| 彭成,李佳宝,刘宵凌,莫彪,陈果,李超,欧阳以.微生物诱导碳酸钙沉淀提高红砂岩堆石料无侧限抗压强度的试验研究[J].南华大学学报(自然科学版),2023,(1):40~46.[PENG Cheng,LI Jiabao,LIU Xiaoling,MO Biao,CHEN Guo,LI Chao,OUYANG Yi.Experimental Study on Improving Unconfined Compressive Strength of Red Sandstone Rockfill by Microorganism Induced Calcium Carbonate Precipitation[J].Journal of University of South China(Science and Technology),2023,(1):40~46.] |
| 微生物诱导碳酸钙沉淀提高红砂岩堆石料无侧限抗压强度的试验研究 |
| Experimental Study on Improving Unconfined Compressive Strength of Red Sandstone Rockfill by Microorganism Induced Calcium Carbonate Precipitation |
| 投稿时间：2022-10-18 |
| DOI：10.19431/j.cnki. 1673-0062.2023.01.006 |
| 中文关键词: 红砂岩堆石料 无侧限抗压强度 微生物矿化 碳酸钙 |
| 英文关键词:red sandstone rockfill materials unconfined compressive strength microbial mineralization calcium carbonate |
| 基金项目:国家自然科学基金青年基金项目(51708273);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008);湖南省教育厅项目(20C1608) |
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| 中文摘要: |
| 为改善红砂岩堆石料的力学性能,采用巴氏芽孢杆菌诱导碳酸钙沉淀矿化技术加固红砂岩堆石料。对不同含石量的红砂岩堆石料进行无侧限抗压强度试验,并测定土体的抗压强度指标与碳酸钙产量来表征微生物改良堆石料效果,结合扫描电镜分析微生物改良堆石料的微观结构特征。结果表明:巴氏芽孢杆菌诱导碳酸钙沉淀改善红砂岩堆石料的抗压性能效果明显,经过恒温养护10 d矿化效率最高,土样由初期黏土的黏结作用转变为碳酸钙胶结作用,养护后期土样表现出更大的脆性特征;在一定含石量范围,微生物矿化产生的碳酸钙产量与含石量和养护时间呈正相关性,且抗压强度与碳酸钙产量呈正比关系,进一步表明碳酸钙胶结作用是试样抗压强度增大的主要因素;从SEM(scanning electron microscope)图像分析,高含石量堆石料为微生物提供更大生存繁衍和活动空间,微生物矿化生成碳酸钙晶体主要附着在土体骨架粗颗粒上和填充于颗粒间的孔隙,有效加强了土体颗粒间的胶结作用并增强了土体的力学性能。 |
| 英文摘要: |
| In order to improve the mechanical properties of red sandstone rockfill, Bacillus pasteurella induced calcium carbonate precipitation mineralization was used to reinforce the red sandstone rockfill. The unconfined compressive strength test was carried out on the red sandstone rockfill materials with different rock contents, and the compressive strength index of soil mass and calcium carbonate output were measured to characterize the effect of microbial improvement of rockfill materials, and the microstructure characteristics of microbial improvement of rockfill materials were analyzed with scanning electron microscope. The results showed that the compressive properties of red sandstone rockfill materials were significantly improved by Bacillus pasteureus induced calcium carbonate precipitation. After 10 days of constant temperature curing, the mineralization efficiency was the highest. The soil samples changed from the initial clay bonding to calcium carbonate cementation, and the soil samples showed greater brittleness in the later curing period; In a certain range of rock content, the output of calcium carbonate produced by microbial mineralization is positively related to the rock content and curing time, and the compressive strength is in direct proportion to the output of calcium carbonate, which further indicates that calcium carbonate cementation is the main factor to increase the compressive strength of the sample; From the SEM(Scanning Electron Microscope)image analysis, the rockfill material with high rock content provides more space for microorganisms to survive, multiply and move. The calcium carbonate crystals generated by microbial mineralization are mainly attached to the coarse particles of the soil skeleton and filled in the pores between particles, effectively strengthening the cementation between soil particles and strengthening the mechanical properties of the soil. |
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