冻结裂隙岩体静态压缩力学特征及破坏机制

Efficient blasting and disaster prevention in frozen fractured rock masses have become a focal point in alpine cold region geotechnical engineering.To study the static mechanical characteristics of frozen fractured rock masses and the mechanism of ice-filled flaws on fractured rock masses,frozen fractured rock masses were selected as the primary research object.Original rock samples were drilled and processed from the Yulong Copper Mine in Tibet,China,to create artificial frozen marble specimens containing ice-filled flaws.Initially,laboratory tests were conducted to analyze the static mechanical characteristics of frozen fractured rock masses,considering the impact of different geometric characteristics of ice-filled flaws.This revealed the interaction patterns between ice and rock and the mechanisms of crack initiation,propagation,and penetration.Additionally,the cracking process as well as energy accumulation and release were further analyzed using RFPA3D.The research results indicate that the compressive strength of frozen fractured rock masses increases with the angle of the ice-filled flaw,showing an upward trend,while it gradually decreases with the increase in the width and length of the ice-filled flaw.The failure mode is significantly influenced by the angle of the ice-filled flaw.Compared to specimens without ice-filled flaws,those with ice-filled flaws exhibit improved compressive strength,as the ice-filled flaws provide bearing and consolidation during compression.The comparison between experimental and numerical simulation results confirms that RFPA3D is an effective numerical method for studying the compressive characteristics of frozen fractured rock masses.