隨著中國(guó)經(jīng)濟(jì)的發(fā)展與轉(zhuǎn)型,我國(guó)的工程建設(shè)開始進(jìn)入一個(gè)新的階段。在工程建設(shè)過(guò)程中,不可避免地會(huì)遇到一些不能滿足工程要求的不良土體,必須對(duì)土體進(jìn)行加固處理。然而,目前常用的加固方法是基于物理與化學(xué)手段對(duì)土體進(jìn)行加固,在土體加固過(guò)程中使用的水泥、石膏、石灰等傳統(tǒng)膠凝材料會(huì)侵蝕和污染地下水與周圍植被,此外,水泥、鋼筋的生產(chǎn)也會(huì)產(chǎn)生大量的溫室氣體,這些因素?zé)o疑會(huì)嚴(yán)重阻礙我國(guó)資源節(jié)約型和環(huán)境友好型社會(huì)的建設(shè)和發(fā)展進(jìn)程。因此,研究節(jié)能減排、生態(tài)環(huán)保、經(jīng)濟(jì)高效的新型土體加固方法具有顯著的意義。隨著科學(xué)技術(shù)的進(jìn)步,學(xué)科間交叉在處理一些前沿問題上展現(xiàn)出了強(qiáng)大的優(yōu)勢(shì)。國(guó)內(nèi)外研究人員早已意識(shí)到了傳統(tǒng)土體加固技術(shù)的缺陷與所帶來(lái)的環(huán)境污染問題,開始將生物技術(shù)應(yīng)用于土體加固中。植物根系能夠影響土體中營(yíng)養(yǎng)物質(zhì)的流動(dòng),進(jìn)而改變土體中的生物聚合物含量。生物聚合物通過(guò)與土體的交互作用來(lái)改變土體的結(jié)構(gòu)和工程性質(zhì)。在已有的成果中,絕大多數(shù)研究將土體與根系分離,單獨(dú)進(jìn)行試驗(yàn)研究,對(duì)植物根系/根系分泌物/生物聚合物-土體復(fù)合體作為一個(gè)整體系統(tǒng)進(jìn)行分析的研究成果還十分欠缺。因此,植物根系/根系分泌物/生物聚合物-土體復(fù)合體開展前瞻性... 

【文章來(lái)源】：中國(guó)地質(zhì)大學(xué)湖北省 211工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：142 頁(yè)

【學(xué)位級(jí)別】：博士

【文章目錄】：
作者簡(jiǎn)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


【參考文獻(xiàn)】：
期刊論文
[1]微生物灌漿加固土體研究進(jìn)展[J]. 錢春香,王安輝,王欣.  巖土力學(xué). 2015(06)
[2]植物根系分泌物研究綜述[J]. 張豆豆,梁新華,王俊.  中國(guó)農(nóng)學(xué)通報(bào). 2014(35)



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