本文選題：紅層泥巖 + 分布��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著近年來,西南地區(qū)基礎(chǔ)設(shè)施建設(shè)的大力開展,紅層區(qū)泥巖誘發(fā)的自然災(zāi)害在實際工程建設(shè)中引起了建設(shè)者們廣泛的關(guān)注。紅層泥巖具有保水性強,抗風(fēng)化能力弱,遇水后巖體易膨脹且結(jié)構(gòu)面抗剪強度大幅度下降,失水后又產(chǎn)生收縮、崩解等工程特性,再加上紅層區(qū)泥巖分布廣泛,因此,以紅層泥巖的分布規(guī)律為切入點,對泥巖的工程特性及其微觀機理進行研究具有較強的現(xiàn)實意義。本文主要通過對龍泉山地區(qū)的野外調(diào)查及室內(nèi)試驗,對該地區(qū)紅層泥巖的分布,膨脹性、抗剪強度等工程參數(shù)與微結(jié)構(gòu)的相關(guān)性進行了分析,得出以下成果:1.通過閱讀大量的文獻及相關(guān)的地質(zhì)資料,對龍泉山地區(qū)主要地層分布,巖性、水文、各地層含泥巖的巖組數(shù)量及泥巖所占百分含量進行了統(tǒng)計分析,認為該地區(qū)主要地層分布為侏羅系和白堊系,巖性大都為泥巖、砂巖、粉砂巖等,且侏羅系含泥巖巖組的數(shù)量要多于白堊系。2.五組泥巖重塑土的室內(nèi)直剪及膨脹率試驗數(shù)據(jù)表明,對于侏羅系及白堊系地層中的泥巖皆存在膨脹性,其中,灌口組泥巖和上沙溪廟組紫色泥巖膨脹性較強;而抗剪強度參數(shù)c、ψ值,隨含水率的變化,均呈現(xiàn)規(guī)律性變化。隨含水率的增大,黏聚力c值先增大后減小,即存在一個最優(yōu)含水率值,經(jīng)測得,該值位于試樣塑限值附近。內(nèi)摩擦角ψ值,隨含水率的增大,呈非線性的降低。3.礦物成分及Fe_2O_3的量與試樣的抗剪強度均存在一定的相關(guān)性。當富含黏土礦物的泥巖試樣中,蒙脫石的含量達到一定值時,此時該試樣主要體現(xiàn)蒙脫石的工程特性;同時Fe_2O_3含量的變化,對含蒙脫石礦物試樣的黏聚力值增長顯著,對內(nèi)摩擦角值減小同樣顯著,最終隨著Fe_2O_3含量的增大,抗剪強度參數(shù)值均趨于平緩。4.微結(jié)構(gòu)的結(jié)構(gòu)類型,孔隙數(shù)量、顆粒排列的密集及定向程度、結(jié)構(gòu)連接力的強弱均對抗剪強度及膨脹勢的大小產(chǎn)生影響。其中,片狀體形成的片狀結(jié)構(gòu)、面-面疊聚體的密集定向排列、較弱的結(jié)構(gòu)連接形式是導(dǎo)致膨脹勢較高的一個關(guān)鍵因素。而孔隙數(shù)量較多的,在含水率較低時,抗剪性能較差。
[Abstract]:With the development of infrastructure construction in Southwest China in recent years, the natural disasters induced by mudstone in the red bed area have aroused widespread concern of the constructors in practical engineering construction.Red mudstone has engineering characteristics such as strong water retention, weak weathering resistance, easy expansion of rock mass after water treatment, large decrease in shear strength of structural plane, shrinkage and disintegration after losing water, and the mudstone in red bed area is widely distributed, therefore,It is of great practical significance to study the engineering characteristics and microscopic mechanism of mudstone from the point of view of the distribution law of red mudstone.Based on field investigation and laboratory test in Longquanshan area, the correlation between engineering parameters such as distribution, expansion, shear strength and microstructure of red mudstone in this area is analyzed in this paper, and the following results are obtained: 1.By reading a large number of documents and related geological data, the distribution, lithology, hydrology, the number of mudstone formations and the percentage of mudstone in the Longquanshan area are analyzed statistically.It is considered that the main strata in this area are Jurassic and Cretaceous, and the lithology is mostly mudstone, sandstone, siltstone and so on, and the number of Jurassic mudstone formation is more than Cretaceous. 2.Five groups of mudstone remolded soil are tested by direct shear and expansion test. The results show that there is swelling of mudstone in Jurassic and Cretaceous strata, among which mudstone of Guankou formation and purple mudstone of Upper Shaximiao formation have strong expansibility.However, the shear strength parameters c and 蠄 change regularly with the change of moisture content.With the increase of moisture content, the cohesion C value first increases and then decreases, that is, there exists an optimal moisture content value, which is located near the plastic limit value of the sample.The angle 蠄 of internal friction decreases with the increase of moisture content.There is a certain correlation between the mineral composition and the amount of Fe_2O_3 and the shear strength of the sample.When the content of montmorillonite reaches a certain value in the mudstone sample rich in clay minerals, the sample mainly embodies the engineering characteristics of montmorillonite, and the change of Fe_2O_3 content increases the cohesion value of montmorillonite mineral sample significantly.The value of internal friction angle decreased significantly, and finally, with the increase of Fe_2O_3 content, the shear strength parameters tended to be flat. 4.The structural types, the number of pores, the density and orientation of particle arrangement, and the strength of structural connection force all affect the shear strength and expansion potential.One of the key factors leading to the higher expansion potential is the flake structure formed by the flake, the dense and directional arrangement of the facial-plane superpolymer, and the weak structural connection form.However, when the water content is low, the shearing property is poor when the number of pores is more.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU452

【參考文獻】

相關(guān)期刊論文 前10條

1 諶文武;林高潮;劉偉;吳瑋江;伏祥龍;彭虹智;趙佩;;全風(fēng)化灰綠色及紅色泥巖物理力學(xué)性質(zhì)對比研究[J];巖石力學(xué)與工程學(xué)報;2016年12期

2 閻瑞敏;桂蕾;;滑帶土抗剪強度與其礦物成分典型相關(guān)性分析[J];人民長江;2016年08期

3 邱恩喜;康景文;鄭立寧;郭永春;賀建軍;;成都地區(qū)含膏紅層軟巖溶蝕特性研究[J];巖土力學(xué);2015年S2期

4 上官力;馬顯春;谷明成;;四川攀西地區(qū)紅層泥巖強度特性試驗研究[J];鐵道建筑;2015年07期

5 張云杰;樊成;劉小紅;徐濤;;重慶地區(qū)不同地質(zhì)年代泥巖膨脹特性試驗研究[J];有色金屬(礦山部分);2014年04期

6 于春江;陳發(fā)根;謝添;;泥巖路基填料膨脹工程特性研究[J];公路交通科技(應(yīng)用技術(shù)版);2013年12期

7 李永豪;趙許川;劉靜濤;王建慶;潘科;;Fe_2O_3和Al_2O_3膠結(jié)作用影響紅粘土抗剪強度試驗研究[J];路基工程;2013年02期

8 帥常娥;石成;彭鵬;;滑帶土中粘粒含量及含水量的變化對其強度影響的試驗研究[J];勘察科學(xué)技術(shù);2012年05期

9 高福華;;四川紅層邊坡滑塌治理[J];交通標準化;2011年22期

10 魏永幸;張仕忠;甘鷹;康景文;高巖川;彭仕明;;四川盆地紅層泥巖的基本特性和膨脹性及軟化的試驗研究[J];工程勘察;2010年S1期

，

本文編號：1769150