岩土力学2024，Vol.45Issue(7)：1917-1928,12.DOI:10.16285/j.rsm.2023.1228
高应变率冲击荷载下节理花岗岩损伤机制研究
Damage mechanism of jointed granite under high strain rate impact loading
摘要
Abstract
To study the dynamic response characteristics and energy evolution of through-jointed granite under impact load,granite with different dip joints was selected as the research object.Using the theoretical model of damage mechanics for jointed rock masses with varying dip angles,a series of SHPB(split Hopkinson pressure bar)impact tests was conducted on granite samples under high strain rates.The dynamic mechanical properties and energy dissipation characteristics of the rock samples were obtained.The results indicate that:(1)based on the Druck-Prager criterion,the Weibull strength distribution criterion,and the theory of elastic waves,the stress-strain model of jointed rock mass with different dip angles is established.This model can effectively reflect the dynamic mechanical properties of granite as the joint dip angle changes and exhibits a strong dip effect.(2)As the dip angle of the joints increases,the energy reflection coefficient rises linearly,the energy transmission coefficient decreases linearly,and the peak stress of the rock samples gradually decreases.Under the same joint dip angle,as the impact load increases,the energy reflection coefficient first increases and then decreases,the energy transmission coefficient first decreases and then increases,and the energy absorption rate decreases with the increase of the joint dip angle.(3)When the impact load is the same,the fragmentation degree of intact rock samples and those with joint dip angles of 0° and 15° is greater,while the fragmentation degree of rock samples with joint dip angles of 30° and 45° is smaller.When the joint dip angle is the same,as the impact load increases and exceeds the maximum compressive strength of the rock samples,the failure mode gradually transitions from shear and tensile failure to crushing failure,and the degree of fragmentation also increases.关键词
不同倾角/节理花岗岩/SHPB冲击试验/能量耗散/高应变率Key words
different dip angles/jointed granite/SHPB impact test/energy dissipation/high strain rate分类
建筑与水利引用本文复制引用
王智德,钱梦凡,李杰,司莹莹,江俐敏..高应变率冲击荷载下节理花岗岩损伤机制研究[J].岩土力学,2024,45(7):1917-1928,12.基金项目
国家自然科学基金(No.42077228,No.51374163) （No.42077228,No.51374163）
磷资源开发利用教育部工程研究中心开放基金资助(No.LKF202004) （No.LKF202004）
武汉市城乡建设委员会科技计划项目(武城建[2017]12号-201740,武城建[2019]68号-201941).This work was supported by the National Natural Science Foundation of China(42077228,51374163),the Open Project of Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education(LKF202004)and the Science and Technology Program of Wuhan Municipal Urban-Rural Development Bureau([2017]12-201740,[2019]68-201941). （武城建[2017]12号-201740,武城建[2019]68号-201941）
