基于NBPT调控的MICP一相注浆体系优化及其抗渗-力学协同增效机理研究  

Optimization of NBPT-regulated One-phase MICP Grouting System and Comparative Analysis on Its Anti-permeability-mechanical Performance

作　　者：徐望清 赖汉江 张智超 施伟韬 张耀星 郭川伟 麻岩 XU Wangqing;LAI Hanjiang;ZHANG Zhichao;SHI Weitao;ZHANG Yaoxing;GUO Chuanwei;MA Yan(Hubei University of Arts and Sciences,Xiangyang,Hubei 441053,China;Fuzhou University,Fuzhou,Fujian 350108,China;Fujian Institute of Address Engineering Survey,Fuzhou,Fujian 350003,China;Quanzhou Huatai Construction Engineering Co.,Ltd.,Quanzhou,Fujian 354299,China;China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China;Fujian Sanming Yihong Construction Engineering Co.,Ltd.,Sanming,Fujian 365099,China)

机构地区：[1]湖北文理学院,湖北襄阳441053 [2]福州大学,福建福州350108 [3]福建省地址工程勘察院,福建福州350003 [4]泉州市华泰建设工程有限公司,福建泉州354299 [5]中铁十八局集团有限公司,天津300222 [6]福建省三明市翼宏建设工程有限公司,福建三明365099

出　　处：《水利与建筑工程学报》2025年第2期19-24,105,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(42407271)。

摘　　要：针对传统两相注浆工艺中菌液迁移不可控、胶结液渗透不均等问题,提出一种基于脲酶抑制剂N-丁基硫代磷酰三胺(NBPT)调控的一相注浆体系,并通过反应动力学优化,实现抗渗与力学性能的协同提升。NBPT浓度通过正交试验进行优化,并结合变水头渗透试验、无侧限抗压强度测试及胶结物分布分析,系统对比传统两相与一相注浆性能差异。结果表明:当NBPT浓度为0.15 mmol/L时,尿素分解被延缓24 h以上,胶结液有效扩散半径达1.5 m~1.8 m,渗透系数被降低至5.1×10^(-7) cm/s,抗压强度被提升至1.92 MPa,胶结物分布均匀性指数达0.86。单次注浆即可完成施工,效率显著提升,且NBPT半衰期为14 d,90 d后土壤残留浓度在0.1 mg/kg以下,结合生物炭吸附工艺可进一步降低生态风险。通过时空匹配的时滞反应机制,传统工艺中局部堵塞与性能失衡问题可实现有效规避,为堤防修复、地基加固等工程提供了一种高效、低碳的解决方案。Microbially induced calcium carbonate precipitation(MICP)technology has been widely recognized for its environmental compatibility in soil reinforcement applications.However,the engineering application of traditional two-phase grouting processes has been hindered by challenges including uncontrollable bacterial fluid migration and nonuniform cementation fluid penetration.To address these limitations,a one-phase grouting system regulated by the urease inhibitor N-butylthiophosphoryl triamide(NBPT)was developed,aiming to synergistically enhance impermeability and mechanical performance through optimized reaction kinetics.The optimal NBPT concentration(0.15 mmol/L)was determined through orthogonal experiments,and systematic comparisons with conventional two-phase grouting were conducted via variable-head permeability tests,unconfined compressive strength measurements,and cementation distribution analyses.The experimental results demonstrate that urea decomposition was delayed by over 24 h at the optimal NBPT concentration,enabling an effective cementation fluid diffusion radius of 1.5 m-1.8 m.The permeability coefficient was reduced to 5.1×10^(-7) cm/s,while the compressive strength was increased to 1.92 MPa,accompanied by a cementation uniformity index of 0.86.The proposed technique was validated in a complete construction through a single grouting operation,with efficiency enhanced.Furthermore,NBPT exhibited a 14-day half-life,and its residual soil concentration was maintained below 0.1 mg/kg after 90 days,with ecological risks further minimized when integrated with biochar adsorption.By implementing a spatiotemporally matched time-delay reaction mechanism,critical drawbacks of conventional processes(including localized clogging and performance trade-offs)were effectively resolved.This innovation provides a high-efficiency,low-carbon solution for critical infrastructure applications such as embankment seepage control and foundation stabilization.

关 键 词：MICP 脲酶抑制剂 一相注浆 抗渗性能 工程加固 

分 类 号：TU41[建筑科学—岩土工程]