| 李勇俊,严颖,赵春发,季顺迎*.细小颗粒对道砟材料剪切性能影响的试验研究[J].实验力学,2020,35(6):985~993 |
| 细小颗粒对道砟材料剪切性能影响的试验研究 |
| Experimental investigation on shear mechanical properties of ballast materials under influence of fine particles |
| 投稿时间：2019-05-18 修订日期：2019-07-13 |
| DOI：10.7520/1001-4888-19-087 |
| 中文关键词: 道砟材料 直剪试验 细小颗粒 剪切性能 |
| 英文关键词:ballast materials direct shear test fine particles shear property |
| 基金项目:国家自然科学基金项目(11572067, 11872136)资助 |
|
| 摘要点击次数: 731 |
| 全文下载次数: 110 |
| 中文摘要: |
| 为研究细小颗粒贯入对铁路道砟材料剪切性能的影响规律，采用大型直剪仪对煤粉和细沙两种典型细小颗粒材料影响下的道砟材料进行了直剪试验，并得到了不同细小颗粒含量下道砟材料的剪切强度。试验结果表明：道砟材料的剪切强度随法向载荷的增大而增大，并随细颗粒含量的升高而减小；剪切强度包络线呈非线性，可采用通过原点的幂函数进行回归；细颗粒含量和法向载荷的升高会导致道砟材料表观摩擦角的减小；细小颗粒含量越高，道砟材料的剪胀效应越不明显；煤粉和细沙两种细颗粒均会降低道砟材料的剪切性能，但煤粉的影响更为显著。本文细小颗粒对道砟材料剪切性能的影响试验研究可为有砟铁路道床的运行维护提供依据。 |
| 英文摘要: |
| To investigate the characteristics of the shear behaviors of ballast materials filled with fine particles, a large direct shear apparatus is used to measure the shear mechanical properties of ballast materials filled with pulverized coal and fine sand, respectively. Under different vertical loads, the influence of fine particle materials with different contents on the shear properties of ballast materials are compared with the clean ballast materials. The test results show that the shear strength of ballast aggregates increases with the increase of vertical load, and decreases with the increase of fine particle content. Moreover, the envelope of shear strength of ballast materials behaves nonlinear, which can be regressed by the power function passing through the coordinate origin. The increases of fine particle contents and vertical loads result in the decrease of apparent friction angle of ballast materials. Compared with the clean ballast materials, the increase of fine particle content is negative to the ballast dilatation. Both the coal and sand particles can reduce the shear strengths of ballast materials, while the coal particles has more significant influence. The influence regularity of fine particles on the shear mechanical properties of ballast bed provides reference in the maintenance of ballasted track of railway. |
| 查看全文 下载PDF阅读器 |
| 关闭 |
