Effects of push-pull injection-suction spacing on sand biocementation treatment

IF 1.6 Q3 ENGINEERING, GEOLOGICAL

Geotechnical Research Pub Date : 2023-01-19 DOI:10.1680/jgere.22.00053

A. Omoregie, D. E. L. Ong, Phua Ye Li, Nurnajwani Senian, N. Hei, A. Esnault-Filet, K. Muda, P. M. Nissom

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Abstract

The process of ureolysis-driven biocementation is used to improve granular soils. The precipitation of calcium carbonate (CaCO3) crystals results from the reactions of urease generated by ureolytic bacteria and chemical reagents, which strengthen or bind soil particles together. Using a lab-based scaled physical model, this paper investigated the influence of selected spacing intervals (107 mm, 214 mm and 321 mm) on the effectiveness of biocementation via the injection-suction or ‘push-pull’ approach. Polystyrene moulds were used to create soil specimens. It was then injected with 6 cycles of the treatment solutions at the intervals stated. The compressive strengths and CaCO3 content of the biocemented soil specimens were measured after curing, as well as scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), Fourier-transform infrared (FTIR) spectroscopy, and effluent analysis (pH and ammonium measurements). The biocemented soil specimens with different spacing intervals obtained compressive strengths of 2.53 ±1.06 to 4.2 ±2.3 MPa, while the CaCO3 contents were from 2.78 ±0.3 to 11.16 ±1.5%, respectively. The elemental compositions and bonding of CaCO3 precipitates in the biocemented soil were confirmed by EDS and FTIR spectra, while SEM micrographs revealed chip-like and irregular rhombohedral crystal forms. The results demonstrated that injection spacing had an effect on MICP-treated biocemented soil.

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推拉喷射抽吸间距对砂生物胶结处理的影响

采用尿素分解驱动的生物胶结法对颗粒土进行改良。碳酸钙(CaCO3)结晶的沉淀是由解尿菌产生的脲酶与化学试剂反应产生的，这些反应使土壤颗粒加强或结合在一起。本文采用基于实验室的比例物理模型，研究了选定的间距(107 mm、214 mm和321 mm)对通过注射-吸入或“推拉”方法进行生物胶结效果的影响。聚苯乙烯模具被用来制作土壤样本。然后按规定的时间间隔注射6次处理溶液。测定养护后生物胶结土试样的抗压强度和CaCO3含量，并进行扫描电镜(SEM)、x射线能谱(EDS)、傅里叶变换红外光谱(FTIR)和出水分析(pH和铵测量)。不同间距的生物胶结土试样抗压强度为2.53±1.06 ~ 4.2±2.3 MPa, CaCO3含量为2.78±0.3 ~ 11.16±1.5%。通过EDS和FTIR光谱分析了CaCO3在生物胶结土壤中的元素组成和结合力，SEM显微图显示出片状和不规则的菱形晶体形式。结果表明，注入间距对micp处理的生物胶结土有影响。

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

Geotechnical Research ENGINEERING, GEOLOGICAL-

CiteScore

4.50

自引率

26.30%

发文量

审稿时长

12 weeks

期刊介绍： Geotechnical Research covers the full scope of geotechnics and its related disciplines including: Soil, rock and fluid mechanics; geoenvironmental engineering; geothermal engineering; geotechnical design and construction issues; analytical and numerical methods; physical modelling; micromechanics; transportation geotechnics; engineering geology; environmental geotechnology; geochemistry; geohydrology and water management.