The runway in permafrost regions has remarkable temperature sensitivity. Therefore, this paper puts forward to the parallel perforated ventilation subgrade. reliability and validity of finite element model with subgrade are verified by comparing previous studies. And cooling effect is analyzed. Results show that a significant on pavement little natural ground. Compared non-ventilation subgrade, time-history curves for change periodically each year gradually lower growth time....

The evaluation method of load transfer efficiency using falling weight deflectometer is unworkable in remote mountain areas and transportation difficult region. Therefore, a novation proposed the index amplitude ratio. Finite element applied to study influence dowel bar parameters (diameter, length, spacing, elastic modulus) pavement structures (thickness on efficiency, frequency, ratio amplitude. Results finite model show that effects structure are similar. enhance with increase diameter,...

The research attempted to analyse the pavement response under different vehicular speeds and roughness classes. viscoelastic analysis was conducted using three-dimensional asphalt structures. Pavement considered in moving multiple-axles load. And surface strain deflection responses were investigated based on dynamic of finite element (FE) model. Results showed that FE model captured main shape measured deflection. prediction errors strains deflections both less than 10%. time history curve...

This paper is concerned with the study of a kind discrete forcing immersed boundary method (IBM) by which loosely aero-elasticity coupled developed to analyze turbine blade vibration. In order reduce spurious oscillations at steep gradients in compressible viscous flowing field, five orders weighted essentially nonoscillatory scheme (WENO) introduced into flow solver based on large eddy simulation (LES). The three-dimensional (3D) full-annulus domain last two stages an industrial steam axial...

To maintain the temperature and settlement stability of a subgrade, combination graded crushed rock layer insulation may be applied to optimize pavement structures. This study verifies proposed numerical model subgrade design in permafrost regions evaluates characteristics at different particle size thickness location layer. The results show that crushed-rock decrease significantly as diameter increase, vary little when is more than 0.15 m. installation has significant influence on subbase...

Abstract This study analyzes the 3D (3D) strain on a pavement by using model of vehicle with seven degrees freedom and that road in elastic half-space finite element software ANSYS. The results are as follows: two wheels along centerline was significantly influenced superposition wheel, under single wheel far higher than wheels, represented most unfavorable position road. vertical consisted mainly compressive at different depths, bottom slightly top. longitudinal transverse strains were all...

Low-impact development measures are a kind of ecological technology system that can easily realize urban rainwater collection and utilization to alleviate the contradiction between flooding/water logging disasters water shortages. But most low-impact difficult solve problem deep soil infiltration fully utilize runoff regulation seepage benefits. Therefore, this paper proposes concrete microseepage well with optimum proportion crushed stone, cement, 1 : 0.13 0.11 2% steel fiber content. The...

Abstract Based on the coupling res model of vehicular and road, influences surface layer modulus, thickness equivalent modulus elasticity spectrum acceleration, deflection under wheels, strain at distance 0.4 m to 0.8 away from wheels are analyzed. Results show that fundamental frequency road pavement increases with growth elasticity, decreases increase thickness. Both deflections strains decrease as well Moreover, when is more than 2500 MPa 4000 MPa, have a little variation enhance...

The settlement in permafrost regions has a significant effect on the safety of aircraft. Therefore, numerical model asphalt concrete pavement and subgrade is proposed verified by comparing with previous studies. Numerical models under dynamic load aircraft are used to analyze nephogram, time-dependent curve, curve. Results show that influences different parameters settlements decrease slowly at depth 0–1.45m, then quickly 1.45-2m, finally tend be stable. peaks increase growth international...