对穿锚杆锚固参数对支护体支护效果影响

Analysis of Influence of Penetration Bolt Anchorage Parameters on Supporting Effect of Supporting Body

沿空留巷技术条件下,巷道间煤柱经常发生变形、破坏.为了研究对穿锚杆锚固支护对预留煤柱的支护效果,通过理论分析研究对穿锚固参数对预留煤柱单元体的力学性能的影响,发现:锚杆密度增大后,其峰值强度以及峰后强度均得到有效提升.且锚固体等效内聚力增量与锚固体峰后强度增量之间呈正相关关系;锚固体密度增大后,锚固体弹性模量并无明显增加,即锚杆施加对峰前应力应变关系改善不大;直径增大到一定值后,再增加锚杆直径,对锚固体峰后力学性能提升有限.

Under the technical conditions of retaining roadway along the empty road,the coal pillars between the roadways often undergo deformation and damage.Through theoretical analysis,the influence of the anchoring parameters on the mechanical properties of the reserved coal column element.The results show that:After the anchor density increases,Its peak intensity and post-peak intensity are effectively improved.And the linear relationship between the equivalent cohesive force increment of the anchor and the post-peak post-peak strength increment;After the anchor density increases,the elastic modulus of the anchor does not increase significantly,that is,the anchor is applied,but the stress-strain relationship before the peak is not improved much.After the diameter is increased to a certain value,the diameter of the bolt is continuously increased,and the mechanical properties of the anchor after the peak are limited.