【作者】 李洁；

【导师】 梁鸿；

【作者基本信息】 内蒙古农业大学 ， 森林工程， 2015， 硕士

【摘要】 随着社会及经济的发展,重载交通越来越受到重视,提高路基质量是重载交通发展的首要任务。随着冲击压路机的兴起,使用冲击压路机对路基进行补强加固受到广泛重视。准池铁路是I级重载铁路,本文依托“冲击压实黄土路基的机理与质量控制研究”课题,对准池重载铁路黄土路基冲击碾压的有效影响深度进行分析研究。论文主要的研究内容为：1.将冲击荷载简化为三角形荷载,使用改进的Scott公式,进行冲击作用下黄土路基的竖向位移计算,分析得到有效影响深度与冲击遍数有关；使用附加应力计算得到冲击过程黄土路基的应力值,分析计算结果得到有效影响深度在2m左右。2.利用有限元软件ABAQUS对冲击碾压黄土路基进行模拟,通过对模拟结果应力值与位移值的分析,得到了有效影响深度为1.8m的结论。3.现场通过土压力传感器埋设试验、位移监测试验和钻芯取样试验进行验证,得到冲击碾压之后黄土路基不同深度的压力值、位移量和压实度,分析得：有效影响深度为2m。综合分析,针对准池重载铁路ZCZQ-4标段的黄土路基修筑中,冲击碾压作用的有效影响深度为2m。更多还原

【Abstract】 With the development of society and economy, more attention is paid to the heavy haul railway; subgrade’s quality improvement is the top priority of the heavy haul railway’s development. With the rise of the impact roller, using impact roller to reinforce the subgrade is widely paid attention to. Zhunchi railway is class-I heavy haul railway, this paper is based on the subject of "Study on mechanism and quality controlling about impact compaction of loess subgrade", studying the effective influence depth of the Zhunchi heavy haul railway’s loess subgrade under impact compaction.This paper’s main research contents are as follows:1. The impact load is simplified to triangle load, the vertical displacement of the loess subgrade under impact is calculated with improved Scott formula, and thus getting that the effective influence depth is related to impact times. Using the additional stress to calculate, it gets the stress of loess subgrade under impact process, after analyzing the calculation results, it is found that the effective influence depth at about 2 m.2. Simulated impact compacted loess roadbed using the finite element software ABAQUS, through the analysis of simulating stress and displacement results, it obtains that the effective influence depth was 1.8 m.3. In the field, through the soil pressure sensors embedding test, displacement monitoring test and drill core sampling test, the loess subgrade’s pressure value, displacement and compaction of different depth after impact compaction are obtained. After the analysis, it is found that the effective influence depth was 2 meters.After comprehensive analysis, in view of the ZCZQ-4 section’s loess subgrade construction of Zhunchi heavy haul railway’, the effective influence depth of impact compaction is 2m.更多还原