基坑开挖支护

1、1一壮h w*二再TTsag,d rfrexcavation process in front of le wall constructions制 Mi I Bi tl ft s ifContent? Reproducible numerical soil properties-Ball parameters for specific soils? Simulation of the excavation process in front of sheet pile wall constructions? unsupported? single supported? single suppor

2、ted with a plastic hingeCon elusionsReproducibility of soil parameters(pore content and inner friction angle of granular soils)W = H = D = 2.14mH / D = 4.70 / 3.00! 0.60 msoil balls d = 0.20 mReproducible pore contentslender containerpore content n -square contai nerpore content n -mean pore content

3、 = 0.4011 mean pore 8nlent = 0.4016variation coefficient = 0.019 variation coefficient = 0.005Reproducible inn er fricti on an gle at restslender containersquare container40pore content n -)| leM wJI rkjh! 1pore content n 厂 Z-? lellwall nahlwall |mean inner friction angle = 32.3/ 32.0mean inner fric

4、tion angle = 26.3 J / 27.1variation coefficient = 0.148 / 0.230 variation coefficient = 0.053 / 0.059pore 8nlentReproducibilityinner Incton angle0.250.02 -0.012 ?For low stochastic effects on the results:0 DOft -15 balls in a row mathematically on one confining wall.0.05a110152010130.016 ?balls ? wa

5、ll le ngthballs: wall le ngthBall parameters at 1g levelgranular soils: 9 = 30 d ? 40' n = 0.400 ball diameters d = 2 mm - 20 cm cubic containers wall lengths I5xd ? 25 x d slender containers wall depths 15 x dheights & lengths of 25 x d - 30 x dRepfod2. Ball parameters3. SI4. ConCubic conta

6、iner15 x d; ? = 30"0.400pouring and resti.o gaogball radius m r ,iisi res! 口 Ks n“H2r3active earth pressure0.0001 0,0010.010.1bil radus tellmove zl dclhw inaxks aclhvl1.0E*061.0E*041.0E*02i.oE*oosf_pour = 0.2ks_pour = 715.18 br2 0259surest = 0.30 - 0.35P0UTnks act = 1E5 kN/msf_act_move = 0.40 -

7、 0.45Cubic container15xd;p = 30 J? 40 ； n =0.4009 11sf.rest -st act move Hks_act kN/m300.30 - 0.350.40 - 0.458E4 - 5E5350.60 - 0.708E4 - 2E5408E3-2E5sf_rest = 0.00009 e 0 2659 osf_act_move = 0.0006 e021850ks act = 1E5 kN/mReprod2. Ball parametersball parametersn 二 o.4oo9 = 30*9 = 35 °*40。von ta

8、inersizecontainershape/15xdcubicubicApplicability of determi ned formulas dem on strated atsystems deviati ng from exam ined ones !ubic15xd/25xdslender-/-15xd/30xdslender3. Sheet pile wall simulationsSheet pile wall simulati on-Slender container W/H/D = 16.95 /10.78! 0.70 m20.000 soil balls -> di

9、ameter 20 cmSoil properties : p = 29 c , n = 0.392 mean value)H / D = 7.70! 0.60 mSheet pile wall Larssen 601Wall balls diameter = 10 cmRepConcl3. Sheet pile wall simulationsSheet pile wall simulation? unsupportedexcavation depth1.0 m2.0 m3.0 m3.6 m4.0 m75125Sheet pile wall simulatio n7525un support

10、ed7552*_175Uliepgh?2.0 m passive?-? 2.0 m active4.0 m passive4.0 m activeReprod:ibilily2. Ball parametersUn supported sheet pile wall -excavation 4.5 mtetragonal spatial centered3. Sheet pile wall simulations-regularly packedehkN/mB狸55325Un supported sheet pile wall3. Sheet pile wall simulations-175

11、regularly packed4.0 m pas reg4.0 m pas pourSheet pile wall simulation? supportedexcavation depth3.0 m4.0 m5.0 m6.0 meh kN 'mffl-25-751751257525175Sheet pile wall simulation? supportedill-OyG-* ''1警?警、？厂1 !-丁 J125Q A _ _1 11 epg nv eag neo |6.0 m passive6.0 m active3.0 m Dassive3.0 m acti

12、veReprod2. Bal3. Sheet pile wall simulationsSheet pile wall simulation? supported & plastic hinge4.C<xiexcavation depth4.0 m5.0 m6.0 mReprod2. Bal3. Sheet pile wall simulationsplasticSheet pile wall simulatio n - supported / elasticQx kN/m kNm'ml*6030030i?OT O-Jo A .A A 2R A*0R A金A7 A19.R

13、eproduc2. Ba!Sheet pile wall simulatio n -3. Sheet pile wall simulationssupported / elastic? plastic1125eh kN rmi957525-25? 756.0 m plastic passive6.0 m elastic passive6.0 m plastic active6.0 m elastic activeePgh 二二二一-Q A-epgneagneo1flV E 】一 E6Oability2. Ball parametersFederal Waterways Engmeering a

14、ndResearch InstitutetunReprod3. Sheet pile wall4. ConclusionsCon elusi ons15 balls per wall lengthBall parameters for differenl soils and container geometries determinedSimulation of excavation processes in front of sheet pile wall constructions, with an insight into the soilInfluence of plastic hinge in sheet pile wall on earth p