In order to investigate the effect of fissure inclination on mechanical properties, deformation, and crack evolution surrounding rock in roadway, uniaxial compression experiments were conducted sandstone-like materials with prefabricated fissures. The high-speed camera DIC (digital image correlation) method employed analyze strain distribution specimen. results demonstrated that presence fissures reduces stress for initiation, intact specimens producing new cracks from about 75% peak...

In order to predict the physical characteristics of large vibrating screen from its scale-down model, similarity ratios frequency response functions, mode shapes, and dynamic stresses between prototype scale model are built according theory. The natural frequencies modal shapes extracted function by means tests, in which relative error is less than 9% consistent model. operating condition parameters including stress, displacement, velocity, acceleration were also measured conform criteria....

In order to investigate the influence of temperature, confining pressure, and preexisting fissure on creep characteristics rock mass, multistage experiments were performed shale‐like material, with under different temperatures pressures. The results showed that new microcracks generated propagated increase temperature in both uniaxial triaxial experiments, generation propagation most pronounced at 60°C least 20∼50°C experiments. restricted by pressure. Temperature had less strain rate...

Under investigation in this paper is an extended forced Korteweg-de Vries equation with variable coefficients the fluid or plasma. Lax pair, bilinear forms, and Bäcklund transformations are derived. Based on first-, second-, third-order nonautonomous soliton solutions Propagation interaction of solitons investigated influence also discussed: Amplitude first-order determined by spectral parameter perturbed factor; there exist two kinds solitons, namely elevation depression depending sign...

In this paper, destructive compression tests under the coupled influence of temperatures (20-60 °C) and confining pressures (0-7 MPa) were carried out on rock-like material with pre-existing crack to explore deformation strength characteristics. The stress-strain curves obtained. Meanwhile, correlations peak stress, strain, average Young's modulus results experiments indicate that, firstly, compressive decreased increased due cracks; combined effect initial cracks, temperature, pressure gave...

In order to study the influence of environmental factors on creep properties deep shale, a series tests black shales are performed under different conditions, including stress deviation, temperature, and chemical pH value. The these conditions shale is studied. results show that rate will grow with increase difference, acidity‐alkalinity. We get nonlinear model when = 4 T 30°C. critical difference no larger than 31.04 MPa value temperature By scanning after corrosion, we know effects...

Under investigation in this paper is a cubic-quintic nonlinear Schrödinger equation which can describe the propagation of ultrashort pulses an inhomogeneous optical fibre. Lax pair and conservation laws are constructed from integrability be verified. Through gauge transformation, spectral problem for converted to Ablowitz–Kaup–Newell–Segur problem. Nonautonomous solitons breathers derived based on Darboux transformation (DT), while nonautonomous rogue waves obtained via generalized DT....

In this paper, a mathematical model for describing the solid-fluid transformation of ice water is put forward based on special geometry cases. The correctness obtained verified through comparison with numerical analysis and experiments. good agreement indicates that available study water. theory derived in paper lays foundation research phenomena other materials may have important applications engineering areas such as rheology, creep, instability materials.

There are many paleosols embedded in the loess northern China, which were formed during warm humid periods occurring Pleistocene. These vary their degree of both pedogenesis and weathering, reflecting intensity climate duration period with such climate. Thus, it is considered that could give a clue to analysis paleoenvironments. The present study aims at presenting some supporting evidences stratigraphy chronology Chinese based on pedoJogical investigations paleosols. Paleosols beds from...

The work presented in this paper was conducted to quantify the relationship between pore characteristics and mechanical properties of white sandstone. study include tests carried out under coupling effects chemical corrosion, temperature, nuclear magnetic resonance, tests. Computer fractal theory employed describe growth pores sandstone same effect. A custom developed program code, MATLAB software platform, used for calculating growths when subjected effects. correlation computer dimension...

Effects of underlying uniform current on the nonlinear hydroelastic waves generated due to an infinite floating plate are studied analytically, under hypotheses that fluid is homogeneous, incompressible, and inviscid. For case irrotational motion, Laplace equation governing equation, with boundary conditions expressing a balance among hydrodynamics, current, elastic force. It found convergent series solutions, obtained by homotopy analysis method (HAM), consist wave profile velocity...

The degree of weathering varies from one paleosol to another and it reflects the paleoenvironment under which a was formed. Therefore, an attempt made estimate paleosols quantitatively, on basis method proposed by ARAKI KYUMA (1985). data necessary for use (total contents major elements, quartz sand contents) were obtained presented in this previous papers. results revealed that terms “Weathering Index” generally parallels pedogenetic development. A vertical plot Weathering Index loess along...

Abstract In order to investigate the effect of fissure and temperature on deep-seated rock, uniaxial compression experiments were conducted rock-like material with different angle at temperatures. We investigated influence strength failure mode rock. Also, we simulated experiment ABAQUS. The results simulations confirmed that decreased increasing temperatures first then increased angle. crack initiation started from tips pre-existing could speculate via simulation reason was stress...

This paper describes the digital earth technology and its core technology-"3S" integration technology. The advance promotion of "3S" provide more favorable means technical support for Chinese medicine resources survey, evaluation appropriate zoning. Grid is a mature popular that can connect all kinds information resources. author sums up application in research traditional recent years, proposes new method route investigation resources, zoning suitability assessment by combining grid.

In this paper, the dissipative characteristics of unsteady heat conduction process for one-dimensional sphere is studied. The dissipation function can be regarded as a Lyapunov system, which determines evolution direction system and stability steady state. By use vector formula, relationship between thermal potential derived, its similarity with mechanical energy shown. expression obtained when boundary temperature fixed. addition, an example optimization discussed based on entransy extremum...

The phenomenon of winter snow, the collapse deep soft rock roadway, tumble plateau permafrost and erosion chocolate cheese are closely related to our daily life, all involve transformation between solid fluid, which makes study on theory solid-liquid conversion materials full importance value application. In this paper, taking content potassium chloride as an independent variable, through ice melting experiments effect rate, results show that with increase content, rate gradually...

Abstract In order to study the effects of chemical solution erosion and freeze-thaw cycles on physical parameters mechanical properties rocks, sandstone samples from central Shandong Province were taken as research objects. The cycle test uniaxial compression carried out for rock eroded by 0.01mol/L H2SO4 solution, NaCl NaOH respectively. results show that mass loss porosity different solutions increase with cycles, peak strength elastic modulus decrease exponentially cycles. damage degree...