scholarly journals Coupling Model of Stress–Damage–Seepage and Its Application to Static Blasting Technology in Coal Mine

ACS Omega ◽  
2021 ◽  
Author(s):  
Jun Liu ◽  
Luwei Zhang ◽  
Yanzhao Wei ◽  
Zeping Wu
Keyword(s):  
Coal Mine ◽  
Coupling Model ◽  
Stress Damage

scholarly journals Electromechanical-Mode Coupling Model and Failure Prediction of CFRP under Three-Point Bending

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2007
Author(s):  
Ronghua Zhang ◽  
Lifu Zhang ◽  
Hongying Fang ◽  
Wuliang Yin
Keyword(s):  
Carbon Fiber ◽  
Electromechanical Coupling ◽  
Three Dimensional ◽  
Failure Prediction ◽  
Coupling Model ◽  
Polymer Materials ◽  
Three Point Bending ◽  
Conductivity Change ◽  
Electromagnetic Methods ◽  
Stress Damage

Carbon fiber reinforced polymer materials (CFRP) cause CFRP to bend or fail when subjected to external loads or impacts. In the case of static three-point bending, using the conductive properties of the carbon fiber inside the CFRP, the overall damage detection and failure prediction can be carried out by electromagnetic methods. The eddy current coil is used to realize real-time monitoring of damage, and the measured voltage value can be mapped to obtain the load of the sample. This paper conducts theoretical analysis and experimental verification, and obtains the relationship between CFRP stress damage and spatial conductivity change, and proposes a CFRP electromechanical coupling model under quasistatic three-point bending. Combined with the theory of electrically ineffective length, the CFRP three-point bending electromechanical coupling model was revised. Experimental results prove that the revised model can describe the load-conductivity change trend of three-dimensional braided CFRP more accurately, which provides a theoretical basis for monitoring the structural health of CFRP through electromagnetic methods.

scholarly journals Study of the Fracture Law of Overlying Strata under Water Based on the Flow-Stress-Damage Model

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Zhijie Wen ◽  
Suolin Jing ◽  
Yujing Jiang ◽  
Lei Tian ◽  
Jinhao Wen ◽  
...  
Keyword(s):  
Flow Stress ◽  
Coal Mine ◽  
Damage Model ◽  
Test System ◽  
Laboratory Simulation ◽  
Fractured Zone ◽  
Working Face ◽  
Geological Conditions ◽  
Stress Damage ◽  
Overlying Strata

To accurately detect the development height of the water flowing fractured zone (WFFZ) in the overlying strata of the working face after mining under water and to ensure the safety and reliability of coal mining, the coal seam located under Weishanhu Lake in the Jisan coal mine was used as the experimental system. A similar laboratory simulation and water injection-based fracturing test system were used with the working face before and after mining activity to calculate, quantitatively detect, and qualitatively analyze the development height of the WFFZ in the overlying strata. Meanwhile, a flow-stress-damage model and its criterion of fracture expansion were established based on the Mohr-Coulomb criterion, and the FLAC 3D software was used to simulate the deformation and failure of the overlying strata and the evolution of WFFZ during the mining process. The results showed that the height ranges of the WFFZ beneath Weishanhu Lake of the Jisan coal mine as established by the above three methods are 30-45 m, 30-48 m, and 30-50 m. In the process of mining, the caving zone and fractured zone are, respectively, subjected to tensile failure and shear failure. The development height of the water flowing through the fractured zone in the overlying strata is basically consistent with the range of the “breaking arch.” The flow-stress-damage model and its criterion of fracture expansion can be applied to the fracture law of overlying strata under water under similar geological conditions.

Stress–damage–flow coupling model and its application to pressure relief coal bed methane in deep coal seam

2011 ◽  
Vol 86 (4) ◽  
pp. 357-366 ◽  
Author(s):  
T.H. Yang ◽  
T. Xu ◽  
H.Y. Liu ◽  
C.A. Tang ◽  
B.M. Shi ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coupling Model ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Pressure Relief ◽  
Flow Coupling ◽  
Stress Damage

Cebu Coal Mine Tragedies: Print Media Effects on Policy Legislation

2017 ◽  
Vol 2 (2) ◽  
pp. 83-91
Author(s):  
Nestor Godofredo Ramirez ◽  
◽  
Marjurie Lourince Zanoria ◽  
Andre Mikhail Obierez ◽  
◽  
...  
Keyword(s):  
Media Effects ◽  
Coal Mine ◽  
Print Media
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