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An experimental study of the confining pressure, i.e. additional hydrostatic pressure initiated by the tectonic force is presented. The experimental progress is that the σ1 is gradually increasing from 0 in a limiting movement (ε1=0) in the σ1 direction and the speed rate of the accelerating load is 0.4 MPa*s-1 in the lateral and level directions. When σ2=σ3