Renpeng Chen

TL;DR: In this paper, a series of 3D large-scale model tests with a tunnel of 1m diameter were conducted in dry sand for various cover-to-diameter ratios C / D ǫ = 0, 1, and 2 (ie, relative depth; C is the cover depth and D is the diameter of tunnel) each test provided a measurement of the support pressure and the ground settlement with the advance of face displacement.

TL;DR: In this paper, the failure mechanism and limit support pressure of a tunnel face in dry sandy ground were investigated by using discrete element method (DEM), which has particular advantages for revealing mechanical properties of granular materials.

TL;DR: In this article, the influence of a nearby large excavation on existing metro tunnels of the Ningbo Metro Line 1 in sensitive soft soils is investigated and presented, and several protective measures are studied, including divided excavation, soil improvement and a cut-off wall.

TL;DR: In this paper, the authors present comprehensive experimental results on track vibration and soil response of a ballastless high-speed railway from a full-scale model testing with simulated train moving loads at various speeds.

TL;DR: A modified index that defines the physical significance of the input parameters was proposed to quantify the geological parameters, which improves the prediction accuracy of ANN models and found the GRNN model to outperform the BP and RBF neural networks in terms of accuracy and computational time.