Affiliation:
1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China
2. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
3. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract
In practical engineering applications, silt is prone to liquefaction and quicksand. This paper mainly studies the improvement effects of urease, lignin and their mixture on the strength and liquefaction resistance of silt. Based on the results and phenomena of an unconfined compressive strength and dynamic triaxial test, the improvement effects of the compressive strength, deformation resistance and liquefaction resistance of silt under different improvement schemes are analyzed, and the optimal values of the cement or lignin when enzyme-induced calcium carbonate precipitation (EICP) technology, lignin alone or EICP and lignin are obtained. The results show that the optimum concentration of the constant temperature and humidity sample (referred to as the constant humidity sample) and the constant temperature immersion sample (referred to as the soaking sample) of urease in the unconfined compressive strength test is 1.0 mol/L, and the compressive strength of the soaking sample is 4.9 MPa, which is 1.56 times that of the constant humidity sample; the optimum addition ratio of the lignin-improved constant humidity sample is 3%, and its compressive strength is 2.07 Mpa; the optimum addition ratio of the samples immersed at constant temperature is 4%, and the compressive strength is 3.05 MPa; when urease combines with lignin to improve silt, 4% is the best lignin addition ratio, the compressive strength of the constant humidity sample reaches 1.57 Mpa and the compressive strength of the soaking sample reaches 3.75 MPa; in the dynamic triaxial multi-stage cyclic load test, all samples were cured at constant humidity sample, and in the urease modified silt scheme, 1.0 mol/L was the optimal cement concentration; in the scheme of improving silt with lignin, 3% is the optimal addition ratio; when 1.25 mol/L cementation solution plus urease crude extract is combined with different ratios of lignin in the experimental scheme, 3% is the best lignin addition ratio.
Funder
Beijing Natural Science Foundation
National Natural Science Foundation of China
Subject
General Materials Science
Reference60 articles.
1. Investigation on deformation characteristics of wetting silt subgrade under aircraft loading;Luo;J. Cent. South Univ. Sci. Technol.,2021
2. The Bedrock and Earth Works of Compacted Powder Land in Coastal Areas;Wang;J. Coast. Res.,2020
3. Hendry, H., Imbang, R., Syahril, S., Somantri, A.K., and Pramaesti, R.M. (2019, January 26). The use of Lapindo mud and emulsion asphalt as mixed materials in clay stabilization to increase compressive strength. Proceedings of the 3rd International Conference on Innovation in Engineering and Vocational Education (ICIEVE), Univ Pendidikan Indonesia, Bandung, Indonesia.
4. Li, Y., Fang, Y., and Yang, Z. (2022). Two criteria for effective improvement depth of sand foundation under dynamic compaction using discrete element method. Comput. Part. Mech.
5. Pan, Y., Li, M., and Dai, R. (2020, January 4–5). Review on The Progress of Expansive Soil Improvement in Ten Years. Proceedings of the 6th International Conference on Environmental Science and Civil Engineering (ESCE), Nanchang, China.
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献