Thông tin tài liệu
SCf DUNG TRI/ONG UNG SUAT PHAN TCT HOfU HAN TfNH TOAN H£ S AN TOAN N OINH MAI DAT TS Nguyin Bio Viet Khoa XSy dt/ng Ciu dudng Trudng Dai hgc XSy dgng Tdm tat: Trugt Id dit IS hidn tugng mdt khdi dit dS nSm trdn mdt mSi ddc bj djch chuyin cd sg phS hogi dgc theo mdt mSt trugt nSo dd mSi doe ThiSt hgi vi vSt chit vS ngudi IS rit Idn vS khdng thd ludng duge Hidn vi$c phSn tich tinh toSn Pn dinh mSi dit hiu hit ddu dugc thu-e hidn bing eSc phuong phSp truyin thing nhu phuong phSp Bishop CSc phuong phSp nSy ddu dugc xSy dung trdn co sd cOa ly thuyit cSn bSng gidi h^n, dd nd khdng xdt din dugc mdt si yiu td nhu modul bidn dang E, hd s6 poatxong p, h$ sd dp /uc tTnh Ko Vdi vipc phSn tich sg phSn phPi ung suit dit bSng phuong phip phin tif hCru hgn vS tinh toSn h$ sd an toSn tdng thi trdn trudng ung suit nSy cSc yiu tP mS cSc phuong phSp truydn thing khdng thi xdt din dugc sd dutyc dua vSo tinh todn Kit quS tinh toSn chi ring vdi trudng hgp mSi dit dSo, h$ sd an toSn tPng thi tinh toSn theo phuong phSp kit hgp nhd hon khS nhiiu so vdi cSe phuong phSp truyin thing Summary: Landslide occurs when a soil mass moves on a soil slide caused the failure along the slip surtace Landslide damage is well known very tremendous Basically soil slope stability is analyzed by one of some conventional methods such as Bishop, M-P, which based on limit equilibrium theory Therefore, conventional methods can not consider some factors as Poisson ration, deformation modulus The stability analysis based on the stress field obtained from FEM analysis ean take into account the factors, which is out of stability analysis in the conventional methods The example results showed that in case of excavated earth slope, overall factor of safety calculated by the method based on FEM stress field is lower considerably to that of conventional methods TONG QUAN VE ON DjNH MAI DOC Mdi dde ty nhidn cQng nhu mdi dde nhdn tgo d i u eo t h i bj m i t dn djnh vd bi trupt Id vdi nhiiu nguydn nhdn khde nhu: trpng lupng ban thdn; tai trpng edng trinh; hay su thay ddi eda cdc y i u td dja chit, thdy vdn Nhin chung sy m i t dn djnh ndy Id cdc biin dang cit chdng phdt trien thdnh nhu'ng mdt trupt lidn tyc 1.1 H$ s6 an todn tdng t h i O i ddnh gid dp 6n djnh cda mdt mdt trupt mdi d i t ngudi ta sd' dyng ty sd giQ'a kha ndng chdng c i t dpc theo mdt trupt Tf vd lyc cdt trdn mdt trupt T Ty sd ndy dupc gpi la hd sd an todn eda mdt trupt dP Theo thuyit bin Coulomb, hd sd an todn cd the dupe xdc djnh theo cdng thi>c: ^ _ T, c + otanjip) TAP CHf KHOA HOC C O N G N G H $ XAY DUNG J, Sd02 -12/2007 75 Trong dd: c, ep - thdng sd ddc trung ehdng c i t cda dit; a - irng suit phdp; T - Ung suit tiip (edt) + Fs > Mat trupt d trgng thdi dn djnh; + Fj < Mdt trupt bj phd hogi; + Fs = Mat tn^pt d trgng thdi cdn bdng gidi hgn, mpi vide Idm tdng cdc luc gdy trupt hay giam kha ndng chdng trupt d i u Idm khdi d i t bj phd hogi 1.2 Cac phuHyng phap phan tich 6n djnh dira tren ly t h u y i t can b i n g gid^i han Hidn ede bdi todn dn djnh mdi ddc thudng dupe giai bdng cdc phuang phdp dya trdn ly thuyit cdn bdng gidi hgn vdi cdc mdt trupt gia djnh Cdc mdt trupt gia djnh cd thi cd dgng dudng thing, dudng g i p khdc, dudng cong logarit Tuy nhidn dang cung trdn vdn dupc sd' dyng rpng rdi nhat tinh dan gian vd tuang ddi chinh xdc da phin cdc kit qua tinh todn Tu vide gia thiit trudc dgng mdt trupt Id phing, try trdn hay hdn hpp d i phdn tich tim h$ sd dn djnh cho mdt trupt nguy hiim n h i t Cd hai phuang phdp sd" dyng phd biin nhu sau; + Gii thiet mSt trurgrt try trdn vi hp s6 6n dinh t6ng quit: Ddng phdp thd' din phuang phdp vdng trdn ma sdt d i tim mdt trupt nguy hiim nhit vd hd sd dn djnh tuang d'ng Phuang phdp ndy dupc dung vdi trudng hap nin ddng nhit + Phuang phip phin minh khdi tnrgrt: qua vide khao sdt diiu kidn cdn bing md men hay cdn bdng lyc cda td'ng mdnh tCr dd tim hp sd on djnh chung cho mdi ddc Do sd luang i n sd nhiiu han sd lupng phuang trinh cdn bdng ndn giai bdi todn thudng kit hpp vdi cdc gia thiit v i tuang tdc lyc trdn tung manh Cd hai Idi giii phd biin; Hinh Mpt trugt tm trdn vS phSn minh khPi trut/t Phuong phSp cda Fellennious: Gid thiit ring tdng nhQ'ng lyc tdc dyng tuang hd giQ'a manh thu i vdi i-1 vd i+1 cd hudng vudng gde vdi bdn kinh cung trupt tgi minh i, vd bing Hd sd dn djnh cho mpt mdt trupt xdc djnh: n cLa + tgtp^Wi cos a^ - u^t^, Fs= ^ Y^wi-sinai (2) (=1 Hinh CSc thSnh phin Igv tuang tSc trdn minh thir I 76 Phuong phip cQa Bishop: Gii thiit ring tdng nhfrng lye tdc dyng tuang hd giQ'a manh i vdi cdc manh (i+1) vd (i-1) cd hudng n i m ngang vd bdng Cho k i t qua hd sd 6n djnh cho mpt mdt trupt: TAP CHf KHOA HOC CONG N G H ^ XAY DUNG sd 02-12/2007 8- 10' 12 14 -16 18 20 22 24 -wnt; J 10 12 14 16 18 20 22 24 I L 3 6 42 4 Hinh PhSn tich 6n djnh mSi ddc bSng phuong phSp Bishop ^[cAx, +(w, -u,x,>g • "T.^ ' • - '• • '.fy ' ^" •^ i 45 ; ' i; \t ,,;'.-; iO 1- I nt.-l 35 • ••• t —•• i — i »* J: IT I ! : ! l,.-i-: 1 J l , i f i i i i ! ! i i i J S 10 12 14 16 18 20 22 24 26 28 X 32 34 36 38 40 42 " - 44 46 Hinh PhSn tich ung suit-biin dang bSng phuang phSp PTHH 78 TAP CHI KHOA HOC C O N G NGHE XAY DUNG sd 02-12/2007 u g 10' 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 26 46 48 50 26 24 24 22 22 20 ' 20 18 — 16 18 16 14 14 12 12 10 10 fni 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Hinh PhSn tich 6n djnh mSi dSc trdn trudng ung suit PTHH CQng vdi diu bdi tuang ty, tdc gid dd tiin hdnh tinh todn phdn tich bdi todn dn dinh bing vide sd' dyng phuang phdp phin tu- hO-u hgn vdi md hinh nin bdn khdng gign biin dgng tuyin tinh (elgstic), modul SigmaA/V, d i phdn tich sy phdn phdi ung suit mdi dit Sau dd hp sd an todn tdng thi duac tinh todn dya trdn trudng ung suit phin td' hQ'u hgn dd bing modul SlopeAW 3.1 Phdn tich 6n djnh mdl ddc khong c6 vd cd tai trpng ngodi Bing H$ sP an toSn ting thi cd xdt din tii trgng ngoSi Ht SO AN T O A N T O N G THE CO X E T O E N T A I TRQNG NGOAl Phuang phdp truyin thdng (Ly thuyit cdn bing gidi hgn) Phyang phdp sd" dyng trudng ung suit PTHH Ordingry Bishop M-P H=0.28; E=1000T/m^ Sai sd Trudng hpp (tdi trpng bdn thdn) 1.259 1.408 1.405 1.391 1.01% Trudng hpp (P=5T;x=0) 1.218 1.364 1.364 1.351 0.96% Trudng hpp (P=5T;x=3) 1.190 1.351 1.348 1.321 2.04% Trudng hpp (P=5T;x=6) 1.212 1.379 1.368 1.347 1.56% Trudng hpp (P=5T;x=9) 1.259 1.408 1.406 1.394 0.86% TAP CHf KHOA HOC C O N G N G H $ XAY DUNG sd 02-12/2007 79 Ta ed t h i nhdn thay giu'a hai phuang phdp h i u nhu khdng ed sy sai khdc mdc dO phuang phdp tmyin thdng khdng midu ta chinh xdc sy phdn phdi ung suit tai trpng ngodi gdy D i i u ndy chi ring phuang phdp tmyin thdng hodn todn ddng tin cdy cdc bdi toan cP tai trpng ngodi tdc dyng 3.2 Phan tich dn djnh mdi ddc vd'i cac loai d i t co he sd poatxong khdc Bang Anh hudng cOa hd sP poatxong tdi h$ s6 an toSn tdng thi A N H HU'OfNG C O A H E S O P O A T X O N G TO'I H E S O AN T O A N T O N G T H f Phuang phdp truyin thdng Trudng hpp (tdi trpng ban thdn) Phuang phdp sd" dyng trudng ung suit phin td' hQ'u han (E=1000T/m^) Bishop H=0.25 H=0.28 H=0.32 ji=0.35 1.405 1.384 1.391 1.401 1.410 1.52% 1.01% 0.29% 0.35% Sai sd Kit qua tinh todn mdc dd cho thiy cP sy anh hudng cda hd sd poab
Ngày đăng: 29/11/2022, 14:02
Xem thêm:
