scholarly journals Folded fabric tunes rock deformation and failure mode in the upper crust

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
F. Agliardi ◽  
M. R. Dobbs ◽  
S. Zanchetta ◽  
S. Vinciguerra
Keyword(s):  
Failure Mode ◽  
Rock Deformation ◽  
Upper Crust ◽  
Deformation And Failure

Numerical Simulation on Drop Test of the Conical Shell

2010 ◽  
Vol 44-47 ◽  
pp. 2341-2345
Author(s):  
Yi Xia Yan ◽  
Wei Fang Xu ◽  
Xi Cheng Huang ◽  
Gang Chen ◽  
Zhi Ming Hao
Keyword(s):  
Numerical Simulation ◽  
Failure Mode ◽  
Conical Shell ◽  
Material Model ◽  
Drop Test ◽  
Constitutive Relationship ◽  
Plastic Behavior ◽  
Deformation And Failure ◽  
Conical Shells ◽  
Nonlinear Transient

The drop test for the thin 2A12 conical shells was developed on a drop hammer. The dynamical responses, typical deformation histories and failure mode of the shells were presented. The drop impact response of the thin conical shells were numerically simulated and analyzed in detail by using the explicit, nonlinear transient dynamic code, LS-DYNA. In the calculation, the material plastic behavior of the conical shells was described by Johnson-Cook constitutive relationship, which includes the effects of the strain rate, strains harden and temperatures soften. The deformation and failure model of the conical shell obtained from the numerical simulation were consistent well with the experiment. It was shown that the calculation method, material model and the failure criterion were available. The test and numerical simulation results were all shown that the failure mode was different because of the different drop height.

scholarly journals Acoustic Emission Behavior of Rock-Like Material Containing Two Flaws in the Process of Deformation Failure

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Quan-Sheng Liu ◽  
Jie Xu ◽  
Bin Liu ◽  
Jing-Dong Jiang
Keyword(s):  
Crack Initiation ◽  
Crack Coalescence ◽  
Rock Deformation ◽  
Crack Initiation And Propagation ◽  
Deformation And Failure ◽  
Initiation And Propagation ◽  
Final Failure ◽  
Emission Behavior ◽  
Ae Location ◽  
Acoustic Emission Behavior

Many sudden disasters (such as rock burst) by mining extraction originate in crack initiation and propagation. Meanwhile a large number of shock waves are produced by rock deformation and failure. With the purpose of investigating crack coalescence and failure mechanism in rock, experimental research of rock-like materials with two preexisting flaws was performed. Moreover, the AE technique and photographic monitoring were adopted to clarify further the procedure of the crack coalescence and failure. It reveals that AE location technique can record the moments of crack occurrences and follow the crack growth until final failure. Finally, the influence of different flaw geometries on crack initiation strength is analyzed in detail. This research provides increased understanding of the fracture mechanism of mining-induced disasters.

Roadway Anchor Support Design Method Based on the “Three Zones” of Roadway Roof

2014 ◽  
Vol 1073-1076 ◽  
pp. 2082-2087
Author(s):  
Zhi Gang Wang ◽  
Ling Fan Zhang ◽  
Da Zhang Zhang ◽  
Tian Bai Zhou ◽  
Zhi Hao Zhang
Keyword(s):  
Roof Rock ◽  
Design Method ◽  
Deformation Monitoring ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Fissure Zone ◽  
Support Design ◽  
Deformation And Failure ◽  
Roof Caving ◽  
Monitoring Result

Aiming at the problem of serious deformation and failure of the surrounding rock of the main roadways in diabase zone in west wing on-500m leve in Dongbaowei Coal Mine and roof caving occurring several times, the rupture characteristics of roadway roof rock was observed in this paper. And the observation result shows that the rupture of the roof rock of the roadways in diabase zone has obvious zoning characteristics, and the roadway roof rock is divided into three zones: fragmentation zone, fissure zone and intact rock zone. According to this, this paper introduced a new concept of controlling roadway roof subsidence and redesigned the support parameters of the roof of the roadway in diabase zone. The deformation monitoring of the testing roadway roof rock was carried out, and the monitoring result shows that the anchor supporting scheme which was based on the “three zones” of roadway roof could control the roof rock deformation better. This indicates that roadway anchor support design method which is based on the “three zones” of roadway roof is correct and feasible.

scholarly journals Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Yutao Li ◽  
Qingwei Guo ◽  
Xunchen Liu ◽  
Yaodong Jiang ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Spatial Distribution ◽  
Failure Mode ◽  
Failure Process ◽  
Elastic Strain Energy ◽  
Tensile Failure ◽  
Failure Behavior ◽  
Secondary Fracture ◽  
Deformation And Failure ◽  
Influence Mechanism

Both computed tomography (CT) and notched semicircular bend (NSCB) tests are performed for coals with high and medium bursting proneness to extract the scientific expression of pore-fracture and its influence mechanism on the tensile failure behavior. The acoustic emission (AE) parameters in the sample during loading and failure are monitored, and the influence mechanism of pore-fracture on tensile failure behavior of coal is analyzed. The result illustrates that the spatial distribution feature of the pore-fracture in coals with high and medium bursting proneness is extremely different. The deformation and failure mode of the coals are affected by many factors, loading mode, notch depth and width, mechanical properties of matrix and minal, spatial distribution feature of pore-fracture, etc. The influence of primary pore-fracture in the coal on the extension and penetration of the secondary fracture could be divided into two types: bifurcation and promotion, which would cause different local damage in the sample and affect the final failure mode. The feature of acoustic emission parameters indicates that the deformation and failure process of a sample under loading could be divided into four stages: compaction stage, elastic deformation stage, displacement plastic growth stage, and post peak failure stage, which is the result of comprehensive action of many factors. The evolution process of secondary fracture is accompanied by the dissipation of elastic strain energy and the intensification of internal damage of coal, which reflects the failure process of coal.

scholarly journals Reservoir Landslide Physical Modelling under Ice-Snow Melting and Reservoir Water Combined Action

2020 ◽  
Vol 2020 ◽  
pp. 1-21
Author(s):  
Tongqiang Xiong ◽  
Jianlin Li ◽  
Lehua Wang ◽  
Huafeng Deng ◽  
Xiaoliang Xu
Keyword(s):  
Failure Mode ◽  
Model Test ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Snow Melting ◽  
Reservoir Water ◽  
Infiltration Process ◽  
Deformation And Failure ◽  
Snow Water ◽  
Combined Action

Extreme ice-snow melting in winter affects the infiltration process of snow water on the slope surface significantly and plays an important role in the deformation stability of landslide. Variation in pore water pressure is regarded as an essential factor of landslide instability induced by snow water. In order to figure out the internal relationship between the infiltration process of snow water and the failure mode of deformation and instability of the accumulation landslide, the response law and deformation and failure mode of pore water pressure and soil pressure of landslide accumulation under different ice-snow melting conditions are deeply studied based on the indoor large-scale landslide model test. We have studied the physical model test under the combined action of reservoir water and ice-snow melting. It reveals the seepage erosion deformation and failure mechanism. It undoubtedly provides references of great importance for the geological hazard governance of bank slope in the Three Gorges Reservoir Area.

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