A Comprehensive Study on Subsidence Control Using COSFLOW

Increasingly, mine subsidence is becoming a major issue of community concern. Among the measures of subsidence control, a more effective and economical technology, namely Overburden Grout Injection Technology (OGIT), is recently developed in China and Australia by injecting waste material into the bed separations during longwall mining to achieve subsidence control. The OGIT is proposed for the subsidence control in West Cliff Colliery located at the Southern Coalfield of the Sydney Basin, Australia. The three-dimensional finite element code COSFLOW is applied to investigate in a detail the bed separation developing with longwall mining and the effect of grout injecting into the separations in order to guide the subsidence control design when using the OGIT in West Cliff Colliery longwall mining practice.