摘要
豫东北濮阳地区地处黄河中下游,该地区土质多为黄河泛滥冲积而成的粉性土,水稳定性差,毛细水作用大,干燥时强度高,但潮湿时强度显著下降,提高土体强度迫在眉睫;MICP技术是近年来兴起的一项多学科交叉下新的研究领域,即微生物岩土工程.本文以MICP技术为依据,采用糯米浆对MICP技术进行改良,基于MICP技术、改良MICP技术下研究土体强度与养护天数的关系;通过直接剪切试验、无侧限抗压强度试验确定养护7、14、28 d素土、MICP加固土、改良MICP加固土3种试样的力学性能,测得主要力学指标有黏聚力、内摩擦角、无侧限抗压强度,得出改良MICP加固土的力学指标最大,MICP加固土次之,素土最低.研究表明:MICP技术可以提高土体的黏聚力,但对内摩擦角的提高作用并不明显;改良MICP技术既可以提高土体的黏聚力,又可以提高内摩擦角,使得土体力学性能得到加固.
Puyang area in the northeast of Henan Province is located in the middle and lower reaches of the Yellow River.The soil in this area is mostly silty soil formed by the flood of the Yellow River.The water stability is poor,the capillary water effect is great,and the strength is high when it is dry,but the strength decreases significantly when it is wet.MICP technology is a new research field under the interdisciplinary cross in recent years,namely microbial geotechnical engineering.In this paper,based on MICP technology,glutinous rice slurry is used to improve MICP technology.Based on MICP technology and modified MICP technology,the relationship between soil strength and curing days is studied.Through direct shear test and unconfined compressive strength test,the mechanical properties of plain soil after curing for 7 d,14 d and 28 d,MICP reinforced soil and modified MICP reinforced soil are determined.The main mechanical indexes are cohesion,internal friction angle and unconfined compressive strength.The mechanical index of modified MICP reinforced soil is the largest,followed by MICP reinforced soil and plain soil is the lowest.The results show that:MICP technology can improve the cohesion of soil,but the improvement of internal friction angle is not obvious;the improved MICP technology can not only improve the cohesion of soil,but also increase the internal friction angle,so that the mechanical properties of soil can be reinforced.
作者
岳建伟
张宝玺
赵丽敏
孔庆梅
王思远
YUE Jianwei;ZHANG Baoxi;ZHAO Limin;KONG Qingmei;WANG Siyuan(School of Civil Engineering and Architecture,Henan University,Henan Kaifeng475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2020年第6期707-716,共10页
Journal of Henan University:Natural Science
基金
国家自然科学基金面上项目(51978634)
河南省科技厅基础与前沿研究项目(162300410012)
关键词
粉性土
改良MICP技术
养护天数
力学性能
力学指标
加固
silty soil
improved MICP technology
maintenance days
mechanical properties
mechanical index
reinforce
作者简介
岳建伟(1971-),男,河南驻马店人,教授,博士.研究方向:遗址修复及遗址土性能研究;通信作者:赵丽敏,E-mail:mumu55882005@163.com
