Abstract In this paper, the micromorphic approach, previously developed in mechanical context is applied to heat transfer and shown deliver new generalized equations as well nonlocal effects. The latter are compared existing formulations: classical Fourier conduction, hyperbolic type with relaxation time, gradient of temperature or entropy theories, double model, micro-temperature model micro-entropy models. A pair thermodynamically-consistent derived from appropriate Helmholtz-free energy...

A state-dependent critical state model is employed to analyze strain localization of sand in this paper. The developed based on the concept for sands, and an analysis performed drained plane tests Hostun sand. results show that capable simulating effect initial compatibly.

The large amount of coal mining activity in the arid region northwestern China leads to vegetation degradation and a greater probability strong winds. characteristics windy fields directly affect sand-dust transportation process. To capture wind field area, numerical simulation computational fluid dynamics (CFD) was conducted using Reynolds-Averaged Naiver-Stokes (RANS) turbulence model based on open source software OpenFOAM，taking Xinxing Coal Mine Wuhai, Inner Mongolia, as an example. test...

Classical coaxial plasticity constitutive models implicate an inevitable limitation that directions for principal stress and plastic strain increment are always coaxial. They not capable of simulating non-coaxial phenomena during the rotation axis. In this paper, a three-dimensional, model sands with modification Lade angle dependent shape function is introduced to describe behavior under axes rotation. A series numerical simulations hollow cylindrical torsional shear tests performed. The...

At present the majority of EPIRB (emergency radio show bit ship-standard) system used in whip antenna wave fluctuations work, work performance will be affected and this cause alarm signals' reception problems, so it's difficult to position signal transmitter's location accurately. The subject using CST software design then analyzing, comparing structural characteristics, parameters performances rectangular loop antenna, micro strip spiral has gain a new 1.6GHz antenna. antennas meet...

Based on shallow parallel underground tunnel and double-line shield of Jinan Rail Transit Line R3, this paper proposes two reinforcement measures including bored piles curtain grouting in the middle tunnel, making a numerical analysis comparison effect. The results show that influence later construction deformation earlier can be effectively reduced after taking respectively effect is better.

Aiming at the limitation of traditional constitutive theories which can not explain decrease inclination angle shear bands correctly when confining pressure increases, a state-dependent critical state model is employed to analyze strain localization Hostun sands. Firstly, formulation and parameters are calibrated through available drained triaxial test results sand. Then an analysis performed on plane tests. The show that capable simulating effect initial effective bands.

In order to study the dimensional influence of tunneling on adjacent pile foundation, successive segmental excavation is simulated considering geological background in Nanning. The different stiffness ratio and soil obtained by changing pile’s elastic modulus, radius or length. additional displacement inner force due are compared for ratio. Many useful conclusions can be drawn. Foundation settlement occurs top tunnel while upheaval arises below tunnel. range enlarged with distance from Pile...

In allusion to the limitation and roughness of soft rock classification by single index or experience. Seven important indices such as integrality coefficient, softening cohesion, spacing fracture, saturated uniaxial compressive strength rocky quality were chosen evaluate synthetically quantificationally using barycenter theory fuzzy set, whose membership function is Cauchy distribution weight fixed super weighting method. The deficiency losing information in judgment normal set was...

In the past many researchers studied dynamic stiffness and damping coefficients of surface embedded rigid foundations arbitrary shapes in elastic homogenous half space. Dynamic were obtained by using regularly shaped instead arbitrarily ones. Obviously, calculating methods not perfect. addition, two parameters mentioned above calculated only case a single foundation. But cases or more presented because interactions between considered all present papers. This paper eliminates faults named...

Abstract A series of pure principal stress rotation tests with dynamic hollow cylinder apparatus were conducted on saturated fine sand. The elastic torsional shear strain was reported to account for a large proportion the total strain, which could not be ignored. On this basis, non-coaxial angle is redefined and deformation characteristics influencing factors sand are studied. results show that will cause obvious plastic initial has more significant influence compared intermediate coefficient.

Three-dimensional stress path of foundation pit excavation considering deflection principal axis is deduced by numerical simulation. It found that the direction soil mass in varies greatly and on side approximate to axial shear. On this basis, a series undrained tests were carried out with hollow cylinder torsion shear apparatus (HCA) study deformation characteristics during pit. The test results show increase angle axis, stress-strain curve develops faster faster, positive strain components...

MIDSA/ GTS software is used to simulate the double track parallel shield construction. The influence of construction on existing tunnel under different small clear distance studied, and displacement plastic zone development law are summarized. analysis shows that subsequent excavation will cause clearance expansion vault subsidence tunnel, uplift deformation inverted arch surrounding rock further become larger. When only 0. 8 times diameter, reinforcement measures need be taken.