Last. Xiaoze Cheng(CNPC: China National Petroleum Corporation)H-Index: 2
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Abstract Aiming at the problems of difficult observation of rock damage mechanism and many influencing factors of rock-breaking process, the damage mechanism of particle water-jet coupling impact was studied. Based on SPH-FEM coupling algorithm, the numerical model of particle water-jet impact rock was established, and the mechanical properties of rock were characterized by JH-2 (Johnson Holmquist II) damage model. Then, damage evolution and failure effect under the impact of water-jet and parti...
In this study, the mechanisms of rock breakage are assessed using tunnel boring machine (TBM) disc cutters under bi-axial pressure. Sequential indentation tests were conducted on granite specimens using a tri-axial testing platform. The morphology and volume of the fractured surface were measured and analyzed using a three-dimensional surface profilometer. An analysis of rock breaking growth and efficiency was performed as well. When the minor confining pressure (σ1) is constant, the results sho...
Deep underground mines have high energy consumption due to the need to overcome the confining pressure. This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process. Following this, the results were further validate...
#1Hongxiang Jiang(CUMT: China University of Mining and Technology)H-Index: 4
#2Zenghui Liu(CUMT: China University of Mining and Technology)H-Index: 1
Last. Kuidong Gao(SDUST: Shandong University of Science and Technology)H-Index: 3
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Abstract To investigate the rock fragmentation mechanism and its influence factors under discontinuous water-jet impact, the fluid-structure coupled smoothed particle hydrodynamics (SPH) and finite element analysis (FEA) was used to simulate the rock fragmentation process. A rate-dependent constitutive model was adopted to describe the mechanical behavior of rock, and the shock equation of state was used to simulate the water-jet. The rock fragmentation statuses under continuous and discontinuou...
World energy resources are depleting at an alarming rate, and natural gas has been identified as an environmentally friendly energy resource, with shale gas being one option. However, the extremely low permeability of shale plays has caused them to fail to produce a commercially viable amount of gas. Therefore, appropriate production enhancement techniques, including hydro-fracturing, are required. This paper reviews the research on shale gas production enhancement using foam-based hydro-fractur...
The cohesive zone model (CZM) honors the softening effects and plastic zone at the fracture tip in a quasi-brittle rock, e.g., shale, which results in a more precise fracture geometry and pumping pressure compared to those from linear elastic fracture mechanics. Nevertheless, this model, namely the planar CZM, assumes a predefined surface on which the fractures propagate and therefore restricts the fracture propagation direction. Notably, this direction depends on the stress interactions between...
#1Songyong Liu(CUMT: China University of Mining and Technology)H-Index: 11
#2Xiaohui Liu(CUMT: China University of Mining and Technology)H-Index: 7
Last. Huifu Ji(CUMT: China University of Mining and Technology)H-Index: 4
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Abstract A new self-controlling hydro-pick, which can control water flow automatically, was designed based on hydrodynamic theory. Firstly, the balance of forces acting on the pick was shown to present the operating principle of it, specifically, the force exerted by the water pressure acting over an annual area of the pick. A rock-breaking test bed was developed to study the frictional resistance, dynamic response, flow and rock-breaking characteristics of the self-controlling hydro-pick. The r...
Abrasive waterjets are widely used in the fields of civil and mechanical engineering for cutting a great variety of hard materials including rocks, metals, and other materials. Cutting depth is an important index to estimate operating time and cost, but it is very difficult to predict because there are a number of influential variables (e.g., energy, geometry, material, and nozzle system parameters). In this study, the cutting depth is correlated to the maximum kinetic energy expressed in terms ...