KHOA HOC VA CONG NGHE MO ^ ^ vDANH GIA HAM UfGNG QUANG D N < TRONG KHOANG Sl^lG DONG SIN QUV€N BANG PHUUNG P M P ORDINARY KRIGING ThS.TRAN DINH BAG - Trwdng Dai hgc Md-Dja chat KS VU DINH TRQNG - Tmdng £}ai hgc Cdng nghiep Quang Ninh i TS N G U Y I N PHU vy-Hp/K/Toahoc&CongnghemdWefWam ' Ting quan Cdng tdc ddnh gid hdm lyyng quang bdng ede phuong phdp tmyln thong thudng cho thiy sai so ldn vd dd tin c^y khdng cao ehua phan dnh ehinh xdc mdc dd biln dli ttong khdng gian cua ham luyng Ly thuylt dja thing ke giao su Matheron phat triln cung vdi nhdm phuong phdp ngi suy ttong dd eo Ordinary Kriging (OK) da Ididc phye duyc nhung nhuyc dilm ndy nhdm ndng cao dO chinh xde cdng tdc ddnh gid hdm luyng ttidn qugng Cdng ttidc nOi suy hdm luyng bdng OK nhu sau [3]: n(u) r -I Z*(u)= ZAO' tdi % (gid tti ldn nhdt tgi 97.5 % so dilm Id 2.7757) va ding thdi cd mgt vdi gia tti vuot hinh dpng the rin Uian qupng (^ng Sin Quyinqua gid trj nay, daac coi Id cdc dilm ngogi lai (outlier) Trong dd, viecttnhtoan cae variogram vd md hinh Song song vdi vige tgo md hinh dja hinh vd md \ri khii than qugnp lal nhay cam vdi cde diem ngogi lai ih thdn qugng dgng ttil ran, xdy dyng mdt md hinh ndy vd vdy, d n thilt loai bd cac dilm ndy Gid tti b\ ldn (block model) bao gim cde vi kiili nhd ed khoangttncay (95 %) duyc su dung dl loai bd cde h thudc xdc ^nh, eung phai duyc xdy dyng Md dilm ndy (Gid tri 95 % khoang tin cdy bang gid ttj ih khdi ldn d n phai dam bao bao phO hit dja hlnh ttung vj +1,96* gid fri Igchttduchudn bang 1,8) J vyc khao sdt vd thdn qudng nen kich thudc a md hinh khoi Idn duoc chgn theo cac true toa se la: X=2501705^2503715; Y=376133-378811; -426^253 (2010x2678x679 m) Kich thudc cua vi 6i nhd cung duoc chon la 15x15x50 m Nhu vay, CO 10661 vi khoi md hinh khdi (H 5) LZ H Biiu histogram va hdm phan bi tich IQy CDF cua than quang Bang Cdc ihdng s6 thing l^ cabin cua than qu^ia M6 hinh khoi Idn chira than quang dong Sin QuySn Tiep theo, md hinh the rdn than quang se duoc h hyp vao md hinh khdi ldn Bdng each tat cac vi khii khdng ndm than quang se yc logi bd, gidp eho vigc ddnh gid hdm lyyng ng cdc phuong phdp ngi suy tro nfin de dang vd inh xac hon (H.6) H.6 M6 htnh khoi than quang dong Sin Quyen Cuoi cung, d& lieu ham luyng quang duoc kit p (composite) phuc vg cho vigc phan tich dia )ng ke va danh gia ham luyng Do Id khoan cd : gdc nghieng khac nen phuong phap kit p theo mi0ng 15 khoan se dyyc lya chpn Thdng sl Sd diem (number of samples) Gia tn nhd nhdt (minimum value) Gid tri Idn nhat (maximum value) Trung binh sd hoc (mean) Gid tri tai 50 % sd dilm (median) Phuong sai (variance) Do lech tieu chudn (standard deviatton) Hg so phdn tan (coefficient of variation) Gia trj Idn nhdt tgi 80 % sl dilm (80.0 percenttle) Gidfrjidn nhat tai 90 % s6 dilm (90.0 percenttle) Gia trj idn nhdt tgi 95 % s l dilm (95 percenttle) Gid trj ldn nhit tgi-97,5 % sd dilm (97,5 percenttle) Dg Igch chudn (skewness) Gum 12926 0.000 14.5 0.45146 0.138000 0.526037 0.725284 1.606524 0.718000 1.400750 2.013000 2.535500 3.233498 Ban dd variogram Id cdng cg duyc sd dyng dl md phdng t'nh dj hudng cua dd ll$u Bing cdng eg ndy c6 thl xdc djnh duyc hudng ndottongkhdng gian Id lidn tyc nhat hay gid trj cua dd li$u thay dli nhu ttil ndo CONGHGHI(PMi.Sd4-2015 E^ KHOA HOC VA CONG NGHE MO l^iiong gian Trong piian m6m Surpac, ban vanogram dupc si> dung d l mo phong tinh di hu'ong tren mpt mat phang Ban dd varipgram se dt/pc ve tren mat phlng t^lat phlng du^oc chgn tarde la mat phang cd chua ban dd varicgram chinh va la mat phlng cd chi>a mdt tojc thl hien tinh lien tuc nhit cua du lieu khdng gian va tnjc gpi la tare chinh (H.8) fvlat phlng thr> hai vudng gdc vdi mat phlng chinh du'pc gpi ia mat phlng tliii elp cd ehCra bai variogram ttiLr d p va tuong tir, ban dd co c met tore mo phdng tinh lien tuc thii hai, gpi la ban {H.9) Mat phlng thii ba vupng gdc vol hai mat pti chinh va thii cip, dupe gpi la mat phlng nhd nlr^ chtia ban variogram nhd nhit va tupng tu, bar ehua mpt tore md phdng tinh lien tue nho r ichdng gian, gpi la tare nhd (H.10) H.8 Variogram thm nghiem va If thuyit (duvng do) va vi tri cua true chinh tren ban dd variogram (nim Iren mat phing XY, goc phwong vi 45°) H.9 Variogram thwc nghiem va ly thuyit (dwong do) va vi tri cua tnrc thir cap tren ban variogram (vuong goc v&i mat phing XY, goc phwong vi 45°) " '"• "'"(nlmio'Z^?^''"' ""' """"' ^"'tnic™lm"^'" "^' tmc ""»Ion) ™-