【作者】 邸俊峰；

【导师】 杨人凤；

【作者基本信息】 长安大学 ， 机械设计及理论， 2009， 硕士

【摘要】 黄土在我国华北、西北地区分布广泛,是这些地区公路路基填筑的主要材料。然而黄土是一种特殊土,孔隙发育,具有湿陷性,遇水会使土基沉陷,从而使路面产生破坏,若对其进行特殊处理又会大大增加工程开支。研究黄土的压实特性,采用正确的压实方法及压实工艺是提高黄土路基承载能力和抗变形能力经济而有效的措施。本文从黄土物理力学性质入手,对黄土颗粒组成及液塑限进行了研究,通过重型击实试验得到了黄土击实曲线,确定了黄土最佳含水量及最大干密度。利用冲击振动复合压路机模型对黄土进行了实验室压实试验。研究了黄土在冲击+静碾、冲击+振动+静碾、振动+静碾三种工况下的压实特性,对比分析了三种工况下压实度变化规律,并对黄土冲击振动压实机理进行了分析。试验过程中利用压力传感器采集黄土中的动态压力信号,对其进行处理与分析,揭示了冲击振动作用在黄土中的传播规律。这些研究为解决黄土压实这一难题提供了理论基础。最后对冲击振动复合压实设备的激振机构进行了参数化设计,为今后该设备的产品化、系列化提供了一条方便快捷的途径。更多还原

【Abstract】 The loess is widely distributed in North and Northwest China, which is the main material of highway subgrade filling in these areas. However, loess is a special soil with the features of porosity development and collapsibility, which will let soil sink with water so that the road will be damaged. It will be greatly increased expenditure if the loess being treated specially. The research of the loess compaction characteristics and using the correct method of compaction and compaction process are main measures to improve the bearing capacity and anti-deformation ability of the loess roadbed.Beginning with the physical property of loess, this article studies the pellet form liquid limit and limit plastic of the loess. According to the heavy compact experiment, the paper gets the compaction curve of the loess and then confirms optimum moisture content and biggest dry density of the loess. Using the model of production-impaction and vibration roller model,the paper do the compact experiment of the loess in the laboratory. The compaction characteristic of the loess is studied through three condition that are impact adds vibratory compaction、static compaction adds impact and vibratory compaction, impact adds vibratory compaction. The distributing and transferring regulation of the degree of compaction is analyzed under three condition and the compaction theory in the impaction-vibration is researched. In the experiment, some pressure sensors are used to collect the dynamic pressure signal, which is processed and analyzed to reveal the distributing and transferring regulation in theimpaction-vibration. Researches in this paper provide the basic theory to solve the difficult problem of compaction of the loess.Finally, this paper design parameters for the impaction and vibration composite compact technology equipment which provide a convenient and efficient way for the production and series of the equipment.更多还原