PURPOSE: A large triaxial vibration test apparatus is provided to secure the safety of various civil structures by using in the evaluation of the safety, the design and the construction of a new civil structure. CONSTITUTION: A triaxial chamber(100) has a test piece(S) therein. A restrictive pressure generator(200) gives the isotropic pressure to be changed from the pneumatic pressure to the water pressure into the test piece. A perpendicular stocking device gives the compressive pressure to the test piece vertically. A hydraulic pressure generator(400) operates the perpendicular stocking device. An electric measuring and controlling device(500) measures the perpendicular load, the perpendicular displacement, the restrictive pressure, the gap water pressure, the volume change of the test piece according to the operation of the perpendicular stocking device and controls the triaxial chamber and the perpendicular stocking device according to testing conditions. Thereby, an input parameter for a design, a construction and a movement analysis is checked exactly.
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