土木与环境工程学报（中英文）2024，Vol.46Issue(5)：109-116,8.DOI:10.11835/j.issn.2096-6717.2023.130
EICP改良膨胀土的物理力学性质试验研究
Experimental study on physical and mechanical properties of expansive soil improved by EICP
摘要
Abstract
In order to explore the physical and mechanical properties of weak expansive soil improved by urease Enzyme-Induced Calcium Carbonate Precipitation(EICP)technique,the expansion characteristics and mechanical properties of weak expansive soil treated by EICP were tested by soybean urease.The effects of urease concentration,initial Ca2+concentration,enzyme-binder ratio,urine-calcium ratio and curing time on the formation rate of calcium carbonate and free expansion rate were studied by orthogonal test of EICP multi-factor ratio,and the optimum ratio of EICP reaction solution was determined.On this basis,the expansive soil was improved by different dosages of EICP reaction liquid,and the effect was tested by free expansion rate test,unconfined compressive strength test and triaxial compression test.The results show that when the content of EICP reaction solution is 20%,the inhibiting is the best,and the mechanical strength and calcium carbonate formation rate of soil are the highest.The precipitate induced by soybean urease is calcite calcium carbonate,which is attached to the surface of soil particles.It not only fills the pores of soil particles,but also cements the skeleton particles of soil,hinders the contact between soil and water,improves the compactness and bonding strength of soil,and finally improves the expansibility and mechanical properties of expansive soil.关键词
酶诱导碳酸钙沉淀/膨胀土/膨胀特性/力学特性/微观机理Key words
enzyme-induced calcium carbonate precipitation/expansive soil/expansion characteristics/mechanical properties/microscopic mechanism分类
土木建筑引用本文复制引用
王欢,张佳伟,郭合家..EICP改良膨胀土的物理力学性质试验研究[J].土木与环境工程学报（中英文）,2024,46(5):109-116,8.基金项目
河南省高等学校重点科研项目(18A580002) （18A580002）
开封市科技发展计划项目(1801004) Key Scientific Research Project of Higher Education Institutions of Henan Province(No.18A580002) （1801004）
Science and Technology Development Program of Kaifeng(No.1801004) （No.1801004）
