Ky niem 43 nam thanh lap Vien Khoa hoc Cong nghe Mo Vinacomin I/NGH!EN,CUU AP DUNG KET CAU KET HOP SUT DUNG NEO VA NEO CAP NHAM NANG CAO HIEU QUA CHONG GIUTCONG TRINH NGAM Active support structure wit[.]
Ky niem 43 nam lap Vien Khoa hoc Cong nghe Mo - Vinacomin I/NGH!EN,CUU AP DUNG KET CAU KET HOP SUT DUNG NEO VA NEO CAP NHAM NANG CAO HIEU QUA CHONG GIUTCONG TRINH NGAM Active support structure with using reinforced anchors and TS TRINH eANG HUNG cable anchors has many dominant advantages However, KS PHI VAN LONG during its application, it is necessary to have some control KS NGUYEN VAN CONG methods for increasing its supporting efficiency and then, as a KS HOANG PHUONG THAO result, for orientating the support design and selecting the Vi$n Khoa hoc Cdng ngh$ Md - Vinacomin reasonable output and input parameters to increase the mutual assistance between reinforced anchois end cable anchors The Bien tip: TS Truxmg Dtrc Dif paper refers to some methods in the coordinate uWization of anchors and cable anchors for increasing the supporting efficiency at underground constructions and mine dnfts LDatvdndl Vgi nhung uu diem ca v l kha nang ching giu, an todn, gid thdnh hp cung nhu phpm vi dp dung, tLP Idu, k i t c l u chong Id bang vi neo da dugc O-ng dung rpng rdi vipc ching giu cac cdng trinh nglm, dudng Id md tren t h i gidi vd g Vi^t Nam Trong qua trinh phdt triln, da cd rit nhilu kit c l u neo dugc siJ' dgng thg'C t l Theo cc ehe chju tai, ngudi ta chia neo ma sdt, (neo nem che, neo Ing, ), neo dinh k i t (neo be tdng cot thep (BTCT), chit deo cit thep (CDCT), neo cdp, ) Trudc day, nhung loai k i t eau neo thudng dugc su dgng dpc lpp, nhien, qua thyc t l dp dgng cho thay, vipc su dgng mpt logi neo ehua phdt huy dugc toi da nhung uu diem cua k i t c l u chong neo Vi dg, ching giij" cdc Id dpc via chiu anh hudng cua dp Ig'C Id chg, hope cdc nga ba, ngd tu, khiu dp chong gii> Idn, n l u chi' su dgng den thuin neo BTCT hope neo CDCT, se khdng dam bao an todn Trong trudng hgp ndy, n l u su dgng neo cdp se giai quylt dugc bdi toan v l kha nang chong giu, nhi^n, gid ching Id se tang Hipn nay, a cdc nudc tidn tiln trdn t h i gidi, ngudi ta dd dua vdo dp dgng h0 kit c l u ching giu cdc edng trinh ngam cung nhu dudng Id md, vdi vi$c k i t hgp neo vd nee cdp Ket c l u ndy khdng nhQ'ng phdt huy dugc toi da uu diem cua tung Iopi neo, dam bao kha nang ching giu on djnh, an todn, md cdn giam gid thdnh ddo ching Id Bdi bdo ndu mOt s l phugng phdp k i t hgp su dgng neo vd neo cdp nhim ndng cao hipu qua chong giu cdng trinh ngam eung nhu cdc dudng Id cde md h i m Id Nguyen ly k^t hp'p neo cdp vd neo cdt thep vipc chdng g i u cdng trinh n g l m Neo cot thep (BTCT, CDCT) va neo cdp d i u la kit c l u chong chu dpng, chju Ig'C theo cc c l u bam dinh Trong dd, neo cot thep cd chipc nang chu yeu Id lien kit cac Icp da tao thdnh ban dam phia tren ndc Id, hgn che kha nang "freo" ching da ndc tach khoi nguyen khoi Doi vci neo cdp, dgc diem cc ban la chilu dai len, chu'c nang chinh Id "treo" da ndc len Icp vach cc ban Tu do, h$ kit cau ndy, neo cdp cd the tgo dugc dy ung Ig-c cao va nang Ig-c nhdn tai len, cdn hp thong neo cot thep xung quanh hinh thdnh ban dam vd dugc neo cap "treo" len vdch cc ban Nhu vdy, kit c l u ndy sg hinh thdnh dam t l hgp, bao vp da vach, han c h l djch dpng, ngan ngOa sy phdt trien cua vdm sgp Ic, khien cho lyc tdc dgng cua neo cdp vd neo cdt th6p lan can tucng hd cdng hucng, t l hgp hinh len mpt dam da mdi, vci day cung, cucng dp khdng cat cua d i m da tang len, ap luc ndc Id thong qua trg bao ve chuyin djch vdo sau bdn Thdng qua do, cai thien dilu ki0n chju lyc cua ducng Id, khing c h l hipu qua su djch chuyin cua dat da ndc va hdng Id So sdnh vci neo cot thep, thi neo cdp ed dp sau gia co va lye gia co len, cd the tao dy ung lyc khd Idn vd hang logt nhung yu diem khdc, ta mpt trpng nhung ky thugt quan trpng khdng t h i thilu gia co cac cdng trinh nglm cd dilu kipn khd khdn phi>c tgp Neo cdp cd cdc logi khdc nhau, nhu neo cdp dy ung lyc d i u KHCNM s o 10/2015* CNKT HAM LO Thong tin khoa hoc c6nc) nghe mo neo neo cdp dy yng lyc todn thdn, neo cdp phi dy Cmg lye todn thdn neo cdp vdi hinh thCre khde thi co che gia co chdng giy cung khac Trong dd neo cdp dy ijng lyc dau neo dugc sy dyng r^t bie'n Log! neo ndy chu y l u Id tdc dgng treo Neo cdp mang Idp d i t dd khdng on djnh Idp dydi treo vdo Idp d i t dd dn djnh d phia tren Ddng thdi, neo cdp cd t h i tgo dy yng lyc khd Idn, ed t h i keo cang vd dp chat cdc Idp dd, khe mit, nhijng mat khdng lien tgc, Idm tang len lyc ma sal giOa cde mat Idp, tip dd, nang cao cydng dd tong the khdi da Neo edt thep vd neo cap khdng phai ch? don gian Id tdc dgng ehdng giy kit hop gia eydng md Id ehdng giy tyong hS i l y ddi b l trg ngin, dac tinh cua hd 'ket cau chong-khdl di'vi die tinh eo hgc eua hd "neo cdt thep - neo cip" ed sy kit hop Trong dilu kidn dit da mdm y l u bd rdi, dit dd xung guanh dydng Id biln dang Idn, sau khai ddo ldp tCrc sy dyng neo cap, cd t h i dd ddn ddi cua neo cap bi vygt gud gidi han md dan toi phd huy Do dd, d giai doan diu, ddo Id th] ehi ldp dgt neo ed't thep, thdng gua tdc dgng gia cd eOa neo edt thep ma hg kit c l u chdng-khdi dd da cd khd nang chju tdi nhit djnh, eho phdp phdt sinh biln dang, gidi phdng mdt phin biln dang khdi dd, d i t da pham vi biln dgng nhit djnh cd t h i giO gin ty thdn dn dinh[3i Tuy vdo mye dg bien dgng eua d i t dd xung guanh md tdng Idn, khd ndng chju tai vd dg dn dinh cua hg "kit ciu chdng-khdi di" giam di, trydc tinh ty I n djnh cua hg "kit ciu chdngkhdi di" dat d i n gidi han, biln dgng dy cua dit da nhd bing dg dan ddi eho phep cIJa neo cdp, liic ndy tiln hdnh ldp dgt neo cdp se Idm giam nhd ydu clu v l dg ddn ddi cua neo cdp ddi vdi dit dd, bdo dam giO eho hg "kit ciu chSngkhii ifd"dn dinh (hinh b) Thdng gua hd neo cot thdp kit hgp neo cdp, se ndng eao dygc lye chdng giCf, giam biln dang eua d i t dd Neo kit hop neo cdp phdt huy uu t h i Iln nhau, dydng Id d giai dogn ddu khai ddo thi tinh deo cua neo thydng se dygc phdt huy, d i n giai dogn sau khai ddo thi tdc dgng treo cua neo cdp se dygc phdt huy hai tinh chit ndy tyong ho bd trg oho nhau, Ily ddi bd trg ngin, ty dg, md eai thidn tinh ndng ehing giy tdng t h i cua hg thdng, dgt dygc mgc dieh khdng c h l sg- biln dgng Idn eua dat dd Do dd tdc dgng ching giir ndy cd t h i ggi Id KHCNM sd 10/2015* CNKT HAM L tdc dung chdng giy tyong hd bo trg neo kit hgp neo cap Thdng gua tdc dgng ndy Idm tdng len tinh on tfinh vd khdng c h l s y phdt trien nCrt ne khdi dd xung quanh bao dam an todn san xuit Nghien CLPU hodn thien k i t edu chdng giu* cdng trinh n g l m k i t hQ'p neo vd neo cdp Chong giO' dyong lo la khdng c h l dat dd xung quanh biln dgng va tri bao vd dydng 16 Trong trydng hop chung ngodi cdc ylu td dia ky thudt qud trinh hinh thdnh tdi tnpng tae dgng Idn kit c l u chdng giy cdn chju sy anh hydng rit Idn cua mdt logt cac y l u td nhy; thdi diem ldp dyng kit eiu chong; dd cung cua kit clu chong; linh hogt cua kit c l u ehdng vd nhOng y l u t i khdc[2i Xu t h i hign Id sO dung kit clu ehdng giy chii dgng (tang khd ndng mang tai ciia khdi dd bao quanh cdng trinh nglm coi bd ph^n chju tdi chlnh la khdi dd tao thdnh hg vd ehdngkhli dd nhy neo, bd tdng phun, bom ep vu'a gia eydng ) Chdng giQ" bdng neo cd higu qua khdng c h l dygc biln dang cua d i t dd bao quanh hay khdng, ehii y l u la d logi hinh kit cau neo vd cdc tham s l chong giy dd hgp ly hay chya Trong dieu kign d i t da nhit dmh, mgt neo dydng kinh neo, chieu ddi neo ddi gia cd cua neo md tang Idn thi biln dang eua dit dd bao quanh dydng Id se gidm d mye dg khdc Trong qud trinh thilt k l eIn tong hgp xem xet gid thdnh chong giu' vd higu qua chdng giiJ ddp yng ydu c l u Idn nhit d ca hai phyong dign ky thugt vd kinh t l 3.1 Phin tich sv sip Id cue bd xiy chdng bang neo cdt thep ket hap neo cap Thyc td' tai mgt so dydng Id chdng bing neo kit hgp neo cdp da xdy sy phd huy cgc bp Od eao Id ndc eua dydng Id Idn hon dg sdu gia e l cua neo thydng nhyng nhd hon dg sdu gia c i eiia neo cdp Sau Id ndc dgi da sd neo cdp bi dirt, dogn gia c i neo cdp vdn lyu khii dd cdn Igi d trdn ndc cdn todn bd neo thydng bj roi xudng than neo thydng vd phg kidn van tit Nguydn nhan ehu y l u Id ndc Id: Trong qud trinh ddo Id I l p d§t neo vd neo cdp cdng vdi thi edng Id chg, md men dy Cmg lyc i l p dgt neo Id lOON.m, sinh dy i>ng lyc rit nhd (10 - 15kN) khdng ed tdc dyng ching giO chu ddng khdng t h i khing c h l hidu qua dit da Ky ni$m 43 nam lap Vi$n Khoa hoc Cong ngh$ Mo - Vinacomin biln dgng thdi ky d i u Nhyng dy yng lyc eiia neo cdp r i t cao (khoang 80kN) d i n tdi tai trgng thdi k^ d i u ching glQ' t$p trung vdo neo cdp cdn neo cot thep mat dl tdc dgng chu dao chju tdi Trong qud trinh ddo Id biln dang elp tdc cua d i t dd neo va neo cap d i u bj keo dan ddng thdi lyc kdo cung tdng len Nhyng dan ddi cua neo cdp r i t thip dd dan ddi eua neo thydng rit cao dd biln dgng eiia logi chenh Igeh Idn, khdng thich ling vdi kha ndng bien dgng eua d i t dd, ca qud trinh ching giy khdng the ddng bd chju tdi khdng hinh hop lyc idm t i c dd tdng tro lyc len neo cdp qua nhanh lye keo cila nd vygt qud gidi hgn se bj dCrt cdp d i n tdi sgp td ndc Id ma neo thydng v i n khdng t i n hgi gl Cho ndn ehing giy k i t hop neo cot thep vd neo cdp dgt dygc hieu qua ching giir ly tyong c i n phai phii hop ian kha nang biln dang cua ca hai logi [4] thudc vdo tCrng logi cap, cdng nghd c h l tao, tieu chuin san xuit Dg dan dai cua sgi thep neo cdp va k i t c l u cua nd cd m i i quan hg r i t Idn, thing thydng neo cdp van hay sy dgng cdp 1x7 dg dan ddi chi Id khoang 3,5% thich Crng vdi kha ndng biln dgng cua d i t dd, nhyng rit khd thich Crng cung vdi neo eha't deo cdt thdp Ngdy logi cdp mdi c h i tgo quy each sgi cap thep Id 1x19, ed nhieu sgi hon, rdt yu vigt ddi vdi ket c l u cdp thep kieu soi, dg day ddc cua kit c l u t i n g t h i vygt xa mat dg k i t c l u cdp thep 1x7 ndng cao dp on djnh, vCra bao dam dd cCrng vya lam tang he s i tinh mem cua cap bdo dam gian tien thao tdc tgi hign trydng, dd dan ddi khdng nhd hon 7% ndng cao thich Crng kha nang biln dgng kich lidt eua d i t dd ndc Id 3.3 Phdi hap diiu chinh lech thdi gian thi cdng neo vi neo cap Quan hg tdc dgng tyong hd cua he ehing 3.2 Didu chinh ket du sal thdp, ning cao dd giy-khii da dygc thd' hidn nhy hinh Dydng dgc tinh co hgc cua neo cdp (4) vd dan dai cOa nd neo cip Lyc keo dyt cdp vd kdt c^u sol cdp thdp cua dydng dde tinh eCia he "ket cau chdng-khdi di" neo cdp ddng vai trd rd't quan trgng Neo cdp (3) vd dydng dac tinh co hgc cua kit c l u ching Ilp dgt se tgo mdt dy Crng lyc can thiet Trong giQ-thdng thydng Id khdng gidng nhau, nang lyc cdp se xuit hien lyc cdng T Trong pham vl biln nhan tai cua he kit c l u ching-khii da Id tiiy vdo dgng dan h i i quan hd giya T vd dd dan ddi cua biln dang tang Idn thi khd nang chju tai se giam cdp Al Id ty ig bac nhit Cdp dang d trang thdi ty di Dydng cong 11d dydng ddc tinh khii dd, bleu do, gap tryong hop d^t dd biln dgng kjch ligt, thi m i l quan hd giya eydng dd ching giy va cdp cd the' se bj dan ddi, vygt qud gid th gidi bien dgng d i t dd Dya vdo nhyng phdn tieh trdn, hgn, dd lyc cang cdp T > T] [T] -Lyc n l u dydng dgc tinh cua he kit eiu ching giy kdo dCrt gidi han cua cdp) Sy gidn edng ndy phg khii dd vd dydng dac tinh cua neo cap khdng jBien dang cua dat da| |)i£n d ^ R cua ddt da| Budng die tinh dit di: Dudng die tinh ching giO kit hap neo vi neo dp Uo - Dich chuyin hi mit dudng Id: Budng die tinh cOa hi kit eiu ehing - khdi di AL -Bddin dii cua neo dp: Budng die tinh neo cip Hinh Quan hi tie dung tuong hi kit ciu ching vi dit di KHCNM S 10/2015* CNKT HAM LO Thong tin khoa hoc cong nghe md ^^^^^Hmh^Hinh 'inh'neo cip' t h i cung vdi dydng eong giao cat dilu dd eho thiy ddc l^p su' dgng neo cdt thep hodc die ldp sO dung neo cdp d i u khdng the khing c h l dit dd dat dygc i n djnh Nlu ehing giy neo cit thep vd neo cdp kit hop, dydng dgc tinh edng tdc dgng ehing giy vd dydng eong giao nhau, bilu thi ehing giu kit hop neo cot thep vd neo cdp da nang cao kha ndng chiu tai cua hd kit c l u ehing, tgi dilm giao elt, biln dgng cua dit dd dgt dygc sy khing c h l bao dam tri dg i n dinh eiia dat dd xung quanh dudng Id [4] Nhy vdy se ed hai trudng hop: neo cdp se dygc ldp dgt sau, dd, neo c6t thep vd neo cdp khdng ding thdi cCing tdc dgng gia eydng, ma Id tyong hS lay ddi b i trg ngan, tCr dd eai thign dygc r i t nhilu tinh ndng ching giQ' ting the hd thing ehing neo, thyc hign dygc tdc dgng khing c h l d i t dd biln dgng Nguyen ly tdc dung tuong ho chong giO nglu hgp lan 2, neo cap lap dgt sau neo cdt the'p (hinh lb) Trong cdc dydng Id dgc via phdn tang sau ktii khai ddo, t i e dd bien dgng cua d i t dd khong ngyng thay ddi, thydng trai qua giai doan: giai dogn anh hydng cua qud trinh dao Id, giai dogn on iflnh vd giai doan anh hydng cua hogt ddng khai thde Giai dogn anh hydng ciia dao Id trydng Crng suit nguyen sinh phdn bd Igi, tic dO bien dgng nhanh, ydu c l u ddi hdi neo edt thep vd neo cdp cd dan ddi khd Idn d l thich ling vdi biln dgng d i t dd, eho ndn, thyc t l thi cdng, cung vdi viec thi cdng gyong Id ehg, ndn c i n tgo cho neo cdt thep m i t dy yng lyc kha cao, khdng c h l biln dgng sdm cOa dit dd C6nneo cdp th) nen thi cdng lap dgt sau neo cdt thep, biln dang e l p tdc chuyin sang biln dgng ehgm din, dd Id giai doan t i t nhit dd Ilp d|it neo cap 3.4 Phdi hap thuc hiin diiu chlnh dd Idn du ung tuc neo va neo cip Trong ehing giO k i t hop neo edt thdp vd neo cdp, neo cdt thep khing c h l bien dgng vd tacli Idp dit dd ndc phgm vi gia c i ciia nd, vdo biln dgng vd tdch Idp dd't da' ndc Id tdng len, neo bj dan ddi, neo a qud trinh kdo dan, - Trong tm'dng hop neo vd neo cdp ddng lye kdo cung tang Idn kha nang khing chl liiln thdi dygc Ilp d^t (hinh la), bdo dam tiln d l dang d i t da eung tdng len Do phgm vi gia c6 thdnh edng ehing giu' neo kit hop neo cdp la cua neo cdp bao hdm phgm vi gia c i cua neo cdt d i t dd xung quanh dat dygc 6n djnh d i biin thep, eho ndn neo edt thep d qud trinh kdo dang Uo nhd hon dg ddn ddi gldl hgn eOa neo dan thi neo cdp cung bj kdo ddn Trong qud trinh cdp Thda mdn dilu kien tinh i n djnh eua dat dd thi edng thyc t l nen tgo dy lyc khd Idn eho neo thi trydng hop ndy ndi ehung Id khd tdt cdt thep, giam thd'p nhat biln dgng vd tdch idp dd cd t h i thdng qua lya chon hgp ly ede thdng cua d i t dd neo cap nen tgo dy Crng lyc nhd d l s i vd quy cdch neo d l sir dung neo ddc Igp ed biln dgng vdn cdn dy neo cdp d l thich t h i bdo dam tri dd i n djnh eua d i t dd Crng vdl biln dang va tdch Idp giai dogn sau ciia - Trang tnfdng hgp dydng Id qua d i t dd mIm d i t dd I"' Cdng thCrc suy ludn dilu kidn phii hgp ylu vd ndc Id rdi vgn mCre dd biln dang Idn giai kha nang bien dgng neo cdt thep va neo cdp nhi/ dogn diu khai ddo dydng Id tiln hdnh ehing giCr sau: bing neo cot thep, chu y l u dya vdo tinh mIm Khi khing dy Crng lyc: eiia neo cdt thep, md giai doan sau khai ddo mdi Pamax ~ K « Aimax phdt huy tdc dgng treo ciia neo cdp Cd nghTa Id, Pgmax = Kfl Z^gmax KHCNM Sd lOaOlS* CNKT H A M L Ky ni$m 43 nam Ijip Vien Khoa hoc C6ng n g h j i>^6 - Vinacomin K=' nYld'a^, Khi ed dy ung lyc: Psmax = Pso + K s A s Pgmax — Pgo + K g A g Bat tudn cd hay khdng cd dy ung lye, gid tri K d i u Id khdng thay d l i , dd dilu kipn phii hgp khd nang biln dgng Id As=Ag, tuc la dlng khai thdc t i i da kha ndng mang tai cua khii dd gia cudng Ching giu kjp thci ngan can dugc hipn tugng sdm tdch Icp vd ed t h i tgo dugc dy ung lyc, ndng cao kha ndng chju tai cua dat da xung quanh Dam bao tri dp I n dinh eua ducng Id, ndng cao chdt lugng ching giu Tren cc sd phan tich qua trinh biln dang dat da xung quanh ducng Id, nhdn t l anh hucng ehu y l u d i n biln dgng phd huy dudng Id ehing neo bao gom: Tinh chat cc hpc cua d i t dd, Cpng suit d i t dd xung quanh, tinh ding nhit lien khoi cua khii dd tilt dipn ducng Id, v$t lipu vd k i t c l u ehing giO, anh hucng tu ban than Id ehg khai thdc vd Id chg Idn cgn Trong d6, nhung thdng sd' cua hp ket cau neo cdt th^p k i t hgp neo cap Id rdt quan trpng, nhu lua chpn dp dan dai eua cap lam neo; dieu chinh l$eh thci gian thi edng neo cot thep vd neo cdp; dieu chinh dp len dy ung lye neo cot thep vd neo cap, de cho hp ket eau Idm vipc hi#u qua nha't, phd huy dugc t i t ca cdc Igi S\em eua hai logi neo Ti> dd, gdp phin eho vipc (^nh hudng vd nghien cuu sdu de toi uu hda cde thdng s l thilt k l vd thi cdng dao ching, lya chpn hinh thuc vd vd cde tham so ching giu thich hgp, nhdm ndng cao dp on ^inh eua dudng Id, dam bao an todn va hipu qua kinh t l ky thudt./ Trong dd: Psmax, Pgmax - Khd ndng chiu tai gici hgn cua neo cdp vd neo cot thdp; Ks, Kg - H# s l nh^n lyc neo cdp vd neo cot thdp; Asmax, Agmax- Bq dan ddi gidi hgn cua neo cdp va neo cot thep; ds - 0ucng kinh sgi cdp thep neo cap; n- So sgi thep neo cdp; dg -Ducng kinh neo cot thep; 5bs, 5bgrdi li^u tham khio: Cudng dp gidi hgn v^t Ii$u neo c6t thep vd neo cdp; U, Ig - Chilu ddi nep cap vd neo cot thep; [1] Trinh Dang Hung, Ndng Vipt HCing, 5s, 5g- Dp dan ddi cua neo cdp va neo cot th6p; Nguyin Thj Thu, (2013) Nghidn c&u su- dung Pso,Pgo - Dy ung lyc neo cdp vd neo cdt thep neo kit hop neo cap chong gid cong trinh Ndng cao dO b i n cua hp neo cot thep ket hgp ngim, mo {J] Tgp chi Cdng nghipp md [2] Trinh Dang Hung, Chen Chang Hua, Song neo cdp d l i vci hipu qua chong giu rat quan trpng, dy i>ng lyc eua npo ed tdc dgng quylt Jia Lin, (2012), Active support works in underdjnh, gay cho neo mpt dy ung lyc khd len, ground mining construction execution and trends d i n g thci, thdng qua t i m dpm, nep vd of its application, Proceedings of the 4th InternanhCmg c l u ki^n khdc, thyc hipn l^uech tdn dy tional symposium on mine safety China Liaoning ung lyc Id phucng phap hij'u hipu nang cao hipu Technical University qua ehing giu neo Phii kit hgp du ung lyc hdi [3] Zhaoqing Biao, Houchao Jiong.Manian hda giua neo cdt th6p vd neo cdp d l ching giu Jie, (2015), Phuang phap tinh toan vi nguyen iy d i t da xung quanh dudng Id dugc hipu qua bo trq chong giCr neo va neo cip Tgp chi Oai hpc nhit Cdng nghp moTrung Quoc K i t lu$n [4] Wangfei Hu, (2001), Nghien ciru phuang Cdng nghp ching giO su dgng neo cd't thep phip xic dinh cic tham so thiit ke va ca ly k i t hpp neo cdp cdc dudng Id md cho thiy chong giu neo di/ ung iuc cong trinh ngam hi|u qua rd r#t Ld m$t logi hinh chong giQ- chu Dpi hpc Cdng ngh$ Tdy An, Thilm Tay, Tdy An KHCNM SO 10/2015* CNKT HAM L ... lyc neo cdp vd neo cdt thep neo kit hop neo cap chong gid cong trinh Ndng cao dO b i n cua hp neo cot thep ket hgp ngim, mo {J] Tgp chi Cdng nghipp md [2] Trinh Dang Hung, Chen Chang Hua, Song neo. .. ket cau neo cdt th^p k i t hgp neo cap Id rdt quan trpng, nhu lua chpn dp dan dai eua cap lam neo; dieu chinh l$eh thci gian thi edng neo cot thep vd neo cdp; dieu chinh dp len dy ung lye neo cot... nh^n lyc neo cdp vd neo cot thdp; Asmax, Agmax- Bq dan ddi gidi hgn cua neo cdp va neo cot thep; ds - 0ucng kinh sgi cdp thep neo cap; n- So sgi thep neo cdp; dg -Ducng kinh neo cot thep; 5bs,