Stability Analysis for Pillars during the Process of Panel Mining Based on Dynamic Fuzzy Reliability

2011 ◽  
Vol 120 ◽  
pp. 263-268
Author(s):  
Shi Jiao Yang ◽  
Hui Luo ◽  
Jian Yong Dai ◽  
Chang Zhen Wu
Keyword(s):  
Strain State ◽  
Fuzzy Reliability ◽  
Pillar Stability ◽  
Performance Function ◽  
Material Parameters ◽  
Entire Process ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Finite Element Numerical Simulation ◽  
The Stability

Panel mining requires constructing lots of artificial pillars in underground metal mines. Along with the development of the mining process the stress-strain state of pillars changes constantly. Finite element numerical simulation with Midas/GTS software is used to analyze the stability of the pillar during the entire process of panel mining and consider randomness and fuzziness for material parameters of concrete and ore rock to get stress distribution in the pillar. In this paper, the performance function and equation of dynamic fuzzy reliability for a pillar in the whole mining process are established and are solved by a program developed with the MATLAB software. Applying the proposed theory and procedures to dynamic fuzzy reliability analysis and calculation of the pillar was set in panel mining under complex conditions in Zhao Tong Lead-Zinc mine. The results indicate that dynamic fuzzy reliability can better reflect the pillar stability during the entire process of panel mining and the proposed theory and procedures are effective in evaluating the dynamic fuzzy reliability.

Fuzzy Reliability Analysis of Geocell Protective Slope Stability

2012 ◽  
Vol 166-169 ◽  
pp. 1917-1921 ◽  
Author(s):  
Guang Yue Wang ◽  
Yan Han
Keyword(s):  
Probability Density Function ◽  
Failure Probability ◽  
Soil Property ◽  
Structural Performance ◽  
Reliability Model ◽  
Fuzzy Reliability ◽  
Performance Function ◽  
Stability Of Slope ◽  
The Stability ◽  
Calculated Model

In order to analyze the uncertainty existing in the stability of slope with geocell, the fuzziness of soil property parameters should be considered. In this paper, probability density function of structural performance function and membership function of the stability of slope with geocell was determined. The fuzzy reliability model of the stability of slope with geocell was established. The fuzzy reliability and fuzzy failure probability of slope with geocell instability were calculated, and the practicability of the calculated model was verified.

scholarly journals Determination of Intervening Pillar Thickness Based on the Cusp Catastrophe Model

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Shaowei Ma ◽  
Zhouquan Luo ◽  
Jianhua Hu ◽  
Qifan Ren ◽  
Yaguang Qin ◽  
...  
Keyword(s):  
Catastrophe Theory ◽  
Plate Theory ◽  
Sufficient Conditions ◽  
Cusp Catastrophe ◽  
Minimum Thickness ◽  
Lead Zinc ◽  
Zinc Mine ◽  
The Stability ◽  
Necessary And Sufficient ◽  
Cusp Catastrophe Theory

For the stability of the intervening pillar of the sublevel drilling open-stope subsequent filling mining method, the multifactor stability mechanical model of the intervening pillar under two different constraint conditions (Model 1 and Model 2) was established based on the elastic thin plate theory. Then, the cusp catastrophe equation and the necessary and sufficient conditions for the instability of the intervening pillar under two different constraint conditions were obtained by using the cusp catastrophe theory. Furthermore, the minimum thickness formula for the intervening pillar without instability under two different constraint conditions was derived, and the relationships between the minimum thickness of the intervening pillar and the factors, including the depth of the stope, the inclination of the orebody, the thickness of the orebody, the height of the stage, the length of the stope, and the mechanical properties of the orebody, were analyzed. Finally, the formula was used in the design of an intervening pillar between stopes 4-1 and 4-2 in Panlong Lead-Zinc Mine. The designed thickness of the pillar was 6.01 m by calculation, its actual thickness was 6.35–7.25 m in the mining process, and its average thickness was 6.5 m. Compared with the previously designed thickness of 7-8 m at the same stage, the pillar was 0.5–1.5 m smaller, which more effectively improved the recovery rate of the ore under the premise of ensuring the stability of the intervening pillar. This example of industrial application proves that it is feasible to use the cusp catastrophe theory to analyze the stability and parameter design of the intervening pillar under different constraints.

Light-Induced Metastable Defects in a-Si:H: Towards an Understanding

1985 ◽  
Vol 49 ◽  
Author(s):  
Martin Stutzmann ◽  
Warren B. Jackson ◽  
Chuang Chuang Tsai
Keyword(s):  
Amorphous Silicon ◽  
Mechanical Stress ◽  
Hydrogenated Amorphous Silicon ◽  
Material Parameters ◽  
Kinetic Behaviour ◽  
Proposed Model ◽  
Special Cases ◽  
The Stability ◽  
Hydrogenated Amorphous

AbstractThe dependence of the creation and the annealing of metastable dangling bonds in hydrogenated amorphous silicon on various material parameters will be discussed in the context of a recently proposed model. After a brief review of the kinetic behaviour governing defect creation and annealing in undoped a- Si:H, a number of special cases will be analyzed: the influence of alloying with O, N, C, and Ge, changes introduced by doping and compensation, and the role of mechanical stress. Finally, possibilities to increase the stability of a-Si:H based devices will be examined.

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