冻结砂岩动态力学特性分析
Analysis of Dynamic Mechanical Properties of Frozen Sandstone
李永杨 1郝英奇 2陈旭东2
作者信息
- 1. 安徽建筑大学勘测设计研究院有限公司,安徽 合肥 230022
- 2. 安徽建筑大学土木工程学院,安徽 合肥 230601
- 折叠
摘要
为研究不同温度梯度下冻结砂岩的动态力学特性,文中设置6 个温度梯度冻结条件:25、-5、-10、-15、-20、-25℃,随后开展SHPB系列试验.试验结果表明,冻结后岩样内部的大直径孔隙随温度的降低而减小,中、小直径孔隙随温度的降低而增大;冻结砂岩的弹性模量随温度的降低总体呈增大趋势,峰值应力随温度的降低而增加,呈现明显的低温强化效应;峰值应变随温度的降低而减小,呈现出低温弱化效应.
Abstract
In order to consider the dynamic mechanical properties of frozen sandstone under different temperature conditions,this paper sets up six temperature gradient freezes:25,-5,-10,-15,-20,-25℃,and then conducts SHPB series experiments.The experimental results show that the large diameter pores inside the frozen rock sample decrease with the decrease of temperature,while the medium and small diame-ter pores increase with the decrease of temperature;The elastic modulus of frozen sandstone generally increases with the decrease of tempera-ture,and the peak stress increases with the decrease of temperature,showing a significant low-temperature strengthening effect;The peak strain decreases with the decrease of temperature,exhibiting a low-temperature weakening effect.
关键词
冻结/温度梯度/SHPB/核磁共振/应力-应变Key words
Freeze/Temperature gradient/SHPB/Nuclear magnetic resonance/Stress-strain引用本文复制引用
基金项目
安徽省住房城乡建设科学技术计划(2021-RK01)
安徽省住房城乡建设科学技术计划(HYB20230254)
出版年
2024
国家科技期刊平台
NSTL
万方数据