Influences of temperatures on MICP-treated soils
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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。
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关键词:
- 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. -
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