Study On Control Mechanism Of Cooperating Support Of Frame And Anchor Cable In Soft Fragmentized Surrounding Rock Roadway With High Stress

The soft fragmentized surrounding rock roadway with high stress accounts for quite high proportion among soft roadways in coal mine. Losing stability of supporting structure is the main reason for destroy of soft fragmentized surrounding rock roadway with high stress. Improving the bearing capacity and stability of supporting structure is very important for resolving the supporting problem in those roadways.In soft fragmentized surrounding rock roadway with high stress, it is difficult to shape dependable bearing structure by bolt-mesh support. And the u-steel frame cannot fit strong deformation of surrounding rock. Here cooperating support of frame and anchor cable can effectively control surrounding rock strong deformation.In cooperating support of frame and anchor cable, the u-steel frame which has high resistance and contractible, is used as the basic support. The frame with higher supporting resistance can improving the residual strength of fragmentized surrounding rock and can also be used as high strength protection surface component of small diameter pre-stressed anchor cable, and take advantage of anchor capacity of cable. Meanwhile the u-steel frame is compensated by anchor cable set in rational location. This is effective method to solve support problem in soft fragmentized surrounding rock roadway.The purpose of structure compensation is to decrease the bend stress in dangerous section by applying some compensation force in rational location of supporting structure. At the same time, the whole bend stress in supporting structure also to be decreased. The bearing capacity of supports can be fully played. The baring capacity and stability of supporting structure is also improved. That shows the small diameter pre-stressed anchor cable is ideal compensation instrument. The basic principle of structure compensation is proposed aiming at fully take advantage of the compensation instrument bearing capability and improving the stability of supporting structure.Based on the study mentioned above, the numerical model which revel the interaction mechanism between basic support and compensation instrument, is founded for semicircle shape roadway common used. The calculation formula of internal force and bend deformation of basic support is given in different load condition. And the rational compensation location, internal force, bend deformation are analyzed in detail for uniform load, symmetric bias load in humeral and vault. The effect of improving the structure stability and bearing capacity by structure compensation is also analyzed.At the same time, the mechanism of cooperating support of frame and anchor cable is studied by numerical simulation. The real bearing process of u-steel frame and interaction process between the frame and cable are studied in detail by the 1:1 similarity simulation experiment of cooperating support of frame and anchor cable. In addition, based on the circular roadway elastic-plastic mechanical model, the rational length of anchor cable for structure compensation and compensation opportunity are derived theoretically for cooperating support of frame and anchor cable.At last, the cooperating support of frame and anchor cable technique was successfully applied in two type of roadways effected by dynamic pressure or geological pressure and water.There are 86 figures, 16 tables and 119 references...