Buildings (structures) with various structural forms are becoming increasingly prevalent and encountering more challenging engineering issues. Field investigations, laboratory tests, numerical simulations were used to study the disaster-causing mechanism control technology for a variable cross-section tunnel passing through layered, expansive mudstone stratum. The deformation stress characteris...

In this article, the authors present an experimental investigation of thermochemical relaxation regions downstream symmetric Mach reflections generated in 8.5 flows with stagnation enthalpies from 7 to 10 MJ/kg. The experiment was performed Hypervelocity Expansion Tunnel at National Aerothermochemistry and Hypersonics Laboratory Texas A&M University. focused on studying nitric oxide morphol...

In constructing high-geo-stress soft rock tunnels, the major deformation disaster of surrounding has always been main problem faced during construction. The research on and loose zone characteristics large tunnels positive significance for safe rapid construction tunnels. Therefore, based Yuntunpu tunnel, this article first analyzes geological tunnel site area in response to deformation. Subseq...

The present study describes a simulator study on the merging of traffic from entry-ramp tunnels into the main Stockholm bypass tunnel. The present study focuses on two of the five junctions with connections at Lovö and Vinsta. Three research questions were formulated relating to 1) Is there a difference in the subjective and/or objective measures between the two different entry-ramp tunnels (Lo...

An existing open circuit wind tunnel has been modified to incorporate a secondary supply loop to provide controlled flow conditions at the inlet to a film cooling hole model. The primary or crossflow fluid enters from atmosphere through a smooth two dimensional contraction before entering the working section. The newly constructed supply loop has a single inlet from a high pressure source, in-l...

Trapezoidal cross-section with overhangs/lateral cantilevers are being increasingly adopted for medium span cable stayed bridges. Wind tunnel investigations have been carried out to study the aerodynamic characteristics of a trapezoidal section using pressure and force measurement. Simultaneous measurement fluctuating pressures overall forces under uniform, smooth inflow low various angles wind...

Tunnel portal sections always suffer serious damage under strong earthquakes. This paper aims to study the seismic performance of lining strengthening method in soft rock section by employing model test. Firstly, shaking table test considering cases, modified input motions, boundary condition, and monitoring equipment are conducted simulate response tunnel section. Then, increasing concrete gra...

Abstract The measured swelling pressures against tunnel linings range between a fraction of one MPa and 6–7 MPa. A strong spatial heterogeneity is often observed. paper integrates these considerations into procedure to design in anhydritic formations. Three-dimensional effects proper consideration shown be consistent with monitoring data lining reinforcement stresses. calculation methodology il...