Abstract The gas seepage law in a single fracture under 3D stress is studied and the following conclusions have been made：(1) the tangent deformation has the same effect as normal deformation on fracture seepage law，and (2) gas seepage law is different from water seepage law. Moreover，an analytic formula of gas seepage law in a single fracture is presented. In the end，experimental data are analyzed by using the theory above and the results show such theory can reasonably describe the gas seepage law in a single fracture under 3D stresses.
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Received: 19 September 2003
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