摘要
为研究菌胶比对微生物固化黏土效果的影响,选用巴氏生孢八叠球菌作为固化菌种,设置三组不同菌胶比的试验开展微生物固化黏土试验,通过直剪试验、无侧限抗压试验研究改性土体的力学性能,并在此基础上采用酸洗法测量固化土的碳酸钙生成量,与清水对照组对比分析微生物固化黏土的效果。试验结果表明:采用的方法可有效加固黏土,生物固化后试样的抗剪强度和无侧限抗压强度均明显优于清水对照组;菌胶比等于1的土体强度提升幅度最大,菌胶比等于2时次之,等于0.5时最低,力学强度随着菌胶比增加而呈现先增大后减小的趋势;碳酸钙生成量与土体强度之间呈现正相关关系,菌胶比会影响碳酸钙生成量进而影响黏土加固效果。说明菌胶比对微生物固化黏土效果影响较大,优化菌胶比对提升微生物固土强度具有重要作用。
In order to analyze the effects of bacterial-binder ratio on the curing effects of microorganisms,sporosarcina pasteurii is used.Three groups of experiment corresponding to different bacterial-binder ratios are conducted to rein-force clay.The mechanical strengths of clay are obtained by direct shear test and unconfined compressive test.Addi-tionally,the acid washing method is employed to obtain the production of calcium carbonate.The enhancement of the mechanical strength of reinforced clay is compared with that of their reference counterpart which uses clear water in-stead of MICP.The results show that the method can effectively reinforce clay,and the shear strength and unconfined compressive strength of the samples are obviously higher than that of their reference counterparts.The mechanical strength of clay with bacterial-binder ratio equal to 1 is the highest(with the unconfined compressive strength reached 192.49 kPa and the production of calcium carbonate reached 4.28%)among the three groups of experiments conduc-ted,followed by the ratio equal to 2.The large amount of calcium carbonate produced corresponds to high improvement of the mechanical strength of clay.The bacterial-binder ratio could affect the production of calcium carbonate and thus affect the mechanical strength of clay.These results demonstrate that the ratio has a significant impact on the effective-ness of reinforcing clay,indicating the importance of optimizing the ratio to improve the effectiveness of MICP.
作者
陈垚
王重卿
王浩
李流芳
赖国正
李熙
江世雄
王林
CHEN Yao;WANG Zhongqing;WANG Hao;LI Liufang;LAI Guozheng;LI Xi;JIANG Shixiong;WANG Lin(State Grid Fujian Electric Power Research Institute,Fuzhou,Fujian 350007,China;Zijin School of Geology and Mining,Fuzhou University,Fuzhou,Fujian 350116,China)
出处
《水利与建筑工程学报》
2024年第4期175-180,共6页
Journal of Water Resources and Architectural Engineering
基金
国网福建省电力有限公司项目“输电线路塔基裸土植被修复生境调控技术研究及生态基材研制”(SGFJDK00DYJS2310139)。
关键词
微生物固化
菌胶比
黏土
直剪试验
无侧限抗压强度
microbial solidification
bacterial-binder ratio
clay
direct shear test
unconfined compressive strength
