Three-Dimensional Finite Element Modeling of Soft Rock Tunnel With Large Section: A Case Study

Abstract

With deep-buried depth, large span, high geo-stress, complex geological conditions, and its large sections, the deformation behavior of the Gaopo Tunnel is a complex three-dimensional problem. To reveal the deformation behavior of the tunnel and evaluate the current support scheme, this paper establishes a three-dimensional model by benching tunneling method, and compares the monitoring data to analyze the deformation behavior of the surrounding rock and the variation of the stress field in the support structure. The results demonstrate that the rock inclination angle is 4 • to 10 • , the micro-dip layered structure, which is the main factor for the asymmetric deformation behavior of soft rock tunnel with large section passing through coal seams. The maximum displacement of surrounding rock and the maximum stress of the supporting structure are within the safe range in current scheme. Furthermore, some measures are summarized, which may provide some reference for similar engineering in the future.

Vibration Response Characteristics and Application of Existing Railway Subgrade

“…Researchers have carried out a lot of theoretical analysis, numerical simulation test, indoor model test, and field test on vibration response characteristics and attenuation law of the railway subgrade [15][16][17][18][19][20][21][22][23][24]. In the early study of the subgrade vibration response, scholars considered the influence of thickness [5], grouping form [25], train speed [26], and properties of soil [27] on subgrade vibration response characteristics and attenuation law.…”