铁基灌浆对粉土特性影响试验研究  

Laboratory Tests on the Improvement of Characteristics of Silt Using Iron Bacteria

作　　者：许朝阳[1,2] 马耀仁 吕惠[1] 周锋[1] 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009 [2]同济大学地下建筑工程系,上海200092

出　　处：《建筑科学》2014年第3期44-47,共4页Building Science

基　　金：国家自然科学基金资助项目(51278446)

摘　　要：自然界广泛存在铁细菌,从土壤中筛选分离出的目标铁基菌株可将二价铁氧化成羟基络合物,最终形成具有很大的反应活性和吸附性的生物黏泥。本文利用目标铁基菌株及其代谢产物对粉土进行灌浆,比较素土和铁基灌浆土渗透系数和无侧限抗压强度的变化,并从微观结构上探讨铁基灌浆改性粉土特性的机理。结果显示:利用生物作用析出的矿物晶体和代谢产物可充填颗粒间的晶格构造、胶结土体颗粒,改善粉土的工程特性。Iron bacteria exist widespreadly in nature, which can be screened from the soil to oxidize ferrous iron into hydroxyl complex and produce gelatinous slime with high reactivity and adsorbability, in this paper, the extraction of iron bacterial products is used to grouting of silt. The permeability and unconfined compressive strength of silt before and after grouting are compared. And the modification mechanism of silt by hio-grouting is investigated from the perspective of mesoscopic. The result shows that metabolic products and mineral precipitation of biological function can fill in the mineral of the lattice structure and glue the soil granule and improve the engineering characteristics of silt.

关 键 词：粉土 铁基细菌 渗透系数 无侧限抗压 微观结构 

分 类 号：TU443[建筑科学—岩土工程]