豆皮脲酶诱导碳酸盐沉淀固化砂土抗风蚀性能试验研究∗
作者:
作者单位:

1.河海大学港口海岸与近海工程学院,江苏 南京 210098 ; 2.河海大学海岸灾害及防护教育部重点实验室,江苏 南京 210098 ; 3.江苏省震灾风险防治中心, 江苏 南京 210014

作者简介:

谭慧明(1980—),男,教授,博导,博士。主要从事生物岩土与防灾减灾研究。E-mail:thming2008@163.com

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中图分类号:

TU411

基金项目:

国家自然科学基金项目(52078187)资助


Experimental Study on Wind Erosion Resistance of Sandy Soil Stabilized by Enzyme‑Induced Carbonate Precipitation with Urease from Soybean Skin
Author:
Affiliation:

1.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098 , China ; 2.Key Laboratory of Coastal Disaster and Defence-Hohai University, Ministry of Education, Nanjing 210098 , China ; 2.Jiangsu Earthquake Disaster Risk Mitigation Center, Nanjing 210014 , China

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    摘要:

    为控制海岸风沙侵蚀灾害、探索可行高效的海岸防风固沙新技术,基于酶诱导碳酸钙沉淀(EICP)原理开发以浓缩海水为可溶性钙盐溶液、以废弃豆皮为脲酶源的EICP固沙技术,开展了固化砂土风蚀试验,研究分析了脲酶活性、反应液喷洒量、处理次数、固化时间以及海盐浓度对固化效果的影响。研究发现,大豆种皮脲酶的活性在 10~65 ℃范围内随温度升高而增加,随豆皮用量增大而增加,但脲酶提取时的离心时间和离心转速对脲酶活性无明显影响。采用大豆种皮与海水作为原料的EICP固化试样,能达到防风固砂的效果。当脲酶活性固定时,增加处理次数、喷洒量和固化时间可提高表面贯入强度,但达到一定阈值后效果逐渐减弱。在反应液总量相同的情况下, 分批多次处理的碳酸盐沉淀生成率更高;起动风速较大,抗风蚀效果较好,相比之下,一次集中处理的效果较差。 为获得较好的抗风蚀效果,浓缩海水的浓度不应低于0.6 mmol/L,固化时间不超过12 h。

    Abstract:

    To control coastal wind erosion and explore feasible and efficient new technologies for coastal windbreaks and sand fixation, this study developed the Enzyme-Induced Calcium Carbonate Precipitation (EICP) sand stabilization technique. The technique used concentrated seawater as a soluble calcium salt solution and discarded soybean husks as a source of enzyme urease. Wind erosion tests on stabilized sand were conducted, and the effects of urease activity, spray volume of the reaction fluid, number of treatments, curing time, and seawater salinity on stabilization efficacy were analyzed. Results indicated that the activity of urease from soybean skin increased with rising temperatures within the range of 10-65°C and also increased with the amount of soybean skin used. Centrifugation time and speed during urease extraction had no significant effect on urease activity. Samples solidified with soybean skin and seawater demonstrated effective windbreak and sand fixation. When urease activity was fixed, an increased number of treatments, spray volume, and curing time enhanced surface penetration strength, though the effect gradually diminished beyond a certain threshold. With the same total volume of reaction fluid, multiple incremental treatments resulted in higher carbonate precipitation rates, higher threshold wind velocities, and better wind erosion resistance compared to a single centralized treatment. For optimal wind-erosion resistance, the concentration of concentrated seawater should not be lower than 0.6 mmol/L, and the curing time should not exceed 12 hours.

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谭慧明,赵祥运,徐烨.豆皮脲酶诱导碳酸盐沉淀固化砂土抗风蚀性能试验研究∗[J].防灾减灾工程学报,2024,44(6):1408-1417

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  • 收稿日期:2023-08-24
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  • 在线发布日期:2025-01-13
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