Thong tin khoa hpc cong nghe mo Ltfa chon cac thdng so cd ban CHO CONG TAC KHOAN NO MIN KHI DAO GIENG DUTNG Calculating proper drilling and blasting parameters is one of the important factors in incre[.]
Thong tin khoa hpc cong nghe mo Ltfa chon cac thdng so cd ban CHO CONG TAC KHOAN NO MIN KHI DAO GIENG DUTNG Calculating proper drilling and blasting parameters is one of the important factors in increasing efficiency in drilling and blasting operations and driving speed In this paper, the authors provide some calculation methods of proper drilling and blasting parameters that have been applied in Vietnam ThS NGUYEN DUYEN PHONG ThS DANG VAN KIEN ThS PHAM tiLPC THQ Trwong Dai hoc Md - Dia chat ThS TRINH DANG HU'NG Vien Khoa hgc Cdng nghe Md - Vinaconmin Viee tinh toan eae thdng s l khoan n l hgp ly d l lap hp chilu khoan n l la y l u t l quan trpng viec nang cao hieu qua cong tae khoan n l va d l y nhanh t i e dp dap gilng md Bai bao t i n g hgp mpt s l phuang phap tinh toan cac thong s l khoan n l dang SLP dung tai Viet Nam, cac phuang phap kinh nghiem dang SLP dung tai mpt s l nude tren t h i gidi, g6p phin hoan thien viec tinh toan va lap hp chilu khoan n l thi cong gilng md phap khpan n l tao bien da dugc SLP dung nhilu han I Cong tac khoan no Hien nay, t i l n hanh thi cdng gilng dCpng, ngudi ta v i n SLP dung hai phuang phap n l la: n l vi sai thudng, n l vi sai tao bien Ngay nay, vdi viee SLP dung cae loai may khoan cd cdng suit ldn, thi nhCpng khd khan viec tang khii lugng khoan khdng cdn la dilu dang ngai Ngoai ra, ngudi ta cung da ehu y nhilu han d i n viee giam he s l thu'a tilt dien, nang eao dp I n dinh chp khii da xung quanh, giam bdt khd khan cho cdng tac xuc ble, van ehuyin Do dd phuang * Phu'O'ng phap no chia bac: Day la phuang phap p h i biln, phu hgp cho cac gilng Cac phu'O'ng phap pha da tren girang g i l n g Tuy thupc vao dilu kien dja chit, mCpc dp on djnh eua khii da, dien tieh dao cua guang gilng, ngudi ta SLP dung ba phuang phap pha da: - Phuang phap khoan n l chia bae: - Phuang phap khoan n l hinh xoln Ic; - Phuang phap khoan n l toan guang hinh vudng hay hinh chCp nhat Cac cdng tae chinh mpt chu ky nhu khoan, nap, n l thdng gid dugc tiln hanh tren mpt nu'a mat cat ngang CUE gilng, d i t da sau n l dugc b i n vang xuIng mat elt ngang cdn lai (thip han), nhd tao mpt dp chenh cao thuan tien cho thoat nude c i n thilt Cong tae khoan n l duge thyc hien tugng ty nhu n l chia bae nhd eho edng trinh ngam vdi mpt mat ty phu thCp hci (hinh 1) Cdng tac khoan d u g r thyc hien bang t l hgp may khoan tay chay bang nang lugng nen Hinh Phuo'ng phap khoan no chia bac dao gieng [1] KHCNM SO S I O I P CNKT HAM LO Thong tin khoa hpc cong nghe mo Hinh Phwong phap khoan no hinh xoan 6c Nhuge dilm cua phuang phap la chia guang theo bac, dd, thdi gian thye hien eae cong tac keo dai, lam giam t i e dp xay dyng gilng Do dd, nd thudng dugc ap dung cho cac gilng cd dien tich mat cat ngang Idn, hoac dit da y l u Viec n l toan mat elt ngang gap nhilu khd khan dp khdng cd cac thilt bj ed cdng suit ldn * PhiFcng phap khoan n l xoln 6c Phuang phap dugc SLP dung d i u tien tai Thuy D i l n , phu hgp dao gilng theo hudng tu' tren xuIng vdi dang mpt hinh xoln Ic Chilu cao cua bac phu thudc vao dudng kinh cua gilng va khii lugng d i t da dy kiln n l Trong mdi dgt n l , mpt mat elt hinh xpan I c dugc n l vdi mpt gde du Idn d l ed t h i hoan thien cac cdng viec mpt thdi gian ehu ky da dy kiln trudc (hinh 2.) [1] Cac l l mpt dgt n l dugc khoan song song va ed chilu dai nhu Hinh Phwong phap khoan no toan mat cat ngang vdi dot pha hinh ndn tai trung tam nen de thyc hien va ludn tao 6\j 1^, cac Idp da d bj nen ep r i t manh dan tdi lam giam r| va lam tang ca hat cua d i t da n l Bdi vay, 6k he s l SLP dung Id khdng doi ^, ^ kg/m OQ (6) s l l l tren 1m^ guang gilng dugc xac dinh: a.t^.k ;kg/m iV = ^ - ^ ^ ; ( l ) = D] + 20; (16) gdp phin lam gia tang t i e dp dao gilng, tang nang suit lao dpng va giam gia xay dyng gilng Khi chilu sau Id nhd (l Hinh Lya ehgn tien gin dung theo dien tieh gwong gieng [1] ' • ^ II K i t luan Nhin chung, cd nhilu phuang phap d l xac djnh cac thdng s l khoan n l dao gilng dCpng d md Cac thdng s l thudng phu thupc vap r i t nhilu y l u t l khae nhau, dd cae gia tri tren cd tinh chit djnh hudng ban dau Gia tri c i n dugc d i l u chlnh theo hien trudng d l phu hgp han vdi dilu kien thyc t l Tai lieu tham khao [1]- Carios Lopez Jimeno Drilling and Blasting of Rock Rotterdam -1995 [2]- Nguyin Cong Trjnh Hudng din thi cong gieng dung - T1,T2- Dai hpc mo - Dia chit -1971 [3] - Pakrovxki N.M - Oao va dao sau gilng mo (ban tiing Nga) - Nha xult ban Ldng d i t Moskva- 1967 [4] - Boki B.V.va nnk - Cong nghe va co hoa xay dyng cong trinh ngim va m6-(Ban tiing Nga) - Nha xult ban Long dit Moskva-1971 [5] - Kartojia B.A.va nnk Xay dyng md va cong trinh nglm-Tap (ban tiing Nga) Nha xult ban Vien Han lam Khoa hpc Mo - Moskva- 2001 [6]- Calvin J.Kenya,Ph.D Blasting Design - Rotterdam Ohio-USA-1995 ... sau: Khi su'' dung sa d l n i i t i l p va song song thi =(0,75^1,25)h, SLP dung sa d l phli hgp: n l u khoan bang bua khoan tay va b l e bang may b l e loai nhe: = (0,5^1,1)h; khoan bing khoan. .. la thdng gid, cong tac chuin kit khoan Id, nap va n l Khi chilu sau 16 Idn thi t i c dp khoan se giam xuIng dac biet la khoan bing may khoan tay va he s l SU'' dung 16 cung giam, ca hat dit da... cd t h i tiln hanh eae edng viec mpt each d i n g thdi Cac thdng s l khoan n l va bien phap t l chCpc thyc hien cac cdng tac khoan n l dan gian, khong ddi hdi ngudi thg phai cd qua nhilu kinh nghiem