Two-dimensional analysis of open trench as passive barriers in saturated soil
SHI Gang1，2; GAO Guang Yun2
1. School of Civil Engineering, Zhenzhou University, Zhengzhou 450002, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092
Abstract：This paper presents a study on the problem of the ground vibration isolation efficiency by open trench as passive barriers in homogeneous saturated ground. The investigation is accomplished with the aid of the semi-analytical boundary element method (BEM) in cooperation with the basic solution of the thin layered method (TLM). Consequently, a two-dimensional (2D) semi-analytical BEM model is put forward, where the TLM basic solution is employed, to use open trench as passive vibration isolation taking into account the dynamical interaction of soil-structure. Effect of the model parameters on effectiveness of vibration isolation by open trench is investigated and discussed in detail. The results show that open trenches are efficient to isolate the ground vibrations due to the incident Rayleigh wave. When the depth of the open trench is less than a Rayleigh wavelength, increasing the depth results in an increase in the screening effectiveness, and that the width has less effect on vibration isolation efficiency. Furthermore, the parameters of saturated soil, as well as the drainage boundary conditions of half-space, have less effect on the screening effectiveness.
2011, Vol. 30 
