硅酸盐通报2026，Vol.45Issue(2)：712-724,13.DOI:10.16552/j.cnki.issn1001-1625.2025.0773
路基中粒砂岩在差速疲劳荷载作用下的变形与能量演化特征
Characteristics of Deformation and Energy Evolution of Roadbed Medium-Grained Sandstone under Differential Fatigue Loading
摘要
Abstract
In order to reveal the mechanical response mechanism of medium-grained sandstone under differential fatigue load,this paper studied the deformation characteristics and energy evolution law of sandstone under three loading modes(slow loading and rapid unloading,constant speed loading and unloading,rapid loading and slow unloading)through laboratory tests.The dynamic changes of peak strain,residual strain and energy dissipation of the samples were analyzed by MTS 322 rock mechanics test system.The results show that under varying loading modes,the strain exhibited by sandstone remains consistent,with the residual strain approximating the deformation discrepancy between successive cyclic stages.The peak strain is observed to be largest in the slow and fast unloading mode,and smallest in the fast and slow unloading mode.Furthermore,the residual strain exhibits a logarithmic growth at the initial stage due to the compression and density of the internal defects,and increases linearly with the maximum cyclic stress in subsequent stages.The input energy and elastic energy increase stepwise with the number of cycles,and the dissipation energy increase rate is significantly higher in the slow-plus-slow unloading mode than in the other modes.The dissipation energy of the first cycle of a single cyclic stage is elevated,and the mean dissipation energy is exponentially associated with the maximum cyclic load.The dissipated energy ratio fluctuates and converges with the number of cycles,a phenomenon that is closely related to the internal damage inhomogeneity of material damage and the fluctuation of loading stress.The present study elucidates the influence mechanism of loading rate on the fatigue performance of sandstone,thereby providing a theoretical basis for the selection of road base layer materials and structural optimization.关键词
中粒砂岩/差速疲劳荷载/力学特性/峰值应变/残余应变/能量耗散Key words
medium-grained sandstone/differential fatigue loading/mechanical property/peak strain/residual strain/energy dissipation分类
建筑与水利引用本文复制引用
刘高喜,吴云峰,刘永亮,刘勇..路基中粒砂岩在差速疲劳荷载作用下的变形与能量演化特征[J].硅酸盐通报,2026,45(2):712-724,13.基金项目
国家重点研发计划项目(2022YFC3004601) （2022YFC3004601）
