湖南大学学报（自然科学版）2024，Vol.51Issue(3)：121-129,9.DOI:10.16339/j.cnki.hdxbzkb.2024034
胶结液浓度对微生物固化花岗岩残积土强度特性的影响规律
Effect of Cement Concentration on the Strength Characteristics of Biocemented Granite Residual Soil
摘要
Abstract
Based on the analysis of the physical properties of granite residual soil,microbial induced carbonate precipitation experiments are conducted on granite residual soil with different perfusion times in the designed laboratory test device,using a mixture cement of bacillus pasteurii with calcium chloride and urea colloidal solution under different concentration.Experiments are conducted on cemented specimens of different treatment conditions for the Unconfined Compression Strength(UCS)experiment,calcium carbonate precipitation experiment and disintegration experiment.In this paper,X-Ray Diffraction(XRD)and Scanning Electron Microscopy(SEM)are also used to analyze the microstructure besides.Based on the above experiments,the effect of cement concentration and perfusion times on the strength characteristics of cemented granite residual soil is investigated.The results show that the cementing effect of the specimens is best when the concentration of the cementing solution is 1.0 mol/L within the range of the experiment parameters and the perfusion times are the same.When the concentration of the cementing solution is the same,the more perfusion times,the better the cementing effect of the specimens.The disintegration of the cemented specimens is greatly reduced,and the disintegration coefficients are less than 30%.In addition,the calcite crystals produced by biocement appear as distinct clusters,which fill and cement between the soil agglomerates.This is distinct from the microbial cementing properties of sandy soils,but the cemented process and mechanism of both are similar.关键词
微生物固化/花岗岩残积土/无侧限抗压强度/崩解性/微观结构Key words
biocement/granite residual soil/unconfined compressive strength/disintegrative characteristics/microstructure分类
建筑与水利引用本文复制引用
张永杰,欧阳健,黄万东,刘涛,朱剑锋,陈剑华..胶结液浓度对微生物固化花岗岩残积土强度特性的影响规律[J].湖南大学学报（自然科学版）,2024,51(3):121-129,9.基金项目
国家自然科学基金资助项目(51878071,52178416),National Natural Science Foundation of China(51878071,52178416) （51878071,52178416）
湖南省教育厅重点项目(20A020),Research Foundation of Education Bureau of Hunan Province(20A020) （20A020）
湖南省自然科学基金资助项目(2022JJ30615),Natural Science Foundation of Hunan Province(2022JJ30615) （2022JJ30615）
优势特色重点学科创新性项目(18ZDXK08),Innovative Projects of Key Disciplines with Advantageous Features(18ZDXK08) （18ZDXK08）
湖南省研究生科研创新项目(CX20230840),Postgraduate Scientific Research Innovation Project of Hunan Province(CX20230840) （CX20230840）
