11 Result(s)
within
Chaolin Wang
Civil Engineering
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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
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
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
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
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
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
A Semianalytical Solution for a Griffith Crack Nonuniformly Pressurized By Internal Fluid
Unintentional variations of fluid pressure within a hydraulic fracture will disturb the surrounding stress state, affect the stability of fracture propagation and complicate the fracture intersections during t...
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Article
Analysis of the Pressure-Pulse Propagation in Rock: a New Approach to Simultaneously Determine Permeability, Porosity, and Adsorption Capacity
Permeability estimation from pressure-pulse decay method is complicated by two facts: (1) the decay curve often deviates from the single-exponential behavior in the early time period and (2) possible existence...
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Article
A New Criterion for a Toughness-Dominated Hydraulic Fracture Crossing a Natural Frictional Interface
Hydraulic fracturing is a powerful technology, especially in stimulating fluid production from reservoirs. However, the problem of the intersection between hydraulic fractures and natural fractures is inevitab...
