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Abstract Flexible boundary loading is necessary for the real simulation of stress boundary condition，and is the premise to ensure the accuracy of geotechnical material test and geomechanical model test. A new flexible uniform pressure loading device is developed，which includes hydraulic cylinder，rigid thruster，hyper-flexible adjusted rubber and flexible transfer rubber etc. The force-transfer effect of flexible boundary loading is proved by numerical method；and the special flexible rubber which is suitable for test on rock and soil is developed by mix proportion test. The device is applied to the test，of which loading effect is compared with the one of rigid loading. The results show that the effect of flexible uniform pressure loading is more significant than that of rigid loading；and the flexible transfer rubber can transfer uniform pressure better on model with uneven surface. The even degree of model initial stress field increases with the Shore hardness of uniformity transmission rubber pads decreasing，loading stress increasing and depth from the surface increasing. The flexible loading device with hyper-flexible adjusted rubber and flexible transfer rubber has good character of space rotation and force transmission，and satisfies the demand of flexible loading on model with uneven surface or leaning surface. The study shows that the flexible uniform pressure loading device is able to implement the real simulation of stress boundary condition and improve the accuracy of test on rock and soil.
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Received: 01 May 2011
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2012, Vol. 31 
