洛川黄土剖面地层CBR值分布规律研究

发布时间：2018-04-09 03:11

本文选题：黄土　切入点：路基　出处：《长安大学》2014年硕士论文

【摘要】：我国在黄土地区范围内的工程项目不断增多，同时建设深度不断加大。由于黄土自身性质的原因，造成实体工程项目中出现较多的病害，，表现为路基的强度稳定性方面的问题居多。对黄土进行沿深度方向的相关性质研究成为客观的迫切需要。黄土是一种第四纪堆积物，在典型剖面上表现为黄土—古土壤地层交替出现，被广泛应用于路基填料。加州承载比是选择填料及工程设计中的一项重要指标，表征土体的抵抗局部变形的能力。本文经过现场调研，选定洛川石家庄黄土典型剖面，并以地层单元为划分依据进行取样，并进行相关试验研究。对剖面地层进行细致描述，宏观上总结了各个地层的物理状态特征；对试样进行物理指标试验，得到干密度沿剖面深度向下有增大趋势，而孔隙比有减小的趋势，并得到各个物理指标沿着剖面深度方向的变化规律，总结了其变化特征。对各地层采用加州承载比试验来研究分析其工程性质，探寻沿着剖面方向上CBR值的的变形规律及特征，对试验数据进行科学分析，并绘制柱状示意图，得到其数值在深度方向呈总体变大的趋势及相关结论。同时与甘肃西峰剖面CBR数据对比分析，总结了两个区域之间的异同。通过试验研究压实度和试件饱水时间对加州承载比试验的影响特点，并得到相关结论。
[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.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U412.22

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