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A Study on the Evaluation Method of Subsidence Hazard by a Diffusion Equation and its Application  

Ryu, Dong-Woo (한국지질자원연구원 지반안전연구부)
Synn, Joong-Ho (한국지질자원연구원 지반안전연구부)
Song, Won-Kyong (한국지질자원연구원 지반안전연구부)
Kim, Taek-Kon (SK건설㈜)
Park, Joon-Young (㈜ 지오제니컨설턴트)
Publication Information
Tunnel and Underground Space / v.17, no.5, 2007 , pp. 372-380 More about this Journal
Abstract
Surface damage due to subsidence is an inevitable consequence of underground mining, which may be immediate or delayed for many years. The surface damage due to abandoned underground mine is observed to be two subsidence types such as simple sinkhole or trough formation to a large scale sliding of the ground from with in the subsided area. An evaluation of the risk of a subsidence occurrence is vital in the areas affected by mining subsidence. For a subsidence prediction or a risk evaluation, there has been used various methods using empirical models, profile functions, influence functions and numerical models. In this study, a simple but efficient evaluation method of subsidence hazard is suggested, which is based on a diffusion theory and uses just information about geometry of caving and topography. The diffusion model has an analogous relationship with granular model which can explain a mechanism of subsidence. The diffusion model is applied for the evaluation of subsidence hazard in abandoned metal and coal mines. The model is found to be a simple but efficient tool because it needs information of geometry of caving and gangway and the topography.
Keywords
High in-situ stress; Slabbing; Spalling; Brittle failure;
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