26 Result(s)
within
**anchun Li
Civil Engineering
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Article
Heating and Water Transport Behavior of Sandstones Under Microwave Irradiation
Microwave treatment has become a promising method to improve the efficiency of mechanical excavators in hard rocks. This paper conducted microwave irradiation tests on three water-bearing sandstones and analyz...
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Article
Assessing the Size Effect on Microwave Fracturing of Diorite Using a Dielectric-Loaded Converging Waveguide Antenna
Microwave fracturing and assisted mechanical breakage of rocks has been demonstrated to be efficient and cost-effective, holding great potential in rock excavation. However, the size effect on the fracturing p...
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Article
Dynamic Strength and Indentation Hardness of a Hard Rock Treated by Microwave and the Influence on Excavation Rate
Mechanical excavation in hard or very hard rocks is still challenging in rock engineering. One plausible solution is to reduce rock strength prior to mechanical excavation to increase excavation and cost-effic...
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Article
Open AccessNumerical investigation of the influence of casting techniques on fiber orientation distribution in ECC
Engineered cementitious composites (ECC), also known as bendable concrete, were developed based on engineering the interactions between fibers and cementitious matrix. The orientation of fibers, in this regard...
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Article
Transverse Cracking of Rock with a Dissimilar Inclusion Under Tension: Effect of Loading Rate and Inclusion Diameter
The rate-dependent tensile failure of rock with a cement inclusion was experimentally and numerically investigated to reveal the coupled dynamic response of inclusion-containing heterogeneous rock structures. ...
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Article
Heating-Dominated Fracturing of Granite by Open-Ended Microwave: Insights from Acoustic Emission Measurement
Microwave fracturing of hard rocks holds great promise in the civil, mining and tunnelling industries. The role of heating and cooling in the fracturing of rocks and when and where cracks initiate from and pro...
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Article
Feasibility of Artificial Materials in Simulating Rock Failure Based on Rate-Dependent Brittleness Indexes
With the development of 3D printing and computer numerical control machining techniques, extremely complicated models physically simulating the underground structures in rock engineering were conducted. Whethe...
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Article
A Novel Experimental Method to Investigate the Seismic Response of Rock Joints Under Obliquely Incident Wave
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Article
Experimental Study of S-wave Propagation Through a Filled Rock Joint
This experimental study proposes a Split Shear Plates model to investigate the effects of a filled joint on S-wave attenuation. A dynamic impact is used to create frictional slip and generate an incident S-wav...
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Article
Analytical Time-Domain Solution of Plane Wave Propagation Across a Viscoelastic Rock Joint
The effects of viscoelastic filled rock joints on wave propagation are of great significance in rock engineering. The solutions in time domain for plane longitudinal (P-) and transverse (S-) waves propagation acr...
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Article
Special Issue: Including Papers on “Rock Dynamics and Applications”
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Article
Load capacity prediction of in-service timber utility poles considering wind load
This paper presents a numerical investigation on the influence of different types of damage to the load capacity of in-service timber utility poles. Current design codes do not highlight a pole’s strength perf...
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Article
Separation of longitudinal and flexural wave in a cylindrical structure based on sensor arrangement for non-destructive evaluation
Low strain integrity testing is commonly used to assess the in situ condition of the poles or piles. For poles, it is important to calculate the embedment length and location of damage which is highly influenc...
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Article
Wave Propagation in the Vicinities of Rock Fractures Under Obliquely Incident Wave
Though obliquely incident plane wave across rock fractures has been extensively investigated by theoretical analysis, the quantitative identification of each wave emerged from fractures has not been achieved e...
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Article
Application of coupled analysis methods for prediction of blast-induced dominant vibration frequency
Blast-induced dominant vibration frequency (DVF) involves a complex, nonlinear and small sample system considering rock properties, blasting parameters and topography. In this study, a combination of grey rela...
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Article
Numerical Modeling of Wave Transmission Across Rock Masses with Nonlinear Joints
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Article
Parameter identification and sensitivity analysis of an improved LuGre friction model for magnetorheological elastomer base isolator
The recently-developed magnetorheological elastomer (MRE) base isolator can provide an instant change in the shear modulus and dam** property under applied magnetic field, which makes it as an ideal device f...
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Article
In Situ Stress Determination for Liquefied Petroleum Gas Storage Caverns by Hydraulic Tests on Pre-existing Fractures
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Article
Elastic wave modes for the assessment of structural timber: ultrasonic echo for building elements and guided waves for pole and pile structures
This paper presents the state-of-the-art of using non-destructive testing (NDT) methods based on elastic waves for the condition assessment of structural timber. Two very promising approaches based on the prop...
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Article
In situ assessment of structural timber using stress-wave measurements
This paper summarizes the test recommendations for in situ assessment of structural timber using stress wave measurements as developed by members of the RILEM Technical Committee AST 215 “In-situ assessment of...
