Failure mechanism and stability control technology of rock surrounding a roadway in complex stress conditions

2011 ◽  
Vol 21 (3) ◽  
pp. 301-306 ◽  
Author(s):  
Yang Yu ◽  
Jianbiao Bai ◽  
Ke Chen ◽  
Xiangyu Wang ◽  
Tongqiang Xiao ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Stability Control ◽  
Complex Stress ◽  
Stress Conditions ◽  
Control Technology

scholarly journals Experimental analysis of control technology and deformation failure mechanism of inclined coal seam roadway using non-contact DIC technique

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xianyu Xiong ◽  
Jun Dai ◽  
Yibo Ouyang ◽  
Pan Shen
Keyword(s):  
Coal Seam ◽  
Failure Mechanism ◽  
Stability Control ◽  
Surrounding Rock ◽  
Image Correlation ◽  
Engineering Practice ◽  
Control Technology ◽  
Support Design ◽  
Deformation Control ◽  
Geological Conditions

AbstractThe deformation and failure forms of inclined coal seam roadway under the joint action of dip angle and various geological conditions are complex, and there is a lack of targeted support measures, which brings great problems to the stability control of roadway surrounding rock. In order to safely and economically mine inclined coal seams, taking the engineering geology of Shitanjing No. 2 mining area as the background, and the physical similarity model of right-angle trapezoidal roadway in inclined coal seam, in which the non-contact digital image correlation (DIC) technology and the stress sensor is employed to provide full-field displacement and stress measurements. The deformation control technology of the roadway surrounding rock was proposed, verified by numerical simulation and applied to engineering practice. The research results show that the stress and deformation failure of surrounding rock in low sidewall of roadway are greater than those in high sidewall, showing asymmetric characteristics, and the maximum stress concentration coefficients of roadway sidewall, roof and floor are 4.1, 3.4 and 2.8, respectively. A concept of roadway "cyclic failure" mechanism is proposed that is, the cyclic interaction of the two sidewalls, the sharp angles and roof aggravated the failure of roadway, resulting in the overall instability of roadway. The roadway sidewall is serious rib spalling, the roof is asymmetric "Beret" type caving arch failure, and the floor is slightly bulging. On this basis, the principle of roadway deformation control is revealed and asymmetric support design is adopted, and the deformation of roadway is controlled, which support scheme is effective.

Failure behavior of multi-state system considering functional and physical isolation effects

2021 ◽  
pp. 1748006X2110418
Author(s):  
Ying Chen ◽  
Ze Wang ◽  
Yanfang Wang ◽  
Rui Kang
Keyword(s):  
Transition Probabilities ◽  
Functional Dependence ◽  
Great Difficulty ◽  
Complex Stress ◽  
State System ◽  
Stress Conditions ◽  
State Transitions ◽  
Failure Behavior ◽  
Physical Isolation ◽  
Isolation Effects

The multi-state system (MSS) is a system that may exhibit multiple states or performance levels. Most existing studies assumed that the transition probabilities from states to states are known. However, in practical engineering, the complex stress conditions lead to great difficulty of collecting the statistical data of state transitions. In this paper, based on physics-of-failure theory, we consider different levels of damages caused by failure mechanisms (FMs) are the main reasons to components’ multiple states. Besides, the physical isolation (PI) effect on degradations of FMs is also studied, which is neglected in the existing studies about the MSS with functional dependence groups. Decision-diagram based methods are used for modeling the failure behavior of the MSS. An automatic collision avoidance system is analyzed for illustrating the proposed modeling and analyzing methods. The results show that comparing to the results without the consideration of PI effect, the probabilities of different states with PI effect of multi-state components and system may decrease or increase, which depends on the actual PI effects to the stress conditions.

The Fatigue and Degradation Mechanisms of Wire Ropes Bending-over-Sheaves

2011 ◽  
Vol 127 ◽  
pp. 344-349
Author(s):  
Zhi Hui Hu ◽  
Ji Quan Hu
Keyword(s):  
Failure Mechanism ◽  
Fatigue Failure ◽  
Mechanical Damage ◽  
Wire Rope ◽  
Stress Conditions ◽  
Degradation Mechanisms ◽  
Bending Fatigue ◽  
Wire Ropes ◽  
Combined Action

Fatigue failure behaviors caused by wire ropes bending-over-sheaves are discussed in the paper. Stress conditions of wire ropes bending-over-sheaves and the mechanism of damage to wire rope caused by fleet angel and angle of wrap is analyzed, the fatigue failure mechanism of wire ropes is investigated in the paper. The investigation indicates that the load and the mechanical damage of ropes bending-over-sheaves is very complex, and the fatigue failure of ropes bending-over-sheaves is the result of combined action of bending fatigue and various kinds of damage. The research will have implications to design and use of wire rope.

scholarly journals Present Status and Prospect of High-Frequency Electro-hydraulic Vibration Control Technology

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Yi Liu ◽  
Tao Wang ◽  
Guofang Gong ◽  
Rujun Gao
Keyword(s):  
Vibration Control ◽  
High Frequency ◽  
Seismic Waves ◽  
Stability Control ◽  
Control Technology ◽  
Rotary Valve ◽  
High Frequency Vibration ◽  
Vibration Method ◽  
Waveform Distortion ◽  
Control Stability

AbstractElectro-hydraulic vibration equipment (EHVE) is widely used in vibration environment simulation tests, such as vehicles, weapons, ships, aerospace, nuclear industries and seismic waves replication, etc., due to its large output power, displacement and thrust, as well as good workload adaptation and multi-controllable parameters. Based on the domestic and overseas development of high-frequency EHVE, dividing them into servo-valve controlled vibration equipment and rotary-valve controlled vibration equipment. The research status and progress of high-frequency electro-hydraulic vibration control technology (EHVCT) are discussed, from the perspective of vibration waveform control and vibration controller. The problems of current electro-hydraulic vibration system bandwidth and waveform distortion control, stability control, offset control and complex vibration waveform generation in high-frequency vibration conditions are pointed out. Combining the existing rotary-valve controlled high-frequency electro-hydraulic vibration method, a new twin-valve independently controlled high-frequency electro-hydraulic vibration method is proposed to break through the limitations of current electro-hydraulic vibration technology in terms of system frequency bandwidth and waveform distortion. The new method can realize independent adjustment and control of vibration waveform frequency, amplitude and offset under high-frequency vibration conditions, and provide a new idea for accurate simulation of high-frequency vibration waveform.

scholarly journals Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine

2017 ◽  
Vol 27 (2) ◽  
pp. 245-252 ◽  
Author(s):  
Renshu Yang ◽  
Yongliang Li ◽  
Dongming Guo ◽  
Lan Yao ◽  
Tongmao Yang ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
High Stress ◽  
Soft Rock ◽  
Control Technology ◽  
Deep Mine ◽  
And Control
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