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Elk Creek Mine Subsidence Page 170 February 26, 2003 <br />I~ • APPENDIX C. NCB GRAPHS USED TO PREDICT SUBSIDENCE EFFECTS <br />Graph C1) Vertical subsidence correction graph for longwall panel <br />width with respect to depth (NCB, 1975) <br />• <br />m <br />E <br />.~ aou <br />H <br />D no <br />w 3O0 <br />Z <br />a 1O <br />Boa <br />60 <br />O <br />. <br /> I . <br />o - - -- ---~- - ..- N- <br />~: _....._ <br /> <br /> %` <br /> <br /> <br /> i~ <br /> :~ <br /> <br /> <br /> ti <br />~ <br />~ <br /> ~ o~ - <br />- -~-~ ""~ <br /> ~ <br />~ ~ <br />° ~ <br /> _ <br />ur <br />i _ <br /> Q <br />J °' <br />~. ' ~ <br />,r. <br /> H~- <br />, --.. ........ . .. __. <br />i <br />i ; " ~ <br /> <br />i ~ i o' <br />vY'~ ~ <br />~ <br />i~~ <br />~ <br />~ <br />i _- <br /> <br />~, <br />i ~ ! <br /> <br /> <br /> .. <br />o - <br />~ <br /> . ....._. ..-_ -.x» _~~~ ~ ..J <br /> <br /> <br /> <br />i <br /> <br /> <br />i .,.. <br />~ <br />ao <br />>w <br />Aso <br />seo <br />eoo <br />4so <br />.wo <br />aw <br />O 50 100 X50 ]0D 75D 700 750 400 450 500 550 boo 650 700 750 800 sso 900 <br />PANEL DEPTH (meters) <br />RELATIONSHIP OF SUBSIDENCE TO PANEL WIDTH AND DEPTH (NCB, 1975) ,~ <br />-170- <br />