The stability of a tunnel face and the rationality its supporting structures are guarantees for safe construction. This paper established quantitative analysis model stability, obtained calculation formula coefficient based on silo theory surrounding rock, then realized description under condition pipe roofing support, bolting grouting support reserved core soil. Finally, discrimination optimiz...

Under the condition of super-shallow coverage and small spacing, tunnel construction is easy to cause large structural deformation. The mechanical properties supporting effect with spacing are summarized. Finite element software used simulate on group by changing distance. results show that increase distance, settlement value middle has a smaller distribution law, when distance exceeds 3 m, max...

Abstract Due to the increasing population and resulting transportation needs, number of subway high-speed railway projects has also increased. The geometric constraints such have caused many tunnels be built in weak ground. Thus, ground tunnelling attracted attention tunnel engineers researchers. main purposes this study are analyse T4 excavated compare results obtained from analytical solution...

The paper investigates the long-term seismic behaviour of an underground reinforced concrete (RC) metro tunnel in Santiago, Chile, considering combined effects chloride-induced corrosion and cumulative, low-amplitude shaking on structure's performance. soil-tunnel response is evaluated with aid transient, nonlinear finite element analysis using a two-dimensional (2D) plane strain numerical mode...

The purpose of this work is to look at how soil heterogeneity and pore water pressure impact shield inclined tunnel excavation face stability as burial depth varies. calculation model was established, the supporting maintain solved via upper bound method. results showed that coefficient had substantial effects on pressure. location failure range under varied were presented. In addition, boundar...

Several engineering practices have shown that the excavation of shallow-buried tunnels beneath major roads, as well selection appropriate measures and construction methods, has a significant impact on road surface settlement. Therefore, field monitoring numerical simulation are adopted in this study to analyze effect cross diaphragm (CRD) method settlement for under-construction Yüan 1 railroad...

Introduction: Single-bundle anterior cruciate ligament (ACL) reconstruction has been the standard option to treat ACL-deficient knees. However, biomechanical studies have shown that normal rotational laxity cannot be restored with single-bundle reconstructions [1]. Recently, anatomic reconstruction of the anteromedial (AM) and posterolateral (PL) bundles has been introduced [2]. However, it rem...