摘要
岩体结构面在地质工程中起着关键作用,其剪切行为对岩体稳定性和工程安全有着重要影响。为深入了解岩体结构面的剪切行为特征,运用PFC2D对不同粗糙度的规则结构面、不对称结构面、不规则结构面在不同法向应力条件下的力学行为进行分析。结果表明:试件受剪破坏模式可分为结构面沿锯齿表面滑动、结构面沿锯齿表面滑动且锯齿尖端剪断、破坏面由锯齿坡底贯穿至锯齿另一边、结构面锯齿底部完全剪断破坏4种类型;随着法向应力和起伏角的增加,破坏模式从结构面沿锯齿受力侧的边缘滑动,逐渐转变为沿整个锯齿表面滑动,最终演化为锯齿底部完全剪断;结构面剪切强度随着法向应力及起伏角的增加均呈近似线性增长;不规则结构面在初始阶段的剪切应力随剪切位移的增加呈近似直线增大,法向应力与节理粗糙度几乎无相关性。
The structural plane of rock mass plays a key role in geological engineering,and its shear behavior has an important influence on the stability of rock mass and engineering safety.In order to deeply understand the shear behavior characteristics of rock mass structural plane,PFC2D was used to analyze the mechanical behavior of regular structural plane,asymmetric structural plane and irregular structural plane with different roughness under different normal stress conditions.The results show that the shear failure modes of the specimens can be divided into four types:the structural plane sliding along the sawtooth surface,the structural plane slides along the sawtooth surface and the sawtooth tip is cut off,the failure surface penetrates from the sawtooth bottom to the other side of the sawtooth,and the sawtooth bottom is completely cut off.With the increase of normal stress and undulating angle,the failure mode gradually changes from the structural plane sliding along the edge of the sawtooth force side to the sliding along the whole serrated surface,and finally evolves into the complete shear of the sawtooth bottom.The shear strength of the structural plane increases approximately linearly with the increase of normal stress and undulating angle.In the initial stage,the shear stress of the irregular structural plane increases approximately linearly with the increase of the shear displacement,and the normal stress has almost no correlation with the joint roughness.
作者
辛文彬
吴鹏
崔松
李乐
XIN Wenbin;WU Peng;CUI Song;LI Le(Mine Rescue Center of Ministry of Emergency Management of P.R.C.,Beijing 100013,China;Changsha Branch,Zijin(Xiamen)Engineering Design Co.,Ltd.,Changsha,Hunan 410017,China;Beijing Jianlong Heavy Industry Group Co.,Ltd.,Beijing 100071,China;Beijing Branch,China Ping An Property Insurance Co.,Ltd.,Beijing 100032,China)
出处
《矿业研究与开发》
北大核心
2025年第8期147-154,共8页
Mining Research and Development
关键词
岩体结构面
剪切应力
法向应力
破坏模式
起伏角
Structural plane of rock mass
Shear stress
Normal stress
Failure mode
Undulating angle
作者简介
辛文彬(1983-),男,云南玉溪人,工程师,主要从事矿山安全生产和应急管理工作。E-mail:307030557qq.com。
