Strength and uniformity of EICP-treated sand under multi-factor coupling effects

Biogeotechnics Pub Date : 2023-03-01 DOI:10.1016/j.bgtech.2023.100007

Jianwei Zhang , Yue Yin , Wanpeng Shi , Hanliang Bian , Lei Shi , Luyuan Wu , Zhiguang Han , Junjie Zheng , Xiang He

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引用次数: 6

Abstract

Enzyme-induced carbonate precipitation (EICP) is an environment-friendly method for improving soil mechanical properties. The extraction and application of plant crude urease reduces the treatment cost. However, in terms of the efficiency of calcium carbonate production and cementation, crude urease is considered inferior to pure urease or urease bacteria. In this paper, urease extracted from soybean was used to explore the effects of urease activity, treatment method, number of treatments (NTs), injection rate, and curing time on the unconfined compressive strength and calcium carbonate distribution characteristics of EICP-treated sand. The results showed that, compared with the pre-mixing method and the two-phase method, the one-phase method produced higher strength and a more uniform distribution of calcium carbonate. The cementation efficiency decreased with the increase of urease activity. The high-rate injection can improve the treatment effect of high-activity urease. Under the same cementation level, high strength and calcium carbonate cementation efficiency can be achieved by one-phase-low-activity EICP treatment.

Data Availability Statement

All data, models, and code generated or used during the study appear in the submitted article.

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多因素耦合作用下eicp处理砂的强度和均匀性

酶促碳酸盐沉淀（EICP）是一种改善土壤力学性能的环保方法。植物粗脲酶的提取和应用降低了处理成本。然而，就碳酸钙的生产和胶结效率而言，粗脲酶被认为不如纯脲酶或脲酶细菌。以大豆中提取的脲酶为材料，探讨了脲酶活性、处理方法、处理次数、注入速率和固化时间对EICP处理砂无侧限抗压强度和碳酸钙分布特征的影响。结果表明，与预混合法和两相法相比，单相法产生了更高的强度和更均匀的碳酸钙分布。胶结效率随脲酶活性的增加而降低。高倍率注射可提高高活性脲酶的处理效果。在相同的胶结水平下，采用一相低活性EICP处理可以获得较高的强度和碳酸钙胶结效率。数据可用性声明研究期间生成或使用的所有数据、模型和代码都出现在提交的文章中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biogeotechnics

CiteScore

3.00

自引率

0.00%

发文量