid decline in bacterial activity is the reason why the final amount of calcium carbonate is lower at the higher temperature.
- microbially induced carbonate precipitation /
- temperature /
- soil improvement

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参考文献(34)

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