[1]赵志峰,彭邦阳,邵光辉.胶结液参数对微生物加固粉土的影响[J].东南大学学报(自然科学版),2021,51(3):456-462.[doi:10.3969/j.issn.1001-0505.2021.03.014]
 Zhao Zhifeng,Peng Bangyang,Shao Guanghui.Effects of cementation solution parameters on reinforcing silt by bio-cementation[J].Journal of Southeast University (Natural Science Edition),2021,51(3):456-462.[doi:10.3969/j.issn.1001-0505.2021.03.014]
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胶结液参数对微生物加固粉土的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
51
期数:
2021年第3期
页码:
456-462
栏目:
土木工程
出版日期:
2021-05-20

文章信息/Info

Title:
Effects of cementation solution parameters on reinforcing silt by bio-cementation
作者:
赵志峰1彭邦阳2邵光辉1
1南京林业大学土木工程学院, 南京 210037; 2江苏省建筑设计研究院, 南京 210019
Author(s):
Zhao Zhifeng1 Peng Bangyang2 Shao Guanghui1
1College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
2Jiangsu Provincial Architectural Design and Research Institute, Nanjing 210019, China
关键词:
微生物胶结 海相粉土 胶结液浓度 胶结液配比
Keywords:
bio-cementation marine silt concentration of cementation solution ratio of cementation solution
分类号:
TU472.4
DOI:
10.3969/j.issn.1001-0505.2021.03.014
摘要:
胶结液对微生物土体加固具有重要作用,以海相粉土为处理对象,选用巴氏芽孢杆菌作为微生物、尿素和氯化钙作为胶结液,研究胶结液参数对加固效果的影响.采用将菌液与粉土拌合制样,然后入渗多轮胶结液的方法对试样进行有效加固.通过试验研究了浓度、轮数、配比、体积等胶结液参数对加固效果的影响.结果表明:当胶结液浓度不低于0.50 mol/L时,试样水稳定性较好;试样中沉积的CaCO3数量和无侧限抗压强度随着胶结液相对用量增加而提高,但当胶结液浓度为1.50 mol/L时,CaCO3均匀性和无侧限抗压强度都有明显下降;增加胶结液中尿素的比例对加固效果的影响很小;减小每轮胶结液入渗体积会使加固的整体性明显下降,因此每轮胶结液的体积不应低于孔隙体积.试验和SEM结果表明,胶结液浓度会影响CaCO3分布和晶体大小,从而影响加固强度.
Abstract:
Cementation solution has a great effect on soil reinforcement with microorganism. Taking marine silt as treatment soil, Sporosarcina pasteurii as microorganism, urea and calcium chloride as cementation solution, the effects of cementation solution parameters on the reinforcement were studied. The sample was effectively reinforced by premixing bacteria with soil followed by cementation solution percolation repeatedly. The effects of several parameters of cementation solution such as concentration, number of treatments, ratio and volume were studied through experiments. The results indicate that soil samples are stable in water when the concentration of the cementation solution is no less than 0.50 mol/L. The amount of precipitated CaCO3 and unconfined compression strength increase with the amount of the cementation solution. When the concentration reaches 1.50 mol/L, CaCO3 homogeneity and the peak strength decrease remarkably. Increasing the urea ratio in the cementation solution will bring no significant improvement to reinforcement. The reduction of the cementation solution volume of each treatment will worsen reinforcement, and then the volume should be not less than the volume of void. Results of experiments and SEM images indicate that the concentration of the cementation solution has a direct effect on the CaCO3 distribution and crystal size, thus affecting reinforcement strength.

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备注/Memo

备注/Memo:
收稿日期: 2020-10-29.
作者简介: 赵志峰(1978—),男,博士,副教授;邵光辉(联系人),男,博士,教授,博士生导师,gh_shao@njfu.edu.cn.
基金项目: 国家自然科学基金资助项目(51578293,51809139).
引用本文: 赵志峰,彭邦阳,邵光辉.胶结液参数对微生物加固粉土的影响[J].东南大学学报(自然科学版),2021,51(3):456-462. DOI:10.3969/j.issn.1001-0505.2021.03.014.
更新日期/Last Update: 2021-05-20