Study on Influence of Excess Urea in MICP Cementation Solution

Zhiming LIU; Yicheng SUN; Qingpeng FENG; Jie PENG

doi:10.13409/j.cnki.jdpme.2020.04.011

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Study on Influence of Excess Urea in MICP Cementation Solution

更新时间：2025-09-25

- Study on Influence of Excess Urea in MICP Cementation Solution
- Journal of Disaster Prevention and Mitigation Engineering Vol. 40, Issue 4, Pages: 574-580(2020)
- 作者机构：
  
  1.河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098
  2.江苏省岩土工程技术工程研究中心(河海大学)，江苏南京 210098
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.2020.04.011
  CLC： TU43
- Received：23 May 2018，
  
  Revised：2018-10-08，
  
  Published：15 August 2020
- 稿件说明：
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刘志明,孙益成,冯清鹏等.MICP胶结液中尿素过量的影响研究[J].防灾减灾工程学报,2020,40(04):574-580.

LIU Zhiming,SUN Yicheng,FENG Qingpeng,et al.Study on Influence of Excess Urea in MICP Cementation Solution[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):574-580.
刘志明,孙益成,冯清鹏等.MICP胶结液中尿素过量的影响研究[J].防灾减灾工程学报,2020,40(04):574-580. DOI： 10.13409/j.cnki.jdpme.2020.04.011.

LIU Zhiming,SUN Yicheng,FENG Qingpeng,et al.Study on Influence of Excess Urea in MICP Cementation Solution[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):574-580. DOI： 10.13409/j.cnki.jdpme.2020.04.011.

摘要

分析了研究人员对于胶结液中尿素对MICP影响的不同认识之间存在的分歧

利用水溶液试验及一维砂柱加固试验，对比研究了胶结液中尿素过量（双倍浓度）对MICP的影响。在水溶液和砂柱中，进行了三种氯化钙浓度（0.25 M，0.5 M

1.0 M）条件下尿素过量与否的对比试验。测试对比了水溶液试验过程中NH

，Ca

变化规律、砂柱试验中Ca

消耗，CaCO

生成情况和砂柱无侧限强度等。研究结果表明：(1)水溶液试验中，过量的尿素在反应初期不利于尿素水解与碳酸钙沉积; (2)在砂柱试验中，过量的尿素也对MICP不利，加固后土体强度较低，加固效果较差; (3)砂柱试验中这一现象与注浆方式（间隔12 h直灌式注浆）和较短的胶结液停留时间有关; (4)在水溶液和砂柱两种环境下，低氯化钙浓度（0.25 M）情况下尿素过量对MICP的影响都最为明显。

Abstract

The controversy of researchers on the effect of urea in cementation solution on MICP was analyzed. The effects of excess urea (double concentration) on MICP were compared and studied through a series of aqueous tests and cemented tests on one-dimensional sand column. Comparison tests were carried out on the aqueous solution and the sand column under the condition of three concentrations of CaCl2 (0.25M

0.5M

1.0M). Changes of NH4+

Ca2+ in the water solution

Ca2+ consumption

CaCO3 formation and compression strength of the sand samples in the sand column tests were compared and analyzed. The results show that: (1) In aqueous test

excess urea has an adverse effect on urea hydrolysis and calcium carbonate deposition at the early stage of the reaction;(2) In sand column test

excess urea is also unfavorable to MICP and leads to lower strength of soil sample; (3) The phenomenon in the sand column test is related to injection method and short retention time of the cement (direct grouting at intervals of 12h); (4) The negative effect of excess urea on MICP under low calcium chloride concentration (0.25M) is most pronounced in both aqueous and sand column environments.

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Keywords

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