chuong 6.PDF

CHUONG 6.CACTHINGHIEM KHAC 191 CHUONG cAc THiNGHlEnlt rHAc o.r.rHirucnlf;wr cAr cANH(vsr) 6.1.1 NcuyEttlY rH[ rucHlEtr,r Thi nghiOmcit c6nh (VST-VaneShearTest)duoc phdt minh vio ndm lglti tai Thuy Di€n vi ngdy v5n rdt th6ng dung chAuAu Ta c6m v)o rrong ddt s6t mot c6nhchfr thApbang th6p,sau d6, quay ciinh chti thApquanhtruc cira n6 vh m6men xo6n.Ta tinh duoc rirrgsudttidp t, tir d6 c6 sLlckhiing cat khong tho:it nuric S,,(tuc lI = 0) c") ciraddt s6t (rp,, Thf nghiOmniy khong phi hon v6i dat crit vi cricnguyOnnhansau: Lu6'ixuy6n rat m6ng, v) v4y kh6 xuyOnvlo dat ciit Vdi ddt s6tkh6ng thoiit nudc,ta c6 thd slryra duoc S,,v) S.= x Cdn v6i dat cirt,ta c6: r = o-'htg )t h i t d yL / B = mong coc Theo Schmertmann(moi loai ddt): q : D a n gJ / g o :b i n g _chi6u CPT s a u n g a md : b Jttorg_qle-nQlIffl lang 2.5, bins 3.10 vd hinh 3.i9 (3.22) PHAN PHULUC 203 B a n gP C c u n g d u n g t u t h i n g h i G mD M T T h i n g h i e m n n n g a n g m f r i x u y e n - D i l a t o M e t eT r est Nguy€nlyi: irp luc lric mdngth6pkhdngchuy€nvi l)r po; iip luc lfc mlng th6p chuy€n vi ngoli l , l m m ( d o k h i n nd a y r a ) l d p , ; l.l mm 6p luc lfc ming th6ptro lai vi tri ddu l) p - Pr-Po P o- u o Po -Uo untso nirT = 34,7 -uo , , _ -p z uD - Po -Uo H i n h4 H i n h4 K o = ( K o / | } * ) o o t0- , n= , v i s e t t h u d n g ; = , v i s e t n h a yc i m O C R = ( [ ] oK o ) ' ' ' o po= 0,5 v6i s6t thudng; = 5v d i s t n h a vc m = , 2 o ' , , ^O C R O ' B Cactinh chdt co l! theo Mar- =28+14.6 = 71"eI t.,^, cmzls kr,- Cr, yn,ro" / Mr, (4.13) chetti M=R"Eo; R " p h il n h o n , l o< , : R r ,= r , 4+ , l o g K o l o >3 : R r u r = , 2+l o g K o 0,6 , ) : K n= , 8K n o G.20), set tr6 (S, / o u o< , ) : O C R = , K D ' / '.,^ s e t q i d ( S ,/, o > , ) : O C R = , K n l ' 1 (4.21) (4.22\ M a v n eO : C R = , 1K " (4.23\ 40 + 23Ko+ (152 - B6Ko)(1- sinq')- 717(1- sinq')' 192 - 717(1- sintp') (4.24) giA khrlc Koc6t -(Kgo'uo *u.,) c -Pl "tl (4.27) Nc q " = ( , 7 5- , 1 1l o )( p ,- p o ) n u l o< , S0c chiu q " = , 1( p , p o ) tAidoc coc nen Qp n d u , > l D> , = koi Pt vdi: phdn A F l k o ,= , n u E u > M P a k , ,= n d u E " < M P a Theo Robertsonvd cOngsul: / \033 P=0,5P"llLl Iv./ (4.2e) D d t d i n h :P , = N oS , D D d t r o i : P , = m i n ( , t ' u o[ D ( K p- K " ) +z K ot g q ' t g [ ] ; o''uoD [Ko3+ 2KoKp2tg