Socio-Economic, Subsidence, Transportation and Legal Ramifications of Potential Liquefaction Plant Sitings. Task 3. Prediction of Subsidence Potential over Abandoned Mine Land. Final Report

摘要

The purpose of this study is to investigate the causative factors for subsidence over abandoned coal mines. Three causative factors - roof caving, pillar failure, and pillars punching into soft mine floor, are discussed in detail. Aging and creep are considered two of the most important processes controlling the causative factors. Creep tests of coal measure rocks were conducted in the laboratory to better define the time-dependent behavior of coal pillars and the rocks surrounding them. Procedures for predicting subsidence potential over an abandoned coal mine were proposed using a combined statistical and material strength approach. 11 refs., 6 figs., 2 tabs. (ERA citation 11:035468)