巷道围岩中的裂隙发展与弱结构体

为了获得对深井巷道更加安全可靠的支护参数，基于宏微观裂隙对岩体稳定的重要影响，提出了深井巷道围岩中裂纹的形核过程和其损伤后形成“类板结构”和“块体结构”等问题．研究了深井巷道围岩中裂隙的产生和发展过程，阐述了巷道两帮裂纹在开挖后的二次应力作用下产生张性扩展破坏的机理，结合围岩中支承压力分布的特点，分析出其中存在5个力学性能不同的分区，在宏观张裂区的裂纹面将未受损伤的相邻岩石分割成厚度较小的“类板结构”，在宏观剪裂隙区“块体结构”的进一步失稳也会导致“类板结构”的形成，在压力的作用下“类板结构”发生屈曲。结果表明：“类板结构”的屈曲与后屈曲变形是引起巷道严重片帮与垮落的主要因素．

Fracture Development and Weak Structure in Surrounding Rock of Roadway

In order to obtain the parameter to support roadway more safely and reliably,based on the critical influence of macroscopic and microcosmic fissures on keeping the rock mass steady,the questions were presented that were the process of a fissure forming and growing in the rock mass around lane of deep shaft,and the formation of the "plank kind structure" and "block lumpish structure"by it.And the process of fracture produce and development in the rock around lane of deep shaft were studied.And the mechanism of rock crackle remittent enlarge and destroy in the both sides rock of tunnel under the second stress by excavating was described.Based on the distribution of the abutment pressure,five areas with different mechanics property were proposed.The face in the macroscopically extend fracture area divided the uncut neighbors rock into little "plank kind structure".The "block lumpish structure",been further destabilized,in the macroscopically shear fracture area will transform into "plank kind structure" either.The results show that buckling and post buckling of the "plank kind structure" can let tunnel lost steady.