路基填料室内振动压实及沉降变形研究

发布时间：2018-01-10 12:06

本文关键词：路基填料室内振动压实及沉降变形研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：路基是路面结构的基础，坚固而又稳定的路基为路面结构长期承受行车荷载以及环境影响提供了重要保证。因此，路基必须具有足够的承载能力和稳定性。工程实践中，压实作为物理加固路基土体最为常用和经济的措施，对路基承载能力和稳定性具有非同寻常的意义，也是路基施工过程的关键环节。路基压实方法多种多样，而振动压实己成为压实路基最常用的方式。振动压实作业过程中，被压实材料与振动压路机之间的作用模式及效应是动态的和复杂的，应该将振动压路机和被压实材料作为有机系统来研究。路基振动压实效果不仅与路基填料自身特性密不可分，而且与振动压路机工作参数息息相关。选择工程性质特殊和压实困难的细粒土高液限粘土以及路基常用填料砂类土和土石混填材料，调节改变室内振动压实仪工作参数和路基填料含水率，系统地研究振动频率、静面压力、激振力和含水率对振动压实干密度和回弹模量的影响规律。试验结果表明，这些参数可以明显影响振动压实干密度和回弹模量，并且不同路基填料变化规律不尽相同。在此基础上进一步研究不同压实度条件下高液限粘土、砂类土和土石混填材料力学性质及其路基沉降量，，可见提高压实度，其力学性质有所提高，稳定性明显改善。
[Abstract]:The subgrade is the foundation of pavement structure and subgrade rigid and stable pavement structure under long-term traffic load and environmental impact provides an important guarantee. Therefore, subgrade must have enough bearing capacity and stability. In engineering practice, as the most commonly used reinforcement compaction physical and economic measures for subgrade soil, has an extraordinary significance for subgrade bearing ability and stability, but also the key to the process of subgrade construction. Method of subgrade compaction is varied, and vibration compaction has become the most commonly used way of compacted subgrade. The vibration compaction process, action mode and effect of compacted material and vibroll between is dynamic and complex, and should be vibroll compacted materials as an organic system to study. The vibration compaction effect not only with the characteristics of subgrade are inseparable, and the road and mechanic vibration It is closely related to the parameters.
Choose the special engineering properties and difficult compaction of fine grained soil of high liquid limit clay and subgrade fillers of sand soil and rock soil filled materials, adjust indoor vibrating compaction instrument parameters and subgrade moisture content, systematic study of vibration frequency, static pressure, vibration force and water content on dry density and vibration compaction the influence of modulus of resilience. The experimental results show that these parameters can significantly influence the vibration compacting dry density and modulus, and variation of different filler subgrade is different. On the basis of further research of high liquid limit clay under different degree of compaction, sand soil and rock soil filled subgrade settlement properties and mechanics of materials, visible to improve the degree of compaction, the mechanical properties improved obviously improved stability.

【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】：U416.1;U414

【参考文献】