Mechanical Parameters of Deep-Buried Coal Goaf Rock Mass Based on Optimized GSI Quantitative Analysis

Autor: Qingqiu Wang, Mo Xu, Yunhui Zhang, Xinyu Cen, Xingwang Chang
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Advances in Civil Engineering, Vol 2021 (2021)
Druh dokumentu: article
ISSN: 1687-8086
1687-8094
DOI: 10.1155/2021/9935860
Popis: In order to obtain the accurate mechanical parameters of deep-buried coal goaf rock mass, the limitation of geological strength index (GSI) in concealed rock mass is analyzed. Based on the test result and analysis of the current normative standards, the classification indexes of rock mass structural are optimized based on discontinuity distance d and rock mass integrity index Kv. The ratio of rock mass saturated strength to dry strength, η, is introduced, quantization formula of structural surface conditions is proposed, and the influence of groundwater and rock types is included in structural surface condition classification. The GSI system is improved to better suit all types of deep-buried and water-rich rock masses. Furthermore, the rock mass disturbance factor D’s quantitative formula is listed according to the Hoek–Brown (HB) criterion. Taking the goaf roof under railway as an example, the parameters of deep-buried rock mass are obtained based on the improved quantitative GSI system and HB criterion. This research provides a scientific reference for achieving geological parameters and engineering designing in goaf areas.
Databáze: Directory of Open Access Journals
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