EICP技术固化黄泛区粉土抗压强度实验研究  

Experimental Study on Compressive Strength of EICP Technology Solidifying Silt in the Yellow River Flooding Area

作　　者：原华[1,2] 郑伟 原耀楠 冯佳星 YUAN Hua;ZHENG Wei;YUAN Yaonan;FENG Jiaxing(Henan University College of Civil Engineering and Architecture,Henan Kaifeng 475004,China;Henan University Institute of Geotechnical and Rail Transport Engineering,Henan University,Henan Kaifeng 475004,China;Henan JianyeLand Jiaozuo Co.,Ltd.,Henan Jiaozuo 454150,China;Beijing Zhongke Hongtai Consulting Group Co.,Ltd.,Beijing 1011oo,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]河南大学岩土与轨道交通工程研究所,河南开封475004 [3]河南建业置地焦作有限公司,河南焦作454150 [4]北京中科宏泰顾问集团有限公司,北京101100

出　　处：《河南大学学报（自然科学版）》2022年第6期727-733,共7页Journal of Henan University:Natural Science

基　　金：河南省重点研发与推广专项(科技攻关)项目(202102310247)。

摘　　要：为对脲酶诱导碳酸钙沉积(EICP)技术在黄泛区粉土固化中的应用提供理论指导和技术参数,论文对EICP固化黄泛区粉土的抗压强度进行实验研究.首先研究温度、pH值、氯化钙与尿素浓度比对Ca2+矿化率的影响;然后拌合制备土样,分析了养护条件、反应液掺量、脲酶掺入比、胶结液浓度和龄期,对固化土体无侧限抗压强度的影响;并结合SEM进行微观分析.结果表明:胶结液为中性或弱碱性时矿化率较高,从脲酶利用率和经济性的角度,氯化钙与尿素最佳浓度比宜为1∶1.5;一定范围内提高养护温度和湿度可促进固化土体强度的提升;为达到较高的土体强度,脲酶与胶结液体积比宜为2∶3.In order to provide theoretical guidance and technical parameters for the application of enzyme induced carbonate precipitation(EICP) in silt solidification in the Yellow River flooding area, the compressive strength of EICP in the solidification of silt in the Yellow River flooding area were studied in this paper. Firstly, the effect of temperature, pH and the concentration ratio of calcium chloride to urea in cementing solution on Ca2+mineralization ratio was studied. Then, the soil samples were prepared by mixing, and the effects of curing conditions, reaction solution and urease dosage, cementing solution concentration as well as curing age on the unconfined compressive strength of solidified soil were analyzed;and the microscopic analysis was carried out combined with SEM. The results show that the mineralization rate is higher when the cementing solution is neutral or weakly alkaline, and from the perspective of urease utilization and economy, the optimum concentration ratio of calcium chloride to urea is 1∶1.5;increasing curing temperature and humidity within a certain range can improve the strength of solidified soil;in order to achieve higher soil strength, the volume ratio of urease to cementing solution should be 2∶3.

关 键 词：脲酶诱导碳酸钙沉积 粉土 矿化率 无侧限抗压强度 微观分析 

分 类 号：TU411[建筑科学—岩土工程]