微生物胶结在防治堤坝破坏中的应用研究

发布时间：2018-11-29 08:18

【摘要】：为防治漫顶引起侵蚀造成堤坝破坏,将微生物诱导碳酸钙沉淀即MICP技术应用于加固堤坝表层。通过向堤坝表层喷洒微生物细胞以及营养盐,最终在砂土孔隙中快速析出碳酸钙胶凝结晶,以改善堤坝表层砂的力学性能。首先,采用喷洒法处理堤坝表层;其次,对处理好的堤坝模型进行水槽试验,研究其抗侵蚀性;最后,对堤坝表层的试样进行强度与渗透试验。试验结果表明,采用MICP技术加固堤坝模型表层可有效提高其抗侵蚀力,防治由漫顶引起的堤坝破坏。对加固后的表层取样进行测试,结果表明:无侧限抗压强度可高达9MPa,渗透系数从4×10~(-4)m/s降低至7.2×10~(-7)m/s。试验说明,微生物胶结技术在加固堤坝表层方面具有潜在的工程实用价值和广阔的应用前景。
[Abstract]:In order to prevent erosion caused by overtopping, microorganism induced calcium carbonate precipitation (MICP) was applied to reinforce the surface layer of dike. By spraying microbial cells and nutrients on the surface of embankment, calcium carbonate cementitious crystallization was rapidly precipitated in the pores of sandy soil, so as to improve the mechanical properties of the sand in the surface layer of embankment. Firstly, the surface layer of embankment is treated by spraying method; secondly, the treated model is tested by flume to study its corrosion resistance; finally, the strength and permeability of the surface sample of embankment are tested. The experimental results show that strengthening the surface layer of the dike model with MICP technique can effectively improve the erosion resistance and prevent the dam damage caused by overtopping. The results show that the unconfined compressive strength can reach 9MPa and the permeability coefficient decreases from 4 脳 10 ~ (-4) m / s to 7.2 脳 10 ~ (-7) m / s. The experimental results show that microbial cementing technology has potential engineering practical value and broad application prospect in strengthening the surface layer of dike.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;重庆大学土木工程学院;
【基金】：国家自然科学基金(No.51578096) 高等学校学科创新引智计划资助(No.B13024) 江苏省普通高校研究生科研创新计划项目(No.KYZZ16_0269) 长江学者和创新团队发展计划资助(No.IRT1125) 中央高校科研业务费重点培育项目(No.2014B04914)~~
【分类号】：TV698.2

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