22 Result(s)
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Article
Assessing the range of blasting-induced cracks in the surrounding rock of deeply buried tunnels based on the unified strength theory
Blasting-induced cracks in the rock surrounding deeply buried tunnels can result in water gushing and rock mass collapse, posing significant safety risks. However, previous theoretical studies on the range of ...
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Article
A hydro-mechanical coupling model for predicting infiltration and ponding in unsaturated soils
Unsaturated soils are extensively encountered in nature and engineering practice. Understanding the hydromechanical coupling effects in the infiltration process of an unsaturated porous medium is of considerab...
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Article
Stability Analysis of Deep Rectangular Tunnels Using Adaptive Finite Element Limit Analysis with Hoek–Brown Failure Criterion
The purpose of this study is to investigate the stability of deep rectangular tunnels excavated in a jointed rock mass using adaptive finite element limit analysis (AFELA) method. The rock mass is assumed to o...
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Article
True triaxial hydraulic fracturing test and numerical simulation of limestone
Hydraulic fracturing, as a key technology of deep energy exploitation, accelerates the rapid development of the modern petroleum industry. To study the mechanisms of hydraulic fracture propagation and rock fai...
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Article
Compressive Characterization of Hemp Fiber–Epoxy Matrix Composite for Lightweight Structures
Renewable green reinforcement resources are gaining in importance as environmental awareness is increasing. Natural fiber-reinforced composites have potential for use in several automotive parts. The present w...
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Article
Limit variation analysis of shallow rectangular tunnels collapsing with double-layer rock mass based on a three-dimensional failure mechanism
In the framework of upper bound theorem of limit analysis, the progressive collapse of shallow rectangular tunnels with double-layer rock mass has been theoretically analyzed based on the three-dimensional (3D...
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Article
Preliminary assessment of revegetation potential through ryegrass growing on bauxite residue
Bauxite residue (BR), a by-product of the industrial production of alumina, has raised environmental concerns in the last decades, due to the presence of high amounts of alkali and various heavy metal ions. Li...
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Article
Variation analysis of ultimate pullout capacity of shallow horizontal strip anchor plate with 2-layer overlying soil based on nonlinear M-C failure criterion
Based on the nonlinear Mohr-Coulomb failure criterion and an associated flow rule, a kinematic admissible velocity field of failure mechanism of the 2-layer soil above a shallow horizontal strip anchor plate i...
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Article
Upper bound analysis of ultimate pullout capacity of shallow 3-D circular plate anchors based on nonlinear Mohr-Coulomb failure criterion
Based on the nonlinear Mohr-Coulomb failure criterion and the associated flow rules, the three-dimensional (3-D) axisymmetric failure mechanism of shallow horizontal circular plate anchors that are subjected t...
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Article
Kinetics of Rare Earth Extraction from Baotou Bastnaesite in Hydrochloric Acid and Aluminum Chloride
In this paper, the leaching kinetics of rare earth from Baotou bastnaesite in a HCl–AlCl3 solution was investigated. In addition, the effects of the HCl and AlCl3 concentrations, liquid to solid ratio, stirring s...
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Article
Influence of tribofilm on superlubricity of highly-hydrogenated amorphous carbon films in inert gaseous environments
In this study, we mainly focus on the structural morphology and inter-atomic bonding state of tribofilms resulting from a highly-hydrogenated amorphous carbon (a-C:H) film in order to ascertain the underlying ...
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Article
Solubilization of aluminum phosphate by specific Penicillium spp.
The solubilization of hardly soluble aluminum phosphate (AlPO4) by specific Penicillium spp. isolated from wheat rhizospheric soils was investigated in Pikovskaya agar and liquid medium, respectively. Most of the...
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Article
Theoretical study on Manson-Coffin equation for physically short cracks and lifetime prediction
The Manson-Coffin equation has been widely applied to the prediction of fatigue lifetime. But this equation does not explicitly express the relation between the fatigue lifetime and the crack length. The prese...
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Article
Characteristics of the Lower Yellow River channel shrinkage and its discriminant parameters
This paper analyzes the changing trends of the Lower Yellow River (LYR) transverse profile parameters and their aberrance points by the time series analysis method. Research results show that there has been a ...
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Article
Sediment delivery ratio and its uncertainties on flood event scale: Quantification for the Lower Yellow River
Sediment delivery ratio (SDR) for fluvial rivers was formulated with sediment rating curve. The observed data of SDR on flood event scale of the Lower Yellow River (LYR) were adopted to examine the formulation...
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Article
Effect of suspended sediment grain size on channel sedimentation in the lower Yellow River and some implications
Based on the data of suspended sediment transport and channel sedimentation in various grain size fractions in the period of 1962–1985, the relationship between channel sedimentation in the lower Yellow River ...
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Article
Analysis micro-mechanism of burrs formation in the case of nanometric cutting process using numerical simulation method
Burrs (exit failure), being one of the important factors influencing the final precision of workpiece, have been widely studied. Today, with the development of manufacturing technology, the depth of cut falls ...
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Article
Cranny density parameters and porosity measured by elastic wave method in quasi-isotropic cranny rock masses
According to the characteristic of elastic waves propagation in medium and the application of elastic waves method in rock mass engineering, the cranny mass with random crannies was regarded as quasi-isotropic...
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Article
Modeling sediment transport in the lower Yellow River and dynamic equilibrium threshold value
A major problem in the lower Yellow River is the insufficient incoming water and excessive sediment supply, which results in serious deposition, continuous rise of the river bed, and austere flood control situ...
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Article
Simulation of temperature distribution of point contacts in mixed lubrication
The numerical simulation of temperature distribution of point contacts in mixed lubrication is presented. The calculating includes two steps. First, temperature rises on two surfaces are obtained by a temperat...
