Hydro-Mechanical Properties of an Unsaturated Frictional Material

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CHAPTER 10. BEARING CAPACITY OF A STRIP FOOTING ON UNSATURATED 198 HOSTUN SAND Figure 10.2: Mechanism of failure below smooth footing (Gussmann 1986, reprint with permission from P. Gussmann) 10.2 Bearing Capacity Equipment Bearing capacity of a surface model footing was measured in a box specially designed for this study. In Fig. 10.3 the bearing capacity equipment is shown. For determination of bearing capacity of model footing a box 1000 mm in length, 500 mm in height and 500 mm in width was designed. The box consists of an outer frame made of wood and an inner tank. The outer frame serves as a stiffener to prevent lateral bending or deformations that may occur when loading the model footing in the tank. The tank was constructed using 9 mm thick plates made of plexiglas. The tank has 4 openings (2 at each side), that are used for application of water to the box. During the testing procedure the openings are connected to Burette Water supply Loading piston Model strip footing Loading frame Infield Tensiometer Figure 10.3: Bearing capacity equipment Burette Water supply
10.2. BEARING CAPACITY EQUIPMENT 199 45 mm 477 mm Figure 10.4: Model strip footing 79 mm Model strip footing 2 burettes (1 at each side), that are used to apply suction to the specimen by hanging water column technique. Bearing capacity tests are performed using a model footing 477 mm in length, 79 mm in width and 45 mm in height, that is a strip footing. The strip footing is made of steel and is shown in Fig. 10.4. The friction angle was determined for plane strain loading conditions using a double wall cell (Schanz & Alabdullah 2007, Alabdullah & Schanz 2009). The measured friction angle was equal to φ = 46.9 ◦ . The calculations using Rankine’s analysis shows that the failure zones extends to a length approximately equal to 500 mm and the maximum depth to 100 mm. The box was designed such that the box dimensions are greater than the calculated values of the failure zone (i.e. 1000 mm in length, 500 mm in width and 500 mm in height). The failure mechanism is given in Fig. 10.5. Additionally the box may be equipped also with tensiometer sensors in several depth for measuring pore-water pressure. The bearing capacity equipment is placed in a loading frame. Using the loading frame the bearing capacity was measured by loading the surface footing in the saturated specimens as well as unsaturated specimens. During the test the loading system is measuring settlements and the applied load. The accuracy of settlement readings is 0.001 mm and the 10 cm α β 25 cm α = 45°+ φ/2 β = 45° - φ/2 Figure 10.5: Failure below strip footing following Rankine
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Hydro-Mechanical Properties of Part
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Acknowledgement The present dissert
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3.2 Steps of Model Building . . . .
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11 Summary and Outlook 205 11.1 Gen
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2.16 Influence of Brooks and Corey
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6.2 Experimental results of soil-wa
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7.17 Unsaturated hydraulic conducti
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B.6 Experimental results and best f
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8.3 Constitutive parameters for the
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E ref ur Oedometer reference stiffn
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ρ Density (g/cm 3 ) ρd ρs Dry de
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2 CHAPTER 1. INTRODUCTION Figure 1.
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4 CHAPTER 1. INTRODUCTION - Model b
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6 CHAPTER 1. INTRODUCTION
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8 CHAPTER 2. STATE OF THE ART condu
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10 CHAPTER 2. STATE OF THE ART soil
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14 CHAPTER 2. STATE OF THE ART Figu
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18 CHAPTER 2. STATE OF THE ART - Re
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20 CHAPTER 2. STATE OF THE ART Volu
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22 CHAPTER 2. STATE OF THE ART Drai
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24 CHAPTER 2. STATE OF THE ART wher
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26 CHAPTER 2. STATE OF THE ART drai
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28 CHAPTER 2. STATE OF THE ART Tabl
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30 CHAPTER 2. STATE OF THE ART Tabl
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32 CHAPTER 2. STATE OF THE ART by W
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34 CHAPTER 2. STATE OF THE ART proc
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38 CHAPTER 2. STATE OF THE ART auth
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40 CHAPTER 2. STATE OF THE ART 2.5.
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46 CHAPTER 2. STATE OF THE ART fitt
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48 CHAPTER 2. STATE OF THE ART Satu
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50 CHAPTER 2. STATE OF THE ART when
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52 CHAPTER 2. STATE OF THE ART Degr
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54 CHAPTER 2. STATE OF THE ART 1. T
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56 CHAPTER 2. STATE OF THE ART 0.2
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58 CHAPTER 2. STATE OF THE ART meth
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60 CHAPTER 2. STATE OF THE ART When
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62 CHAPTER 2. STATE OF THE ART Vert
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64 CHAPTER 2. STATE OF THE ART a) S
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66 CHAPTER 2. STATE OF THE ART - Ja
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68 CHAPTER 2. STATE OF THE ART
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70 CHAPTER 3. INTRODUCTION TO PROCE
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76 CHAPTER 4. EXPERIMENTAL SETUPS s
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78 CHAPTER 4. EXPERIMENTAL SETUPS 1
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80 CHAPTER 4. EXPERIMENTAL SETUPS D
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84 CHAPTER 4. EXPERIMENTAL SETUPS b
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94 CHAPTER 4. EXPERIMENTAL SETUPS T
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96 CHAPTER 5. MATERIAL USED AND EXP
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116 CHAPTER 6. EXPERIMENTAL RESULTS
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136 CHAPTER 7. ANALYSIS AND INTERPR
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138 Observed values (-) Observed va
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Page 268 and 269: 242 Observed Values Number of obser
Page 270 and 271: 244 BIBLIOGRAPHY Aubertin, M., Mbon
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248 BIBLIOGRAPHY Davis, J. L. & Ann
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250 BIBLIOGRAPHY Ferré, P. A. & To
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252 BIBLIOGRAPHY Grozic, J. L. H.,
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254 BIBLIOGRAPHY Janbu, N. (1969),
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256 BIBLIOGRAPHY Lawton, E. C., Fra
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258 BIBLIOGRAPHY Mualem, Y. (1977),
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260 BIBLIOGRAPHY Phene, C. J., Hoff
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262 BIBLIOGRAPHY Rojas, J. C., Sali
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264 BIBLIOGRAPHY Stoimenova, E., Da
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266 BIBLIOGRAPHY Vanapalli, S. K. &
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268 BIBLIOGRAPHY Unsaturated Geotec
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Schriftenreihe des Lehrstuhls für
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Herausgeber: Th. Triantafyllidis 32
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Hydro-Mechanical Properties of an Unsaturated Frictional Material

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