Qingsheng Bai
Freiberg University of Mining and Technology
Coal miningGeologyEngineeringLongwall miningMining engineeringDiscrete element methodPermeability (earth sciences)Geotechnical engineeringMaterials scienceRoofOverburdenNumerical modelingCompressive strengthExcavationRock mass classificationFracture (geology)Computer simulationCoalSpallAquiferPetroleum engineeringStress (mechanics)
36Publications
14H-index
767Citations
Publications 27
Newest
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
#2Zhenghe Liu (TUT: Taiyuan University of Technology)H-Index: 1
Last. Fangtian Wang (CUMT: China University of Mining and Technology)H-Index: 12
view all 4 authors...
Abstract In this study, hydromechanical hybrid finite-discrete element method (FDEM) models were employed to investigate hydraulic fracturing from oriented perforations at the microscale. Numerical calibrations were first used to obtain the microproperties that can represent the realistic behavior of sandstone. The fracture morphology and breakdown pressure obtained from the numerical hydraulic fracturing show reasonable agreements with the experimental results, indicating that the numerical res...
1 CitationsSource
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
#2Shihao Tu (CUMT: China University of Mining and Technology)H-Index: 19
Roof failure related to laminated and jointed rock masses has been recognized as a major cause of fatalities in underground coal mines. This paper presents numerical simulations of the failure of a laminated and jointed roof using the discrete element method, while focusing on the initiation and propagation of (and the interactions between) microcracks and macroscopic fractures and the development of the associated damage, stress and deformation in the laminated and jointed roof. Numerical model...
2 CitationsSource
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
#2R. Paul Young (U of T: University of Toronto)H-Index: 2
Investigations on the Posiva Olkiluoto spalling experiment (POSE) at the nuclear waste disposal site in Olkiluoto, western Finland, have revealed that the presence of anisotropic veined gneiss (VGN) could affect the evaluation of spalling/damage strength of the host rock. In this study, the mechanical and damage behaviors of anisotropic VGN during complex true-triaxial in situ stress path loading is numerically investigated, considering the lifetime stress evolution of POSE. Overall, the discret...
5 CitationsSource
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 1
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
Last. R. Paul Young (U of T: University of Toronto)H-Index: 2
view all 4 authors...
Underground excavation causes rock damage, affecting its stability and fluid transport properties. Traditional experiments usually use loading regime (compressive tests) to damage the sample. However, they cannot mimic realistic in situ conditions where excavation unloading also plays a significant role. In the study, we conducted a true-triaxial acoustic emission (AE) experiment to simulate excavation-induced damage by applying in situ 3D stress path to a sample. The path originating 1.0 cm fro...
6 CitationsSource
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
#2Shihao Tu (CUMT: China University of Mining and Technology)H-Index: 19
Last. Fangtian Wang (CUMT: China University of Mining and Technology)H-Index: 12
view all 3 authors...
One of the most challenging problems in longwall top coal caving is the top coal cavability. Stone bands, which are usually found in thick coal seams, have shown adverse effects on top coal fragmentation and cavability. Understanding the characteristics of the stone band caving process is a primary step in evaluating top coal cavability in such conditions. In this study, a series of laboratory tests was implemented to find an appropriate construction material that can truly display the whole cav...
10 CitationsSource
#1Fangtian Wang (CUMT: China University of Mining and Technology)H-Index: 1
#1Fangtian Wang (CUMT: China University of Mining and Technology)H-Index: 1
Last. Mandadige Samintha Anne Perera (University of Melbourne)H-Index: 34
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Although the growth in global coal consumption has been sharply slowed with the falls in China offset to a greater extent by the increasing demand in India and other emerging Asian countries, coal still remains the largest source of energy for the world with a share of almost 30% by 2040 [1]. Mining industry plays an important role in extracting underground resources, including coal [2]. However, a large number of disastrous mine accidents, such as flood, water inrush, tunnel collapse, gas outbu...
1 CitationsSource
#1Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
#2Shihao Tu (CUMT: China University of Mining and Technology)H-Index: 19
It is believed that underground longwall mining usually produces fractures in the surrounding rocks. On the one hand, mining-induced fractures not only degrade the strength of the rock mass but also serve as main channels for fluids (e.g., water and methane). Fractures facilitate the failure of the rock mass and fluid inrush into working spaces. Therefore, mining-induced fractures are significant for the safety evaluation of underground structures and finding feasible solutions. On the other han...
25 CitationsSource
#1Lei Zhang (CUMT: China University of Mining and Technology)H-Index: 12
#2Zhiwei Ye (CUMT: China University of Mining and Technology)H-Index: 3
Last. Chen Wang (CUMT: China University of Mining and Technology)H-Index: 6
view all 6 authors...
Knowledge of the gas sorption characteristics of a coal not only helps to explain the mechanism of enhanced coalbed methane recovery but also provides an important basis for simultaneous coal and g...
6 CitationsSource
#1Dingyi Hao (CUMT: China University of Mining and Technology)H-Index: 4
#2Lei Zhang (CUMT: China University of Mining and Technology)H-Index: 12
Last. Chen Wang (CUMT: China University of Mining and Technology)H-Index: 6
view all 7 authors...
Moisture content in coal is an important factor affecting the coal seam gas extraction. It directly affects the storage and flow of gas in bituminous coal. In this paper, the cylindrical bituminous coal cores of Xutuan coal mine in Huaibei coal mine group were studied as experimental objects, using the laboratory self-designed experimental device Gas Adsorption and Strain Testing Apparatus system. The influence of the bituminous coal moisture content on gas adsorption characteristics was studied...
2 CitationsSource
#1Cun Zhang (CUMT: China University of Mining and Technology)H-Index: 16
#2Shihao Tu (CUMT: China University of Mining and Technology)H-Index: 19
Last. Qingsheng Bai (CUMT: China University of Mining and Technology)H-Index: 14
view all 3 authors...
Discrete element method (DEM) has been extensively used for studying the properties of rock mass through numerical simulation, which includes bonded particle (or grain) model method (BPM) and discrete fracture network method. In this paper, utilization of BPM for modeling uniaxial compressive strength (UCS) of lithophysal rock is explored and associated stages are discussed and calibrated including generation of particles, sample scale, loading method, macro- and micro-parameters of BPM. In orde...
7 CitationsSource