基于梁-拱式组合结构的薄层状复合顶板锚固设计

Anchoring Design for Thin-Layered Composite Roof Based on Beam-Arch Compound Structure

为了保证薄层状复合顶板条件下矩形巷道围岩的锚固支护效果,通过相似模拟试验,基于锚固体强化理论和普氏压力拱理论,提出和验证了顶板锚固的梁-拱式组合结构.以岩体结构为中心,进行围岩锚固参数设计,根据库仑准则和锚固体梁的剪切破坏准则计算下位顶板锚固体梁的厚度,据此确定顶板锚杆长度;根据顶板上部普氏拱高确定锚索长度;根据直接拱脚在巷帮的深度和相邻帮锚杆作用重叠区域的相互关系,探讨了帮锚杆长度、间排距的确定及校核方法.研究表明:在保证两帮锚固稳定的前提下,通过锚索的悬吊作用,下位锚固体梁与上位普氏拱形成组合锚固体自承和承载结构.

To anchor the thin-layered composite roof effectively,we performed the similar model test and proposed and verified the beam-arch compound structure based on the pressure-arch theory.According to the structure of rock mas and based on Coulomb criterion and the shear failure criterion,we determined the anchoring parameters such as the thickness of anchoring beam.On the basis of this,the roof bolt length was determined.The bolt space is discussed according to the relation between its length and the adjacent bolts＇ anchoring superposition area.The length of cable is determined according to the arch height.Base on the stability of anchored roadway sides,the structure which is composed of lower anchored rock beam and upper arch through the cable＇s suspending action ensures the stability of surrounding rocks.