Characterization of Overburden Response to Longwall Mining in the Western United States.
Proceeds--11th Int'l Conf Ground Contr in Mng Univ of Wollongong Australia PP 334-344 :334-344
The U.S. Bureau of Mines installed surface and subsurface instruments at a mine site in Colorado to monitor and characterize the overburden response to longwall mining. Instrumentation included a time-domain reflectometry cable, a multiple-point borehole extensometer, vertical-deformation surface monuments, and in-mine pressure cells for monitoring abutment, pillar, and gob loads with respect to the longwall face position. The purpose of the study was to collect data that could be analyzed to correlate the design of the mine layout to the resulting overburden failure response. Determining the extent of caving and fracturing is important in the arid and semiarid western United States because of the possible consequences to the fragile underground hydrologic systems upon which the land owners and users depend. This study differs from past investigations because the overburden contains massive sandstone members that impose special conditions on the caving process and pressure redistribution above the longwall panels.
Proceeds--11th Int'l Conf. Ground Contr. in Mng. Univ. of Wollongong, Australia, PP. 334-344