The joint of a shield tunnel segment is the weak part tunnel, and opening amount seriously affects watertightness internal structure tunnel. In this experiment, model was created with ANSYS, fluid–solid coupling effect seawater seabed considered using SuperFLUSH/2D 6.0 software, local site by free-field seismic response analysis. Considering stress characteristics in conjunction marine area, earthquake research on culverts conducted lateral longitudinal beam–spring models. main focus article...

Coal seam destabilization inflicts damage to equipment, causes property loss and personnel casualties, severely threatens mining safety efficient production. To further understand this based on the basic theory of Lippmann destabilization, a mathematical model was introduced for gas pressure distribution by considering intermediate principal stress support resistance. Subsequently, we established translation suitable entire roadway coal with rocky roof floor applying unified form yield...

Coal spontaneous combustion (CSC) often occurs in environments that are poorly ventilated or under lean-oxygen coal mines seam outcrops. The understanding of the thermodynamic properties CSC conditions is important to avoid safety and environmental problems. In this paper, mass variation critical temperature (the minimum required for reaction each stage) six coals during were investigated using thermogravimetric methods. Furthermore, thermodynamics parameters kinetic compensation processes...

The permeability of the coal body is key parameter restricting efficient extraction coalbed methane, and scholars have analysed it from two angles change stress state porosity body. However, there still a lack study on mechanism gas migration movement in soft methane reservoir under coupling between true triaxial field (maximum principal σ 1 > intermediate 2 minimum 3) pressure field. In this paper, adsorption seepage experiments are conducted through self-developed 'gas-solid' coupled mass...

Based on the fluid-solid coupling theory, The fractured rock mass was described as a continuous porous medium, and consider permeability coefficient has relationship with stress strain. dynamic change of achieved using multi-physics analysis software COMSOL, found that strain surrounding rocks changes lot due to mining. maximum in mudstone area reaches 2-3 times original one, which happened at immediate roof mined-out area. According seepage field, mining does not destroy water resistance...

In order to study the axial compression performance of GFRP tube composite columns filled with concrete and better applied engineering, influence different winding angle tube, thickness strength containing rate steel are simulated by using finite element analysis software ABAQUS when column under ,The results show that: numerical in good agreement experimental results; reduced angle, increasing thickness, improve core an increase could bearing capacity columns.

In the steeply inclined and extremely thick coal seams (SIETCS) mined using horizontal sublevel top-coal caving (HSTCC) method, uncertainty of gas emission is a safety threat to mining operations. order reduce occurrence accidents, determination crucial. this paper, we first proposed prediction model for workers at floor coalbed calculate on site. We then put forward finite-element numerical simulation researchers predict from coalbed. At last, measured emitted SIETCS in Wudong Coal Mine...

This paper is based on the basic principles of extended finite element in large commercial software ABAQUS platform different fracture energy three point bending test concrete are numerically simulated, and three-point crack initiation, through expansion path analysis. The results show that has a direct impact size specimens destruction, Fracture brittle can be small more obvious, produce harmful. When softening decline stage after peak stress occurred "jump back" phenomenon.

In this presented work, a coupled thermo-mechanical model is employed to analyze the behavior of ceramic functionally graded materials (FGMs) and crack formation propagation process coating was simulated step in by using RFPA (Realistic Failure Process Analysis) 2D -Thermo code. The thermal shock fracture discussed based on basis morphology elucidated mechanism deformation propagation. state change from compression tension whose magnitude large enough exceed strength causes vertical crack....

Manifold learning obtains a low-dimensional representation of an underlying Riemannian manifold supporting high-dimensional data. Kernel density estimates the embedding with fixed bandwidth fail to account for way algorithms distort geometry manifold. We propose novel distortion-corrected kernel estimator (DC-KDE) any embedding, that depends on estimated metric at each data point. Exploiting geometric information leads more accurate estimation, which subsequently could be used anomaly...

In the steeply inclined and extremely thick coal seams (SIETCS) mined using horizontal sublevel top-coal caving (HSTCC) method, uncertainty of gas emission is a safety threat to mining operations. order reduce occurrence accidents, determination crucial. this paper, we first proposed prediction model for workers at floor coalbed calculate on site. We then put forward finite element numerical simulation researchers predict from coalbed. At last, measured emitted SIETCS in Wudong Coal Mine...

According to the seam floor aquifer inhomogeneity,in order analysis coal deformation and failure law in pressurized water ,this paper established mechanical model of nonuniform pressure fluidstructure interaction models,using numerical simulation software FLAC3D inrush regularity .Analyzing extent damage from floor, stress displacement when working face promote different distances, this carried out basic rules mining inrush. This study shows that by monitoring position bottom occurs easily,...

Based on the concrete plasticity damage model provide by Abaqus, subroutine PQ-fiber provided TsingHua University was used to build and simulation for steel plate reinforced (SPRC) coupling beams. The embedded column stress nephogram, nephogram hysteresis curve which get after were compared with actual test, results can fit test better, some userful reference numerical study

This paper is mainly based on the basic principle of extended finite element ,in large commercial software abaqus platform dynamic load eccentric mixed-mode concrete failure process are numerically simulated, results showed that crack together under tension and shear ,crack extension direction cracks was obvious deflection, in good agreement with physical experiments, also shows fracture problems have very advantage.