Research On Surrounding Coal And Rock Of Soft Coal Roadway Creep Buckling Mechanism And Its Supporting Technology

Stress field, temperature field and the fracture field Influence on stability of soft rock roadway surrounding rock. As time goes by, different degree of creep deformation will occur. If the soft rock roadway cannot receive timely and effective support, the creep deformation will result in surrounding rock of roadway roof caving, nicking and floor heave. Therefore, this thesis study the creep characteristic of soft coal roadway surrounding coal and rock and put forward creep analysis model for the coal and rock mass. It has important theoretical significance and engineering application value in predicting coal and rock creep buckling time and research on roadway supporting technology.The main research work are as follows:(1) On the basis of the theory of coal and rock creep and the result of creep experiment, refine the original model is supposed to be a good model to simulate the different stress under the action of coal and rock creep law of roadway, It can not only describe deceleration of the coal and rock creep process and the constant creep process, but also can describe the process of accelerated creep.(2) Time prediction formula of creep instability is given by combined the creep instability criterion of coal with rock and refine original model. Its stability is analyzed. IT is a way to forecast the creep instability of Coal and rock roadway and provide theoretical basis to the roadway support best time.(3) Collect soft coal and rock in coal roadway, IT is carried on the acoustic emission of uniaxial compression creep test by Collected soft coal and rock in coal roadway and analyse the acoustic emission signal energy and ringing count by EMD. Analysis results show that the acoustic emission signal decomposed mainly three time periods correspondencd to the decelerating creep stage of coal sample, the constant creep phase and the corresponding accelerated creep stage.(4) According to the result of anisotropy of mechanical properties effect creep buckling, Roadway of coal and rock creep buckling characteristics, process is analysed by UDEC software and puts forward the relative countermeasures for the construction of roadway support according to the results of numerical analysis.(5) The above research results is applied to the soft coal roadway supporting engineering. The time of creep instability through the creep buckling prediction formula is correspond to The surrounding rock instability of time. The surface of surrounding rock convergence displacement distribution regularity of deformation which Floor heave is greater than two convergence value and two convergence value is greater than the vault sink were presented.