关键词: 层状剪切箱, 刚度可调, 振动台试验, 边界效应

Abstract: Based on the development experience of soil containers for shaking table tests, a multidirectional laminar shear model container with variable stiffness is designed to meet the needs of shaking table tests in geotechnical engineering under different site conditions. The container is constructed with a stack of annular steel frames, and supported by ball bearings and bolts. Its height can be adjusted according to the test conditions. By adjusting the stiffness, the number, and the arrangement of bolts, the stiffness of the container can be changed. The stiffness-variable characteristic of the container is verified by analyzing the characteristic frequencies of various combined model boxes in ABAQUS. Then a free-field shaking table test employing the container is performed. The test results are discussed in terms of the acceleration time histories and the corresponding response spectra at various heights and distances. A 2-norm deviation index is also used to quantify the boundary effects. The result shows that the developed laminar shear container does not impose significant boundary effect and is able to maintain the in-plane free-field response.

Key words: laminar shear container, stiffness-variable, shaking table test, boundary effects