Abstract
Numerical simulation approaches have been widely applied to study mining induced subsidence, and they are potential methods to study the flooding induced uplift for abandoned mines. This paper gives an overview about different numerical approaches to simulate uplift induced by flooding abandoned underground mines, including three different hydraulic conditions, considering both unconfined and confined water conditions. Four basic simulation schemes using 1-dimensional rock column models verified by analytical solutions demonstrate these procedures. The results reveal that flooding induced uplift is mainly related to the pore pressure in the mine goaf. The parameter study documents that height and stiffness of the mine goaf have the strongest influence on maximum surface uplift.
Highlights
Mining induced subsidence has already been studied for decades
Four basic simulation schemes using 1-dimensional rock column models verified by analytical solutions demonstrate these procedures
This paper provides an overview about different numerical simulation approaches including full coupling, partial coupling, effective density and effective stress method to simulate flooding induced uplift for abandoned coal mines
Summary
Mining induced subsidence has already been studied for decades. Several approaches are proposed, such as empirical methods (including graphical method and profile function method) (Asadi et al 2004; Hood et al 1983), influence function methods (Cui et al 2013; Hejmanowski 2015; Hu and Lian 2015; Luo 2015) and physical models (Ghabraie et al 2015; Wang et al 2021; Ye et al 2018; Zhang et al 2020). Pottgens 1995; Fenk 2009), but they have site-specific character and their use is restricted to areas having identical geological, mining and hydrological conditions. They can describe only simple geometrical conditions. Numerical simulation is a feasible method to study the uplift process and to provide predictions. Numerical simulations to study flooding induced uplift for abandoned mines involve the selection of appropriate simulation tools and schemes. This paper provides an overview about different numerical simulation approaches including full coupling, partial coupling, effective density and effective stress method to simulate flooding induced uplift for abandoned coal mines. Several hydraulic conditions like initializing rising water level inside the model, water inflow from outer vertical boundaries and water injection from the bottom boundary are considered
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