基坑開挖支護

1、Content 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 supported with a plastic hinge Con elusions2. Bal4. ConckReproducibility of soil parameters(pore conten

2、t and inner friction angle of granular soils)W = H = D = 2.14mW H / D = 4.70 / 3.00! 0.60 msoil balls d = 0.20 m2. BalReproducible pore contentslender containerpore content n -square contai nerpore content n -mean pore content = 0.4011mean pore 8nlent = 0.4016variation coefficient = 0.019variation c

3、oefficient = 0.0052. BalReproducible inn er friction angle at restslender container40ft vlcjfwl038503900.3950X)0/4050/1100.415pore content n -)|leM wJI rkjh! 1square containerpore content n 廠Z-lellwallnqhlwall |mean inner friction angle = 26.3J / 27.1variation coefficient = 0.148 / 0.230mean inner f

4、riction angle = 32.3/ 32.0variation coefficient = 0.053 / 0.0590.02 -0.016 2. Balpore 8nlentReproducibility0.25For low stochastic effects on the results:15 balls in a row mathematically on one confining wall.0.012 101520balls wall length0.0510balls: wall length1320 Rep2. Ball parameters4. ConckBall

5、parameters at 1g levelgranular soils: 9 = 30d 40 ; n = 0.400ball diameters d = 2 mm - 20 cmcubic containers wall lengths I5xd 25 x dslender containers wall depths 15 x dheights & lengths of 25 x d - 30 x dRepfod-2. Ball parameters3. SI4. ConCubic container一一才一0.80.60.40.200.0001i.oe*o41.0642 Ji.

6、oG<oo £1.06x121.0E-04pouring and rest15 x d; © = 30" ； n =0.400active earth pressurei.oGog20.0001 0,0010.010.1bil radus tellI move zl dclhw inaxH 2r3Isi res! Ks n0.001 0.01ball radius msf_pour = 0.2ks_pour = 715.18 br 2 0259ks act = 1E5 kN/msf_act_move = 0.40 - 0.45surest = 0.30 -

7、0.351.0E*061.0E*041.0E*02i.oE*ooks aclhvlReprodability2. Ball parameters3. Sheet pile wall simulations4. ConCubic container15xd;p = 30J 40 ； n =0.4009 11sf.rest -st act move Hks_act kN/m300.30 - 0.350.40 - 0.458E4 - 5E5350.60 - 0.700.90-1.108E4 - 2E5404.5-6.03.5-4.58E3 - 2E5sf_rest = 0.00009 e 0 265

8、9 osf_act_move = 0.0006 e 021850 ks act = 1E5 kN/mReprod2. Ball parametersball parametersn = o.4oo9 = 30*9 = 35°*40。von tainersizecontainershape/15xdcubicApplicability of determi ned formulas dem on strated atubicsystems deviating from examined ones !ubicV/15xd/25xdslender-/-15xd/30xdslender3.

9、Sheet pile wall simulationsSheet pile wall simulation-Slender container W/H/D = 16.95 /10.78! 0.70 m 20.000 soil balls -> diameter 20 cmSoil properties ：p = 29c , n = 0.392 mean value) Sheet pile wall Larssen 601： H / D = 7.70! 0.60 mWall balls diameter = 10 cm-3 Pentium IV (2.4 2.7 GHz) computer

10、s in parallel Rep3. Sheet pile wall simulationsConclSheet pile wall simulation unsupportedexcavation depth1.0 m2.0 m3.0 m3.6 m4.0 mReprodi2. Bal3. Sheet pile wall simulations4.CortSheet pile wall simulation unsupportedeh kN moS 2.0 m passive- 2.0 m active4.0 m passive4.0 m activeReprod:ibilily2. Bal

11、l parametersUn supported sheet pile wall -tetragonal spatial centered3. Sheet pile wall simulations-regularly packedReprodi2. Bal3. Sheet pile wall simulationsUn supported sheet pile wall 一 regularly packed325225eh kN/mB12525-75-175E】Z6OJZ一一-4.0 mact reg-4.0 mact pour4.0 m pas reg4.0 m pas pour Rep3

12、. Sheet pile wall simulationsConclSheet pile wall simulation supportedexcavation depth3.0 m4.0 m5.0 m6.0 mReprodi2. Bal3. Sheet pile wall simulationsSheet pile wall simulation supportedeh kN 'mffl1751257525-25-75125175ill-OyG-*''1警、廠J二亍_Q A _ _1 1 . _ 1epgnv eagneo |6.0 m passive6.0 m ac

13、tive3.0 m Dassive3.0 m activeReprod2. Bal3. Sheet pile wall simulations4.C<xiSheet pile wall simulation supported & plastic hingeCMexcavation depth4.0 m5.0 m6.0 m煉5Reprod2. Bal3. Sheet pile wall simulationsSheet pile wall simulation - supported / elastic plasticQx kN/mE26PII N 星kNm'ml

14、1;«OtO-jo A0-2R A*0金A7 A19.Reproduc2. Ba!3. Sheet pile wall simulationsSheet pile wall simulation - supported / elastic plastic125-125eh kNrmi97525-25756.0 m plastic passive 6.0 m elastic passive6.0 m plastic active6.0 m elastic activefl1ePgh-二二一-Q A-epgneagneoE】E6OV 一一 bmReprodability2. Ball p

15、arametersFederal Waterways Engmeering and Research Institute3. Sheet pile wall4. ConclusionsCon elusions15 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 s