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Article
Numerical Study of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM
Elucidating the flow features around piles in local scouring processes is crucial for studies of local scouring mechanisms and scour depth estimates. This study details the flow turbulence characteristics of t...
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Article
Experimental Investigation on the Effects of Microwave Irradiation in Pore Structures of LN2 Freezing Coal for Coalbed Methane Extraction
Liquid nitrogen (LN2) fracturing, an effective method in stimulating reservoirs, contains freezing and thawing. In general, frozen rocks are air-thawed in past studies. Microwave fracturing not only enhances pore...
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Article
Mechanical response and failure pattern of a modified mixed compression-shear experiments based on acoustic emission and numerical simulation
There is potential danger of conical shear failure surface in karst cave roof under pile foundation load. To understand the mechanical and failure characteristics of rocks under such conditions. In this study,...
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Article
Permeability Evolution of Coal Seam Roof Sandstone Under Thermal Treatment
The permeability evolution for coal seam roof overburden subjected to high temperature plays a significant role in efficient, clean, and safe production of underground coal gasification. This paper proposes an...
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Article
Study on Fracture Surface Damage and Fluid Flow Characteristics of Hot Dry Rock with Different Failure Modes under Repeated Thermal Shock
In the process of geothermal energy exploitation, the fracture surface of hot dry rocks (HDRs) is easily damaged by repeated injection of cold water. To reveal the damage and flow characteristics of granite fr...
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Article
Study on the damage characteristics of concrete-rock composite after exposure to high-temperature environments using nuclear magnetic resonance
In this paper, nuclear magnetic resonance (NMR) and mechanical tests of rock and concrete after exposure to different high-temperature conditions have been conducted in the laboratory. The results indicate tha...
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Article
A New Close-Form Solution for Elastoplastic Seepage-Induced Stresses to Circular Tunnel with Considering Intermediate Principal Stress
Based on the DP (Drucker–Prager) yield criterion, a new semi-analytical method for hydraulic–mechanical coupling in circular tunnels is proposed which takes into account the evolution of the permeability coeff...
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Article
Study on the stability and disaster mechanism of layered soil slopes under heavy rain
Under the influence of rainfall, the failure mechanism and stability of layered slopes is one of the current hot topics. This paper aims to examine the influence of rainstorm conditions on the stability of lay...
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Article
Analysis of the Microscopic Evolution of Rock Damage Based on Real-Time Nuclear Magnetic Resonance
Under the action of a load, internal pores and cracks expand, and irreversible plastic deformations occur. Compared with conventional rock mechanics tests, nuclear magnetic resonance (NMR) can characterize the...
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Article
Open AccessAcoustic emission characteristics and damage evolution of basalt by microwave irradiation
The microwave-assisted rock breaking technology has been proven to be feasible, and has received considerable attention in the field of civil and mining engineering. A copper foil was used to wrap basalt to si...
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Article
Strain Evolution and Fatigue Damage Characteristics Analysis of Sandstones During Multi-Level Triaxial Cyclic Loading and Unloading Under Varying Stress Limits
Periodical cyclic loads are often encountered in the construction and operation stages of geotechnical engineering. In the paper, multi-level triaxial cyclic loading and unloading (TCLU) compression tests are ...
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Article
Energy Evolution Characteristics of Sandstones During Confining Pressure Cyclic Unloading Conditions
Periodical cyclic loads are often sustained in actual engineering. In this paper, the mechanical properties, energy density parameters characteristics and energy evolution patterns of sandstone under confining...
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Article
A Stratified NMR-Based Investigation of Spatial Evolution of Pore Structure in Sandstone After Cyclic Heating and Local Water Cooling
This investigation aimed at the effects of local water-cooling shock on the physical properties and analyzed the spatial evolution of pore structure by stratified nuclear magnetic resonance technology. We set ...
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Article
Influence of multiple porous structure evolution on physical–mechanical properties and damage mechanism of sandstone heated continuously/periodically with the identical heating time
This paper studied the physical–mechanical properties and damage mechanism based on porous structure evolution after continuous/periodic heating with identical 10 h of heating. Nuclear magnetic resonance was u...
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Article
Investigation of the mechanical behavior and continuum damage model of sandstone after freezing–thawing cycle action under different immersion conditions
This study systematically investigated the influence of freezing–thawing (F-T) cycles on the physical and mechanical properties by using scanning electron microscope (SEM), acoustic emission (AE) equipment, an...
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Article
Isotopic and Hydrogeochemical Evidence of Modern Water Recharge of Freshwater Lens in the Ningbo Coastal Plain Along Concealed Faults
Most of the freshwater in the aquifers in the Ningbo Basin has been replaced or mixed with seawater due to transgressions during the Late Pleistocene and Holocene. Only one freshwater lens has been preserved i...
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Article
Experimental investigation of fracture behavior of rock-like materials containing 3D embedded flaws subjected to direct and unloading normal stress shear action
In this study, a new method for generating embedded flaws in rock-like material samples is proposed. A series of shear tests are carried out on samples with one or two embedded penny flaws to research the crac...
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Article
Effect of Unloading Rate on the Mechanical Behavior and Fracture Characteristics of Sandstones Under Complex Triaxial Stress Conditions
In recent years, many studies have shown that it is meaningful to place rocks under stress paths corresponding to various loading and unloading conditions. However, the deformation evolution of rock under cycl...
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Article
Experimental investigation of triaxial compression and permeability of gritstone in geothermal environment
In this paper, the characteristics of microscopic failure and macroscopic mechanics of gritstone are studied experimentally under geothermal conditions. Different hydrothermal and cooling treatments are conduc...
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Article
Simulation of Underground Freshwater Exploitation and Analysis of Environmental Impact in Hangzhou Bay New Area, China
The Hangzhou Bay New Area is located in a coastal plain area where the groundwater storage environment is relatively fragile and lacks water resources. Recognizing the regularity of groundwater circulation in ...
