Thong tin khoa hpc cong nghe mo NGHIEN CUfU TRANG THAI UfNG SUAT BIEN DANG TRDNG KHOI DA XUNG QUANH CONG TRINH NGAM TIET DIEN LdN khi thay doi ty so img suat nguyen sinh NCS TRAN TUAN MINH GS TS PANKR[.]
Thong tin khoa hpc cong nghe m o NGHIEN CUfU TRANG THAI UfNG SUAT BIEN DANG TRDNG KHOI DA XUNG QUANH CONG TRINH NGAM TIET DIEN LdN thay doi ty so img suat nguyen sinh NCS TRAN TUAN MINH So far, underground constructions with large cross GS.TS PANKRATENKO.A.N section have been built in many countries on the world Dai hgc Md qudc gia Matxcorva for different purposes such as hydroelectric powers, transports, underground mines However, research PGS.TS NGUYEN XUAN MAN results and knowledge on stress and deformation in rock Vi^n Co hgc vi U'ng dyng Vi$t Nam masses surrounding tunnels having large cross section when changing the initial stress factor have been limited This paper provides some initial research results in this field basing on numerical method and predicts rock pressure for designation tunnels Dat van de gia thilt ban dau thudng coi Id ngudi ta dugc gid trj cua ty Cdc thdnh p h i n Cpng s u i t bdi todn phang vd bd qua thdnh s l la Idn han 1, thdm cni nguydn sinh ban d i u c6 quan PhIn u-ng s u i t dpc tryc az = nhilu^trudng hgp c6n Idn han hd tdi su b i l n d i i c a hoe va thudng chf quan tdm d i n ty 2, dieu ndy d u g c giai ^thich Idng k h i i d i t da xung quanh s l Cpng s u i t nguydn sinh nam rang, dd, khoi da bj chot giu' dudng h i m Cdc thdnh p h i n ngang vd t h i n g dCpng a3/a1 = theo phuang ngang Cpng suit ban d i u lien quan d i n 1- Vdi cdc bdi todn thdng dp lye theo phuang thang hinh dang vd kich t h u d c vung thudng thi ty s l a3/a1 < 1, dCpngJai giam, hogc d cac vi tri b i l n dgng deo, vung phd huy nhidn, thyc t l d nhieu b d d i e hoac g i n b l mat dat cung nhu dp lye d i t da tdc nai, bang cdc dyng cy dge, P h i n m l m Phase eho chung dyng Idn k i t e i u c h i n g giu' ^ ^,^ ^ ^.^ ^ ^ ^ ^ ^ ^ ^ ^ ^ duang ham sau duang ham Dan vj Gii tri Ky hieu TT Ten tham sd dugc khai ddo Cdc phuang MN/m3 phdp giai tich tinh todn cdn it 0,026 Dung dat da y quan tdm d i n v i n de nay, MPa 0,01 ak Dp bin nen khoi da khdng nhCpng vgy, thay d i i MPa 0.05 Luc dinh kit khoi da cdc thdnh p h i n Cpng s u i t 25 G6c ma sdt khoi da nguydn sinh ban d i u thi Cpng MPa 1200 E M6 dun dan hoi suit thCp sinh sau khai ddo cung 0,25 thay d i i Hien chua cd mpt Hd s l Poisson H nghidn CCPU t i n g quan v l s y dd G6c ddn nd V thay d i i quy ludt cua Cpng s u i t 26 (ppe dd G6c ma sdt du va b i l n dgng cd xem xet d i n MPa 0,5 Lye dinh kit du XPe cdc gid trj eua trgng thai Cpng m B 10 10: Chieu rdng c6ng trinh ngam s u i t nguydn sinh k h i i da m h 11 Chilu cao c6ng trinh nglm xung quanh cdc d u d n g h i m Deo Do dd, vide phan tich vd xem 12 Loai vdt lidu Mohr-Coulomb xet quy luat b i l n d i i c a hpc cd 13 Tieu chuin su-dung 0,5;0,75;1,0; chu y d i n s y thay d i i cdc gid trj 14, Hd so tpng suit nguydn sinh K = a3/CTl 1,25;1,5;2,0 Cpng s u i t nguydn sinh Id d i l u m 50 H 15 Dd sdu dat c6ng trinh ngam d n thilt , - Bdi todn c6 xem xdt d i n lugng ddt dd \/d trang thai Cpng sudt Thdng thudng vdi cae bdi nguydn sinh tcdn phan tich b i n g giai tich, KHCNM s o 3/2012* CNKT HAM LO Thong tin khoa hpc cong ngh^ mo Bing Cic gii trj Crng suit cr-f vi rr^ sau phin tich d cic vj tri khic xung quanh dwdmg him thay ddi /i$ sd Crng suit nguyin sinh K = tr^/cTf TT H^sd M^t cn/oi— K cit 1 K=0.5 K=0.75 w II III IV V VI VII VIII II III V VI VII VIII II III IV V VI VII VIII II III IV V VI K=1 iX K=1.25 vii K=1.5 ' ' K=2 , VIII II III IV V VI VII VIII II III IV UV _ ^„ VL _ i VII VIII ^ ^ Gii trj m, MPa & cic vj tri Gii trj $ sd Crng suit nguyin sinh K 'jr Bing phin m l m Phase 2, w\ , 'ill chung ta c6 t h i thu dugc sy J LV r phdn b l Cpng suit thCp sinh thing dCpng vd n i m ngang (dp lye) trdn mdt dan vj didn tich xung quanh edng trinh nglm vdi sy thay d i i hd s l Cpng suit nguydn sinh ban d i u nhu hinh vd Cae k i t qua hinh va cho thiy, ede gid trj a1 Idn nhit d g i n bidn him, giam d i n xa bidn h i m vd a3 se tang Hinh Phin bd uvg suit nim ngang xung quanh di/tmg ham d i n tCp bidn h i m vdo Idng thay ddi h$ sd Crng suit nguyin sinh K khii dd vd d vj tri x l p xi 2B (4R) sy thay d i i Cpng suit tip bidn cong trinh nglm Tuy nhidn, thi chung Id hing s l h i m vdo khii dd (hinh 3) thyc t l mdi tardng cd sy Nhu vgy, thay d i i he s l vd mii quan hd giOa biln dgng sai Idch khac v l ty s l Cpng Cpng suit nguydn sinh, ede gid ting t h i (exy) vdi hd s l Cpng suit thi dp lye tinh toan d i i vdi trj biln dgng cung thay d i i theo suit nguydn sinh ban d i u k Khi k i t d u ching eung thay dii Tuy nhidn, phy thupc vac eae thay d i i gid trj a3/a1 se Idm thay Phase ehi dilu mpt he s l Cpng suit nguyen sinh d i i gid trj biln dgng deo tgi bidn each ro rang, giup eho ngydi khde thi cdc gid trj biln Id vd sy phd huy quanh bidn thilt k l ed each nhin ting qudt dgng eung giam d i n tCp bidn him Oilu ndy cd nghTa rit Idn han, chlnh xdc han thilt dudng h i m vdo Idng khii d i i vdi qud trinh tinh todn thilt k l k i t d u ching giu da Cac gid trj biln dgng sau k l kit d u ching giu' sau ^ ^^x phan tich eung co t h i thu dugc Vi dy: Khi thay gia trj nhu bang Sy phan b l K = 0,75 v a K = 1,0 hinh dgng Cac phan tich chi ring, he biln dgng ting t h i xung quanh cua Chung g i n nhu can bang s l Cpng suit nguyen sinh ban dudng h i m thay d i i hd s l vd cd tinh d i i xu'ng N l u chip d i u anh hydng Idn d i n Cpng Cpng suit nguydn sinh the hidn nhgn ly thuylt vung d i t dd nCpt suit va bien dgng khii dit hinh 2,3,4 va, c6 t h i bj pha huy gay tai da xung quanh cong trinh Qua d6, ta e6 t h i thiy dugc trpng d i i vdi k i t d u ching giu' nglm N l u trang thai Cpng suit KHCNM s o 3/2012* CNKT HAM LO Thong tin khoa hpc cong nghe m d Hinh Quy lu$t bien ddi Crng suit thing dCrng (ben trii) vi Crng suit nam ngang (ben phii) theo sy biin ddi cOa hi sd K Xif: Il'Ii Hinh Quy luat bien ddi cua bien dang tdng the xung quanh dUKmg ham von sy thay ddi cua he sd Crng suit nguyen sinh K nguydn sinh ban d i u K xap x? b i n g (K« 1), u'ng, s u i t trdn bidn ndc va n I n cua d u d n g ham g i n n h u hay Id tai trpng cc tinh chat doi xCpng Khi K = 1,5 hay K = 2,0, gia trj Cpng s u i t trdn bien phia noc dudng h i m bj tang len Sau phan tich b i n g phan mem phase thi vung pha huy va vung dp lye d tren noc ham cung tang len, do, vung dp lye CO hinh dgng giong n h y ly thuylt cua P.M Tximbarevich Khi K < 1,0 vung ap lye d i t da CO hinh dgng t u a n g t y n h y ly t h u y l t tinh toan ap l y e cua M.M Protodiakonop Sau phan tich, chung ta cung cd t h i h i l u d u g c quy lugt bien d i i cua Cpng s u i t sau khai dao K i t qua cho t h i y , gid trj Cpng s u i t Idn n h i t nhgn d u g c K = 2,0 va nho n h i t K = 0,5 K i t qua cung hodn toan hgp ly vdi cac ly thuyet phan tich t r u d e day Nhgn xet cung la c a s d ban d i u 66 phan tich va tinh toan I n djnh cong trinh ngam c6 mgt cat ngang Idn, khai dao d i t da cd tinh phan Idp va thay d i i Cpng s u i t k i l n tao ban d i u / Tai lieu tham khao: NguySn Quang Phlch, Ca hoc di, NXB Xiy dyng, Hi Noi, 2006 Nghiim HOu Hanh, Ca hoc di NXB Xiy di/ng, Hi NOI, 2004 Nguyin Sy Ngpc, Ca hgc 6^ NXB Giao thdng V$n tiii Hi N0i 2009 V6 Trgng Hung, Phung Manh Die, Ca hgc di Crng dung xiy dyng cdng trinh ngim vi khai thic md, NXBKHKT, Hi Ndi, 2008 B.n AdpaM^yK, CH Bnacoe, B.M MocmKoe, nodaeMHbie coopy)KHUfi, nedpa, MocKea 2005 c - 464 B.M MocmKoe, cmpoume/ibcmeo nodaeMHbix coopyMeHuu do/ibuioao ceneHUP, MocKea 1963 c-307 B.A.Kapmo3UP, B.M OedyHeu, M.M lUynnuK, HD.H Maribiaiee, B.M CMupnoe, B.F flepnep, KD.n PaxManuHoe, A.B KopnaK, B.A OunuMOHoe, B.M PesyneHKO A.M fleeuuKuu, LUaxmnoe u nodaeMHoe cmpoumenbcmeo TOM 1, uadame/ibcmeo aKadsMuu aopHbix HayK, MocKea 2001 B.A Kapmo3Ufi, ocHoebi oceoenup nodaeMHoao npocmpancmea un/iiocmpauuoHHoe npuno>KeHue K KOHcnexmy neKuuu, Mrry 2006 - 2008 A.H naHKpamoHKO, O6OCHOeanue u paapadomKa napaMempoe pecypcocdepeaaiouiux mexHonoauu cmpoume/ibcmea nodssMHbix ebipadomoK 6onbujoao nonepe^Hoao ceneHUfi duccepmauufi, Mocxea 2002 10 Desai.C.S (1972), Introduction to the finite element method, New York 11 B.H.G Bridy and E.T.Brown (2004), Rock mechanics for underground mining, Moscow 12 Dimithos Kolymbas (2005), Tunnelling and tunnel mechanics, Spring - verlag berlin Heudelberg Germany 13 www.rocscience.com KHCNM s o 3/2012* CNKT HAM LO ... cung thay d i i theo suit nguydn sinh ban d i u k Khi k i t d u ching eung thay dii Tuy nhidn, phy thupc vac eae thay d i i gid trj a3/a1 se Idm thay Phase ehi dilu mpt he s l Cpng suit nguyen sinh. .. Hinh Phin bd uvg suit nim ngang xung quanh di/tmg ham d i n tCp bidn h i m vdo Idng thay ddi h$ sd Crng suit nguyin sinh K khii dd vd d vj tri x l p xi 2B (4R) sy thay d i i Cpng suit tip bidn... suit thing dCmg xung quanh dvimg ham thay ddi />$ sd Crng suit nguyin sinh K ''jr Bing phin m l m Phase 2, w\ , ''ill chung ta c6 t h i thu dugc sy J LV r phdn b l Cpng suit thCp sinh thing dCpng