Thong tin khoa hpc cong ngh$ m6 Sir DUNG BUA SCHMIDT XAC DjNH NHANH do ben cua dd tram tich tqi hien trudng So far, the quick determination of the rock mechanical strength at the drifts has been paid[.]
Thong tin khoa hpc cong ngh$ m Sir DUNG BUA SCHMIDT XAC DjNH NHANH ben cua dd tram tich tqi hien trudng So far, the quick determination of the rock mechanical TS PHAM MINH OU'C strength at the drifts has been paid much attention to TS u i VAN CdNG Under the different geological conditions, the same rock KS TAO VAN NGAN provides its different toughness with the utilization of different equipment The paper refers to the utilization of the Vi^n khoa hgc Cdng ngh^ t/ld-Vinacomin Schmidt hammer for the quick determination of the sedimentary rock toughness in situ Tinh chat co* hpc cua d^ ^nh huo-ng d^n qua trinh cong nghp va ch6ng giu thi cong cac duo'ng 16 I6ng d^t Su hinh cac tr^m tich la nguyen nhan tao nen cac tinh chat ca hpc cua da khac nhau, tac dpng vao chung theo cac huo'ng khac Qua trinh tram tich la qua trinh tao 16'p theo kich thuo'c cac CO' hat nhu: hat mjn, hat trung hat tho tuo'ng ung vo'i cac loai nhu: than, set, bpt, cat, san, cupi k§t Su tao cac 16'P khong nhu-ng chi theo khoi 16'n, ma cung mpt loai da cung c6 su khac nhau, khong nhung ve cau tao hgt ma c6n khac bi?t ve tinh ch^t CO' hpc ma dac trung nhat la dp ben nen doc true Khi nen mpt mSu da theo hudng vuong g6c vo'i 16'P va dpc theo i6'p da cho th^y su khac biet ro rang giija dp ben nen vuong g6c Iu6n 16'n hen so vo'i dpc theo 16'p Ngoai ra, v6'i cung mot logi da, nhung tai m6i vj tri khac (dp sau, hay 6" g4n cac phay, uon n^p, kho hay ngap nu6'c v.v ) d4u th^ hien dp ben khac Qua trinh dao 16 la qua trinh tac dpng co* hpc (khoan, no hay cIt) d l pha vo" da Qua trinh pha da c6 t h i gop phan giu cho da xung quanh duo'ng 16 khdng bj giSm dang k l muc dO 6n dinh hay tac dOng mgnh lam cho kh6i 6k bj nut ne c6ng ngh^ lam mJit 6n djnh Trong qu^ trinh thilt k l , thi cong duo'ng 16 mo, mpt s6 dgc tinh ve dp bin v l c^u true da dup'c quan tam d6 la dp b i n nen dpc trgc, m6dun dan h i i hay SM' nut ne, phan 16'p, goc doc cua 16'P da v.v Den nay, hau het cac tinh chSt CO- ly cua da deu dM'a vao kit qua nen thu cac mlu lay tu cac 16 khoan qua trinh khoan tham d6 Song cac k i t qua xac d|nh qu^ trinh khao sat, thSm d6 c6 tinh dgi dj$n khdng cao, khoang each giij'a c^c Id khoan rit 16'n MIt khac, cac I5i khoan tu tren m l t dat xuIng nen cac loi khong vuong g6c v6'i 16'p da, do, nen, lye nen khong the vuong goc hay song song v6i 16'P da Trong thi cong, d l c6 nhung quyit djnh nhanh, chinh xac ve dp b i n ca hpc cua da c i n c6 s6 li?u nhanh Trong do, de xac djnh dp ben trpng thi nghiem can rit nhieu nguyen cpng tugia cong mlu,eat got mai phing mgt m l u , nen mlu d6i hoi phai co thd"! gian dai Do d6, bi$n phap xac i^nh KHCNM SO 6/2012* CNKT H A M L nhanh tgi hi$n trud'ng (in situ) IS bi$n phdp huu hi$u nhit Hi$n dang t i n tgi mot s6 bi$n ph^p xiie djnh nhanh va chinh x^c cdc ehi tidu ca hpc da tgi hi^n truang, la si> dgng bua d^p nly Schmidt (phuang phap khong phA huy) va xac djnh tren may nen mlu khong d|nh hinh {BU-39) (pha huy mlu) Gim thi^u bua dap Schmidt Bua dap Schmidt la loai thilt bj thi nghipm hign truorig, dup'c SCP dgng chu yeu d l xac djnh dp b i n nen cua betong, c i u tao cua bua dup'e thi hien tren hinh Phy thuOc vao logi va dg b i n cua betdng nhu betong liln khoi, betSng due san betong phun hay betong sieu ngng, betong ngng, betong nh? hay betong x6p v.v Mpt so hang san xuat thilt bj nhu PROCEQ, DRC hay TECNOTESTv.v da san xuat mpt so loai bua va du^c phan loai nhu sau: Loai N Tren thj truang dang biin hai logi thiet bj, logi hien s6 tren thang khong ty ghi (N) v a t y ghi (NR) Log! N, vo'i nang lup'ng dap 2,207Nm, Thong tin khoa hoc cony nghe m o 1- D^u dap 2- Qua dap 3- Ld xo nen 4-Ch6t khoi Id xo 5- Ld so ndn iao krc dip 6- Thanh d§n hu'&ng, 7- DJa ham 8- Bang chi thi tn so tan sual dap hoac bang chi thi dien tu 9- Tam che bang hien s6 doi v&i may khong tu ghi 10- Kho^ ham qua dap 11-V6bua 12 - Cliot ham 16 xo dap Hinh 1- Cau tao bua Schmidt du'p'c SU' dung kha bien viec xac dinh ben nen dpc true cua betdng lien khoi t u 10 - N / m m ' (10 - M P a ) Loai NR t u ghi (R - record) (D1GI Schmidt), cac so lieu du'O'c truyen den bp n h o tren bua va truyen den may in, su' dung cho cac loai betong co ben t u 10 - TON/mm-^, nang lu'ong dap cua bua - N m Hinh anh bua S c h m i d t loai N t u ghi, tren hinh 2, d a c tinh ky thuat cua biia S c h m i d t loai N giai thieu tai bang Loai L Bua Schmidt loai L la loai thiet bj nhe, d i i n g t r o n g viec xac dmh dp b i n cua cac t a m betong co chieu day tu' 50 den 100mm, cung co hai loai, Bang Dac tinh ky thuat cua bus Schmidt loai N Hang san xuat TECNOTEST PROCEQ DRC Nang luong dap 2,207Nm 2,207Nm 2,207Nm Pham VI 10 - 70N/mm- 10-70N/mm' 10-120N/mm' Lu'u so lieu khong tu gh khong tu gh tu ghi Kich thu'O'C 55x55x250mm 55x55x250inm 90x55x250mm Trong luong 1,2kg 1,6kg 3,2kg khong tU' ghi (LB) va ghi lu'u so lieu (LR) Hinh anh bua Schmidt loai L tren hinh 3, dac tinh ky thuat cua bua loai L duo'c gio'i thieu bang 2, Loai LB vol nang lu'ang dap 0,735Nm, s u dung de xac d m h ben betong tu' 10 N / m m ' , chu y&u de xac dinh b i n cua betong nhe, betong xop va vQ'a dac tinh tu'cng t u nhu' loai Loai LR la loai t u ghi so lieu va truyen so lieu d i n may m, co b i n betong t u Hinh Biia Schmidt loai L khong tu' ghi de xac dinh 10 - 70N/mm^ Bang Dac tinh ky thuat cua bua Schmidt loai L Hang san xuat Loai Nang lu'Ong dap Pham VI Hinh Bua Schmidt loai N PROCEQ PROCEQ SILVERSCHIUIIDT-L SILVERSCHMlDT-L 0,735Nm 0.735NrT 10-70N;mm' 10-70N/mhl^ Luu so lieu khong tu gh tti ghi Kich thu'oc 55x55x250(h)mm 55x55x260(h)mm Trong iuo'ng 600g 600g KHCNM S 6;2012» CNKT H^M L ^•.•;^r^^ie,*^iiisgs^ Thong tin khoa hoc cong nghe mo Nang lu'cng dap cua bua 0,735Nm Loai M Bua Schmidt loai M la loai thiet b! nang, voi nang luong dap Ion, din 29.5Nm, duo'c su dung de xac dmh ben ciia betong mat duang, san bay cau duang nen mong va cac kit cSu khac Loai it xu^t hien tai Viet Nam Loai P Bua Schmidt loai P vai nang luang dap nho 0,88 Nm su' dung de xac dinh ben cua betong va vat lieu co ben thap va cu'ng thap, nhu betong bot, betong bat khi, pham V! -30 N/mnv Trong loai PT v6'i pham vi xac djnh dp ben khoang 0,2 - N/mm^ va loai PM su dung de xac djnh bin cua vua xay va trattuang (hinh 4) Si> dung bua Scfimidt de xac djnh ben cua da tram tich Nhu trinh bay tren, bua dap Schmidt su dyng de xac djnh dp ben nen eua betong dua tren dong nang eua qua dap duac gia !ue bo'i 16 xo tai duoi bua, qua dgp va ehgm vao mat mlu lap tue bj bat tro' lai, vgt CO dp ben hay dp eung cang cao thi dp nly va tan suit cOa qua dap dao dpng cang 16'n Bang ehi thi gan tren v6 bua t h i hien chi so dap va dp bat cua qua d$p De xae dinh dup'c dp ben cua vat lieu phai tien hanh it nhat 12 l l n thu cho mpt dilm [7] de tim mli lien h$ giOa s6 l l n dap tuang xung vai dp ben cua vat lieu De bua Schmidt hoat dpng tot, dam bao tin cay, bua can duac bao quan va kiem tra Hinh Bun Schmidt lo.ii P Hinh Kiem tra ho^t d^ng cua bua Schmidt hoat dong sau 1000 l l n si> dung De kiem tra hogt dpng cua bua, hop dyng bua luon CO kem theo mpt chile de va mpt cue mai (hinh 5) De dup'c dung de bua dap vao thu va cue mai de lam nhan be mat vat ein xae djnh dp bin BOa dap nly Schmidt lam vipc theo phuang phap nen dilm, cho nen d l be m|t v|it thu tilp xuc d i u vai d i u d i p , truo'c dua bua 6^ thu eIn lam nhan va ISm phang b l m|t Ccic chi s6 d i p dup'c ghi ch6p d l xac djnh m l i tuang quan gii^a dp b i n va chT s6 dap, hoac xac dmh m l i lien he giija chi s6 d$p vo-i t i e dp truyin song am Cap mlu sau xae djnh bang bua Schmidt dem nen pha huy d l xae dinh dp bin thyc t l Trong tru6'ng hp'p xae djnh dp ben cua betong liln khii, thi cong tai ch5, hay eua da mo, khong phai luc nao bua eung tac dpng thep huang thang KHCNM SO 6/2012* CNKT HAM L dCrng tu tren xuong ma co the nIm ngang, hay nghieng so vm be m|t m i u Do hogt dpng cua bua Schmidt la sy va dip bit cua qua d|p nen tan suit d i p eua qua d i p khae theo huo'ng tae dpng Vi v|y, d l k i t qua xac djnh dp bin bing bua Schmidt mot each trung thye, eIn chuyin dii kit qua dp b i n theo phuang tac dpng eua bua (hinh 6) Cae bang tra kit qua chi so d|p va tra dp bin trSn than bua Schmidt vai eae lo^i nhu N L, P, V.V ma eac nha san xuit da giai thi|u d i u dup'c thyc hi0n eho vat lieu chu yeu la bdtong, Nhy v|y, d l su dgng bua Schmidt nganh mo eIn phai tien hanh cac thi nghi|m ph6ng, vai so luang m l u dgi di|n cho tili-ng vung dja ehat (Quang Ninh, Thai Nguyen, Ngh#An, Quang Nam, D i n g bang spng Hing v,v ) de CO the chuyen dii s6 tr in bua so lieu v l dp Thong tin khoa hoc cong nghe m o t m i u Bang ket qua kilm tra trang cSc cji4u ki?n thm gian va i m khac Bock S [3] Sa dua m6i quan h0 giCfa si ben v&i tu6i betong va dq km theo cong thi>c (4): /,=/,.;!'; C.l,9368.e"'"" Hinh Bang tra chuyen doi ket qua b^n cOa vSt tht> theo phuvng tic dgng ciJa bua bin cua cac loai da Thi du, d^ sii dyng bua Schmidt N xac dinh dO b i n betong lien kh6i Bock &nnk (2005) [3] da lam 57 liln thi nghiem tren m l u betong kich thu'oc 150x150x150 va 30 mlu gach kich thu'dc 65x65x65 Tru-oc kht nen pha huy, ngu'O'i ta si> dung bua Schmidt N va may sieu am Sau mai nen pha huy tren may nen MTS-810 NEW Tif kit qua thutac gia da lap moi quan he giu'a ben nen vo'i ket qua thii nghiem tren bija theo cong thCrc(1)va(2)sau Do bin theo m i u nen; ftc»t» = 3,95.e°»'«L (1) Do bin theo sieu am; fccuK = 0,355.e°°°'°»i(2) Hay ting hp'p ca hai tru'O'ng hop cho kit qua; fc»K = 6,79.e»=2i-i°-= +3,22eW"' (3) Trong do; fo - Dp ben nen cua m l u betong, MPa; L - S6 lan dap tren biJa Schmidt, lan; u - T i c t^uyln song am, km/giSy Dp b i n cua betong hay da mo phu thuoc vao t u l l cua beting cung nhu" am cua (4) Trong fc - D | bin n6n cua bgtong, MPa; Q ' - Chi so s i I4n dSp t h i hien tai bang tren than bua, lan w /,,.„ "(5) Trong C - H0 so tu-CTng quan; fcusi - Dp bin cua mlu thii; fc - D | ben lly theo ham tu'cng quan Trong qua trinh xac dinh dp '°^" '^^^ " ' 'i^U' 1000 0,92 0,86 0,78 0,75 0,70 0,60 Bing Gia trj r> va dd am cua betong am betong )^ BSo ho^ nwCfc Nua kho Khd hoan toan 1,12 1,00 0,96 Bing Ket qua xac djnh 6d ben cOa mot soda tram tich [1] Tic gia Him tucng quan r Cic gii tri xic Loai di