Abstract This article performs groups of shaking table tests to study the dynamic damage characteristics slope that is composed with inclined bedrock, upper overburden soil layer, and weak interlayer. The prototype entrance Mount Zheduo tunnel, which located in mountains western Sichuan Plateau China. test model designed based on similarity theory. peak ground acceleration (PGA) amplification coefficient, Fourier transform, transfer function theory are employed analyze results. results...

A monitoring project was implemented in trial sections of the Watang−Rizhao heavy-haul railway. Data were acquired at instrumented track formations and railway retaining wall during 30 passages train operating speeds ranging from 5 km/h to 100 km/h. At formation level, earth pressure cells mounted beneath 10 longitudinally adjacent sleepers, one which installed along with two integrated vibration sensors for vertical acceleration deflection measurements. The different elevations examining...

Taking a bedding rock slope with weak structural plane as the prototype, shaking table test similarity ratio of 1:10 is designed and carried out. By analyzing acceleration displacement responses at different positions slope, seismic response instability mechanism under amplitudes, frequencies, durations are studied. Before failure shows an obvious “elevation effect” “surface action Wenchuan Wolong earthquake wave amplitudes. With increase amplitude input wave, elevation effect surface...

To study the interface friction and vibration behaviours of brake systems with wheel flat, a rigid-flexible vehicle dynamics model finite element system are developed. These two models validated using experimental test data. Additionally, an analysis formula excited by flat is proposed to reveal tribological behaviours. The results indicate that directly induces elastic disc further affects contact, resulting in significant increase contact force, stress, force acceleration between...

We propose a novel hypocenter localization model based on machine learning in the hope of providing feasible solution for earthquake early warning system (EEWs). The predicts location using time series trigger stations. compare test results three models: 1) random forest (RF); 2) eXtreme gradient boosting (XGBoost); and 3) light (LightGBM). LightGBM is found most efficient thus applied further testing. Moreover, considering difference station between ocean land earthquakes, prediction models...

During vehicle operation, the brake system is influenced by wheel–rail interactions. To investigate dynamic behaviours of system, we propose a novel model considering coupling effects between disc–pad and subsystems. Using established model, nonlinear coupled including adhesion characteristics, wheel–disc torsional vibrations stick–slip were comprehensively explored. The results showed that braking conditions remarkably longitudinal slip rate. wheelset units affect each other, wheels on one...

ABSTRACT Automatic P-wave arrival detection is the first task in an earthquake early warning systems. This study proposes a novel method for this based on fractal slope (FS). We improved calculation of dimension to increase speed and proposed continuous algorithm. Furthermore, we applied FS conjunction with short-term average over long-term (STA/LTA), named STA/LTA + FS. designed orthogonal experiments different parameters selected total 40,020 sets seismic waves from Japanese dataset test...

Compaction quality of railroad subgrade relates directly to the stability and safety train operation, core problem Intelligent railroads is transmission evolution characteristics vibration wave. Aiming at shortages in exploring signal, typical compaction project Jingxiong Intercity Railway Gu’an Station was selected carry out field prototypes tests, dynamic response from vibratory roller filling materials monitored whole process, some efficient tests data will be obtained. Based on this,...

The underground structure that crosses the active fault will cause more serious damage under dislocation of fault. Relying on an actual tunnel in southwest mountainous area to establish a three‐dimensional finite element model, failure mechanism strike‐slip and thrust is revealed from lining deformation, stress distribution, plastic zone results show range distributes fracture effect greatly affected by movement amount mainly tensile damage, while shows compression both sides when there with...

Helical steel piles (HSPs) are currently used as supports for photovoltaic panels in seasonally frozen ground order to mitigate the adverse impacts of frost jacking; nevertheless, issues frequently arise due considerable frost-heave forces through domain and piles' limited embedment depth. This study aims properly estimate heaving HSPs mobilized resisting penetrates, providing a quick guide application. To this end, small-scale model tests were first performed on three types installed...

According to the potential disaster points of rock bedding slope with weak structural plane along Sichuan Tibet railway, shaking table test earthquake simulation is designed and carried out. The acceleration response displacement under different input conditions are monitored, HHT method mainly used analyze seismic slope. results show that shows obvious "elevation effect" "surface action waves intensities. With increase amplitude value earthquake, elevation effect surface gradually weaken....

By moving computing intensive tasks from resource-constrained smart mobile devices (SMDs) to edge cloud servers, Mobile Edge Computing (MEC) can significantly improve the service quality of SMD Apps and save energy. This paper proposes a three-layer heterogeneous network model accommodate competition user groups in different areas sharing limited bandwidth resources, be dynamic evolutionary game. A centralized algorithm for population evolution is proposed quickly achieve equilibrium, by...

On August 3rd, 2014, the Ludian earthquake in China with magnitude of 6.5 caused tremendous loss infrastructure systems. The Niulanjiang Bridge is a high pier bridge, which situates close to epicenter. In present paper, damage features lifeline system based on field investigations are firstly discussed. Then response analysis implemented by adopting real strong ground motions, and parts may be dangerous during this excitation studied. Finally, some seismic countermeasures for bridge proposed.

To reveal the failure mechanism of tunnel structure under active fault movement, based on pseudostatic elastoplastic finite element method, modes lining are studied different movement ratios strike‐slip faults and thrust with 45° dip angle by using numerical simulation. The results show that range significant section can be determined according to any direction coupling decomposition direction, damage effect is overall amount fault. area action same as deformation, which mainly manifests...