Critical permeating gas pressure test device and test method for water-saturated stratum tunnel face soil under three-dimensional stress
A technology of air pressure test and three-dimensional stress, which is applied in the direction of measuring device, surface/boundary effect, permeability/surface area analysis, etc., can solve problems affecting construction progress, reducing construction speed, increasing construction cost, etc., to reduce construction cost, Ensure construction safety and provide the effect of construction progress
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[0027] The present invention will be described in detail below in conjunction with specific embodiments.
[0028] figure 1 , figure 2 , image 3 Shown, a device for testing critical permeability air pressure of soil in the face of a saturated stratum under three-dimensional stress includes a sample saturation unit, a critical permeability air pressure test unit, an axial pressure simulation unit, and a radial confining pressure simulation unit;
[0029] Sample saturation unit: including side wall 7, upper permeable stone 1, lower permeable stone 2, upper cover 6 and base 9. The side wall 7 is bottomless cylindrical, and the original sample 4 is covered with a water-proof rubber membrane 3 In the side wall 7, the side wall 7 is closely attached to the water-resistant rubber membrane 3, and the upper and bottom of the original sample 4 are closely attached to the high permeability upper permeable stone 1 and the lower permeable stone 2, and finally the lower The permeable stone 2 i...
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