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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。
In order to prevent and treat the damage caused by erosion caused by dykes, microbial-induced calcium carbonate precipitation (MICP) technology is applied to reinforce the surface of dykes. By spraying microbial cells and nutrients to the surface of dykes, calcium carbonate gel crystals are finally precipitated in the sand pores to improve the mechanical properties of the surface sand of the dam. First of all, the surface of embankment is treated by spraying method. Secondly, the embankment model of well treated embankment is tested for its erosion resistance. Finally, the strength and infiltration test of embankment surface is carried out. The test results show that using MICP technology to reinforce the surface of the dam model can effectively improve the erosion resistance and prevent the dam damage caused by the overhang. The results of the tests show that the unconfined compressive strength can reach as high as 9 MPa and the permeability coefficient decreases from 4 × 10 -4 m / s to 7.2 × 10 -7 m / s. The experiment shows that microbial cementing technology has potential engineering practical value and broad application prospect in strengthening the surface of embankment.