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| 水泥沥青砂浆循环加卸载特性及其蠕变疲劳耦合损伤演化研究 |
| Cyclic Loading and Unloading Characteristics of Cement-Asphalt Mortar and the Evolution of Coupled Creep-Fatigue Damage |
| 投稿时间：2025-01-08 修订日期：2025-01-22 |
| DOI： |
| 中文关键词: CA砂浆 循环加卸载 损伤 蠕变 脉冲疲劳 寿命预测 |
| 英文关键词:CA mortar cyclic loading and unloading damage pulse fatigue creep life prediction |
| 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） |
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| 中文摘要: |
| 水泥沥青砂浆(Cement Asphalt Mortar，CA砂浆) 在高速铁路无砟轨道中起着支承、传载、减振隔振等重要作用，但在无砟轨道自重和列车荷载作用下往往过早发生损伤或破坏，严重影响高速铁路的运行安全和效率。因此，分析CA砂浆在循环加卸载作用下的力学特性，进而研究其在蠕变疲劳载荷耦合作用下的损伤演化和寿命预测具有实际意义。本文实验研究了CA砂浆在循环加卸载作用下的能量耗散特性，并提出了基于耗散能量累积的损伤演化方程，据此对CA砂浆在无砟轨道自重蠕变荷载和列车脉冲疲劳荷载作用下的耦合损伤及寿命预测进行了研究。实验结果和分析表明：CA砂浆在循环加卸载下的滞回特性和塑性应变累积特性具有典型的曼辛效应和棘轮效应；采用循环加卸载中CA砂浆的能量耗散定义损伤，能较好地描述CA砂浆损伤演化行为；在蠕变与脉冲疲劳耦合损伤的长期作用下，CA砂浆的寿命大幅降低，仅为无砟轨道自重蠕变荷载作用下的十分之一。 |
| 英文摘要: |
| Cement asphalt mortar (CA mortar) plays an important role in supporting, load transferring, vibration damping and isolating in the ballast track of high-speed railroad. But it is often damaged or destroyed prematurely, which seriously affects the operation safety and efficiency of high-speed railroad. Therefore, it is of practical significance to study the mechanical properties of CA mortar under cyclic loading and unloading, as well as its damage evolution and life prediction under coupled creep fatigue loading. In this paper, the energy dissipation characteristics of CA mortar under cyclic loading and unloading are investigated experimentally. A damage evolution equation based on dissipated energy accumulation is also proposed. On this basis, the coupled damage and life prediction of CA mortar under self-weight creep load and train impulse fatigue load of ballast track are investigated. The experimental results and analyses show that the hysteretic and plastic strain accumulation characteristics of CA mortar under cyclic loading and unloading have typical Mansing and ratchet effects. Using the energy dissipation of CA mortar in cyclic loading and unloading to define the damage can better describe the damage evolution behavior of CA mortar. The life of CA mortar under the long-term action of creep and impulse fatigue coupling damage is greatly reduced to one-tenth of that under the self-weight creep loading of ballast track. |
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