中山大学学报（自然科学版）（中英文）2025，Vol.64Issue(2)：120-128,9.DOI:10.13471/j.cnki.acta.snus.ZR20240276
加载速率对青砂岩抗拉特性及断裂能耗的影响
The influence of loading rate on the tensile properties and fracture energy consumption of Green sandstone
摘要
Abstract
The macro-micro mechanical relationship of Green sandstone was established by indoor experiments and microscopic parameter calibration.The mechanical properties,crack evolution law,and energy utilization efficiency under different loading rates were analysed.The results showed that:(1)When the loading rate is less than 0.1 m/s,the stress-strain curve shape of the Green sandstone is basically consistent,and the smaller the loading rate,the more significant the Brittle failure.The tension chain is the main cause of crack propagation and extension,and the ultimate fracture is the result of the interaction between pressure and tension chains.(2)The fracture morphology of green sandstone can be divided into the failure way dominated by the main crack,the failure way where secondary cracks appear,and the failure way where secondary cracks penetrate.With the increase of loading rate,the number of cracks and the number of fracture elements in Green sandstone show a similar trend.(3)The loading rate is 0.000 5～0.1 m/s,and the input energy fracture energy curve shows up and down fluctuations,but the fluctuation range is small;When the loading rate is 0.5～1 m/s,the input energy shows a nearly linear increase trend,the fracture energy shows a rapid increase,and then a slow trend.The energy utilization efficiency is mainly concentrated in 10.262%～11.511%.关键词
青砂岩/加载速率/巴西劈裂/抗拉特性/断裂能Key words
Green sandstone/loading rate/Brazil splitting/tensile properties/fracture energy分类
建筑与水利引用本文复制引用
赵环帅,潘永泰,乔鑫,王星宇,毕研琨,余超,曹行健..加载速率对青砂岩抗拉特性及断裂能耗的影响[J].中山大学学报（自然科学版）（中英文）,2025,64(2):120-128,9.基金项目
国家自然科学基金(52074308) （52074308）
