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为了研究耐盐芽孢杆菌对砂土黏结强度加固作用的影响效果,本文对耐盐芽孢杆菌液与无活性的耐盐芽孢杆菌液分别处理过的砂样进行固化效果对比,以及对养护了7d、14d、21d的固化砂样进行自由落体试验,收集其主要碎块胶结体进行对比,最后再对养护了7d、14d、21d和28d的固化砂样进行直剪试验。对比试验结果表明经耐盐芽孢杆菌处理过的砂土的固化效果显著;自由落体试验收集的主要碎块胶结体,发现随着养护时间的增长,胶结体体积也开始增大,表明经耐盐芽孢杆菌处理的松散砂土胶结效果显著;固化砂样的直剪试验结果表明,经耐盐芽孢杆菌处理的砂样最大剪切力在前14d有显著的增加,14d到28d的增加变得缓慢。
In order to study the effect of Bacillus halodunt on the reinforcement effect of sand bond strength, this paper compared the curing effect of sand-treated Bacillus subtilis solution with inactive Bacillus halodurans solution, 14d, 21d free-fall solidified sand samples were collected to collect the main pieces of cement for comparison, and finally cured for 7d, 14d, 21d and 28d cured sand specimens for direct shear test. The comparative test results showed that the solidification effect of the sand treated with B. halodurans was remarkable. The main agglomerates collected from the free-fall test found that the volume of the cement began to increase with the increase of curing time, The results of direct shear tests on solidified sand samples showed that the maximum shear force of sand samples treated with Bacillus halodurans increased significantly in the first 14 days and increased slowly from 14 days to 28 days .