基于塑性区分布的深部巷道支护技术研究

Study on Support Technology of Deep Roadway Based on Plastic Zone Distribution

应用弹塑性理论对深部不同侧压系数(λ)时圆形巷道围岩塑性区分布进行了研究,分析了巷道围岩塑性区分布的影响因素,研究表明:λ=1时,巷道围岩塑性区为圆形;λ≠1时,巷道围岩塑性区为椭圆形;塑性区范围与外载荷、侧压系数、岩石黏聚力及内摩擦角相关;λ>1时巷道支护应以控制顶底板为主,λ<1时巷道支护应以控制两帮为主。根据巷道围岩塑性区分布,研究了巷道锚杆、锚索长度设计参数,并进行了现场工业性试验,试验表明以控制深部巷道围岩塑性区的锚网支护技术能保证巷道稳定。

Abstract ： The plastic zone surrounding rocks of circular deep roadway is researched with different side pressure coefficient（λ ）using elastic -plastic theory, the influence of plastic zone distribution on surrounding rock is analyzed. The results show that ： λ = 1, plastic zone of roadway surrounding rock is circular ; λ ≠ 1, plastic zone of roadway surrounding rock is ellipse; the plastic zone is related to the external load and side pressure coefficient and rock cohesion and internal friction angle; λ 〉 1, roof and floor control should be emphasized in roadway support ; λ 〈 1, the two - sides control should be emphasized. Based on the distribution of plastic zone in surrounding rocks, the length of bolt and cable were designed, and the industrial experiment showed that, bolt support technology could guarantee the stability of deep roadway through controlling deep plastic zone in surrounding rock.