冰岩组合体动态力学特性及裂纹演化特征研究
Study on Dynamic Mechanical Properties and Crack Evolution Characteristics of Ice Rock Combination
黄明健 1黄贵臣 2李论 2潘大伟 2徐振洋3
作者信息
- 1. 鞍钢矿业爆破有限公司,辽宁 鞍山 114051;中南大学资源与安全工程学院,湖南 长沙 410083
- 2. 鞍钢集团矿业有限公司,辽宁 鞍山 114051
- 3. 辽宁科技大学矿业工程学院,辽宁 鞍山 114051
- 折叠
摘要
人工冻结法的富水基岩凿井掘进施工时,人工地下冰与岩体黏结面常受动态冲击作用影响,其稳定性决定了地下工程施工安全.为研究冰—岩复合结构的动态力学性能,采取PFC-FLAC耦合方法构建了SHPB加载系统,分析了冰岩组合体的动态特性与破坏特征,研究了试件微裂纹演化规律.结果表明:组合体试件的动弹性模量受冰岩交界面倾角θ影响较小;动载作用下组合体试件岩石中裂纹从入射端逐渐向冰岩交界面扩展,最终形成与加载方向平行的贯通主裂纹,微裂纹扩展"引导"了组合体的损伤过程;组合体试件的最终破坏形式表现为张拉与剪切复合破坏,其中岩石部分的破坏特征主要受θ影响;θ为0°～45°时,峰值应力相差不大;θ为45°～90°时,峰值应力随着θ升高呈增大趋势.
Abstract
During the excavation of water-rich bedrock by artificial freezing method,the bonding surface between artificial underground ice and rock mass is often affected by dynamic impact,and its stability determines the safety of underground engi-neering construction.In order to study the dynamic mechanical properties of ice-rock composite structure,the loading system of SHPB was constructed by PFC-FLAC coupling method.The dynamic characteristics and failure characteristics of ice-rock com-posite were analyzed,and the evolution law of microcracks was studied.The results show that the dynamic elastic modulus of the composite specimen is less affected by the inclination angle θ of the ice-rock interface.Under the action of dynamic load,the crack in the rock of the composite specimen gradually expands from the incident end to the ice-rock interface,and finally forms a penetrating main crack parallel to the loading direction.The propagation of micro-cracks'guides'the damage process of the composite.The final failure mode of the composite specimen is tensile and shear composite failure,and the failure charac-teristics of the rock part are mainly affected by the dip angle of the interface.When the dip angle of the ice-rock interface θ is 0°～45°,the peak stress has little difference,while the peak stress increases with the increase of θ,in the value ranges from 45° to 90°.
关键词
冰岩组合体/SHPB/PFC/交界面倾角/数值模拟Key words
ice rock combination/SHPB/PFC/inclination angle of interface/numerical simulation引用本文复制引用
基金项目
辽宁"兴辽英才计划"项目(XLYC2203173)
辽宁省中央引导地方科技发展资金项目(2023JH6/100400022)
出版年
2024
NETL
NSTL
万方数据