Subsidence Prediction for High-Extraction Mining Using Complementary Influence Functions

摘要

Surface subsidence caused by high-extraction underground mining is described through complementary influence functions. The concept of complementary functions was introduced recently by Sutherland and Munson. This concept differs from other proposed concepts in that the surface displacement is the result of the combined contributions of mined and unmined zones. This approach eliminates computational difficulties experienced with the conventional influence functions to complex room-and-pillar configurations. The analysis framework is reported here in two forms. The first is for the complete complementary influence function formulation and the second is the degenerate case of the complementary influence functions applied to a longwall geometry. The former is solved analytically; the latter graphically. Both are illustrated with analyses of actual case histories. 13 figures, 3 tables. (ERA citation 08:019613)