摘要
戚城遗址本体土质为粉质黏土,存在结构松散、强度低、毛细作用强烈及水稳定性差等不利特性,如何改善修复遗址土的性能令人关注。选用糯米浆、石英砂、氧化铝、氟化钙作为外加材料,对戚城遗址粉质黏土进行改良,制备仿遗址土。研究0%、1%、3%、5%、7%、9%糯米浆浓度下仿遗址土的力学性能、显微结构及色差变化。结果表明:随着糯米浆浓度的增加,土样的强度和内摩擦角先增大后减小,黏聚力呈线性递增趋势;3%浓度糯米浆改良仿遗址土的抗剪强度、无侧限抗压强度及内摩擦角最大,显微结构密实;对试样进行色差分析,仿遗址土、3%浓度糯米浆仿遗址土与遗址土间的色差均较小。采用糯米浆对MICP技术进行改良,发现糯米浆可以提高细菌活性,促进碳酸钙生成,随着养护天数的增加,改良MICP土体强度持续提高,生物矿化时间长。
The ruins soil of Qicheng is silty clay,typically linked with unfavorable characteristics such as loose structure,low strength,strong capillary action and poor hydraulic property.How to improve the performance of the soil in the restoration site is of great concern.In this study,glutinous rice slurry,quartz sand,alumina and calcium fluoride were added to the silty clay in Qicheng site for improvement.The imitation ruins soil was prepared by this method.The mechanical properties,microstructure and color difference of the imitation ruins soil modified with different glutinous rice slurry contents(of 0%,1%,3%,5%,7%,and 9%concentrations)were studied.The results show that with the increase of the glutinous rice slurry concentration,the strength and internal friction angle of soil samples increase first and then decrease,and the cohesion shows a linear increasing trend;Imitation ruins soil improved by 3%concentration of glutinous rice slurry had the largest shear strength,unconfined compressive strength and internal friction angle,and its microstructure is dense;The color difference analysis of the soil sample shows that the color difference between the imitation ruins soil,imitation ruins soil improved by 3%concentration of glutinous rice slurry and the ruins soil are all small;Furthermore,using glutinous rice slurry to improve the MICP technique,it is found that glutinous rice slurry can increase the activity of bacteria and promote the production of calcium carbonate.With increasing of maintenance days,the strength of modified MICP soil has an increasing tendency,and the biological mineralization time is longer.
作者
岳建伟
陈颖
赵丽敏
张宝玺
孔庆梅
顾丽华
卢会芳
YUE Jianwei;CHEN Ying;ZHAO Limin;ZHANG Baoxi;KONG Qingmei;GU Lihua;LU Huifang(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,Henan,P.R.China;Key Laboratory for Safety Evaluation and Restoration of Immovable Cultural Relics in Kaifeng City,Henan University,Kaifeng 475004,Henan,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2022年第2期195-204,共10页
Journal of Civil and Environmental Engineering
基金
河南省科技攻关项目(212102310287、212102310271)。
关键词
仿遗址土
粉质黏土
糯米浆
戚城遗址
生物矿化
imitationruins
silty clay
glutinous rice slurry
Qicheng site
biomineralization
