The water inrush of the Shangjiawan karst tunnel is used to study evolution pattern precursor information in water-filled caves and further reveal matching mode information. three-dimensional numerical method FLAC3D was simulate process after damage a water-blocking rock mass structure cave obtain water-inrush caused by damage. results show that multifield response characteristic fracture follo...

The accurate prediction and evaluation of stress displacement fields surrounding rock is the fundamental premise for deformation control soft tunnels under high geo-stress condition. However, due to complicated mechanical characteristics with confining pressure influence, current numerical simulation method usually regards parameters as constant ignores variation these in process, which leads r...

Failure analysis and fatigue life prediction are necessary and critical for engineering structural materials. In this paper, a general methodology is proposed to predict fatigue life of smooth and circular-hole specimens, in which the crack closure model and equivalent initial flaw size (EIFS) concept are employed. Different effects of crack closure on small crack growth region and long crack g...

The black hole binary system LMC X-3 has been observed by virtually every X-ray mission since the inception of X-ray astronomy. Among the persistent sources, LMC X-3 is uniquely both habitually soft and highly variable. Using a fully relativistic accretion disk model, we analyze hundreds of spectra collected during eight X-ray missions that span 26 years. For a selected sample of 391 RXTE spect...

According to the damage evolution model of rock mass under stress-seepage coupling effect, representative element theory is employed describe change law mesostructure. Based on elasticity and Weibull distribution, statistical constitutive finite numerical algorithm are established, by adopting COMSOL Multiphysics software MATLAB program. Besides, validity verified triaxial compression test. hyd...

Characterization of properties of composites has attracted a great deal of attention towards exploring their applications in engineering. The purpose of this work is to study the difference of two computational microstructure models which are widely used for determining effective transverse elastic properties of unidirectional fiber reinforced composites. The first model based on the classic me...

What is the smallest circular or square wall hole that a regular tetrahedron can pass? This problem was solved by Itoh–Tanoue– Zamfirescu [8]. Then, we settled the case of equilateral triangular hole in [1]. Motivated by these results, we consider the corresponding problems in higher dimensions. Among other results, we determine the minimum (n−1)-dimensional ball hole that a unit regular n-simp...

In order to solve the support problem of deep soft crushed coal roadway, a concentrated cavern in mining station mine is taken as test object. Based on analysis and summary field observation data law rock pressure appearance, new technology relief anchoring with main body “initiative + borehole relief” proposed. This will carry out strong active shallow part surrounding excavate row low-density...