Study on the dynamic interaction between buried bent pipes and soil under the influence of oblique incidence of SV waves

The difference in stiffness between the direct-buried pipe and the surrounding soil is significant. Therefore, under the influence of oblique incidence of seismic waves, the movements of the pipe and surrounding soil are not synchronized, which can lead to buckling failure of the pipe. As a result, studying the dynamic interaction between buried pipes and soil under oblique incidence is an important field of research. Currently, most studies focus solely on the dynamic interaction of straight pipes with soil. Finite element simulations have been utilized in conjunction with shaking table tests in this paper to investigate the impact of various factors on the dynamic response of bent pipes in horizontal non-uniform fields subjected to oblique incidence of SV wave. The results show that pipe diameter, elbow angle, peak ground acceleration ( PGA ), and incidence angles have a significant influence on the dynamic interaction between the bent pipe and soil. Through regression analysis of the earth pressure at the elbow and along the straight sections, it was found that the earth pressure at the elbow is approximately 1.5–3.0 times that of the longitudinal straight pipe and 3.0 to 6.0 times that of the transverse straight pipe. Based on the empirical formula for earth pressure in straight pipes, the influence of elbow angle, PGA , depth-to-diameter ratio, and oblique incidence angle is incorporated into the analysis. The paper summarizes the calculation of influence coefficients for the dynamic earth pressure increment acting on the bent pipe under oblique incidence, which provides a reference for calculating the dynamic earth pressure on the bent pipe under seismic conditions.