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磷石膏-酶诱导碳酸盐沉淀（EICP）固化黄土可行性的试验研究

Experimental research on the feasibility of phosphogypsum-enzyme induced carbonate precipitation (EICP) solidified loess.

作者信息

Dang Tao, Ji Yuanzhu, Guo Yuanquan, Ma Fangchen, Zhang Zhiyi, Liang Baozhen, Rong Xuewen

机构信息

School of Highways, Chang'an University, Xi'an, 710064, Shaanxi, China.

Shaanxi Huashan Road and Bridge Group Co., Ltd., Xi'an, 712000, Shaanxi, China.

出版信息

Sci Rep. 2025 Aug 13;15(1):29683. doi: 10.1038/s41598-025-15229-9.

DOI:10.1038/s41598-025-15229-9
PMID:40804456
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12350642/
Abstract

To improve the effect of bio-cemented loess, taking into account the characteristics of phosphogypsum and the biochemical principle of enzyme-induced calcium precipitation (EICP), a series of mechanical and microscopic tests are designed and carried out to systematically analyze the enhancement effect of phosphogypsum enhanced EICP solidified loess and the enhancement mechanism. Concentrations of urea and calcium chloride as variables, and unconfined compressive strength (UCS) as an indicator to determine the optimal solution ratio of EICP. Subsequently, different phosphogypsum incorporation ratios were considered to determine the optimal mix proportion for EICP-phosphogypsum co-stabilized loess.The results showed that the addition of phosphogypsum can effectively improve the UCS, water stability, shear strength, and compression characteristics of EICP solidified loess. The phosphogypsum-EICP method has a better effect on improving the strength and water stability of loess with the content of phosphogypsum at 1.0%, compared with the loess treated by EICP, the strength of the specimen with 1.0% phosphogypsum content increased by 19.7%. The microstructure of the solidified loess specimens indicates that the calcium carbonate crystals generated by EICP fill the pores in the loess, thereby reducing its porosity. In addition, phosphogypsum reacts with water to produce hydration, resulting in stronger cementation between calcium carbonate and soil particles.

摘要

为提高生物水泥黄土的效果，考虑到磷石膏的特性及酶诱导钙沉淀（EICP）的生化原理，设计并开展了一系列力学和微观试验，以系统分析磷石膏增强EICP固化黄土的增强效果及增强机理。以尿素和氯化钙浓度为变量，以无侧限抗压强度（UCS）为指标确定EICP的最佳溶液配比。随后，考虑不同的磷石膏掺入比，确定EICP - 磷石膏协同稳定黄土的最佳配合比。结果表明，添加磷石膏可有效提高EICP固化黄土的无侧限抗压强度、水稳定性、抗剪强度和压缩特性。磷石膏 - EICP方法对提高黄土强度和水稳定性效果较好，当磷石膏含量为1.0%时，与EICP处理的黄土相比，含1.0%磷石膏试样的强度提高了19.7%。固化黄土试样的微观结构表明，EICP产生的碳酸钙晶体填充了黄土中的孔隙，从而降低了其孔隙率。此外，磷石膏与水发生水化反应，使碳酸钙与土颗粒之间的胶结作用更强。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/b16cc590f42f/41598_2025_15229_Fig14_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/b16cc590f42f/41598_2025_15229_Fig14_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/98a0971ca0c5/41598_2025_15229_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/009595f9093d/41598_2025_15229_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/8a33e8ce9b58/41598_2025_15229_Fig3_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/a311efef05c7/41598_2025_15229_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/27bc9b9bcabb/41598_2025_15229_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/1d3620d3f45c/41598_2025_15229_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/89d60a13fb02/41598_2025_15229_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/504325b7ecb0/41598_2025_15229_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/f1a8eaa548ec/41598_2025_15229_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/3c234a1930f2/41598_2025_15229_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/cf34b1f95548/41598_2025_15229_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/e375c9c2fb84/41598_2025_15229_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2457/12350642/b16cc590f42f/41598_2025_15229_Fig14_HTML.jpg

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Microbially-Induced Calcium Carbonate Precipitation Test on Yellow Sandstone Based on LF-NMR Monitoring.基于 LF-NMR 监测的黄沙岩微生物诱导碳酸钙沉淀试验。
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