钙离子和碳酸钙:控制土壤分散性的酶矿化关键调节剂

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Guanzhou Ren, Minqiang Meng, Henghui Fan, Jixiang Wen, Jianwei Zhang, Gaowen Zhao, Xiujuan Yang, Zengchun Sun, Xiang He
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引用次数: 0

摘要

分散性土壤是世界上干旱或半干旱地区广泛分布的问题土壤,可造成管道侵蚀、沟渠破坏和其他渗流故障。本研究分析了环保型酶诱碳酸盐沉淀法(EICP)对分散性土壤分散性的影响。根据针孔试验和泥球试验的结果,该方法对三种分散性土壤类型(两种高钠土壤、两种低粘土含量土壤和两种高钠低粘土含量土壤)进行了稳定化试验,以考察其对分散性的影响。此外,还进行了物理、化学、机械和显微测试,以研究 EICP 反应溶液中的成分对分散性土壤改性的影响。实验表明,随着土壤中粘土含量的增加,限制分散性所需的反应溶液浓度和固化时间也随之减少。Ca2+ 通过四种不同的机制限制了分散性土壤的分散性。第一种机制是离子交换;Ca2+ 将可交换钠离子的百分比降至 7% 以下,同时减少了扩散双层的厚度,从而减少了土壤颗粒之间的间距,限制了化学分散性。其次,Ca2+ 盐化了大豆脲酶中的有机物,从而增加了溶液的粘度。随后,D1 级物理分散性土壤转化为 ND2 级非分散性土壤。第三,Ca2+ 通过减少 CO32- 的含量来降低土壤 pH 值,而 CO32- 可以水解来增加土壤碱度。最后,Ca2+ 的存在通过 CaCO3 晶体的沉淀产生了胶结矿物,这些晶体不断生成 CO32-,填充和胶结土壤颗粒,从而限制了它们的物理分散性。这些结果表明,低浓度 EICP 反应溶液可有效控制三种分散性土壤的分散性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control

Calcium ions and calcium carbonate: key regulators of the enzymatic mineralization for soil dispersivity control

Dispersive soil is a widely distributed problematic soil in arid or semiarid areas of the world and can cause pipe erosion, gully damage and other seepage failures. This study analyzed the effect of environmentally friendly enzyme-induced carbonate precipitation (EICP) on the dispersivity of dispersive soils. This methodology was tested for the stabilization of three dispersive soil types (two high-sodium soils, two low-clay-content soils, and two soils with both high sodium and low clay contents) to examine the impact on dispersivity based on the results of pinhole tests and mud ball tests. Physical, chemical, mechanical, and microscopic tests were also conducted to investigate the effects of the components in the EICP reaction solution on dispersive soil modification. The experiments showed that the concentration of the reaction solution and the curing time required to limit the dispersivity decreased with increasing clay content in the soil. Ca2+ limited the dispersivities of dispersive soils via four distinct mechanisms. The first mechanism was ion exchange; Ca2+ decreased the percentage of exchangeable sodium ions to less than 7% while reducing the thickness of the diffuse double layer such that the spacings between soil particles were reduced and the chemical dispersivity was limited. Second, Ca2+ increased the viscosity of the solution by salting out the organic matter present in the soybean urease. Subsequently, the D1-class physically dispersive soil was converted into an ND2-class nondispersive soil. Third, Ca2+ decreased the soil pH by reducing the CO32− content, which could hydrolyze to increase the soil alkalinity. Finally, the presence of Ca2+ led to the generation of cementitious minerals through the precipitation of CaCO3 crystals that continuously generated CO32−, filling and cementing soil particles and thereby limiting their physical dispersivity. These results indicated that a low-concentration EICP reaction solution efficiently controlled the dispersivities of the three dispersive soils.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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