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Abstract A self-developed triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane is introduced. It is composed of servo-controlled loading system，triaxial compression chamber，water bath with thermostatic control system，interstitial pressure control system，data measuring system and supporting system. The maximum axial pressure is 100 MPa；and the maximum confining pressure is 10 MPa. The heating temperature can reach as high as 100 ℃；and the dimensions of tested cylinder samples are f50 mm×100 mm. There are some advantages of the seepage equipment：(1) Tests performed on this equipment can show the comprehensive influence of geostress，gas pressure and temperature up on permeability of coal containing methane. (2) Many kinds of load forms can be completed on this servo-controlled system. (3) Plane-charging can be carried out for the coal sample，which reflects the actual gas source situation of coal bed. (4) An orientation system is designed to insure the accuracy of the data achieved in the tests. (5) By using the sensors，the data are more sensitive and accurate. (6) A large-scale water bath with thermostat-controlled system is designed；and a water circulating pump is also installed. (7) It can be used to study permeability and deformation characteristics of coal containing methane. Experiments on coal containing methane with different confining pressures and different temperatures in the seepage equipment demonstrate that the deformation of coal containing methane has four stages；and the compressive strength increases with the increase of confining pressure. Moreover，the seepage discharge is different in each stage and declines with the increasing of temperature in general. The seepage equipment can be used to study certain scientific law of thermo-fluid-solid coupling seepage of coal containing methane，which can provide fundamental basis for studying gas movement in underground coal seam and gas suction technology.
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Received: 17 November 2009
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