弱结构巷道围岩变形破坏与非均称控制机理

Deformation Failure and Non-Harmonious Control Mechanism of Surrounding Rocks of Roadways with Weak Structures

依据煤系地层围岩弱结构巷道变形破坏的不均衡特征,提出了弱结构体变形破坏的“控制部位”与巷道围岩的“非均称控制”概念;分析了围岩弱结构巷道的非均称控制机理;运用有限元法对弱结构巷道的塑性区分布特征、非均称控制进行了模拟.结果表明:围岩弱结构类型及工程应力环境对巷道围岩破坏区域发育形态及围岩稳定性具有重要影响,弱结构体起着主控作用;侧压系数λ<1时,应尽量选择Ⅱ,Ⅲ,Ⅵ型弱结构类型;λ>1时,应选择Ⅱ,Ⅳ型岩性弱结构类型;λ=1时,依据巷道支护方式不同,应分别选择Ⅰ型或Ⅱ型弱结构类型.

According to the non-equilibrium characteristic for the deformation failure of roadways surrounding rocks with weak structures in the coal measures strata, the concepts of control location of deformation failure in weak structure body and non-harmonious control of surrounding rocks were proposed. The non-harmonious control mechanism of surrounding rocks of roadways with weak structures was analyzed. The plastic areas distribution and non-harmonious control of roadways with weak structures were simulated by finite element method （FEM）. The results show that the damage zone growth characters and the stability of surrounding rocks of roadways are influenced by weak structure types of surrounding rocks and stress states, and the weak structure body has the leading role, When the coefficient of horizontal pressure λ 〈1, the weak structures type Ⅱ, Ⅲ, Ⅵ should be first chosen; When λ 〉 1, the weak structures type Ⅱ ,Ⅵ should be first chosen; When λ = 1, the type Ⅰ or Ⅱ should be chosen separately according to different roadway supporting types.