摘要
膨胀土是岩土工程界的公认难题之一,基于微生物技术,结合石灰、水泥、粉煤灰等改良材料,系统开展了复合改良膨胀土的工程特性试验研究。结果表明:①微生物复合改良膨胀土成功的将弱膨胀土变为无膨胀土,自由膨胀率最低降低至8%,降幅达84.31%,工程效果良好。②经复合处理试样中的蒙脱石相对含量降低、伊利石相对含量上升是抑制胀缩特性的一个重要原因。③膨胀土中单掺菌液20%情况下,摩擦角同比可增加23%。④菌液、粉煤灰、石灰复合改良膨胀土情况下,石灰掺比1%粉煤灰2%的低掺比组合对提高强度更为有利。
The expansive soil is one of the recognized challenges in the field of geotechnical engineering.Based on the microbial technology,combined with the improved materials such as lime,cement and fly ash,the experimental researches on the engineering characteristics of composite improved expansive soil are conducted.The results show that:(1)The weak expansive soil is successfully changed into the non-expansive one by the microbial composite improvement of expansive soil,and the free expansion rate is reduced to 8%at the lowest,with a decrease of 84.31%.The engineering effect is good.(2)The decrease of the relative content of montmorillonite and the increase of the relative content of illite in the composite treated samples are the important reason for inhibiting the expansion and contraction characteristics.(3)When the bacterial solution of 20%is added to the expansive soil,the friction angle can increase by 23%compared to that at the same time last year.(4)In the case of composite improvement of expansive soil with bacterial solution,fly ash and lime,a low ratio combination of lime of 1%and fly ash of 2%is more advantageous for improving the strength.
作者
肖建章
刘禹杉
王迪
李健
吴帅峰
王波
XIAO Jianzhang;LIU Yushan;WANG Di;LI Jian;WU Suaifeng;WANG Bo(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Hai Lasu Water Conservancy Engineering Management and Protection Center of Weng Niute,Chifeng 024500,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第S01期97-101,共5页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划课题(2019YFC1509800)
引江济淮公司科研项目(YJJH-ZT-ZX-20221130515)
关键词
膨胀土
微生物
复合改良
胀缩特性
expansive soil
microorganism
compsite improvement
engineering characteristic
作者简介
肖建章(1977—),男,博士,主要从事岩土工程材料力学性质方面的试验研究工作。E-mail:xiaojz@iwhr.com。
