Post mining subsidence abatements in Wyoming abandoned coal mines

Investigation of fill distribution in post-injected longwall overburden with implications for grout take estimation

“…This is particularly necessary in areas of large-scale mine voids (Holz and Batchelor, 2012); without stabilization, unexpected subsidence or sinkholes may occur at the ground surface, posing a risk to public safety (Helm et al, 2013;Ju and Xu, 2015;Turka and Gray, 2005). One such stabilization method is void filling using grout injection, which is applied to remediate sinkhole subsidence associated with voids in abandoned room-and-pillar mines (Greenwood and Hill, 2012;Holmquist et al, 2003;Karfakis and Topuz, 1991;Siriwardane et al, 2003), and surface settlement induced by other abandoned spaces such as drifts (Kipko and Kipko, 1990;Song et al, 2015). Grout injection into bedding separation (GIBS) is another effective method of ground stabilization; this method is used in existing or planned surface construction sites in conjunction with active longwall mining and utilizes the horizontal fractures at the rock layer interfaces associated with underground extraction .…”

Study on the Thin Plate Model with Elastic Foundation Boundary of Overlying Strata for Backfill Mining

“…Edges AB, BC, CD, and AD are the main roof's interface between the coal body and the backfill body. erefore, deflection, rotation angle, bending moment, and shear force are the same on the interface, and a continuous condition can be achieved by combining all the relevant equations as equations (5) and (6). A continuous boundary condition for the main roof can, therefore, be expressed as…”

“…Wu et al [2], through image algorithms and so on, analyzed the mining landscape changes before and after subsidence with the support of GIS technology. According to the characteristics of mining subsidence, Jung et al studied the comprehensive prediction and calculation methods related to mining subsidence, and so on [3][4][5][6][7][8][9]. In view of the subsidence characteristics of the surface steps caused by the mining of the shallow and extra thick coal seam, Ju and Xu [10] put forward three possible control methods for surface stepped subsidence.…”