微生物改良膨胀土的试验研究  

Experimental study on improvement of expansive soil with microbe

作　　者：杜静[1] 周东[2] 

机构地区：[1]广西交通职业技术学院,广西南宁530023 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《水利水电技术》2012年第7期103-105,87,共4页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金资助项目(40772190);广西理工科学实验中心重点项目(LGZX201103);广西自然科学基金(0339006)

摘　　要：利用微生物对南宁—百色地区膨胀土进行改性试验研究,通过添加不同菌株的自由膨胀率试验,筛选出对膨胀土胀缩性影响较大的菌株。将筛选出的菌株添加至膨胀土中,对土体进行直剪试验、膨胀性试验、收缩试验等。试验结果表明,改性土抗剪强度增大,膨胀性指标降低,线缩率减小,膨胀土经改性为弱膨胀土。An experimental study is made on the improvement of the expansive soil within Nanning-Baise region with microbe; i.e. the microbial strains with larger impacts on the swell-shrink characteristics are selected through the free swell ratio test with adding different microbial strains, and then the selected microbial strains are put into the expensive soil, thereafter, the tests such as direct shear test, expensive test, shrinkage test, etc. are made on the soil. The test result shows that the shear strength of the improved soil is increased along with the decrease of the sweUing index and linear shrinkage ratio, therefore, the expansive soil becomes a kind of weak expansive one after the improvement.

关 键 词：微生物 膨胀土 试验研究 胀缩性 土壤改良 

分 类 号：TU411[建筑科学—岩土工程]