Assessment of the risk of loss of stability of the steel arch support of the underground excavations

Mining of Sustainable Development

生态环境科学

Duz, S.^1 ; Cholewa, M.^2

Silesian University of Technology, Faculty of Mining and Geology, 2 Akademicka Street, Gliwice

44-100, Poland^1

Polska Grupa Górnicza S.A., Oddzial KWK Ruda, 160 Halembska Street, Ruda laska

41-711, Poland^2

关键词: Loss of stability;    Parameters characterizing;    Probabilistic methods;    Probabilistic structures;    Probability of failure;    Technological factors;    Underground excavation;    Upper silesian coal basins;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/261/1/012008/pdf
DOI  :  10.1088/1755-1315/261/1/012008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The stability of underground excavations depends on many natural, mining, technical and technological factors. The conducted research has shown that the data accepted for design are often characterized by considerable variability both in time and in space. In order to take into account the variability of parameters characterizing the conditions of maintaining the excavation stability, the probabilistic structure analysis method was used in which the probability of failure was assumed as the risk measure and the values of parameters accepted for analysis as random variables with normal distribution. The paper presents solutions for assessing the safety of excavations based on probabilistic methods of level II and level III. For practical purposes, classification of the degree of risk of loss of excavation stability was proposed, in which the probability of loss of stability (level II method) and probability of dangerous state (level III method) were assumed as a criterion. The general characteristics of the excavation support behaviour were indicated for individual stages. The whole is supported by practical examples from over 20 exploitation fields in several mines of the Upper Silesian Coal Basin. The proposed method can be used both at the stage of design and use of the excavation.