For the aerofoil of small wind turbine working under conditions low-Reynolds, aerodynamic performance seagull and NACA 4412 is contrastively analyzed while Reynolds-Number 、 by Fluent. The numerical simulation comparison shows that, when attack-angle range 0°~20°, life-coefficient increased 24.97%、46.02% 48.54% than respectively; attack angle 4°, lift-drag ratio 40.44%、43.14%和39.40% respectively. Under condition , normal 16.7% .Under same condition, separation point NACA4412 closer to...

Horizontally transverse isotropy (HTI) induced by vertical or subvertical aligned fractures is common for unconventional fractured porous shale oil gas reservoirs. Compared with the unfractured rocks, seismic response characteristics of PP-wave azimuthal amplitudes are usually disturbed and in situ stresses. Knowledge fracture properties, as well stresses, required to optimize horizontal planning hydraulic fracturing during production, inversion stresses from amplitude data fracture-induced...

Effective utilization of scarce water resources has presented a significant challenge to respond the needs created by rapid economic growth in China. In this study, efficiency joint operation Three Gorges and Gezhouba cascade hydropower plants terms power generation was evaluated on basis precise simulation-optimization technique. The conditions between 2004 2010 were utilized research order investigate major factors that could affect output complex. results showed current complex had...

The ultimate pullout capacity under inclined dynamic loading is an important measure of the destruction degree vertical screw piles (anchors) actions. Based on static and tests two kinds model piles, bearing was researched considering different distance-width ratio blade (D/W) preloading ratio. results compared well with other experimental data available in literature. This research reveals that D/W might determine failure (anchors), for example = 3.14 or 5; a critical dynamic-static (DSLR)...

Micro antislide pile is more and widely used in the emergent repair of landslide. But systematic complete understanding about its failure mechanism still insufficient; addition, theoretical study lags far behind practical application. Through largesized physical model experiment numerical simulation, paper analyses mode micro piles soil slope. The simulation prove fine effects piles, which allows large displacement sliding mass can delay collapse slope effectively, so it applicable for...

The stability of reservoir landslide would be influenced obviously by the fluctuation water level, especially when descends, which is different from common landslide. Due to unsteady seepage underground inside slope caused change analysis through fluid-solid coupling very complicated. At present, most people hold view qualitatively that less permeability coefficient and faster level changes, more unfavorable it stability. This lacks quantitative basis. Based on FEM strength reduction, paper...

For judging the security of pile foundation, loading static test is popularly used in engineering. Some conditions could confine this method to estimate ultimately according with objectivity, for example high bearing especial condition test, over length pile, etc.. So strength reduction (SRM) put research question basis ultimate capacity theory foundation and limit analysis FEM. The safety storage factor (SSF) SRM were built. have three item, (1) inflexion lies on F-s curve, bottom curve...

Abstract Piles have been successfully applied to stabilize landslides and slopes. In the existing design methods necessary stabilizing force supplied by piles is determined with prescribed safety factor using conventional limit equilibrium method, bending moment shear in are evaluated subgrade reaction method. However, as three-dimensional soil-pile interaction exists slopes stabilized piles, much more investigations understand mechanism exact evaluation of effect. present study...

In order to conduct the numerical simulation of rock and soil slope strengthened by micro-pile with reinforced bar, FEM strength reduction is combined program FLAC which possesses function analyzing tensile shear failure. The under plastic state due its mechanic features. Solid element ideal elastic-plastic constitutive model Mohr-Coulomb are applied as mass pile. calculation can work out safety factor slope, dynamic changing process pile deformation failure, failure mode after micro-pile....

Due to the special mesh structure, geo-grid material can avoid local subsidence of filling material, reduce uneven settlement soil mass largest degree and improve whole stability mass, so reinforced earth-retaining wall with is widely used in engineering. Meanwhile, researches on its dynamic characters are not enough it hard judge under seismic condition. When unstable failure happens, location surface hardly be identified. These disadvantages have seriously limited development this...

With the conduction of west development in China, constructions airports southwest mountainous areas are being carried out rapidly. Due to various exteriors limitations, embankment engineering often exist some problems such as large height and slope ratio. So stability high is very essential construction operation airport. The cost geo-grid material low convenient. embedding occlusion soil mass can be realized through its unique grid structure. practical shows that solved laying filling...

The paper adopts the interface element to simulate joints so as systematically and quantitatively study deformation around tunnel, mechanic state of lining stability under different inclining angles joints. result shows that tunnel deteriorates mainly along joint during inner convergence effects surrounding rock. When angle α=45°, is most serious, followed by when α=90°, α=60°, α=30° α=0°. At same time, influence on distribution axial force comparatively small. But bending moment shear...

The failure of slope is a gradual accumulation process. Under the effect many interior and exterior factors, some parts in reach yield with increase stress; sliding surface forms gradually till complete transfixion; plastic strain continuous increases, overall happens on slope. Traditional analysis method cannot display mechanic conditions whole process deformation, transfixion surfaces failure. Meanwhile, FEM strength reduction can quantitatively show deformation features occurrence...

On the stability analysis of complex slope, determination rock-soil masses shear strength parameters is very important. It’s necessary to use back method verify experiment result for important slope engineering. Because sensitivity displacement poor, so that we couldn’t get satisfactory by traditional method. Aiming at problems method, this paper puts forward a totally new analysis, which applicable through integration variable differentiation optimization and elastic-plasticity...