本文選題：黃土地層　切入點：黃土路基　出處：《長安大學(xué)》2014年碩士論文

【摘要】：路基是路面的基礎(chǔ)，它承載著自身重力以及上部荷載，其強度及穩(wěn)定性與整個道路的使用壽命相關(guān)。在中國西北地區(qū)黃土分布廣泛，黃土被歸類于特殊土，其工程性質(zhì)也比較特殊。黃土孔隙發(fā)育，濕陷性強，遇水易產(chǎn)生不均勻沉降，部分黃土具有濕陷性，這些性質(zhì)對公路路基影響很大。 作為路基選擇填料的依據(jù)，CBR不可避免的要與黃土聯(lián)系在一起。雖然黃土路基的CBR值在規(guī)范中有規(guī)定，但由于黃土地層復(fù)雜，每個黃土層的CBR值又不盡相同，因此對各個地層黃土CBR值的研究十分有必要。 首先，本文將以黃土的CBR試驗為核心，所用材料選用甘肅西峰孔家塬黃土剖面進行研究。先將孔家塬剖面地層細(xì)分為67小層，對每一小層黃土分別做CBR試驗，然后將試驗結(jié)果匯總，，分析CBR值分布，并得出規(guī)律。 其次，根據(jù)土的三相比例指標(biāo)的定義，換算出甘肅孔家塬剖面各個黃土地層的三相比例指標(biāo)，并得出各指標(biāo)與地層深度的關(guān)系。 最后，將孔家塬黃土地層剖面的CBR值與洛川黃土地層剖面的CBR值相比較，找出規(guī)律。分析了形成這一規(guī)律的原因，研究成果對黃土地區(qū)的高等級公路建設(shè)具有指導(dǎo)作用。
[Abstract]:Subgrade is the foundation of pavement, it bears its own gravity and upper load, and its strength and stability are related to the service life of the whole road.Loess is widely distributed in northwest China, loess is classified as special soil, and its engineering properties are also special.The porosity of loess is developed, the collapsibility is strong, the uneven settlement is easy to occur when the water is encountered, and some loess have collapsibility, these properties have a great influence on the roadbed of highway.As the basis of selecting filling for subgrade, CBR is inevitably associated with loess.Although the CBR value of loess roadbed is stipulated in the code, because of the complexity of loess layer and the different CBR value of each loess layer, it is necessary to study the CBR value of loess in each stratum.Firstly, the CBR test of loess is taken as the core, and the loess section of Xifeng Kongjia tableland in Gansu Province is selected for study.The strata of Kongjiayuan section are subdivided into 67 layers, and each layer loess is tested by CBR test, then the test results are summarized, the distribution of CBR value is analyzed, and the rule is obtained.Secondly, according to the definition of soil three-phase ratio index, the three-phase ratio index of each loess layer in Kongjiayuan section of Gansu Province is converted, and the relationship between each index and formation depth is obtained.Finally, the CBR value of the loess layer section in Kongjia Plateau is compared with the CBR value of the loess layer section in Luochuan, and the regularity is found out.This paper analyzes the reasons for the formation of this law, and the research results can guide the construction of high-grade highway in loess area.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

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