Compensating support of frame and anchor cable in fragmentized surrounding rock roadway and its application

In order to solve destruction of shed body in frame support,methods of engineering test,theoretical analysis and numerical simulation were used comprehensively in panel belt roadway in NO.2 coal mine to separately study the stress distributions in shed body and rock under the condition of with and without frame-anchor support.After having analyzed mechanism of compensation support,support scheme was designed and industrial experiment was conducted.The results show that bolt-mesh and frame used in frame-anchor support are independent of each other,the distribution of bending moment in shed body likes sine function.The maximum bending moment occur on straight walls,on the direction of horizontal 27 ° and 69 ° and the value is 52.48kN·m.It is greater than the yield moment,which makes straight wall breaks down easily.The force situation has been improved well after adoption of frame-cable support and the maximum bending moment is 10.58kN·m.It is 21.7% of the yield moment value,which is reduced 79.8% compared with the situation without adoption of compensation support.The effect of combined arch brought by bolt-mesh support is greater than before and it forms the stress increased area,which thickness is 1.2m to 3.6m,around the roadway.The shed body has no significant deformation till now.