干旱荒漠区天然砂砾路基填料压实特性分析

发布时间：2018-05-17 10:33

本文选题：道路工程 + 压实特性　；参考：《中国公路学报》2017年02期

【摘要】：为研究天然砂砾路基填料的振动压实特性,首先采用筛分法对干旱荒漠地区多条在建高速公路的天然砂砾路基填料进行颗粒组成分析,其次进行表面振动压实试验,采用湿土法分析含水量对天然砂砾干密度的影响,采用干土法分析含石量、级配特性和振动时间对天然砂砾压实效果的影响。基于不同粗颗粒组含量下的最大干密度结果,拟合了天然砂砾最大干密度与粗颗粒中各粒组含量之间的关系式,并利用粗颗粒粒组含量确定天然砂砾的最大干密度。研究结果表明:新疆干旱荒漠区天然砂砾路基填料为不均匀土,级配不良的主要原因为曲率系数较小,填料中细粒含量较少;天然砂砾的干密度随着含水量增大会有谷值与峰值,与黏性土的单峰值变化有明显区别;天然砂砾含石量对最大干密度有显著影响,其最大干密度随含石量的变化分为明显的3个阶段,当含石量为60%时,可以得到最大干密度的最大值;不同级配的天然砂砾的干密度对振动时间的敏感性有明显区别。
[Abstract]:In order to study the vibration compaction characteristics of natural sand gravel subgrade filler, the particle composition of natural sand gravel subgrade filler in arid desert area was analyzed by sieving method, and the surface vibration compaction test was carried out. The effect of moisture content on the dry density of natural sand gravel was analyzed by wet soil method, and the effect of rock content, gradation characteristic and vibration time on the compaction effect of natural sand gravel was analyzed by dry soil method. Based on the results of maximum dry density of different coarse grains, the relationship between the maximum dry density of natural sand gravel and the content of each group of coarse grains is fitted, and the maximum dry density of natural sand gravel is determined by the content of coarse grains. The results show that the filling of natural gravel subgrade in arid desert region of Xinjiang is non-uniform soil, the main reason of poor gradation is the small curvature coefficient, and the content of fine particles in the filling is less; The dry density of natural sand gravel has valley value and peak value with the increase of water content, which is obviously different from the single peak value change of clay soil, and the content of natural gravel has significant influence on the maximum dry density. The maximum dry density can be divided into three stages with the change of rock content. When the rock content is 60, the maximum dry density can be obtained, and the sensitivity of dry density of different gradation natural gravel to vibration time is obviously different.
【作者单位】：交通运输部公路科学研究院;清华大学土木工程系;新疆交通建设管理局;北京交通大学土木建筑工程学院;西安市城乡建设委员会;
【基金】：国家自然科学基金项目(51008029,51378071) 新疆交通运输厅科技项目(2010-9) 陕西省自然科学基金项目(2013JQ7030)
【分类号】：U416.166

【相似文献】