[1]杨宇烨,赵志峰*.胶结液浓度对微生物注浆加固海相粉土的影响[J].林业工程学报,2019,4(04):143-147.[doi:10.13360/j.issn.2096-1359.2019.04.021]
 YANG Yuye,ZHAO Zhifeng*.Study on the influence of cementation solution concentration on reinforcement of marine silt by microbial grouting[J].Journal of Forestry Engineering,2019,4(04):143-147.[doi:10.13360/j.issn.2096-1359.2019.04.021]
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胶结液浓度对微生物注浆加固海相粉土的影响()
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《林业工程学报》[ISSN:1001-8081/CN:32-1160/S]

卷:
4
期数:
2019年04期
页码:
143-147
栏目:
森林工程与土建
出版日期:
2019-07-09

文章信息/Info

Title:
Study on the influence of cementation solution concentration on reinforcement of marine silt by microbial grouting
文章编号:
2096-1359(2019)04-0143-05
作者:
杨宇烨赵志峰*
南京林业大学土木工程学院,南京 210037
Author(s):
YANG Yuye ZHAO Zhifeng*
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
关键词:
微生物诱导碳酸钙沉积 海相粉土 胶结液浓度 注浆效果
Keywords:
microbial induced calcite precipitation marine silt cementation solution concentration grouting effect
分类号:
TU433
DOI:
10.13360/j.issn.2096-1359.2019.04.021
文献标志码:
A
摘要:
利用微生物诱导碳酸钙沉积来胶结加固土体是当前岩土领域的研究热点。根据已有研究,胶结液浓度对微生物注浆效果有显著影响,但目前对粉土的研究较少。以海相粉土为处理对象,通过一组室内试验来分析胶结液浓度对加固效果的影响。采用多轮注浆的方法进行加固,即首轮注入菌液,然后根据需要注入不同轮数和浓度的胶结液。试验结果表明:在仅注入一轮胶结液时,碳酸钙沉积效率随着胶结液浓度的提高而下降,浓度为0.5 mol/L时的沉积效率最高。当注入多轮胶结液时,试样中沉积生成的碳酸钙比较均匀。随着胶结液注入轮数的增加,采用较低浓度胶结液加固的试样具有更高的碳酸钙沉积效率。在使用同等数量胶结液物质的条件下,低浓度处理后试样的无侧限抗压强度更高。因此对于用微生物注浆方法处理海相粉土,当采用多轮注入胶结液进行加固时,应选择合适的胶结液浓度。
Abstract:
Application of a new environmentally friendly technique, namely microbial induced calcite precipitation in soil improvement, is gaining increased attention in geotechnical engineering field.According to existing studies, the concentration of cementation solution has a significant influence on the improvement effect of microbial grouting.However, the influence of cementation solution concentration on reinforcement of marine silt is not clear.The objective of present study is to assess this influence on grouted marine silt via a series of laboratory tests.The grouting method, including the first round injection with bacterial solution and then followed by multi rounds of cementation solution of various concentrations, is adopted to reinforce the soil samples.The experiment results showed that in the case of one-round grouting, the calcium carbonate precipitation rate was decreased with the increase in concentration of cementation solution.Also, the precipitation rate reaches its maximum value when the concentration of cementation solution was 0.5 mol/L.In the cases of multi-round grouting of cementation solution, the distribution of precipitated calcium carbonate was almost uniform in the whole height of treated sample which verified the effectiveness of adopted microbial grouting method.In addition, as the in grouting round was increased, the sample treated by the cementation solution with low concentration show a higher efficiency of calcium carbonate precipitation.Moreover, the unconfined compressive strengths of samples treated by the cementation solution with different concentrations were different at the same amount of calcium ions in cementation solution.In general, the samples treated by the cementation solution with low concentrations exhibited higher strengths than those treated by the cementation solution with high concentrations.According to test results of calcium carbonate precipitation and unconfined compressive strength of treated samples, it was concluded that the suitable concentration of cementation solution should be selected when the multi grouting method of microbial induced calcite precipitation is adopted to reinforce marine silt.

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相似文献/References:

[1]孔繁浩,赵志峰*.溶液环境下微生物诱导碳酸钙沉积影响因素研究[J].林业工程学报,2017,2(04):146.[doi:10.13360/j.issn.2096-1359.2017.04.023]
 KONG Fanhao,ZHAO Zhifeng*.Study on influencing factors of microbial induced calcite precipitation insolution environment[J].Journal of Forestry Engineering,2017,2(04):146.[doi:10.13360/j.issn.2096-1359.2017.04.023]
[2]彭邦阳,赵志峰*.表面入渗法诱导碳酸钙沉积加固海相粉土研究[J].林业工程学报,2018,3(05):136.[doi:10.13360/j.issn.2096-1359.2018.05.021]
 PENG Bangyang,ZHAO Zhifeng*.Improvement of marine silt by microbial induced calcite precipitation by surface percolation[J].Journal of Forestry Engineering,2018,3(04):136.[doi:10.13360/j.issn.2096-1359.2018.05.021]

备注/Memo

备注/Memo:
收稿日期:2018-12-07 修回日期:2019-02-25
基金项目:国家自然科学基金(51578293)。
作者简介:杨宇烨,男,研究方向为环境岩土与地下工程。通信作者:赵志峰,男,副教授。E-mail:zzf0911@163.com
更新日期/Last Update: 2019-07-10