THONG TIN KINH TE KHOA HOC KY THUAT NGANH MO tMt MOT SO PHUONG PHAP PHAN LOAI DAT DA THEO DO NO ThS NGUYEN DINH AN Trudng Dai hge Mo Dja chat ^^ ir dung nang lupng chit nd d i pha vd di t da ^ v va kh[.]
tMt THONG TIN KINH TE-KHOA HOC-KY THUAT NGANH MO MOT SO PHUONG PHAP PHAN LOAI DAT DA THEO DO NO ThS NGUYEN DINH AN Trudng Dai hge Mo-Dja chat ^^ ir dung nang lupng chit nd d i pha vd dit da ^ v va khoang san cung la phuang tien chu y i u > ^ va cd hieu qua nhit hien Muc dp dap vd phu thudc chu y i u vao tinh ehlt ca ly cua dit da, loai chit nd va phuang phap diiu khiin nd Trong cdng tac khoan nd min, phan loai d i t da rit cd y nghTa ddi vdi cdng tac khoan, nhung lai khdng d\jegc su dung nhiiu d i danh gia dp nd cua dit da Op nd dupe dae trung bing muc dp khd nd cua d i t da va duac xac dinh tu k i t qua nd min, loai thudc nd su dung va cac diiu kien khac phu thudc vao ddi tupng no Tdm lai dp nd cho chung ta biit d i t da d i nd hay khd nd mdt diiu kien cu t h i Cd nhiiu phuang phap khac d i phan loai dit da theo dp nd Mdt sd nha nghien cuu su' dung moi lien he giira cac k i t qua tu phdng thi nghiem va thye nghiem ngoai hien trudng, mdt s i khac thdng qua mdi quan he giira tinh chit ea ly cua d i t da vdi cac thdng sd nd hoac thdng qua muc dp khd khoan cua d i t da Mpt so Phu'O'ng phap phan loai nd 1.1 Phan loai no eua Lyiy (1986) Lyiy da dua mdi lien he giira dp nd (Bl) eua dit da vdi tinh ehlt cua khdi da nhu sau: BI = y2(RMD +JPS +JPO + SGI + H) (1) Trong dd: Bl - Dp nd; RMD - Dac diim cua khdi da; JPS - Khoang each giO'a cac khe nut; JPO Hudng khe nut; SGI - Anh hudng trpng lupng rieng cua dit da; H - Dd cung cua d i t da Cac thdng sd tren dupc xac djnh Bang 1, va dp cung H (theo thang dp cung cua Moh) dupe gidi thieu Bang Dk tiin hanh phan loai tae gia da thing ke sd lieu tu nhiiu vu nd thye nghiem khac (Loai thudc nd su' dung d i nd thye nghiem la ANFO) Dp nd Bl=100 da cd khdi Idn va rit cCrng, cd trpng lupng rieng vao khoang T/m^, dit da mim bd rdi thi Bl vao khoang 20 Mdi quan he giira dp no va chf tieu thudc nd dupc biiu diin tren H.1 2.2 Phan loai no cua Ghose (1988) Qua kit qua nghien cuu phdng thi nghiem kit hpp vdi thye nghiem Ghose da d i xult each phan loai dit da cho cac md (Bang 3) Bang Cac thdng sd dac trung de xac dinh dd nd (Lyiy 1986) TT 1.1 1.2 1.3 2.1 2.2 2.3 3.1 32 3.3 3.4 Thdng sd Dac diem khdi da (RMD) Bdt, gidn bd Khdi Khdi Idn Khoang each giira cae khe nCrt (JPS) Nhd(1 m) Hudng elm cua khe nut (JPO) Nam ngang Hudng ddc ngoai be mat Hudng ddc vudng gdc vdi be mat Hudng ddc vao Anh hudng cua trpng lupng rieng cua dit da (SGI) (SG - Trpng lupng rieng cua dit da T/m^) Gia tri 10 20 50 10 20 50 10 20 30 40 SGI= (25SG -50) Bang Phan loai cirng cua dit da theo Moh TT 10 Vat lieu Oa tan Mudi, thach cao Canxit Fluorit Apatit Fenspat Thach anh Topaz Corindon Kim cuang Op cung theo Moh 10 Chi °M ti^U 0.4- ^ thudc no 0.3 AMFO ^ y ^ ^ (kg/t), 0-2 • 0.1 • • ^ Dp nd ^/"^ ^^ 20 40 60 80 100 H Dd thj xac dinh chi tieu thudc nd CONG NGHIEP MO SO - 2009 CNM THONG TIN KINH TE-KHOA HQC-KY Ghose da dua dupc mdi lien he giira chf tieu thudc nd va dp nd cua d i t da cho cac md nhu sau: BI=(DR+DSR+PLR+JP0+AF1 +AF2) (2) Trong dd: Bl - Dp nd cua d i t da; DR - Mat dp eua dit da, T/m^; DSR - Khoang each giua cac v i t nut, m; PLR - He sd tai trpng (MPa), xac djnh dp Bang Cac thdng sd dac trung di xac djnh nd Khoang each giira cac vit nut (m) He sdtai trpng (MPa) Hudng khe nCrt He sd diiu chinh He s i diiu chinh MO ben cua d i t da; JPO - Hudng khe nut; AF J - He sd diiu chfnh phu thudc vao diiu kien nd min; AF - He sd diiu chinh phu thupc vao chiiu sau Id khoan va dudng can Cac thdng sd tren dupe xac djnh d Bang va chi tieu thudc nd dupe xac dinh theo Bang Gia tri 2,0-2,3 12 0,4-0,6 20 2-4 15 Hudng vudng gdc vdi mat phlng 12 Thdng sd Mat dp (T/m^) THUAT N G A N H 1,6-2,0