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SLP dung phwo>ng phap thiFc nghiem xac djnh he so nen moi tru''''ang san ho chju tai trong dong dang xung Use of the experimental method in determining coefficient of subgrade reaction of coral medium un[.]
SLP dung phwo>ng phap thiFc nghiem xac djnh he so nen moi tru'ang san ho chju tai dong dang xung Use of the experimental method in determining coefficient of subgrade reaction of coral medium under pulsed dynamic load Ngay nhan bai: 15/9/2014 Ngay su^ bai: 5/8/2015 Ngay chap nhan dang: 10/10/2015 Nguyen HCTu The Nguyen Cong Nghj TOM TAT Bai bio trinh bay ket qua thi nghi?ra hien trifcJng xac dinh ip liJc va vin toe lan truyln ciia s6ng nen moi tnidng cat san ho chju ip lUc song nen dang xung Til gia tri v|n toe lan truyen ciia song nen se xac dinh dilOc mo dun dan hdi dpng cua nen san ho chiu ap lite giy tii dang xung Tii kh6a: ap lUc sdng nen, nen san ho, van t6c lan truyen song I.DATVANO£ Hien tai mdt so dio thudc Quan d^o Tru'dng Sa dang xay ciung phuong an quy ho^ch vj tri bai tap k^t cic phuong ti$n ca gidi phuc vu nhi^m vu huin iuySn v i sSn sang chi^n diu, hoac dudng bang sin bay Tuy nhien d phia dUdi nhCfng khu vifc thudng da b6 tri cac cdng ngam dat d sau tif den m so vdi Idp be mat Do vay viec nghiSn cu'u qua trinh lan truyen song theo phuang diJTng qua trinh khai thcic cac phuong tien ca gi6i den cac c6ng trlnh nim moi trUdng san h6 c6 i/ nghia khoa hoc v i thuc tien rit cao O A T BAI T O A N V A N O I D U N G T H I N G H I E M ABSTRACT: The article presents the result offieldexperiments determining pressure and propagation speed of compression wave in the coral sand medium under the pressure of pulsed compression wave Based on the value of the propagation speed of compression wave, the author determines the dynamic elastic modulus of the coral foundation under pulsed load pressure Keywords: the pressure of compression wave, coral foundation, propagation speed of wave Nguyen Hflu Thi Nguyen Cong Nghi DT: 0904959555 Email: theppcSmta.edu.vn 2.1 Dat bai todn Hien c^c phuOng i n quy hoach vj tri phuc vu nhiem vu huin luyen cac phuong tien ca gidi ho|lc md rong sSin bay, nhim cCing c6 vk gicr vOng dio IS mot nhu cau m?ng tlnh cip thi^t Tuy nhlfen, d phia dudi cac khu vUc tr4n thudng bd trf mdt sd cdng trinh ngam phuc vu cho nhiem vu huan luyen va sSn s&ng chien dau cua cac dao Do v|y nghien cilu qua trlnh lan truyen ap lUC sdng nen va xac dinh van toe ci^a song theo phuang thing dilng ip lUc dang xung gay cd ^ nghta khoa hoc va thUc tien cao, 2.2 N6idung th! nghiem Sir dung bai san ho tai dao Son ca thudc Quin dao Trudng sa d^ tien hanh thi nghiem qua trinh lan truyen sdng theo phuong dirng SCr dung 03 d i u ap life 64 i p lUc sdng tai 03 vi tri gom: vl tri 1, VI trf Vj trf cich 30 cm mdi trudng San hd {theo Hinh 3) Sis dung qui nang d^ th^ roi cic khoing each khac de g^y t i l ddng len be mat san hd, vh lan truyen sdng nen den cic d i u ap lUc, Tif cac gia tn ap life nhan dUoc va khoing cich giCta cdc vj tri ta ^*m^tlHlt¥t*ft Hinh3.Sacl6botrl03daudD i2.2oisBsiii:nHn|35 xdc dinh dUdc g i i tr| v i n tde sdng lan truyen va ap lUc tai c i c vj dat dau t r o n g mdi trudng hd chua bao hda nudc 2J.1 Thiitbi thi nghiem 66 THI AP u ^ { ^ U BO oz a) M i y d d n g Nl 5CXI-1000DC M i y ddng da kenh Nl SCXI-1000DC \h thiet bi ddng da kenh h i f n d^i hang National Instrument cua My c h ^ tao Toe dp I i y m i u ciia m i y cd t h ^ dat tdi 9600 mau/s vd^ mile nhieu cifc thap Tren m i y b d tri khe c i m diing d ^ c i m c i c loai cac khac Cac loai cac n i y cd t h ^ duae rat n h i i u c i c ph^p k h i c nhU gia tde, bien dang, chuyen vj, d i | n ap May Nl SCXi-lOOODC dUoc dieu khien hoan todn b i n g m i y tinh thdng qua ket ndi USB Phan m^m dieu k h i l n LABVIEW \h mdt p h i n mem - phan tich ndi tieng tren the gidi b) O i u i p lire san hd KEX-1MPA D i u KDC-PA l i d i u i p li^c san hd cd k h i nang chdng an mdn mdi trudng nUdc b i l n D i u n i y t h u d n g duocsijrdungde i p life cOa sdng T\& mdi trudng san h d Vci dp lUc sdng n6 t i c dung len k i t c i u cdng trlnh Ap luc tdi da cua dau kieu KDC-IMPA la MPa Hinh5,Bi?ud6aplucdaudo02 o THI AFIVC-BAU QO 03 Trong thf nghiem, d i u dUdc sit dung d l i p lue sdng nen lan t r u y l n tif tr@n b l m i t san hd d i n eic vi tri dat dau 1,2,3 mdi trUdng san hd T h i l t bi g i y t i i l i q u i nang cd lUpng 15 Kg dUoc t h i roi tif dd cao t t f , m d l n l , m , 2.2.2 C6ng fdc hi^u chudn Bcil l i m thi nghiem duoc chgn d vi t n san hd chua bao hda nudc, diing t h i l t bl chuyen dung I i y san hd tif mau nguyen dang len khdi be m i t v i d i t c i c dSu theo thiJt t u tCf dudi len trSn theo k h o i n g c i c h x i c djnh H o i n t r i hi^n tr^ng n i n san hd v l nguyen trang ban d i u K i l m tra vl$c k i t ndi tfn h i l u giufa m i y tfnh v * cic d i u i p luc b i n g c i c h t h i q u i n i n g r d i d d d c a o l m 2.2.3.Trlnhttrthfnghlim D^t 03 d i u i p life v i o e i c vi tri theo quy djnh cua b i l t h i nghiem {Hinh 3) K i l m tra tlnh tr^ng hoat ddng cOa cic t h i l t bj trUdc bao gdm 03 d i u i p Ig'c, Hinh e, 06 thi dp life dati 01 I OdTHieoAPU/CU^NOOl X i c djnh c h i l u cao t h i q u i r i ^ trudc mdi lan gay t i i T i l n h i n h g i y i p luc sdng nen len mau san hd lam t h i nghiem bang c i c h t h i q u i nltng v i rcri xudng be mat san hd v i thu n h i n duoe tin hi#u trSn m i y tlnh V i t li^u san hd sau mdi lan thi nghiem d i u duoc xdi len de dam b i o khdng cd hi$n t u ^ g bj l i m c h i t sau mdi l i n t h i nghiem, 2.2.4 aa tri dp Itfc sdng nin 2.2A1.Ldnthfnghiim01 DdTHlAPLI/COAUDOOl Hinh f)6 thi gia tri ap luc diu 01,02,03 2.2.4 Ldn thi nghiem 02 o TH| Af> i v c oSu DO 01 mm^mimmmi^ Hinh Bi^uditapiiJcdiudoOl Kinh6.t)dthiaplKcdaudo01 Hlnh9,f>£thiaplifcdaudo02 O TM] AP lyC BAU €>0 O: Hlnhl4.e6thilplircdSudo03 D0THIOOAPLI/CLAN0Q3 Htnh1l,BifudoJpl^cdaudo01,02,03 2.2.4.3 Ldn thi nghiim 03 ' OO THr AP IVC OAU BO 01 H'inh 15 e6th!JplUcdludo01,02,D3 2.2.4.4 L i n thi nghifem 04 ed'mi i^p un: DAU CO O: |W^piitif^miimm^ i^iw- ngi^i^^i iiiii_h>m Hinh 12 OAthiaplircdSudoOl H'mhie.DothilplUcdaudoOl 1137 M AP LUC OAU OO Hinh17,{)6thjaplUcdaudaD2 fid TH| AP uic gXu oo o; Hlnh21 B6thilplircdaudo02 B&TH|APLyCOXuOO03 ^^^^^ff^Wmu Hlnh18,fidth|flpli;cdludoD3 oQiHjtwAPLgiiANoua Hinh 22,fiothidp ldc diu 03 Od THI DO APU/C ^ 0 ''Z.mmftmM/^ llMi^WwiB, Hinh 19.[l6th|aplU(daudo01.O2,03 oflTHlApU/CoXuDOO! —BtiftiOl B1B*« —Ofcii Hlnh23.Dothilplu'cdaudo01,02.03 2.4 Xic dinh g i i tri mo dun Oin hdi ddng cOa n i n san ho Xac d m h g i i t n i p luc trung binh dUoc tinh theo cdng thi^c sau- IpMMMfMtllflMlllfl, ' n Trong d d : n: sd lan thi nghiem J: i p luc sdng n^n tai cac vj M dat dau | : g i i trj i p lUc nhan dUoc cua mdi l i n thi nghiem Oj'' : g i i tri i p lUc trung blnh t^i mdi vj tri d i t d i u Hinh20,MthilplU(dJudo01 381 Binql.Bin Chilu cao red (mm) STT g i i t r i i p lire cua c i c d i u trona ndi trudng San hd Khoing 5j 5, Lin thi 5i c i c h dau nghiem (MPa) (MPa) (MPa) (mm) 1000 300 0.0074 0.0042 0.0041 1000 300 0.0092 0.0045 0.0045 1000 300 0.0093 0.0045 0.0045 1000 300 0.0105 0.0047 00047 1000 300 0.0107 0.0050 0.0050 Thay g i i tn tai b i n g v i o cdng thiJc ta n h i n duoc c i c k i t q u i sau: tt, 0,0074+0,0092 + 0,0093 + 0,0105+0,0107 „ „ „ „ „.„ , ,„ oi = : : =0,0094 [MPa] (2) fc 0.0042+0,0045+0,0045 + 0.0047 + 0,005 _ 0,0041 + 0,0045 + 0,0045 + 0,0047 + 0,0050 0,00458 [MPa] (3) = 0,00456 [MPa] (4) Xic dinh g i i tri van tde trung blnh duoc tinh theo (5) (9) So s i n h m d dun v i t lieu san hd giai doan b i l n d ang d i n hdi V i giai doan bien dang d i o cu the n h u sau: Ej, 41,93.10' E^ 16.01.10* (10) = 2,62 2.5 Kit Iudn Bang phuong p h i p thUe nghiem ta da xac a n h duOc v i n tde lan truyen sdng nen viing b i l n dang d t o va viing b i l n dang dan hdi, tif d d xac djnh duoc md dun v i t lieu san hd chju t i i ddng dang xung viing bien dang d i o , viing bien d?ng d i n hdi K i t q u i nhan duoc cho t h i y md dun v i t lieu san hd chju t i i ddng tai viing bien d^ng d i n hdi Idn hon d i n 2,62 l i n md dun vat lieu san hd viing b i l n dang d i o D i y la thdng sd cd g i i tri quan trgng tinh t o i n ap life tx)m dan t i c dung len k i t c i u cdng trlnh mdi trUdng san hd B i n g B i n q q i tri v i n toe n h i n dUoe tai cic vi trf do) Chieu Khoing cao cich Lin thi STT t,{s) t;{s) rdi dau nghiem (mm) (mm) 0.1989 0.2037 0.1989 0.2041 1000 300 0.1980 0.2004 01999 0.2024 0.1975 0.2012 0.2037 0.2041 0.2004 1000 300 0.2024 0.2012 0.1989 0.1989 1000 600 0.1980 0.1999 0.1975 Hinh 24 Bieu ap iKc Nhdn x€t: Vdi g i i trj i p life trung binh tai c i c cdng thij'c tren ta t h i y g i i tn u " ==of v i y cd the t h i y r i n g i p lUc sdng nen t i i trpng dang xung gay lan t r u y l n d i n d i l m thO' thi mdi trUdng san hd b i l n dang la dan hdi cdng thifc sau: v „ = -^— n Md dun vat lieu san hd giai doan b i l n dang dan hdi difdc tinh nhUsau: E „ , = ( v * } \ p = (l44,446)'.20,1 = 41,93.10* [kN/mT t,(s) 0.2055 0.2054 0.2036 0.2065 0.2031 0.2055 0.2054 0.2036 0.2065 0.2031 At (s) v(m/s) 0.0048 0.0052 0.0024 0.0025 0.0037 0.0018 0.0013 0.0032 0.0041 0.0019 0.0066 0.0065 0056 0066 0.0056 62.5000 57.6923 125.0000 120 0000 81 0811 166.6667 230 7692 93.7500 73.1707 157 8947 90.9091 92.3077 107.1429 90.9091 107.1429 Trong d d : v,^: v | n tde trung blnh [m/s]; V|: v i n tde lan t r u y l n sdng n^n san hd [m/s]; v , j : v^n tde lan t r u y l n sdng nen san hd giai doan bien dang d^o; v , j : v^n tde lan truyen sdng nen san hd giai doan dan hdi; n-sd l i n t h i nghiem; Ea: Md dun v i t l i f u san hd giai doan b i l n dang d i o ; EA: Md d u n vat lieu san hd giai doan b i l n dang d i n hdi; p mit mdi trUdng san hd chifa bao hda nudc TAILIEUTHAMKHAO (1] Hoang XuSn Luang {2004) " M o cio tong k ftfletai KCOg.OS", Cue thdng tin Khoa hoc va C6ngngh^quocgia,HaN£li [2] VufilnhL d , T r u y e n sdng no va t i l no', Tai l i ^ dimg d m cao hoc nganh cdng trlnh Hoc vien Ky thuSt Quan su [3) Vu Oinh LOI {2015), Bio cao tong ket de t i i KC.09,06/11-15, Cue thong tin Khoa hoc va Cong nghe quae gia Ha Noi (Iiy [4) Saleeb AF ConsGtutive models far soils In landslides Ph,D These, PuidueUniversity, 1981 [5J AUTODYH Theoiy Manual, revision 0, Centuiy Dynamks, San Ramon, California, 1997 p = 20,KkN/m') [6! Thay g i i trj v, tai ( b i n g 2) v i o (cdng thilc 5) ta n h i n duoc g i i trj ShamsherP 5oilDynamto,Chapter4.McGraw-Hill:NewYork,1981 [7] Pande GN, ^ e n k i e w i a O C , Soil MeehanicsjTransient and CydK loads Chapter Wiley Chiehester, 1982 v i n tde trung blnh n h u sau v * = '•— = 89,25 [m/s] (6) Md dun v i t i i f u san h d giai doan b i l n dang deo dupe tfnh [S] Fredlund DG, Rahardjo H, Soil Mechanics for Unsaturated Soils, Chapters and 12, Wiley, diidiester, 1993 [9] Cole RH, Underwater Explosions Pnneeton U n i v ^ i t y Press: Princeton, NJ, 1948 nhUsau: Ed=(v5|'2) p = { , f 20,1 = 16,01.10'' [kN/m'] (7) [101 Oien WF, Baladi GY, Soil Plastiaty Theoiy and Implementation BsevierAmstenlam, 1985, [ I I ] Druder DC, Prager W Soil mechanics and plastic analysis or limit design Quarterly of Thay gia tri V| tai ( b i n g 2) v i o (cdng thiic 5) ta nhan duac g i i trj Applied Mathematics 1952; ' - i e [12] AUTODYN Help (2013) ANSYS WORBENCH14 [13IAUT0DYN Iheoiy Manual, Rension 4,1, Century [)ynanks,Ssi Ramorv CaHfixnia, 2001, i2.2oi5EnnE[|oii|39 ... p lire san hd KEX-1MPA D i u KDC-PA l i d i u i p li^c san hd cd k h i nang chdng an mdn mdi trudng nUdc b i l n D i u n i y t h u d n g duocsijrdungde i p life cOa sdng T\& mdi trudng san h d... i p luc sdng nen len mau san hd lam t h i nghiem bang c i c h t h i q u i nltng v i rcri xudng be mat san hd v i thu n h i n duoe tin hi#u trSn m i y tlnh V i t li^u san hd sau mdi lan thi nghiem... djnh duoc md dun v i t lieu san hd chju t i i ddng dang xung viing bien dang d i o , viing bien d?ng d i n hdi K i t q u i nhan duoc cho t h i y md dun v i t lieu san hd chju t i i ddng tai viing