Control technology of reserved surrounding rock deformation in deep roadway under high stress

The influence of support resistance on the deformation and plastic zone of roadway surrounding rock has been studied by theoretical analysis,numerical calculation and field test,and the coordinate supporting principles have been proposed,that the support structure should be adapted to the large deformation of surrounding rock. The research results show that under the condition of existing support,the effects of support resistance is quite limited to the deform- ation and plastic zone of roadway surrounding rock;there are always some deformation parts of the roadway surrounding rock cannot be controlled effectively by the existing support in deep mine with high stress;this deformation part is giv- en deformation,and the given deformation becomes more and more large with the mining depth increases. Therefore,in order to control the roadway surrounding rock in deep mine with high stress,some deformation space can be reserved during the roadway excavation,and thus the support structure can be adapted to the large deformation of surrounding rock to maintain the surrounding rock integrity,at the same time ensure the support structure not only can provide the support resistance but also not be broken. The practice results show that the integrated control technology of support mainly by reserved the deformation and “bolts+yield truss and anchor rope” and supplemented by anchor cable rein- forcement can effectively control the stability of roadway surrounding rock,and ensure the safety of roadway during its service.