Device and method for testing pre-stress loss of unbonded pre-stress reinforced soil

The invention discloses an equipment for testing the pre-stress loss of unbonded pre-stress reinforced soil. The equipment comprises a box body, padding, an anchor device, a plurality of interstitial water pressure meters, a plurality of displacement meters, a plurality of soil pressure boxes, a core-penetrating dynamometer, a cover plate, a water discharging pipe and a water accumulating cup. The device and the testing elements are used for researching the degree and the mechanism of the pre-stress loss on a reinforced material. According to the device, the core-penetrating dynamometer connected with an anchorage device directly responds the change of pre-stress on the reinforced material and the deformation of the cover plate is measured by the displacement meters; the soil pressure boxes are used for measuring the distribution of a counter force under the cover plate and a soil pressure in the box body; the change of an interstitial water pressure is measured by the interstitial water pressure meters and the amount of water discharged by fillers is measured by the water accumulating cup. With the adoption of the measurement equipment, the degree and the mechanism of the pre-stress loss of the unbonded pre-stress reinforced soil can be researched.