大豆脲酶诱导碳酸钙固化黄河泥沙水稳定性试验研究  

Experimental study on water stability of Yellow River silt solidified by soybean-urease induced carbonate precipitation

作　　者：王钰轲 陈浩[1,2,3] 宋迎宾 王振海 钟燕辉 张蓓[1,2,3] WANG Yuke;CHEN Hao;SONG Yingbin;WANG Zhenhai;ZHONG Yanhui;ZHANG Bei(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Provincial and ministerial collaborative innovation center for underground engineering disaster prevention and control,Zhengzhou 450001,China;Yellow River Water Resources Commission,Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China;Rasearch Center on Levee Satefy&Disaster Prevention,Ministy of Water Resources,Zhengzhou 450003,China)

机构地区：[1]郑州大学水利与交通学院,河南郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [3]地下工程灾变防控省部共建协同创新中心,河南郑州450001 [4]黄河水利委员会黄河水利科学研究院,河南郑州450003 [5]水利部堤防安全与病害防治工程技术研究中心,河南郑州450003

出　　处：《水利学报》2024年第1期71-79,共9页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(U23A20672,52178369);中原科技创新领军人才(234200510014);河南省优秀青年基金项目(232300421069);河南省高校科技创新人才支持计划(24HASTIT014);河南省交通运输厅科技计划项目(2022-5-5)。

摘　　要：随着国家“交通强国”战略的提出,沿黄工程建设发展迅速,填筑用土需求剧增。黄河泥沙作为填筑材料的可行性已被证实,但其在多雨地区的服役性能需要改善,探索一种生态、高效的泥沙加固方法提高其水稳定性十分关键。本文基于酶诱导碳酸钙沉淀(EICP)技术固化黄河泥沙的方法,分别开展了常规浸水条件和干湿循环条件下固化黄河泥沙的水稳定性试验,研究了浸水后试样的质量损失及强度折损情况,分析了干湿循环对固化后黄河泥沙试样强度软化系数的影响规律。结果表明:采用EICP技术固化的黄河泥沙试样浸水崩解过程相比原状试样更加缓慢;胶结液浓度1.5 mol/L的黄河泥沙试样长期(56 d)浸水后,几乎保持完整,质量损失率仅为6.36%,强度折损率仅为6.21%;10次干湿循环后,不同胶结液浓度处理后的黄河泥沙试样均出现了不同程度的颗粒松散和脱落现象,胶结液浓度1.5 mol/L、灌浆10次的黄河泥沙试样的抗压强度损失仅为9.96%,抗干湿循环能力最强。利用EICP技术可以有效的固化黄河泥沙并提升其水稳定性,这对推进黄河泥沙的资源化利用进程十分重要。With the proposal of the national strategy of “transportation power” and the rapid development of engineering construction along the Yellow River,the demand for filling soil has increased dramatically.The feasibility of theYellow River silt as fill material has been confirmed,but its service performance in rainy areas needs to be improved.Exploring an ecological and efficient silt reinforcement method to improve its water stability is critical.Based on this,enzyme-induced calcium carbonate precipitation(EICP) curing of the Yellow River silt is proposed in this paper.Water stability tests on the cured Yellow River silt under conventional immersion conditions and dry-wet cycle conditions were carried out respectively.The mass loss and strength loss of the samples after immersion were studied.The effect law of dry-wet cycles on the softening index of cured Yellow River silt samples was analyzed.The results show that the disintegration process of the Yellow River silt sample solidified by EICP technology is slower than that of the original sample.The Yellow River silt samples with cement concentration C=1.5 mol/L remained almost intact after long-term(56 d) water immersion,with mass and strength loss rates of only 6.36% and 6.21%,respectively.After 10 dry-wet cycles,the Yellow River silt samples with different cement concentrations showed different degrees of particle loosening and shedding.The loss of compressive strength of the Yellow River silt sample with cement concentration C=1.5 mol/L and grouting times N=10 was only 9.96%,and the resistance to wet-dry cycles was the strongest.By using EICP technology,the Yellow River silt can be effectively solidified and its water stability can be improved,which is very important for promoting the process of resource utilization of the Yellow River silt.

关 键 词：黄河泥沙 EICP 干湿循环 质量损失 强度损失 软化系数 

分 类 号：TV43[水利工程—水工结构工程]