GENERAL30442 - Laserfiche WebLink

Home Browse Search

JIM TATUM & ASSOCIRTES TEL ~3-995-7191 Rpr 135 3:10 No .002 P.04 -" TO 17139937191 ~.0~ progi ees Re on Tatum House $ubsideaoe issues• . Page 3 Apri112,1896 The ooncluaioas of the report ox the study with reepeat to the sarljace were: • There was not eaough~data to dateraaine the aa~le ot`draw or the magnitude of mazimum subsidence. (pane G-88) • Vertical dlaplacemeat of the overburden began when the mining Enos was 600 ft from the monitoring point. (page 7-8) The coal seam iA 600 ft deep at this point, sad the bottom of the effected ezteneometer rod was 184 ft above the mine. • Movements both horizontal and vertical were noted all along the survey lines of eurliaee monuments. (page 7.8) • The orerbardea appears to subside is a relatlvelj+ coherent roclunass. (page 7-8) • There ie, a strong suggestion that the gmnndwater in the overburden is is direct communication with the surface waters of the Pnrgatoire River. (page 7-4) Measurements were made on the surface, survey lime 1 sad 8 measured the effects of roomand pillar mining, survey line 2 measured the effects of longwall mining. . The survey lines were 84 surikoe monua»nts arranged in lines to measure the chaagee•ia elevation sad horizontal coordinates es mining progressed underEraund. A review of the data analysis, demonstrates that the vertical displacements on the surface tended to show a raising of the lead suritwe on the order of a 0.1 it., more than b00 tt. is flront of the mining face, regardless of the type of mining, and then there was a settling ae the mining face was developed peat the point. Over the longwall the settlement was more than 8 ft., on the other lines over the room and pr~lar mining, from 0.6 R to l.b ft. The same effect of raising the land surface was noted on each survey line. The surveys were not completed for the full subsidence. Two ppoomte were chosen that appear were oaiy effected by the mining under study, the efibets of other mininP in the area is also noted in the report. An estimate of the ds to mining and the amount of surface duplaoement on a specific date, 'cafes that surtitce movement oaourrsd at eagles of 86° 80' end 87° 10' measured from a vertical line at the ~ to the location of the surti0.oe monument. There was substantial horizontal diapleaemeat measured also, but the time relationship was not well defilaed is the report. The measured raieiaP of the land surface has been noted in other studies for other mines. and has been referred to as a "wave ePlbat" by eomo investiPators. Sometimes this phenomenon ~x be attributed to a s$diag of the sur<hce soils down hillsides or "plliag up" as the result of surtgoe deformations. The important observation ie that these was no drff'erenoe in the initial effects oa thn surfaae between longwnll or room .and pillar mixing.