METHOD Laboratory determination of fatigue strength and deformation of soil under triaxial CONTROLLED LOAD AND DEVICE FOR IMPLEMENTATION

摘要

1. A method for determining the fatigue strength of laboratory and controlled deformability of the soil under triaxial loading, consists in the fact that the prepared sample to the test water-saturated soil cylindrical shape is placed in a waterproof rubber sheath between upper and lower dies in a sealed chamber triaxial, and use stamps, provided with a filter plates and flexible drainage pipes connected to sources of the free ends of the negative pressure and excess liquid STI, as well as electronic sensors pore pressure and overlapping taps and subjected to sample a limited preliminary full pressure before the conditional stabilization and then, after covering the drain valve, to the upper die is applied via an electronic load cell of rod lift mechanism stage axial static load, according to the program tests, and after stabilization of deformation of the sample to the upper die through the stem-tail by a stand-alone device, apply low-frequ s, calibrated frequency and amplitude alternating symmetrical compressive and tensile loading the sample, modeling the seismic natural exposure to the foundation structures, and all agreed electronic instruments for measuring the pre-connected to the power electronic unit circuit with program control connected to the computer for operational processing results measurements, and to automatically change from one stage to another loading according to the program, wherein the test n