工程地质学报2025，Vol.33Issue(3)：908-918,11.DOI:10.13544/j.cnki.jeg.2023-0070
钙源和Ca2+浓度对EICP固化钙质砂效果影响的试验研究
EXPERIMENTAL STUDY ON THE EFFECT OF CALCIUM SOURCES AND CA2+CONCENTRATION ON EICP CURED CALCAREOUS SAND
摘要
Abstract
Enzyme-induced calcium carbonate precipitation(EICP)is an environmentally friendly and efficient soil consolidation technique,and the type of calcium source may affect its consolidation effect.In order to quantify the effect of calcium source on EICP-cured calcareous sands,experiments on sand column curing with different calcium sources(calcium chloride,calcium acetate,calcium lactate,calcium nitrate)and different Ca2+concentrations(0.25 M,0.5 M,0.75 M,1 M)and aqueous solution experiments were carried out in this paper.The effects of EICP curing of calcareous sands were explored and analysed from macroscopic and microscopic perspectives through unconfined compressive tests,permeability tests,calcium carbonate production measurements,SEM test analyses.The results showed that the strength of specimens cured with calcium chloride as the calcium source is higher at higher calcium ion concentrations(Ca2+=1 M)and calcium nitrate as the calcium source at lower calcium ion con-centrations(Ca2+≤0.75 M).In terms of reducing the permeability of the specimen:calcium acetate＞calcium chlo-ride＞calcium nitrate＞calcium lactate,with the most significant decrease in permeability of specimens cured with calcium acetate as the calcium source.The crystal types and microscopic morphology of the precipitation products differ between calcium sources.Calcium chloride and calcium acetate as calcium sources formed rhombic-shaped calcium carbonate crystals.The calcium carbonate crystals formed by calcium lactate as the calcium source were tri-angular in shape and smaller in size.Calcium acetate as calcium source produces calcium carbonate crystals with ir-regular spherical shape formed by wrapping several small spheres.关键词
酶诱导碳酸钙沉淀技术(EICP)/钙质砂/钙源/无侧限抗压强度/渗透性/微观机理Key words
Enzyme-induced calcium carbonate deposition(EICP)/Calcareous sand/Calcium sources/Uncon-fined compressive strength/Permeability/Microscopic mechanism分类
交通工程引用本文复制引用
姜启武,黄明,崔明娟,宋卿,许凯,李爽..钙源和Ca2+浓度对EICP固化钙质砂效果影响的试验研究[J].工程地质学报,2025,33(3):908-918,11.基金项目
国家自然科学基金项目(资助号:41972276,52108307),福建省自然科学基金项目(资助号:2020J06013),福建省"雏鹰计划"青年拔尖人才项目(资助号:00387088),福州大学"旗山学者"项目(资助号:XRC-22015).This research is supported by the National Natural Science Foundation of China(Grant Nos.41972276,52108307),Natural Science Foundation of Fujian Province(Grant No.2020J06013),"Foal Eagle Program"Youth Top-notch Talent Project of Fujian Province,China(Grant No.00387088)and Qishan Scholar Project of Fuzhou University(Grant No.XRC-22015). （资助号:41972276,52108307）
