盐溶液环境下微生物固化技术加固钙质砂的试验研究
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TU411

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广东省自然科学基金(2017A030313293)、广东省教育厅特色创新类基金(2016KTSCX108)和广州市科技计划(201804010250)


Experimental Study on Strengthening Calcareous Sand with Microbial Solidification Technology in Salt Solution Environment
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    摘要:

    微生物诱导碳酸钙沉淀(MICP)技术已被广泛应用于土体加固,但在海水环境和盐化土环境下的应用较少且没有形成完整的系统。本文利用NaCl配置不同浓度的盐溶液,并采用尿素水解菌,在不同浓度的盐溶液环境下进行了MICP的细菌活性试验、水溶液试验和一维砂柱加固试验。结果表明,水溶液试验中,在NaCl存在的环境下碳酸钙的产率比无NaCl环境下显著降低,且NaCl溶液的浓度越高,碳酸钙的产率越低;砂柱试验中,加固后砂样的无侧限抗压强度随NaCl浓度的提高而降低,在低浓度环境下,无侧限抗压强度降低的幅度较大,当NaCl溶液达到一定浓度后,无侧限抗压强度降低的幅度较小;细菌活性试验表明,细菌活性随NaCl溶液浓度的提高而快速衰减是碳酸钙产率和砂柱的无侧限抗压强度快速降低的原因。研究结果表明,微生物胶结技术在加固海相土和盐化土等方面具有可行性,在工程应用中具有广阔的前景。

    Abstract:

    Microbial induced carbonate precipitation (MICP) technology has been widely applied in soil reinforcement, but there are few studies on the use of microorganisms to reinforce soil in seawater and salinized soil and no complete system has been formed. The bacterial activity test, aqueous solution test and one-dimensional sand column strengthening test of MICP were carried out by using ureolytic bacteria in different concentration of salt solution prepared by NaCl.The studies show that in the aqueous solution test, the productivity of calcium carbonate in the presence of NaCl is significantly lower than that in the absence of NaCl, and the higher the concentration of NaCl solution, the lower the productivity of calcium carbonate. In the sand column test, the unconfined compressive strength of the sample decreases with the increase of NaCl concentration. In the low concentration environment, the unconfined compressive strength decreases greatly. When the NaCl solution reaches a certain concentration, the unconfined compressive strength decreases slightly. The bacterial activity test shows that the rapid decay of bacterial activity with increasing NaCl concentration is the reason for the rapid decrease of calcium carbonate productivity and unconfined compressive strength of sand column.The results show that microbial cementation technology is feasible in strengthening marine soil and salinized soil, and has potential engineering practical value and broad application prospects.

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刘家明,童华炜,赵寄橦,等. 盐溶液环境下微生物固化技术加固钙质砂的试验研究[J]. 科学技术与工程, 2021, 21(12): 5046-5053.
Liu Jiaming, Tong Huawei, Zhao Jitong, et al. Experimental Study on Strengthening Calcareous Sand with Microbial Solidification Technology in Salt Solution Environment[J]. Science Technology and Engineering,2021,21(12):5046-5053.

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历史
  • 收稿日期:2020-07-15
  • 最后修改日期:2021-01-28
  • 录用日期:2020-12-16
  • 在线发布日期: 2021-05-17
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