Prediction of underground cavity roof collapse using the Hoek–Brown failure criterion |
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| Institution: | 1. Centre for Geotechnical and Materials Modelling, Faculty of Engineering and Built Environment, Building EA, The University of Newcastle, Callaghan, NSW 2308, Australia;2. Department of Civil Engineering, Aalborg University, Sohngaardsholmsvej 70, 9000 Aalborg, Denmark;1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China;2. School of Civil Engineering, Southwest Jiaotong University, Chengdu, China;1. Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore;2. School of Civil Engineering, Central South University, Hunan 410075, China |
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| Abstract: | Preventing roof collapse in underground cavities is a challenge to geotechnical engineering. In this study, three independent methods have been used to evaluate the roof collapse of underground rectangular cavities for a range of geometries and rock properties. The rock mass strength has been described by the Hoek–Brown failure criterion. The results of the analysis allow for prediction of roof collapse and to determine whether the failure surface that develops in the rock mass remains localised or extends through the full depth of cover. This is of significance if there are overlying cavities and when estimating surface subsidence. |
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