Effect of Different Proportion of Sand in Silt on Bio⁃cementation

ZHAO Zhifeng; ZHONG Yongliang

doi:10.13409/j.cnki.jdpme.20220307002

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Effect of Different Proportion of Sand in Silt on Bio⁃cementation

更新时间：2025-09-25

- Effect of Different Proportion of Sand in Silt on Bio⁃cementation
- Journal of Disaster Prevention and Mitigation Engineering Vol. 43, Issue 5, Pages: 1169-1175(2023)
- 作者机构：
  
  南京林业大学土木工程学院，江苏南京 210037
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20220307002
  CLC： TU472.4
- Received：07 March 2022，
  
  Revised：2022-04-16，
  
  Published：15 October 2023
- 稿件说明：
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赵志峰,仲勇亮.粉土中掺入不同比例砂粒对微生物胶结效果影响[J].防灾减灾工程学报,2023,43(05):1169-1175.

ZHAO Zhifeng,ZHONG Yongliang.Effect of Different Proportion of Sand in Silt on Bio⁃cementation[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1169-1175.
赵志峰,仲勇亮.粉土中掺入不同比例砂粒对微生物胶结效果影响[J].防灾减灾工程学报,2023,43(05):1169-1175. DOI： 10.13409/j.cnki.jdpme.20220307002.

ZHAO Zhifeng,ZHONG Yongliang.Effect of Different Proportion of Sand in Silt on Bio⁃cementation[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1169-1175. DOI： 10.13409/j.cnki.jdpme.20220307002.

摘要

土样的颗粒级配对微生物胶结效果存在影响，但目前的研究很不充分。通过向粉土中掺入砂粒来制备不同级配土样，砂粒占试样总质量的比重由0%增至40%。微生物选用巴氏芽孢杆菌，胶结液选用等比例的尿素和氯化钙溶液，加固方法采用两阶段注浆法。试验结果表明粉土中掺入砂土对于提高处理后的无侧限抗压强度有显著作用，碳酸钙生成量虽然有所减少但分布更均匀。密实度的提高有利于无侧限抗压强度的提升，但试样过于密实将对碳酸钙分布产生不利影响，碳酸钙相对集中在注浆口附近。当试样处于比较松散的状态下，粉土中掺入砂土越多（不超过40%），强度提升越多；密实状态下，粉土中掺入少量砂土（不超过20%）能有效提升强度。试样初始孔隙比越小，处理后的强度越高，但碳酸钙生成量有所下降。随着粉土中砂土掺入量增多、试样密实程度增加，碳酸钙晶体的尺寸有所减小，但数量显著增加。

Abstract

The particle size grade of soil has an impact on the effect of bio-cementation； however， the current research on this is insufficient. In this paper， mixed soil of marine silt and single graded sand is strengthened by grouting method. The proportion of sand in the total mass of the sample was increased from 0% to 40%. The compactness is divided into two degrees according to the dry density and initial void ratio of the sample. Sporosarcina pasteurii was selected as microorganism， while a urea and calcium chloride solution of equal proportion and low concentration were chosen as the cementing solution， utilizing a two-step grouting method. Based on unconfined compressive strength test， pore volume measurement， acid pickling determination of calcium carbonate and scanning electron microscope test， macro and micro analyses were performed. The test results show that the addition of sand in silt significantly improves the unconfined compressive strength of microbial solidified samples， reduces the production of calcium carbonate and distribute more evenly， which can reduce the treatment cost. The improvement of compactness is significant for the improvement of unconfined compressive strength， but too dense samples will have an adverse impact on the calcium carbonate distribution： calcium carbonate is too concentrated around the grouting mouth. In the loose state， the more sand is mixed in the silt （no more than 40%）， the more the strength is improved. In the dense state， adding a small amount of sand （no more than 20%） into the silt can effectively improve the strength. The smaller the initial void ratio， the greater the strength of the sample， and the less calcium carbonate produced. With the increase of sand content in silt， the sample becomes denser， crystal size decreases， and the number of crystals remarkably increases.

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