冲击荷载下节理数对类岩石动力学特性的影响

发布时间：2018-06-07 03:15

本文选题：节理数 + 模拟岩石　；参考：《地下空间与工程学报》2017年S2期

【摘要】：用水泥砂浆材料模拟岩样并人工形成节理裂隙,以研究冲击荷载作用下节理数目对层状岩石动态力学特性的影响。借助分离式霍普金森压杆装置,研究完整岩石和含1~3条节理试件在相似冲击速度下的能量传递规律、强度特征及破坏形态。试验结果表明,相同入射能条件下,随着节理数从1条增加到3条,试件中的反射波形由近似的"V"形变成"U"形,透射波的幅值则逐步衰减;试件整体随着节理面的增多破坏更加严重,呈多块状;节理岩石动态承载力与节理组数呈负相关性。研究结果为地下工程多节理裂隙软岩的动力特性分析及不稳定围岩的开挖支护研究提供参考。
[Abstract]:In order to study the effect of joint number on dynamic mechanical properties of layered rocks, cement mortar is used to simulate rock samples and form joint fractures artificially. With the help of a split Hopkinson pressure bar apparatus, the energy transfer law, strength characteristics and failure pattern of the intact rock and the specimens with 1 or 3 joints at similar impact velocities are studied. The experimental results show that with the increase of the number of joints from 1 to 3, the reflection waveform changes from the approximate "V" shape to the "U" shape, and the amplitude of the transmission wave decreases gradually. With the increase of the joint surface, the failure of the whole specimen becomes more serious, and the dynamic bearing capacity of the jointed rock is negatively correlated with the number of joints. The results provide a reference for the analysis of dynamic characteristics of multi-jointed soft rock and the study of excavation and support of unstable surrounding rock in underground engineering.
【作者单位】：云南农业大学建筑工程学院;云南锡业研究院有限公司;云南锡业股份有限公司大屯锡矿;昆明钢铁集团公司大红山铁矿;
【基金】：国家自然科学基金(51604006) 云南省科技厅基础研究青年项目(2016FD029) 云南省教育厅科学研究基金(2016ZZX108)
【分类号】：TD315

【相似文献】