Abstract: It is inevitable to strengthen the sandy soil in the construction of infrastructure on desertified land. The use of the Enzyme-induced carbonate precipitation (EICP) technique, an environmentally friendly method with less carbon emissions and soil and water pollution, can effectively improve the sandy soil’s engineering properties. In this work, the effects of various factors, including relative density, cementation solution concentration, and enzyme- cement ratios, on the strength of EICP-reinforced sandy soil were investigated through unconfined compressive strength tests. The findings indicate that the strength of EICP-reinforced sandy soil is influenced by both soil sample density and calcium carbonate content. For a given density, the strength of the reinforced soil shows a high positive correlation with calcium carbonate content. An optimal parameter combination is recommended to be a relative density of 0. 7, an enzyme-cement ratio of 1∶1, and a cementation solution concentration of 1 mol/L. Combined macroscopic test results with SEM and Micro-CT tests, it is revealed that the increase in peak stress of the reinforced soil is primarily due to the bonding, bridging and pore throat-blocking effects of calcium carbonate, while the increase in residual stress is attributed to the encapsulating effect. Calcium carbonate tends to divide larger pores into several smaller ones. Through the analyzing to the stress-strain curve of EICP-reinforced sandy soil, a damage evolution model was established based on the damage mechanics system, which aligns with the strain-softening characteristics of the reinforced soil. The fitting results indicate that this model can accurately predict the stress-strain relationship of EICP-reinforced sandy soil.
王剑烨, 李肖, 彭丽云, 王冬勇. EICP加固砂土的强度及应力-应变关系研究[J]. 材料导报, 2025, 39(11): 24070113-9.
WANG Jianye, LI Xiao, PENG Liyun, WANG Dongyong. Study on the Strength and Stress-Strain Relationship of EICP-Reinforced Sandy Soil. Materials Reports, 2025, 39(11): 24070113-9.
1 Song X, Wang T, Xue X, et al. Environmental Earth Sciences, 2015, 74(4), 3123. 2 Zhang Z, Huisingh D. Journal of Cleaner Production, 2018, 182, 765. 3 Yu X, Lei J, Gao X. Journal of Arid Land, 2022, 14(11), 1181. 4 Liu H L, Zhao M H. China Civil Engineering Journal, 2016, 49(1), 96(in Chinese). 刘汉龙, 赵明华. 土木工程学报, 2016, 49(1), 96. 5 Zhao J Q, Ding X M, Liu H L, et al. Rock and Soil Mechanics, 2023, 44(8), 2327(in Chinese). 赵津桥, 丁选明, 刘汉龙, 等. 岩土力学, 2023, 44(8), 2327. 6 Shi S, Gao L, Cai X, et al. Computers and Geotechnics, 2020, 124, 103574. 7 Zhang L, Wen P H, Wang Z H, et al. Materials Reports, 2017, 31(21), 98(in Chinese). 张磊, 问鹏辉, 王朝辉, 等. 材料导报, 2017, 31(21), 98. 8 Zhang L L, Hua S D, Zhu H J, et al. Materials Reports, 2020, 34(9), 9034(in Chinese). 张立力, 华苏东, 诸华军, 等. 材料导报, 2020, 34(9), 9034. 9 He J X, Xia W Z. Construction Economy, 2024, 45(1), 5(in Chinese). 何继新, 夏五洲. 建筑经济, 2024, 45(1), 5. 10 Liu L, Wang X, Wang Z. Greenhouse Gases-Science and Technology, 2023, 13(5), 732. 11 Peng L Y, Du X T, Qi J L, et al. Journal of Beijing Jiaotong University, 2023, 47(6), 154(in Chinese). 彭丽云, 杜辛涛, 齐吉琳, 等. 北京交通大学学报, 2023, 47(6), 154. 12 Liu Y, Gao Y, Zhou Y, et al. Acta Geotechnica, 2024, 19(3), 1571. 13 Liu L, Gao Y, Meng H, et al. Acta Geotechnica, 2024, 20, 1193. 14 He J, Liu Y, Liu L, et al. Biogeotechnics, 2023, 1(2), 100022. 15 Han L J, Li J S, Xue Q, et al. Constructionc and Building Materials, 2022, 314, 125577. 16 Tian W, Li T, JIA N, et al. Materials Reports, 2022, 36(15), 78(in Chinese). 田威, 李腾, 贾能, 等. 材料导报, 2022, 36(15), 78. 17 Muhammed A S, Kassim K A, Ahmad K, et al. International Journal of Environmental Science and Technology, 2021, 18(11), 3427. 18 Cui M J, Lai H J, Hoang T, et al. Acta Geotechnica, 2021, 16(2), 481. 19 Zhang J, Wang X, Shi L, et al. Construction and Building Materials, 2022, 339, 127792. 20 Gai X, Sanchez M. Acta Geotechnica, 2019, 14(3), 709. 21 Peng M. Influence of particle pradation optimization and calcium carbo-nate crystal morphology regulation on the solidification effect of sandy soil MICP. Master’s Thesis, China Three Gorges University, 2023(in Chinese). 彭萌. 颗粒级配优化和碳酸钙晶体形态调控对砂土MICP固化效果影响研究. 硕士学位论文, 三峡大学, 2023. 22 Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Standard Test Methods for Geotechnical Engineering:GB/T 50123-2019. China Planning Press, 2019(in Chinese). 中华人民共和国住房和城乡建设部. 土工试验方法标准:GB/T 50123-2019. 中国计划出版社, 2019. 23 Mortensen B M, DeJong J T. Dallas, Texas, American Society of Civil Engineers, 2011, 4012. 24 Zhang S, Liu Z, Li Z, et al. Biogeotechnics, 2023, 1(4), 100041. 25 Qin X, Xia Y, Wu J, et al. Energy & Fuels, 2022, 36(14), 7519.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2025, Vol. 39 
