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清华大学学报(自然科学版)  2019, Vol. 59 Issue (8): 593-600    DOI: 10.16511/j.cnki.qhdxxb.2019.21.018
  微生物岩土技术 本期目录 | 过刊浏览 | 高级检索 |
MICP拌和固化钙质砂一维固结试验
郭红仙, 李东润, 马瑞男, 程晓辉
清华大学 土木工程系, 北京 100084
Oedometer test of calcareous sands solidified using the MICP mixing method
GUO Hongxian, LI Dongrun, MA Ruinan, CHENG Xiaohui
Department of Civil Engineering, Tsinghua University, Beijing 100084, China
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摘要 该文通过一维固结压缩试验,研究基于微生物诱导碳酸钙沉积(MICP)技术拌和固化岛礁钙质砂,并改善其压缩特性。总结了完全不同于石英砂的钙质砂的压缩特性;固化试验研究中考虑了粒径级配、相对密度以及反应液浓度对钙质砂压缩特性的影响。试验结果表明:尽管拌和固化钙质砂所用菌液和反应液的用量很小,但是固化后的钙质砂的压缩特性仍有较大改善,压缩指数平均降低了约0.10;固结压缩曲线e-lgp呈现2或3个明显直线段;固化效果受土体粒径级配和相对密度的影响,高浓度反应液更有利于土体压缩性的降低。
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郭红仙
李东润
马瑞男
程晓辉
关键词 钙质砂微生物诱导碳酸钙沉积(MICP)压缩特性粒径级配相对密度反应液    
Abstract:Microbially induced carbonate precipitation (MICP) was used to treat calcareous sand to improve the compressive properties of the sand. Oedometer tests showed how the compressive properties of the calcareous sand differed from quartz sand. The tests evaluated the effects of the particle size gradation, the relative density and the reaction solution concentration on the compressive properties of the carbonate sands. The tests showed that small amounts of bacteria solution and reaction solution mixed with the calcareous sand greatly improved the compressive properties of the sand after solidification with the compression index reduced by about 0.10 on average and the e-lgp curve having 2 or 3 distinct straight segments. The particle size gradation and the relative density both affect the reinforced sample compressibility with high-concentration reaction solutions further reducing the calcareous sand compressibility.
Key wordscalcareous sands    microbially induced carbonate precipitation (MICP)    compressive property    particle size distribution    relative density    reaction solution
收稿日期: 2019-02-13      出版日期: 2019-08-05
基金资助:国家重点研发计划(2016YFC1402800)
引用本文:   
郭红仙, 李东润, 马瑞男, 程晓辉. MICP拌和固化钙质砂一维固结试验[J]. 清华大学学报(自然科学版), 2019, 59(8): 593-600.
GUO Hongxian, LI Dongrun, MA Ruinan, CHENG Xiaohui. Oedometer test of calcareous sands solidified using the MICP mixing method. Journal of Tsinghua University(Science and Technology), 2019, 59(8): 593-600.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.21.018  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I8/593
  图1 钙质砂和石英砂固结曲线比较
  表1 已有钙质砂固结压缩试验汇总
  图2 砂样1粒径级配曲线
  表2 试验分组方案
  表3 有效试样的测试结果
  图3 相对密度不同时试样的e-lgp 曲线
  图4 相对密度对试样侧限模量和压缩指数的影响
  图5 反应液浓度不同时试样e-lgp 曲线
  图6 反应液浓度对试样侧限模量和压缩指数的影响
  图7 粒径级配不同时试样e-lgp 曲线
  图8 钙质砂微生物固化前后固结曲线的变化
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