脆性围岩中锚杆的应力分布及岩石剪涨角的影响  

Stress Distribution of Bolt in Brittle Wall Rock and Effect of Rock Shearing Expansile Angle

作　　者：朱训国[1] 杨庆[1] 栾茂田[1] 

机构地区：[1]大连理工大学

出　　处：《金属矿山》2007年第8期11-15,共5页Metal Mine

摘　　要：根据微段锚杆的受力平衡以及载荷传递机理建立了锚杆的载荷传递微分方程,同时根据隧道围岩安装锚杆前后的应变变形建立了锚杆的轴向载荷的传递方程,结合圆形隧洞脆性围岩的径向变形方程,推导了理想弹脆性围岩中注浆岩石锚杆的轴向应力的计算模型,以及锚固段与围岩体界面之间的摩阻力的计算模型。分析了锚杆应力的分布特征以及影响其应力分布趋势和大小的因素,其中重点对围岩体的剪涨角进行了分析。Load transfer differential equation for rock bolt is established according to the stress equilibrium and load transfer mechanism of small - section bolt, and the axial load transfer equation of rock bolt is also set up according to the strain deformation before and after the installation of rock bolt in the tunnel wall rock. In combination with the radial deformation equation of brittle wall rock in circular tunnel, the computing model for the axial stress of the grouted rock bolt in ideal brittle wall rock and the one for the friction resistance between the anchoring section and the rockmass interface are deduced, The stress distribution characteristics of rock bolt and the factors influencing its distribution trend and magnitude are analyzed, with the highlight on the shearing expansible angel of the rockmass.

关 键 词：岩石力学 注浆岩石锚杆 锚固机理 摩阻力 

分 类 号：TU452[建筑科学—岩土工程]