Damage mechanism of jointed granite under high strain rate impact loading
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.
different dip anglesjointed graniteSHPB impact testenergy dissipationhigh strain rate
王智德、钱梦凡、李杰、司莹莹、江俐敏
展开 >
武汉理工大学土木工程与建筑学院,湖北武汉 430070
武汉市勘察设计有限公司,湖北武汉,430000
武汉职业技术学院建筑工程学院 湖北武汉,430074
不同倾角 节理花岗岩 SHPB冲击试验 能量耗散 高应变率
国家自然科学基金国家自然科学基金磷资源开发利用教育部工程研究中心开放基金武汉市城乡建设委员会科技计划项目武汉市城乡建设委员会科技计划项目Science and Technology Program of Wuhan Municipal Urban-Rural Development BureauScience and Technology Program of Wuhan Municipal Urban-Rural Development Bureau
国家科技期刊平台
NSTL
万方数据
