巷道顶板离层群对锚固荷载影响的弹性分析

Elastic Analysis of the Influence of Roadway Roof Separation Layer Group on Bolt Loading

巷道顶板围岩由于变形的不协调常常会产生单个离层或多个离层群。在单个离层弹性分析的基础上,根据叠加原理对离层群引起的锚杆应力分布进行了归纳,得出应力曲线为多峰曲线。通过对不同情况的参数分析,得出:离层值越大,离层位置越靠近边缘,离层对锚固体的荷载影响就越大。离层对锚固体剪应力的影响较大,锚固体界面会因离层值过大而产生滑移破坏。

Single separation layer or multiple separation layer group often occurred by the deformation incoordination of the roadway surrounding rock.Based on the elastic analysis of a single separation layer,the bolt stress distribution caused by the multiple separation layer group was summarized according to the superposition principle.The multiple peaks curves of stress distribution was got.By means of the parameters analysis under different situations,the analysis found that the higher of roof separation layer value and the roof separation layer location occurred closer to the boundary,the higher of the additional stress occurred from the bolt by the roof separation layer would be.The influence of roof separation layer on shearing stress is bigger than axial force of anchorage body.Anchorage interface will produce sliding failure because of big roof separation layer value.