干濕循環(huán)作用下紅粘土脹縮變形特性及裂縫擴展規(guī)律研究
發(fā)布時間：2018-07-20 16:12
【摘要】：由于紅粘土具有高含水率、高塑性、高孔隙比等特殊的工程性質,在干濕循環(huán)作用和反復的交通荷載作用下紅粘土路基的長期強度和穩(wěn)定性下降,使得路基產生了一些病害。論文針對紅粘土路基病害的現象,以余慶至凱里高速公路路基填料為研究對象,以土質學土力學為理論基礎,以巖土工程測試技術和圖像處理技術為手段,采用文獻檢索、現場取樣、理論分析、室內外試驗的方法,研究了紅粘土在干濕循環(huán)作用下脹縮變形特性及裂縫擴展規(guī)律,取得了以下幾點成果:1.得出了紅粘土的基本物理指標和壓實特性;2.得出了在1060C和340C,壓實紅粘土含水率、收縮量隨烘干時間的變化規(guī)律;3.得出了在340C,壓實紅紅粘土膨脹變形規(guī)律;4.在1060C和340C,通過干濕循環(huán)試驗,得出了壓實紅粘土脹縮變形規(guī)律;5.在1060C,通過對立方體和圓柱體試樣的收縮試驗,得出了裂縫的變化規(guī)律;6.通過干濕循環(huán)試驗,以圖像處理技術為手段,得出了裂隙率與循環(huán)次數之間的關系;7.通過室內模型試驗,在340C條件下進行干濕循環(huán),得出了裂縫擴展規(guī)律與干濕循環(huán)次數之間的關系。揭示了紅粘土在1060C和340C條件下脹縮變形特性及裂縫擴展規(guī)律。研究成果對紅粘土路用性能評價體系的完善具有重要的學術價值,對紅粘土地區(qū)的公路建設具有一定工程實際意義,并為其他行業(yè)提供技術借鑒。
[Abstract]:Due to the special engineering properties of red clay, such as high moisture content, high plasticity and high void ratio, the long-term strength and stability of red clay roadbed decreases under the action of dry and wet circulation and repeated traffic loads, which results in some diseases of the roadbed. Aiming at the phenomenon of red clay roadbed disease, this paper takes the embankment filler of Yuqing to Kaili expressway as the research object, takes the soil mechanics as the theoretical foundation, takes the geotechnical engineering test technology and the image processing technology as the means, adopts the literature retrieval. Field sampling, theoretical analysis and indoor and outdoor test methods are used to study the dilatation and shrinkage deformation characteristics and crack propagation of red clay under dry-wet cycle. The following results are obtained: 1. The basic physical indexes and compaction characteristics of red clay are obtained. The variation of moisture content and shrinkage of compacted red clay with drying time is obtained at 1060C and 340C. The expansion and deformation law of compacted red clay at 340 C is obtained. At 1060C and 340C, the expansion and shrinkage deformation law of compacted red clay is obtained by dry and wet cycle test. At 1060C, through the shrinkage test of cube and cylinder specimen, the variation rule of crack is obtained. The relationship between fracture rate and cycle times is obtained by means of image processing technology through dry and wet cycle test. The relationship between the crack propagation law and the number of dry-wet cycles was obtained through laboratory model tests under 340 C condition. The characteristics of dilatation and shrinkage deformation and crack propagation of red clay at 1060C and 340C are revealed. The research results are of great academic value to the improvement of the evaluation system of the road performance of red clay, and of practical engineering significance to the highway construction in the red clay area, and provide technical reference for other industries.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.16;U412.22
本文編號：2134061
[Abstract]:Due to the special engineering properties of red clay, such as high moisture content, high plasticity and high void ratio, the long-term strength and stability of red clay roadbed decreases under the action of dry and wet circulation and repeated traffic loads, which results in some diseases of the roadbed. Aiming at the phenomenon of red clay roadbed disease, this paper takes the embankment filler of Yuqing to Kaili expressway as the research object, takes the soil mechanics as the theoretical foundation, takes the geotechnical engineering test technology and the image processing technology as the means, adopts the literature retrieval. Field sampling, theoretical analysis and indoor and outdoor test methods are used to study the dilatation and shrinkage deformation characteristics and crack propagation of red clay under dry-wet cycle. The following results are obtained: 1. The basic physical indexes and compaction characteristics of red clay are obtained. The variation of moisture content and shrinkage of compacted red clay with drying time is obtained at 1060C and 340C. The expansion and deformation law of compacted red clay at 340 C is obtained. At 1060C and 340C, the expansion and shrinkage deformation law of compacted red clay is obtained by dry and wet cycle test. At 1060C, through the shrinkage test of cube and cylinder specimen, the variation rule of crack is obtained. The relationship between fracture rate and cycle times is obtained by means of image processing technology through dry and wet cycle test. The relationship between the crack propagation law and the number of dry-wet cycles was obtained through laboratory model tests under 340 C condition. The characteristics of dilatation and shrinkage deformation and crack propagation of red clay at 1060C and 340C are revealed. The research results are of great academic value to the improvement of the evaluation system of the road performance of red clay, and of practical engineering significance to the highway construction in the red clay area, and provide technical reference for other industries.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.16;U412.22
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