生物聚合物对土体强度影响的研究
发布时间：2021-03-06 09:49
随着中国经济的发展与转型,我国的工程建设开始进入一个新的阶段。在工程建设过程中,不可避免地会遇到一些不能满足工程要求的不良土体,必须对土体进行加固处理。然而,目前常用的加固方法是基于物理与化学手段对土体进行加固,在土体加固过程中使用的水泥、石膏、石灰等传统胶凝材料会侵蚀和污染地下水与周围植被,此外,水泥、钢筋的生产也会产生大量的温室气体,这些因素无疑会严重阻碍我国资源节约型和环境友好型社会的建设和发展进程。因此,研究节能减排、生态环保、经济高效的新型土体加固方法具有显著的意义。随着科学技术的进步,学科间交叉在处理一些前沿问题上展现出了强大的优势。国内外研究人员早已意识到了传统土体加固技术的缺陷与所带来的环境污染问题,开始将生物技术应用于土体加固中。植物根系能够影响土体中营养物质的流动,进而改变土体中的生物聚合物含量。生物聚合物通过与土体的交互作用来改变土体的结构和工程性质。在已有的成果中,绝大多数研究将土体与根系分离,单独进行试验研究,对植物根系/根系分泌物/生物聚合物-土体复合体作为一个整体系统进行分析的研究成果还十分欠缺。因此,植物根系/根系分泌物/生物聚合物-土体复合体开展前瞻性...
【文章来源】：中国地质大学湖北省 211工程院校 教育部直属院校
【文章页数】：142 页
【学位级别】：博士
【文章目录】：
作者简介
摘要
abstract
1 Introduction
1.1 Background
1.2 Research object
1.3 Innovation points
1.4 Thesis outline
1.5 Research technical route
2 Literature review
2.1 Introduction
2.2 Traditional soil stabilisation method
2.3 Bio-treatment in the soil
2.3.1 Microbial induced calcium carbonate precipitation（MICP）
2.3.2 MICP soil cementation theory
2.3.3 MICP treated soil property
2.4 Biofilm and extracellular polymeric substance（EPS）in soil
2.4.1 Influence of biofilm on soil hydraulic properties
2.4.2 Impact of biofilm or EPS on soil geomechanical behaviour
2.4.3 The effects of biofilm or EPS in the intertidal zone
2.4.4 EPS in desert crusts
2.5 The property and function of root mucilage in soil
2.5.1 Mucilage function for the seeding and soil interaction
2.5.2 Mucilage function in soil over time
2.5.3 Soil behaviour as a result of mucilage production and extension
2.5.4 Geotechnical performance of artificially added biopolymers
2.6 Comparison of biopolymer effects and their value in geotechnical engineering
2.7 Conclusions
3 Material and method
3.1 Introduction
3.2 Material
3.2.1 Property of soil
3.2.2 Xanthan gum biopolymer
3.2.3 Fibre
3.3 Geotechnical method
3.3.1 Direct shear test
3.3.2 Permeability test
4 Impact of biopolymer gel-coated fibres on reinforcement of sand as a model of plant root behaviour
4.1 Introduction
4.2 Experiment program
4.2.1 Sample preparation
4.2.2 Direct shear strength
4.2.3 Dry soil aggregate tests
4.3 Experimental structure
4.3.1 Effect of straight and branched fibres
4.3.2 Impact of gel on fibre reinforcement of sand
4.3.3 Effect of gel on sand structure with changing moisture conditions
4.3.4 Effect of wetting and drying cycles on fibre/gel/sand composites
4.4 Results and analysis
4.4.1 Effect of fibre content and shape
4.4.2 Xanthan gum gel as a model root mucilage– impact on shear performance of fibre-reinforced sand
4.4.3 Effect of drying on shear performance of fibre/gel/soil composites
4.4.4 Changes in shear strength over wetting and drying cycles
4.4.5 Conclusion
5 Impact of biopolymer in the soil strength as a model of extracellular polymeric substances（EPS）behaviour with biopolymer
5.1 Introduction
5.2 Experiment program
5.2.1 Sample preparation
5.2.2 Direct shear strength
5.2.3 Permeability test
5.3 Results and discussion
5.3.1 Biopolymer effect after drying or wetting
5.3.2 Effect of moisture path on shear performance
5.3.3 Response of shear behaviour to multiple drying and wetting cycles
5.3.4 Permeability of biopolymer treated soil
5.4 Conclusion
6 The curing effect on xanthan gum biopolymer treated sandy soil interaction and shear strength
6.1 Introduction
6.2 Sample preparation and test procedure
6.2.1 Direct shear test
6.2.2 Bonding test
6.2.3 Scanning electron microscope（SEM）
6.3 Experiment structure
6.3.1 Biopolymer effect on soil under different water content after curing
6.3.2 Bonding test of biopolymer under different water content after curing
6.4 Results and discussion
6.4.1 Strength of biopolymer treated soil in the initial state
6.4.2 Variation of biopolymer treated soil strength with different water content after curing
6.4.3 Dry condition
6.4.4 Scanning electron microscope（SEM）
6.4.5 Hypothesis of biopolymer behaviour in the soil
6.4.6 Bonding property of biopolymer
6.5 Conclusion
7 Conclusions
8 Future work
Acknowledgement
Reference
【参考文献】：
期刊论文
[1]微生物灌浆加固土体研究进展[J]. 钱春香,王安辉,王欣. 岩土力学. 2015(06)
[2]植物根系分泌物研究综述[J]. 张豆豆,梁新华,王俊. 中国农学通报. 2014(35)
本文编号：3066879
【文章来源】：中国地质大学湖北省 211工程院校 教育部直属院校
【文章页数】：142 页
【学位级别】：博士
【文章目录】：
作者简介
摘要
abstract
1 Introduction
1.1 Background
1.2 Research object
1.3 Innovation points
1.4 Thesis outline
1.5 Research technical route
2 Literature review
2.1 Introduction
2.2 Traditional soil stabilisation method
2.3 Bio-treatment in the soil
2.3.1 Microbial induced calcium carbonate precipitation（MICP）
2.3.2 MICP soil cementation theory
2.3.3 MICP treated soil property
2.4 Biofilm and extracellular polymeric substance（EPS）in soil
2.4.1 Influence of biofilm on soil hydraulic properties
2.4.2 Impact of biofilm or EPS on soil geomechanical behaviour
2.4.3 The effects of biofilm or EPS in the intertidal zone
2.4.4 EPS in desert crusts
2.5 The property and function of root mucilage in soil
2.5.1 Mucilage function for the seeding and soil interaction
2.5.2 Mucilage function in soil over time
2.5.3 Soil behaviour as a result of mucilage production and extension
2.5.4 Geotechnical performance of artificially added biopolymers
2.6 Comparison of biopolymer effects and their value in geotechnical engineering
2.7 Conclusions
3 Material and method
3.1 Introduction
3.2 Material
3.2.1 Property of soil
3.2.2 Xanthan gum biopolymer
3.2.3 Fibre
3.3 Geotechnical method
3.3.1 Direct shear test
3.3.2 Permeability test
4 Impact of biopolymer gel-coated fibres on reinforcement of sand as a model of plant root behaviour
4.1 Introduction
4.2 Experiment program
4.2.1 Sample preparation
4.2.2 Direct shear strength
4.2.3 Dry soil aggregate tests
4.3 Experimental structure
4.3.1 Effect of straight and branched fibres
4.3.2 Impact of gel on fibre reinforcement of sand
4.3.3 Effect of gel on sand structure with changing moisture conditions
4.3.4 Effect of wetting and drying cycles on fibre/gel/sand composites
4.4 Results and analysis
4.4.1 Effect of fibre content and shape
4.4.2 Xanthan gum gel as a model root mucilage– impact on shear performance of fibre-reinforced sand
4.4.3 Effect of drying on shear performance of fibre/gel/soil composites
4.4.4 Changes in shear strength over wetting and drying cycles
4.4.5 Conclusion
5 Impact of biopolymer in the soil strength as a model of extracellular polymeric substances（EPS）behaviour with biopolymer
5.1 Introduction
5.2 Experiment program
5.2.1 Sample preparation
5.2.2 Direct shear strength
5.2.3 Permeability test
5.3 Results and discussion
5.3.1 Biopolymer effect after drying or wetting
5.3.2 Effect of moisture path on shear performance
5.3.3 Response of shear behaviour to multiple drying and wetting cycles
5.3.4 Permeability of biopolymer treated soil
5.4 Conclusion
6 The curing effect on xanthan gum biopolymer treated sandy soil interaction and shear strength
6.1 Introduction
6.2 Sample preparation and test procedure
6.2.1 Direct shear test
6.2.2 Bonding test
6.2.3 Scanning electron microscope（SEM）
6.3 Experiment structure
6.3.1 Biopolymer effect on soil under different water content after curing
6.3.2 Bonding test of biopolymer under different water content after curing
6.4 Results and discussion
6.4.1 Strength of biopolymer treated soil in the initial state
6.4.2 Variation of biopolymer treated soil strength with different water content after curing
6.4.3 Dry condition
6.4.4 Scanning electron microscope（SEM）
6.4.5 Hypothesis of biopolymer behaviour in the soil
6.4.6 Bonding property of biopolymer
6.5 Conclusion
7 Conclusions
8 Future work
Acknowledgement
Reference
【参考文献】：
期刊论文
[1]微生物灌浆加固土体研究进展[J]. 钱春香,王安辉,王欣. 岩土力学. 2015(06)
[2]植物根系分泌物研究综述[J]. 张豆豆,梁新华,王俊. 中国农学通报. 2014(35)
本文编号：3066879
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