5th Interntionl Conerence on Civil Engineering nd Trnporttion (ICCET 2015) Reerch on Inluence o Retining Wll Drining Cpcity on Stbility o Reervoir Bnk Slope Retining Wll Yiong Zhng1, *Liming Wu1, Zijin Wng2,* nd Guojun Lv3 1 School o Civil Engineering&Architecture,Chongqing Technology nd Buine Intitute,Chongqing 400052,Chin 2 3 School o Civil Engineering&Architecture,Chongqing Univerity o Science&Technology,Chongqing 401331,Chin School o Civil Engineering&Architecture,Chongqing Jiotong Univerity,Chongqing 400074,Chin eyord: Slope retining ll,drining cpcity,stbility;sturtion,diplcement o retining ll. Abtrct. Tking one typicl reervoir bnk lope exmple, do comprtive nlyi on internl orce nd diplcement o lope under dierent drining condition through utilizing inite element otre ABAQUS. Anlyi reult ho tht thrut o lope on retining ll obviouly incree ith the lengthening o rinll time intervl ithout drining. Horizontl diplcement lo preent dierent level o increing long ll height. Finlly it propoe uggetion on tbility meure o retining ll thu providing reerence or the deign, contruction nd mintennce o drining cpcity o reervoir bnk lope retining ll. Introduction Rinll in reervoir re i common ether phenomenon hich i lo one o the importnt incentive o mny engineering ccident. Mot lope become untble nd collpe during or ter rinll [1]. Scholr t home nd brod hve done lot o ork on rinll inducing lope to be untble. They think tht rinll iniltrtion nd groundter level riing led ter content o oil m to incree nd mke coheion, internl riction ngle nd mtrix uction decree thu reducing the hering trength[2]. Thereore lope dringe mooth i n importnt determinnt or it tbility. The et o dringe opening on lope retining ll i one o the importnt meure or drining in lo lope engineering hoe dringe cpcity i n importnt ctor to gurntee lope tbility. During long-term dringe proce, core prticle nd micellneou ill mteril oten led dringe cpcity o dringe opening to decree or even be blocked. It blocking ould reduce the heering trength o rock-oil m nd led hydrulic preure o opening behind retining ll [3]. Continuou increing o hydrulic preure reult in lippge or overturn ilure thu leding lope to be untble. On the bi o it, the uthor doe imultion comprion nlyi on blocking condition o dringe opening on typicl retining ll lope. Anlyi ho tht hydro-ttic preure contntly incree ith the increing o blocking degree o dringe opening hich i n importnt reon or the detruction o retining ll. Engineering Bckground Select n idel nd typicl retining ll lope to ct engineering bckground in hich ll bck i verticl nd urce o rolling erth behind retining ll i horizontl. The top o concrete retining ll i 2m ide. Bottom o it i 4m ide nd it i 10m in height. Three ro o dringe opening re et hoe poition re repectively 1m, 4m nd 7m y rom the bottom o retining ll. Initil groundter level lie t the oot o lope. Eltic modulu o rock-oil m i 10MP nd Poion rtio i 0.3. Coheion C i 15P nd riction ngle ϕ =30 [4]. Figure1 ho the reltionhip beteen turtion nd permebility coeicient o mteril. Rinll time intervl nd reltionhip beteen it turtion nd mtrix uction re lo een in Figure1. 2015. The uthor - Publihed by Atlnti Pre 663
. Digrm o Retining Wll Slope Section b. Curve o Rinll Time Interv c. Digrm o Reltionhip beteen Sturtion nd d. Digrm o Reltionhip beteen Sturtion nd Permebility Coeicient o Slope Rock-oil M Mtrix Suction o Slope Rock-oil M Figure 1. Bic Prmeter o Retining Wll nd Slope Boundry Condition o Rinll Iniltrtion. Proce o rinll iniltrtion i very complex. Mein nd Lron decribe rinll iniltrtion proce nd behvior utilizing three ctor o rinll intenity q,oil iniltrtion llonce cpcity p nd hydrulic conductivity WS [4]. q < k : At thi moment, overlnd runo doe not come into being. Rinll ould totlly iniltrte. Iniltrtion rte o ter remin unchnged. p > q > k p : All rinter iniltrte. decree ith the increing o iniltrtion depth. Hoever, rinll intenity h not reched the oil iniltrtion llonce cpcity. Thereore iniltrtion rte keep high ithout decreing. At thi time, lope urce i lo boundry. q > p : A rinll intenity i higher thn iniltrtion cpcity o oil, prt o rinll ould decline ter it iniltrte nd become overlnd runo cpcity. By thi time, oil on lope urce biclly keep in turtion itution. While rinll reche iniltrtion cpcity, iniltrtion rte ould grdully decline. Reltionhip beteen permebility coeicient nd turtion nd reltionhip beteen turtion nd mtrix uction re hon ollo: = c /[ + b (( u u )) ] (1) 664
In thi ormul, i the permebility coeicient hen oil m i turted. u nd u re tmopheric preure nd hydrulic preure. Contct o tmophere nd lope urce i ner to 0., b nd c re mteril coeicient. c S r = S i + ( S n S i ) /[ + ( b ( u u )) ] (2) In the ormul, Sr i turtion. Si i reidul turtion. Sn i the mximum turtion hoe vlue i 1., b nd c re mteril coeicient. On the bi o the bove-mentioned 2 nd theory, thi model etblihe the time intervl curve een in Figure1 (b) to explin the reltionhip beteen time nd rinll. Thi model lo deine the reltionhip beteen permebility coeicient nd turtion nd reltionhip beteen turtion nd mtrix uction hich re hon in Figure1 (c, d). Engineering Operting Condition In order to nlyze the inluence o dringe cpcity o dierent retining ll dringe opening on tbility o reervoir bnk lope retining ll, thi pper utilize comprion nlyi method to do reerch on dierent operting condition under the me rinll time intervl. Speciic operting condition re hon in Tble1. Tble1. Model Anlyzing Operting Condition Operting Condition 1 2 3 Nme grvity ithout ter Non-dringe retining ll Stree under Dierent Operting Condition beore nd ter Dringe Dringe retining ll Figure2. Grvity Stre Ditribution Figure3. Stre Ditribution under Rinll ithout Dringe Figure4. Stre Ditribution under Rinll ith Dringe Figure5. Velocity Field under Rinll ith Dringe 665
Figure6. Grvity Diplcement Ditribution Figure7. Diplcement Ditribution under Rinll ithout Dringe Figure8. Diplcement Ditribution under Rinll ith Dringe Figure9. Sturtion Ditribution under Rinll ith Dringe Comprion nlyi on Figure2 to Figure5 bove ho tht irtly, tre in the middle prt o retining ll i high under operting condition o grvity nd being ith nd ithout dringe. Secondly, the mximum tre under rinll ithout dringe i higher thn tht under rinll ith dringe hich i lo higher thn tht under grvity. Thirdly, tre under retining ll be i higher thn tht on it let nd right ide. Stre on it both ide i loer. Slope Stre nd Diplcement ith nd ithout Rinll Comprion nlyi on Figure6 to Figure8 bove ho tht irtly, diplcement on top o retining ll i higher under operting condition o grvity nd being ith nd ithout dringe. From top to bottom o retining ll, diplcement grdully decree. Secondly, the mximum diplcement o top point o retining ll under rinll ithout dringe i higher thn tht under rinll ith dringe hich i lo higher thn tht under grvity. Thirdly, inluencing rnge o rock-oil m deormtion behind retining ll grdully reduce rom the top to the bottom o it. Curve o Stre Chnging ith Rinll Time Intervl under Dringe nd Non-dringe Operting Condition It i een rom the igure 10 tht irtly, Stree under dringe nd non-dringe condition ty the me during the irt 25 hour o rinll becue oil m keep unturted. Secondly, their 666
dierence become greter nd greter ter 25 hour o rinll becue oil m become turted in hich it i dringe opening behind the ll to tke the reidul rinter y. Figure10. Curve o Retining Wll Stre Chnging ith Rinll Time Intervl under Dierent Dringe Condition (p/h) Concluion nd Suggetion Tking typicl reervoir bnk lope exmple, thi pper utilize inite element otre ABAQUS to do comprtive nlyi on internl orce nd diplcement o lope under dierent dringe condition. Through nlyi, e cquire the olloing concluion nd uggetion. Stre in the middle prt o retining ll i high under operting condition o grvity nd being ith nd ithout dringe. Diplcement on top o retining ll i higher under operting condition o grvity nd being ith nd ithout dringe, hich grdully reduce rom the top to the bottom o it. The mximum tre nd diplcement o retining ll under rinll ithout dringe re higher thn thoe under rinll ith dringe hich re lo higher thn thoe under grvity. Stre under retining ll be i higher thn tht on it let nd right ide. Stre on it both ide i loer. Stree o retining ll under dringe nd non-dringe condition ty the me during the irt 25 hour o rinll becue oil m keep unturted. Dierence o Stree under dringe nd non-dringe condition become greter nd greter ter 25 hour o rinll becue oil m become turted in hich it i dringe opening behind the ll to tke the reidul rinter y. It i uggeted tht inluence o blocking degree o dierent dringe opening, lope hpe nd dierent phyicl prmeter o rock-oil m hould be tken into ccount in the reerch on inluence o dringe condition on tbility o retining ll o to led it tructure to be more relible. Necery conirmtory experiment reerch could be done under expenditure nd experiment condition being lloed. Reerence [1] Yin Jun. Inluence o rinll on oil lope tbility [D]. Nnjing: Nnjing Univerity o Technology mter' degree thei,2012. [2] Tng Yi Qun, he Tinyu, Zhng Xiohui et. Sher trength chrcteritic long ith the chnge o ter content reltionhip tudy [J]. Journl o engineering geology, 2009,17 (2): 249-252. [3] Zhng Hnhen, Ji Xinzhong, He Chunki. The intbility o grvity retining ll nd the trengthening o [J]. exchnge pltorm, 2007.72-74. [4] Zhng Jinei, Fei ng. ABAQUS ppliction in geotechnicl engineering [M]. Beijing: Chin Wter Conervncy nd Hydropoer Pre, 2010. 667