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

【摘要】：我國在黃土地區(qū)范圍內(nèi)的工程項目不斷增多，同時建設(shè)深度不斷加大。由于黃土自身性質(zhì)的原因，造成實體工程項目中出現(xiàn)較多的病害，，表現(xiàn)為路基的強度穩(wěn)定性方面的問題居多。對黃土進行沿深度方向的相關(guān)性質(zhì)研究成為客觀的迫切需要。 黃土是一種第四紀堆積物，在典型剖面上表現(xiàn)為黃土—古土壤地層交替出現(xiàn)，被廣泛應(yīng)用于路基填料。加州承載比是選擇填料及工程設(shè)計中的一項重要指標(biāo)，表征土體的抵抗局部變形的能力。 本文經(jīng)過現(xiàn)場調(diào)研，選定洛川石家莊黃土典型剖面，并以地層單元為劃分依據(jù)進行取樣，并進行相關(guān)試驗研究。 對剖面地層進行細致描述，宏觀上總結(jié)了各個地層的物理狀態(tài)特征；對試樣進行物理指標(biāo)試驗，得到干密度沿剖面深度向下有增大趨勢，而孔隙比有減小的趨勢，并得到各個物理指標(biāo)沿著剖面深度方向的變化規(guī)律，總結(jié)了其變化特征。 對各地層采用加州承載比試驗來研究分析其工程性質(zhì)，探尋沿著剖面方向上CBR值的的變形規(guī)律及特征，對試驗數(shù)據(jù)進行科學(xué)分析，并繪制柱狀示意圖，得到其數(shù)值在深度方向呈總體變大的趨勢及相關(guān)結(jié)論。同時與甘肅西峰剖面CBR數(shù)據(jù)對比分析，總結(jié)了兩個區(qū)域之間的異同。 通過試驗研究壓實度和試件飽水時間對加州承載比試驗的影響特點，并得到相關(guān)結(jié)論。
[Abstract]:The growing in the loess area within the scope of the project, while construction depth increasing. Due to the nature of the disease entity caused more appear in the project performance for the strength and stability problems of loess subgrade. Mostly research related properties along the depth direction become an urgent demand.
Loess is a Quaternary deposit. In typical section, it appears as an alternation of loess paleosol. It is widely applied to roadbed fill. California bearing ratio is an important index in selecting filler and engineering design, which represents the ability of soil to resist partial deformation.
In this paper, after field investigation, the typical section of Luochuan Shijiazhuang loess is selected, and the stratigraphic unit is taken as the basis for sampling, and the related experiments are carried out.
A detailed description of the profile, summarizes the characteristics of macro physical state of each stratum; physical test index of the sample obtained dry density increases along the depth downward, and the void ratio decreases, and the variation of the physical indexes of each section along the depth direction, and summarizes its characteristics.
For all the studied layer using the ratio test of the engineering properties of California bearing, to explore the rules and characteristics of deformation along the profile direction of CBR value, the scientific analysis of the test data, and draw the column diagram, the data are overall larger trend and relevant conclusions in the depth direction. At the same time, the analysis and comparison of data section CBR Gansu Xifeng, summarizes the similarities and differences between the two regions.
The influence of the compaction degree and the filling time of the specimen on the California bearing ratio test is studied and the relevant conclusions are obtained.

【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】：U412.22

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相關(guān)期刊論文 前6條

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本文編號：1724576