| 446 | 2 | 19 |
| 下载次数 | 被引频次 | 阅读次数 |
【目的】探讨酶诱导碳酸盐沉淀(EICP)技术联合废弃混凝土碎料加固黄泛区粉土的关键参数与应用价值，为该类岩土工程缺陷治理及废弃混凝土资源化利用提供实践指导。【方法】以黄泛区粉土为研究对象，通过直接剪切试验研究不同材料配比下土壤的抗剪强度特性，并利用扫描电子显微镜(SEM)观察未加固粉土与不同加固条件下土体的孔隙结构。【结果】(1)单一EICP技术可有效减少粉土孔隙并提高其强度；在此基础上添加适量废弃混凝土碎料后，土体孔隙进一步减少，土体强度显著提高。(2)随着EICP反应液掺量增加，加固土体的黏聚力和内摩擦角均呈现先增大后减小的趋势，其中EICP反应液对粉土黏聚力的影响较内摩擦角的更为显著，确定22.50%为EICP反应液的较佳掺量。(3)在此基础上掺加废弃混凝土碎料，黏聚力随掺合料掺入比增加先增后减，内摩擦角则呈减—增—减的变化趋势，其中废弃混凝土碎料对粉土黏聚力的影响较大，确定10%作为掺合料的较佳掺入比。在该混合配比下，加固土体的黏聚力和内摩擦角较单一EICP技术分别提高了100.04%和17.04%。【结论】EICP反应液掺量22.50%、废弃混凝土碎料掺入比10%是该复合加固技术改良黄泛区粉土的较佳配比，通过碳酸钙沉淀胶结与碎料物理填充，能有效减少土体孔隙、强化颗粒黏结，显著提升其抗剪强度。
Abstract：【Objective】 This study explores the key parameters and application potential of enzyme-induced carbonate precipitation(EICP) technology combined with waste concrete fine aggregates for silt reinforcement in the Yellow River floodplain, in order to provide practical guidance for geotechnical defect remediation and the resource utilization of waste concrete. 【Methods】 Silt from the Yellow River floodplain was taken as the research object. Direct shear tests were conducted to investigate the shear strength characteristics of soils with different material ratios. Scanning electron microscopy(SEM) was employed to observe the pore structure of unreinforced silt and soils under different reinforcement conditions. 【Results】(1) The application of EICP alone effectively reduced soil porosity and improved soil strength. On this basis, the addition of an appropriate amount of waste concrete fine aggregates further reduced soil porosity and significantly enhanced soil strength.(2) With increasing EICP solution content, both the cohesion and internal friction angle of the reinforced soil exhibited a trend of first increasing and then decreasing. The influence of the EICP solution on cohesion was greater than that on the internal friction angle, and 22.50% was determined as the optimal dosage of the EICP solution.(3) After adding waste concrete fine aggregates, soil cohesion first increased and then decreased with increasing admixture ratio, whereas the internal friction angle showed a variation trend of decrease-increase-decrease. Waste concrete fine aggregates had a greater impact on silt cohesion, and 10% was identified as the optimal admixture ratio. Under this mixed ratio, the cohesion and internal friction angle of the reinforced soil increased by 100.04% and 17.04%, respectively, compared with those obtained via the EICP alone. 【Conclusion】 An EICP solution content of 22.50% combined with a waste concrete fine aggregate content of 10% constitutes the optimal mixture for modifying silty soil in the Yellow River floodplain. Through calcium carbonate precipitation cementation and physical filling by the aggregates, soil porosity is effectively reduced, particle bonding is strengthened, and shear strength is significantly improved.
[1] WHIFFIN V S,VAN PAASSEN L A,HARKES M P.Microbial carbonate precipitation as a soil improvement technique[J].Geomicrobiology Journal,2007,24(5):417-423.
[2] CHOU C W,SEAGREN E A,AYDILEK A H,et al.Biocalcification of sand through ureolysis[J].Journal of Geotechnical and Geoenvironmental Engineering,2011,137(12):1179-1189.
[3] BURBANK M,WEAVER T,LEWIS R,et al.Geotechnical tests of sands following bioinduced calcite precipitation catalyzed by indigenous bacteria[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(6):928-936.
[4] MONTOYA B M.Bio-mediated soil improvement and the effect of cementation on the behavior,improvement,and performance of sand[D].Davis:University of California,2012.
[5] GOMEZ M G,MARTINEZ B C,DEJONG J T,et al.Field-scale bio-cementation tests to improve sands[J].Proceedings of the Institution of Civil Engineers-Ground Improvement,2015,168(3):206-216.
[6] JIA Y,CHEN J.Laboratory study on the use of urease-induced calcium carbonate precipitation for stabilization of coal fly ash[J].Minerals,2023,13(2):185.
[7] DILRUKSHI RA,NAKASHIMA K,KAWASAKI S.Soil improvement using plant-derived urease-induced calcium carbonate precipitation[J].Soils and Foundations,2018,58(4):894-910.
[8] HOANG T,ALLEMAN J,CETIN B,et al.Sand and silty-sand soil stabilization using bacterial enzyme-induced calcite precipitation (BEICP)[J].Canadian Geotechnical Journal,2019,56(6):808-822.
[9] CUI M J,LAI H J,HOANG T,et al.One-phase-low-pH enzyme induced carbonate precipitation (EICP) method for soil improvement[J].Acta Geotechnica,2021,16(2):481-489.
[10] KHODADADI TIRKOLAEI H,JAVADI N,KRISHNAN V,et al.Crude urease extract for biocementation[J].Journal of Materials in Civil Engineering,2020,32(12):04020374.
[11] LIU Y,GAO Y,ZHOU Y,et al.Evaluation of enzyme-induced carbonate precipitation using crude soybean urease during soil percolation[J].Acta Geotechnica,2024,19(3):1571-1580.
[12] 王磊，王博，刘志强，等.基于脲酶诱导碳酸钙沉淀的土体固化研究进展[J].工业建筑，2022,52(11):57-66.[WANG L,WANG B,LIU Z Q,et al.Advances of soil cemented by enzyme induced calcium carbonate precipitation[J].Industrial Construction,2022,52(11):57-66.]
[13] MENG H,SHU S,GAO Y F,et al.Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement[J].Engineering Geology,2021,294:106374.
[14] HE J,YANG F,QI Y S,et al.Improvement in silty sand with enzyme-induced carbonate precipitation:laboratory model experiment[J].Acta Geotechnica,2022,17(7):2895-2905.
[15] 田威，李腾，贾能，等.木钙源EICP溶液固化路基黄土性能研究[J].材料导报，2022,36(15):78-85.[TIAN W,LI T,JIA N,et al.Properties of subgrade loess solidified by calcium lignosulfonate-EICP solution[J].Materials Reports,2022,36(15):78-85.]
[16] IAMCHATURAPATR J,PIRIYAKUL K,PETCHERDCHOO A.Characteristics of sandy soil treated using EICP-based urease enzymatic acceleration method and natural hemp fibers[J].Case Studies in Construction Materials,2022,16:e00871.
[17] 张建伟，李想，韩智光，等.废弃口罩加筋酶诱导碳酸盐沉淀固化砂土的抗剪强度特性[J].复合材料学报，2024,41(1):426-437.[ZHANG J W,LI X,HAN Z G,et al.Shear strength characteristics of sand solidified by enzyme-induced carbonate precipitation with waste face mask reinforcement[J].Acta Materiae Compositae Sinica,2024,41(1):426-437.]
[18] 黄安国，何稼，邵应峰.EICP联合纤维加固边坡表层抗侵蚀试验研究[J].河南科学，2022,40(9):1411-1421.[HUANG A G,HE J,SHAO Y F.Experimental study on erosion resistance of slope surface reinforced by EICP combined with fiber[J].Henan Science,2022,40(9):1411-1421.]
[19] 南钰，蔡瀚琛，郑罡，等.黄河冲积粉土的渗透特性研究[J].科学技术创新，2024,28(2):155-158.[NAN Y,CAI H C,ZHENG G,et al.Study on the permeability characteristics of alluvial silt in the Yellow River[J].Scientific and Technological Innovation,2024,28(2):155-158.]
[20] 王昊，韦金城，宋晓辉，等.黄泛区粉土工程特性及其改性固化研究进展[J].粉煤灰综合利用，2023,37(5):107-119.[WANG H,WEI J C,SONG X H,et al.A review of engineering properties of silt in the Yellow River flood area and its modification and solidification[J].Fly Ash Comprehensive Utilization,2023,37(5):107-119.]
[21] 肖志阳，程留全，葛飞，等.微生物加固黄河中下游典型粉土的影响因素分析[J].华北水利水电大学学报(自然科学版),2019,40(3):94-98.[XIAO Z Y,CHENG L Q,GE F,et al.Factors affecting bio-cemented typical silt from the middle and lower reaches of the Yellow River[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2019,40(3):94-98.]
[22] 傅为忠，潘玉，王丹.双碳背景下中国建筑垃圾资源循环产业政策量化评价研究：基于PMC指数模型[J].工业技术经济，2022,41(8):134-142.[FU W Z,PAN Y,WANG D.Quantitative evaluation of industrial policies of construction waste resource recycling in China under dual carbon background—based on PMC index model[J].Journal of Industrial Technology and Economy,2022,41(8):134-142.]
[23] 徐进财，李静，娄广辉.建筑垃圾的源头减量化及资源化利用研究[J].河南科技，2021,40(33):113-118.[XU J C,LI J,LOU G H.Study on source reduction and resource utilization of construction waste[J].Henan Science and Technology,2021,40(33):113-118.]
[24] 李克亮，弓晋伟，申翔宇，等.再生骨料裹浆改性用碱激发材料浆液配比优化[J].华北水利水电大学学报(自然科学版),2024,45(1):73-82.[LI K L,GONG J W,SHEN X Y,et al.Optimization of slurry mix ratio of alkali-activated materials for recycled aggregate modification[J].Journal of North China University of Water Resources and Electric Power (Natural Science Edition),2024,45(1):73-82.]
[25] 杨欣，唐宇，梁宁慧.聚丙烯纤维再生混凝土主破裂前兆特征研究[J].地下空间与工程学报，2024,20(4):1247-1256.[YANG X,TANG Y,LIANG N H.Study on main fracture precursor characteristics of polypropylene fiber recycled concrete[J].Chinese Journal of Underground Space and Engineering,2024,20(4):1247-1256.]
[26] GAO Y F,HE J,TANG X Y,et al.Calcium carbonate precipitation catalyzed by soybean urease as an improvement method for fine-grained soil[J].Soils and Foundations,2019,59(5):1631-1637.
[27] 吴林玉，缪林昌，孙潇昊，等.植物源脲酶诱导碳酸钙固化砂土试验研究[J].岩土工程学报，2020,42(4):714-720.[WU L Y,MIAO L C,SUN X H,et al.Experimental study on sand solidification using plant-derived urease-inducedcalcium carbonate precipitation[J].Chinese Journal of Geotechnical Engineering,2020,42(4):714-720.]
[28] WHIFFIN V S.Microbial CaCO3 precipitation for the production of biocement[D].Perth West Australia:Morduch University,2004.
[29] 崔猛，符晓，郑俊杰，等.黄豆脲酶诱导碳酸钙沉淀多变量试验研究[J].岩土力学，2022,43(11):3027-3035.[CUI M,FU X,ZHENG J J,et al.Multivariate experimental study on soybean urease induced calcium carbonate precipitation[J].Rock and Soil Mechanics,2022,43(11):3027-3035.]
[30] YUAN H,REN G,LIU K,et al.Experimental study of EICP combined with organic materials for silt improvement in the yellow river flood area[J].Applied Sciences,2020,10(21):7678.
[31] OLIVEIRA P J,FREITAS L D,CARMONA J P.Effect of soil type on the enzymatic calcium carbonate precipitation process used for soil improvement[J].Journal of Materials in Civil Engineering,2017,29(4):04016263.
[32] PARK S S,CHOI S G,NAM I H.Effect of plant-induced calcite precipitation on the strength of sand[J].Journal of Materials in Civil Engineering,2014,26(8):06014017.
[33] WEN K,LI Y,AMINI F,et al.Impact of bacteria and urease concentration on precipitation kinetics and crystal morphology of calcium carbonate[J].Acta Geotechnica,2020,15(1):17-27.
[34] 李迎春，钱春香，刘松玉，等.粉土固化稳定机理研究[J].岩土工程学报，2004,26(2):268-271.[LI Y C,QIAN C X,LIU S Y,et al.Mechanism of silt stabilization[J].Chinese Journal of Geotechnical Engineering,2004,26(2):268-271.]
[35] 杨晨，贾永祥，杨啸，等.磷石膏基充填胶凝材料配方优选及水化机理[J].华北水利水电大学学报(自然科学版),2024,45(5):100-108.[YANG C,JIA Y X,YANG X,et al.Formulation optimization and hydration mechanism of phosphogypsum-based filling cementitious materials[J].Journal of North China University of Water Resources and Electric Power (Natural Science Edition),2024,45(5):100-108.]
基本信息:
DOI：10.19760/j.ncwu.zk.2026016
中图分类号:TU41
引用信息:
[1]郭玉芳,孔德志,原华.EICP联合废弃混凝土碎料固化黄泛区粉土试验研究[J].华北水利水电大学学报(自然科学版),2026,47(01):142-151.DOI:10.19760/j.ncwu.zk.2026016.
基金信息:
河南省社发领域科技攻关项目(202102310247)
2024-11-18
2024-11-18
2024-11-18