Abstract:Based on the typical high gassy mine,taking Sunjiawan Mine in Fuxin for example,the experiment of desorption and seepage of coalbed methane(CBM) was performed continuously through first loading and last unloading after the sample was placed into the home-made triaxial osmoscope. The exploration and transportation processes of CBM were simulated under the condition of the complicated stresses. The relationships among effective stress,desorption character,and seepage character were presented. The relationship expressions were studied. Some novel interaction laws were obtained as follows:(1) the variation laws among desorption quality,desorption time and effective stress all have negative exponential decrement relationship,and the relationship is not correlated with the loading method. (2) a cut-off point in the effective stress exists,and the desorption quality and time will increase rapidly with the increase of effective stress when it is smaller than the cut-off point value. On the contrary,the increase extent will become smaller. For the Sun sample No.2,the cut-off point value is about 3.0 MPa. (3) a critical effective stress(such as critical desorption pressure) is found. The desorption quantity and time will be approached to zero when the effective stress is larger than the critical value. The critical value is about 10.0 MPa for Sun sample No.2. (4) in the loading processes,the relationship curves among effective stress,permeability and permeability coefficient show positive exponential decrement. This above indicates that the adsorption of CBM is the main control factor for the scope of smaller effective stress in the process of pore pressure increase. (5) in the unloading process,the relationship curves among effective stress,permeability and permeability coefficient are found with parabolic shapes. This demonstrates the existence of three main phases in the exploration of CBM in the experimental view:they are effective stress,matrix shrinkage and slippage effects.