深井巷道底板岩体破坏机理及变形过程研究

Research on Failure Mechanism and Deformation Process of Floor Rock in Deep Roadway

为对深井巷道底鼓进行有效防治,需对底板岩体变形破坏机理进行研究,掌握底板岩体运移演化规律。利用弹塑性力学理论计算了巷道底板岩层的抗弯刚度和压曲临界载荷,得出了不同底板裸露长度、不同底板厚度情况下的压曲临界载荷曲线;以滑移线场理论为基础,以煤矿现场实测数据为参考,分析了底板岩层塑性区内岩体的运移演化过程,得出了塑性区内岩体的运移路径。

To control the floor heave in deep roadway effectively,the failure and deformation mechanism of floor rock should be studied to obtain the migration evolution rule of floor rock.The bending rigidity and buckling load of the floor strata of roadway were calculated based on the theory of mechanics of elastoplasticity,and the buckling load curve were obtained in case of different bare length and different width of the floor;the paper also analyzed the migrational and evolutionary process of the rock mass in plastic zones of the floor strata on the base of the slip line field theory and by the reference of the field measured data of coal mine,then got the migrational path of the rock mass in plastic zones.