负温饱水弱胶结砂岩动态力学特性研究  

Dynamic Mechanical Characterization of Weakly Cemented Sandstone with Negative Temperature and Water Saturation

作　　者：温建强 王梦想 WEN Jianqiang;WANG Mengxiang(Foundation of Engineering Research Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《佳木斯大学学报（自然科学版）》2024年第11期71-74,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：安徽省教育厅高校自然科学基金项目(2022AHO50841)。

摘　　要：西部矿井建设受制于其独特地质环境,而冻结爆破竖井掘进有效克服深部富水环境,因此研究西部饱水弱胶结砂岩在负温环境动态力学特性对实际工程具有参考意义。以此开展SHPB动态压缩试验研究饱水白砂岩动态力学特性,得出:(1)饱水白砂岩动态应力应变曲线可分为线弹性阶段、应力屈服阶段和卸载阶段。(2)饱水白砂岩峰值应力随应变率增大而增大。饱水白砂岩峰值应力随温度降低表现出明显增强效应。(3)结合饱水白砂岩能量耗散与破坏形态分析可得,随应变率破坏整体变化规律为破碎程度逐渐加剧,对应能耗密度随应变率增大而增加。饱水白砂岩随温度破坏规律为破坏程度逐渐减小,对应能耗密度随温度降低而增加。The construction of western mines is constrained by its unique geological environment,and the freezing and blasting shaft digging effectively overcomes the deep water-rich environment,so the study of the dynamic mechanical properties of western water-saturated weakly cemented sandstone in the negative-temperature environment is of reference significance to the actual project.To carry out SHPB dynamic compression test to study the dynamic mechanical properties of water-saturated white sandstone,it is concluded that(1)The dynamic stress-strain curve of water-saturated white sandstone can be divided into linear elasticity stage,stress yielding stage and unloading stage.(2)The peak stress of saturated white sandstone increases with the strain rate.The peak stress of water-saturated white sandstone exhibits a significant enhancement effect with decreasing temperature.(3)Combined with the water-saturated white sandstone energy dissipation and damage morphology analysis can be obtained,with the strain rate of the overall rule of change of damage for the gradual increase in the degree of fragmentation,corresponding to the energy density with the increase in strain rate and increase.Water-saturated white sandstone with the temperature damage law for the destruction degree gradually reduced,corresponding to the energy consumption density with the temperature decreased and increased.

关 键 词：弱胶结砂岩 应变率 能量耗散 破坏形态 

分 类 号：TU452[建筑科学—岩土工程]