《基坑开挖支护》PPT课件

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1、 Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 1 Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 2 Content- Reproducible numerical soil properties- Ball parameters

2、for specific soils- Simulation of the excavation process in front of sheet pile wall constructions - unsupported - single supported - single supported with a plastic hinge - Conclusions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering

3、 3 Reproducibility of soil parameters1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions (pore content and inner friction angle of granular soils)W / H / D = 4.70 / 3.00 / 0.60 m W = H = D = 2.14 m soil balls d = 0.20 m Federal Waterways Engineering and Research Insti

4、tuteUniversity of Wuppertal Institute for Geotechnical Engineering 4 Reproducible pore contentslender container mean pore content = 0.4011 variation coefficient = 0.019 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions 0 12 3 4 number o f occurren ces 1pore content

5、n - 0.390 0.400 0.410 square container mean pore content = 0.4016 variation coefficient = 0.00501234number of occurrences 1pore content n - 0.390 0.400 0.410 Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 5 Reproducible inner fricti

6、on angle at restslender container mean inner friction angle = 26.3 / 27.1variation coefficient = 0.148 / 0.230k0 = 2 E0 / ( h2 t) k0 = 1 sin 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions 1520 2530 3540 0,385 0,390 0,395 0,400 0,405 0,410 0,415pore content n -in

7、ner friction angle left wall right wall square container mean inner friction angle = 32.3 / 32.0variation coefficient = 0.053 / 0.0591520253035400,398 0,400 0,402 0,404 0,406pore content n -inner friction angle left wall right wall Federal Waterways Engineering and Research InstituteUniversity of Wu

8、ppertal Institute for Geotechnical Engineering 6 Reproducibilitypore content 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions inner friction angle 00,05 0,10,15 0,20,25 0 5 10 15 20balls / wall lengthva riation coe fficient - 00,004 0,0080,012 0,0160,02 0 5 10 15 2

9、0balls / wall lengthva riation coe fficient - For low stochastic effects on the results: 15 balls in a row mathematically on one confining wall. Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 7 Ball parameters at 1g levelgranular so

10、ils: = 30 - 40 ; n = 0.400ball diameters d = 2 mm - 20 cmcubic containers wall lengths 15 x d - 25 x dslender containers wall depths 15 x d heights = 30; n = 0.400pouring and rest ks_pour = 715.18 br 2.0259sf_rest = 0.30 0.35sf_pour = 0.2 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simu

11、lations 4. Conclusions 00,2 0,40,6 0,81 0,0001 0,001 0,01 0,1 1ball radius msurfa ce friction at rest - 1,0E-041,0E-02 1,0E+001,0E+02 1,0E+041,0E+06 ks, kn kN/ m sf_rest ks_pour kn n ks_act = 1E5 kN/msf_act_move = 0.40 0.45 active earth pressure 00,4 0,81,2 1,62 0,0001 0,001 0,01 0,1 1ball radius ms

12、urf ace friction active - 1,0E+001,0E+02 1,0E+041,0E+06 ks kN/m sf_active move sf_active triax ks_active Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 9 Cubic container15 x d; = 30 - 40; n = 0.400 sf_rest - sf_act_move - ks_act kN/

13、m30 0.30 0.35 0.40 0.45 8E4 5E535 0.60 0.70 0.90 1.10 8E4 2E540 4.5 6.0 3.5 4.5 8E3 2E5 sf_rest = 0.00009 e 0.2659 sf_act_move = 0.0006 e 0.2185 ks_act = 1E5 kN/m 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions Federal Waterways Engineering and Research InstituteU

14、niversity of Wuppertal Institute for Geotechnical Engineering 10 ball parametersn = 0.400 = 30 = 35 = 40 containersize container-shape15 x d cubic- - 20 x d cubic- - 25 x d cubic15 x d / 25 x d slender- - 15 x d / 30 x d slender 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4.

15、 Conclusions Applicability of determined formulas demonstrated at systems deviating from examined ones ! Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 11 Sheet pile wall simulation- Slender container W / H / D = 16.95 / 10.78 / 0.7

16、0 m Soil properties : = 29, n = 0.392 (mean value)- 20,000 soil balls - diameter 20 cm - Sheet pile wall Larssen 601: H / D = 7.70 / 0.60 m Wall balls diameter = 10 cm - 3 Pentium IV (2.4 - 2.7 GHz) computers in parallel 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclus

17、ions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 12 Sheet pile wall simulation - unsupported excavation depth 1.0 m2.0 m3.0 m3.6 m4.0 m1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions Federal Wa

18、terways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 13 Sheet pile wall simulation - unsupported1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -175-125-75-252575125175 eh kN/m wal

19、l h eight m 2,0 m passive 2,0 m active4,0 m passive 4,0 m activeepgh eagh e0 epgh eo eagh Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 14 Unsupported sheet pile wall regularly packed tetragonal spatial centered y xy z excavation 4

20、.0 m51. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 15 Unsupported sheet pile wall regularly packed1. Reproducibility 2. Ball parameters 3. Sheet pi

21、le wall simulations 4. Conclusions 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -175-7525125225325 eh kN/m wall h eight m 4,0 m pas reg 4,0 m act reg4,0 m pas pour 4,0 m act pourepgh eagh e0 eo eagh epgh Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engine

22、eringSheet pile wall simulation - supported 16 excavation depth 3.0 m4.0 m5.0 m6.0 m1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 17 Sheet pile wal

23、l simulation - supported1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -175-125-75-252575125175 eh kN/m wall h eight m 6.0 m passive 6.0 m active3.0 m passive 3.0 m activeepgh epgh e0 eagh epgh eo eagh epgh Federal Waterways Engine

24、ering and Research InstituteUniversity of Wuppertal Institute for Geotechnical EngineeringSheet pile wall simulation - supported & plastic hinge 1802040 6080100120 140160 0,00 0,05 0,10 0,15 0,20Rotation Phi rad M kNm/m excavation depth 4.0 m5.0 m6.0 m 1. Reproducibility 2. Ball parameters 3. Sheet

25、pile wall simulations 4. Conclusions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical EngineeringSheet pile wall simulation - supported / elastic - plastic1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions 0,01,0

26、2,03,0 4,05,0 6,07,0 8,0 -0,12 -0,10 -0,08 -0,06 -0,04 -0,02 0,00w m wall heig ht m plastic elastic 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -180 -150 -120 -90 -60 -30 0 30My kNm/m wall heig ht m elastic plastic 19 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -120 -90 -60 -30 0 30 60 90Qx kN/m wall heig ht m elastic plas

27、tic Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 0,01,0 2,03,0 4,05,0 6,07,0 8,0 -125-75-252575125 eh kN/m wall h eight m 6.0 m plastic passive 6.0 m plastic active6.0 m elastic passive 6.0 m elastic activeepgh epgh e0 eagh epgh e

28、o eagh epgh 20 Sheet pile wall simulation - supported / elastic - plastic1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions Federal Waterways Engineering and Research InstituteUniversity of Wuppertal Institute for Geotechnical Engineering 21 ConclusionsBall parameter

29、s for different soils and container geometries determined Simulation 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 pressure studied for first time without artificial weakening of wall or hydrostatic water pressure - same excavation depth can be reached with a weaker profile when taking the moment-rotation-behavior into account15 balls per wall length 1. Reproducibility 2. Ball parameters 3. Sheet pile wall simulations 4. Conclusions