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不同载荷频率下有砟铁路道床累积沉降特性的离散元分析
DEM analysis of accumulated settlement characteristics of railway ballast bed under dynamic load with various frequencies
投稿时间:2019-05-13  修订日期:2019-06-04
DOI:
中文关键词:  有砟道床  离散元方法  累积沉降  载荷频率  GPU并行计算
英文关键词:ballast bed  discrete element method  accumulated settlement  loading frequency  GPU parallel calculation
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
季顺迎 大连理工大学工程力学系 jisy@dlut.edu.cn 
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中文摘要:
      为研究有砟道床在高频列车载荷作用下的累积沉降规律,建立工程尺度下枕木-有砟道床离散元计算模型。考虑道砟的非规则真实几何形态,利用不可破碎的簇颗粒模型近似构造。在10~100Hz载荷频率区间内,对比分析枕木位移、道砟颗粒在垂向和横向上的运动分布规律,研究分析道床在循环正弦载荷作用下的动力特性。数值结果表明:在载荷频率不超过60Hz时,道床累积沉降随着载荷频率的提高而逐渐增大;当载荷频率超过60Hz时,道床累积沉降随着载荷频率的提高而急剧增大,并在载荷频率为80Hz时达到最大值,而后道床累积沉降量随着频率的提高反而逐渐减小。此外,分析对比不同载荷频率下道床速度场分布及典型位置道砟的位移、加速度等物理量,表明80Hz的载荷频率下道床离散元模型的振动最强烈。
英文摘要:
      To investigate the characteristics of the accumulated settlement of railway ballast bed under high frequency train load, the discrete element method (DEM) of sleeper-ballast bed with engineering scale was established using the GPU high performance parallel computing algorithm. Considering the real irregular geometry morphology, the ballast particles are constructed with unbreakable clustered spheres. In the frequency interval of 10~100Hz, the dynamic characteristics of ballast bed were analyzed with comparing the vertical displacement of sleepers, as well as the movement distribution and vibration response of ballast in vertical and transverse direction. The simulated results show that the ballast accumulated deformation gradually increase with the increase of loading frequency if the loading frequency is lower than 60Hz. The ballast accumulated deformation increases rapidly with the increase of loading frequency if the loading frequency is greater than 60Hz, and reaches the maximum if the loading frequency is 80Hz. After that, the ballast accumulated deformation decreases gradually along with the increases of loading frequency. Moreover, the physical quantities, such as the velocity field of ballast bed, displacement and acceleration of ballast particles at different positions are compared with different frequency. It shows the obvious vibration occurs on the DEM model of ballast bed when the loading frequency is close to 80Hz.
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