基于MICP技术的海上风电场滩涂软土固化试验研究  

EXPERIMENTAL INVESTIGATION ON CONSOLIDATION OF SOFT SOIL IN MUDFLAT OF OFFSHORE WIND FARM BASED ON MICP TECHNOLOGY

作　　者：朱晨俊 温小栋[1] 吴佳育 温维 李超恩 孙志伟 Zhu Chenjun;Wen Xiaodong;Wu Jiayu;Wen Wei;Li Chaoen;Sun Zhiwei(Zhejiang Engineering Technology Research Center for Civil Engineering Industrialized Construction,Ningbo University of Technology,Ningbo 315211,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]宁波工程学院浙江省土木工程工业化建造工程技术研究中心,宁波315211 [2]同济大学土木工程学院,上海200092

出　　处：《太阳能学报》2024年第11期467-476,共10页Acta Energiae Solaris Sinica

基　　金：宁波市科技创新2025重大专项(2018B10091,2022Z230);国家级大学生创新创业训练计划(202211058003)。

摘　　要：针对基于微生物诱导碳酸钙沉淀(MICP)技术,研究浆料芽孢杆菌在不同pH值和有无钙源的常温培养环境下菌液浓度随时间的变化情况。以宁波滩涂淤泥为研究对象,考虑滨海相软土特性及边坡结构特点,利用巴氏芽孢杆菌诱导碳酸盐对滨海软土进行固结处理。通过压缩、渗透及雨水冲刷试验,并结合X射线衍射(XRD)和扫描电子显微镜(SEM)表征结果,从宏、细观角度分析固化效果及抗冲刷性。研究结果表明:在pH值为7.3的环境下,芽孢杆菌生长最快,在培养约48 h后,其浓度达到峰值;Ca^(2+)会抑制芽孢杆菌的生长,但在生长前期影响较小,而后期影响较大;菌液浓度为1/100的重塑土经养护7 d后,其压缩系数降低19.58%,渗透系数降低87.34%;雨水冲刷结束后剥蚀率仅为3.9 g/(m^(2)·s);芽孢杆菌诱导结晶形成填充并胶结于土颗粒之间的CaCO_(3)晶体聚集体结构,这使得滨海软土具有更好的固结性能、抗渗性能以及坡面抗冲蚀效果提升。During the process of wind power infrastructure construction in coastal tidal flat areas,the problem of mud improvement and solidification as well as reuse in tidal flats is becoming increasingly prominent.Compared with traditional soil chemical reinforcement methods,soil reinforcement technology based on Microbially Induced Calcium Carbonate Precipitation(MICP)has advantages such as low pollution and low energy consumption.In this study,the changes in bacterial liquid concentration over time were investigated under different pH values and with or without calcium sources in a room temperature culture environment using spore-forming bacteria slurry.Taking Ningbo tidal flat mud as the research object and considering the characteristics of coastal soft soil and slope structures,Bacillus pasteurii was used to induce carbonate consolidation treatment on coastal soft soil.Through compression,permeability,rainwater erosion tests,combined with X-ray diffraction(XRD)and scanning electron microscopy(SEM)characterization results,the consolidation effect and erosion resistance were analyzed from macroscopic and microscopic perspectives.The results showed that under an environment with a pH value of 7.3,spore-forming bacteria grew fastest,reaching peak concentration at around 48 hours of cultivation;calcium ions inhibited bacterial growth but had a smaller impact during early growth stages compared to later stages;after curing for 7 days with a bacterial liquid concentration of 1/100th by weight ratio reshaping soil sample,its compression coefficient decreased by 19.58%while its permeability coefficient decreased by 87.34%;after rainwater erosion ended,the erosion rate was only 3.9 g/(m^(2)·s);spore-forming bacteria induced crystallization formed carbonated calcium crystal aggregates filling between soil particles which improved consolidation performance,impermeability performance,and slope surface erosion resistance.

关 键 词：海上风电 微生物诱导碳酸钙沉积 土壤加固 微观结构 滨海相软土 

分 类 号：TU476[建筑科学—结构工程]