摘要
为探究微生物改良砂土的动力变形特性,对不同相对密实度、不同微生物培养时间、不同灌注加固速率和浓度下的改良砂土进行了共振柱试验。得出如下结论:动剪切模量随砂土自身的相对密实度的提高而增大,随菌液培养时间的增加呈幂函数增长;菌液浓度和灌注速率应适中,菌液浓度过高或者灌注速率太慢,会在灌注口形成一层碳酸钙结晶屏障,阻碍砂土加固均匀性,灌注速率太快则会导致先前吸附在土颗粒的碳酸钙结晶被冲刷,影响加固改良效果;通过分析试验成果,在采用培养时间为10h、菌液浓度为6mM/L且以0.25ml/min的灌注速率的加固方案时,可以取得较好加固效果。
In order to investigate the dynamic deformation characteristics of microbial modified sand,the resonant column tests are carried out under the different relative density,different microbial culture time,different pouring rate and concentration.The test conclusions are as follows:the dynamic shear modulus increases with the increase of the relative density of the sand itself,and increases with the increase of the culture time of the bacterial solution as a power function;the concentration of the bacterial solution and the perfusion rate should be moderate,if the concentration of the bacterial solution is too high or the perfusion rate is too slow,it will form a layer of calcium carbonate crystal barrier at the perfusion port,and hinder the uniformity of the sand reinforcement.If the perfusion rate is too fast,it will lead to the previous adsorption of the calcium carbonate crystal to the soil particles be washed out,the effect of reinforcement and improvement is affected;through the test results,it is confirmed that the reinforcement effect can be better when the cultivation time is 10 h,the concentration of bacterial solution is 6 mM/L,and the grouting rate is 0.25 ml/min.
作者
罗建林
Luo Jianlin(Jiangxi Vocational College of Applied Technology,Ganzhou 341000,China)
出处
《工程勘察》
2020年第6期14-18,共5页
Geotechnical Investigation & Surveying
关键词
微生物诱导碳酸钙结晶
改良砂土
动力变形
剪切模量
阻尼比
microbial induced calcium carbonate crystallization
improved sand
dynamic deformation
shear modulus
damping ratio
作者简介
罗建林(1979-),男(汉族),江西万安人,硕士,高级工程师.
