摘要
為模擬實際地震波作用下砂土的受震反應行為，因而發展出大型二維多層剪力試驗盒，並使用國家地震中心之振動台進行大尺寸物理模型二維振動試驗。本試驗之試體尺寸為1.88 mx 1.88 mx 1.52m，試驗盒以十五層鋁合金框架堆疊而成，每層框架能各自以兩組相互垂直之線性滑軌於水平面上進行平面二維無扭轉運動，並發展一大型砂土霣落器採用水中沉降法進行試體準備，再利用微貫入錐試驗及壓力波量測來檢測土壤試體之均勻度、密度與飽和度。振動台剪力盒試驗分別進行一維及二維兩種振動模式，根據初步結果可知此雙軸向剪力試驗盒之性能合乎要求，能夠將一維及二維之地震力傳遞至砂土試體，將來可用以進行地震作用下土壤液化、地盤受震反應與土壤結構互制之探討。
並列摘要
For the study of the soil behavior under earthquake shaking, a physical model test using a large-scale shear box on the shaking table at the National Center for Research on Earthquake Engineering (NCREE) is developed. A laminar shear box movable in 2 axes, with a specimen size of 1.88m×1.88m in plan and 1.52m in height, is designed and manufactured in cooperation with Mechanical Industry Research Laboratories at Industrial Technology Research Institute. The shear box is composed of 15 layers of aluminum alloy frames. Each layer consists of an inner frame and an outer frame, which are allowed to move freely without torsion on the horizontal plane subjecting to the two-dimensional shear wave action induced by the shaking table. The sand specimen inside the shear box is prepared by the wet sedimentation method from a specially made pluviation device. The uniformity, density and saturation of the sand were checked by mini-cone penetration tests and P-wave velocity measurements. Pore pressures within the soil, displacements, accelerations and velocities of various depths of the frames were measured during tests under both one- and two-dimensional shakings. The preliminary test results show that the performance of the biaxial shear box is satisfactory. This shear box on shaking table will be used to study the problems of soil liquefaction, ground motions, and soil-structure-interaction during earthquakes.