PORT WORKS DESIGN MANUAL PART 3 Guide To - The University ...

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108Table D2.6m0123M0.5711.5712.5713.571sumui0.50.1710.0490.0040.0000.2240.7761.50.4960.1060.0040.0000.6060.3942 . ( Mz]sin exp( jW 2 r v ) withz(M (H dr )2.50.7730.076-0.0040.0000.8440.1563.50.974-0.017-0.0040.0000.9530.0474.51.079-0.0950.0040.0000.9880.0125.51.079-0.0950.0040.0000.9880.0126.50.974-0.017-0.004Lo.ooo0.9530.047'rrA, m J7.50.7730.076-0.0040.0000.8440.1568.50.4960.1060.0040.0000.6060.3949.50.1710.0490.0040.0000.2240.776Note:Strictly speaking, Equation B2a is not valid as the excess pore water pressure is not constantthroughout the marine deposit layer. The excess pore water pressure, u e? at depth z aftertime t is given by:nnz— M. sin——c/z sin2d I 2dexp(— 4d2Alternatively, the method developed by M. Carter for Macau International Airport can beadopted to determine the time curve for the degree of consolidation. For details, see pp 35-40 in Transactions, Volume 3, Number 1, the Hong Kong Institution of Engineers.Consolidation due to horizontal drainage aloneFrom Equation B3,£ = 1.05 yearD = 1.05xl.5 = 1.58mT = ° ht = L5xL05" D 2 1.58 2 = 0.63,, 2(5 + 100) „„d'= -i - ^ = 66.8 mmnd'nn 2 Inn- 3«2 -l-l= 2.42
109= 0.88-8x0.632.42Consolidation under combined vertical and horizontal drainageFrom Equation B4, U f =U h +U v - U h U v , the degree of consolidation at each sub-layer iscalculated as below:Table D2.7Layer12345678910z(mPD)-8.5-9.5-10.5-11.5-12.5-13.5-14.5-15.5-16.5-17.5ui0.9730.9270.8990.8860.8810.8810.8860.8990.9270.973(2d) Primary consolidation settlement due to reclamation fill and surcharge preloading (withvertical drain) at the time just immediately after surcharge removal (end of 22 nd month)The first estimate of settlement occurs at end of 22 nd month is taken to be 3.0 in (it should beadjusted based on subsequent calculated settlement). The effective stress increment due tothe loading of reclamation fill at the centre of the first sub-layer is given by:Depth of fill below MSL = +1.3 mPD - (-8.0 mPD) + 3.0 m = 12.3 mDepth of fill above MSL = 5.0 m + 4.5 mPD -1.3 mPD - 3.0 m = 5.2 mThe effective stress increment if all pore pressure is dissipated at end of 22 nd month:Acr v = 12.3(19.0 -10.1) + 5.2(19.0) = 208.3 kN/m 2
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PORT WORKS DESIGN MANUALPART 3Guide
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FOREWORDThe Port Works Design Manua
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CONTENTSTITLE PAGE - !FOREWORD 3CON
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PageNo.5.3.3 Verification of Settle
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101.2 Definition, Symbols and Refer
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12the investigations may need to co
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14consequences of adopting a partic
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16(3) Installation of vertical drai
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18The remaining layer of marine or
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20• The rate of supply of public
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22the shortage of public filling ca
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24Considerations when planning the
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262.10 Environmental ImpactsAll rec
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293.3.1 GeneralThe reclamation sequ
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31requires checking of the equilibr
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33(2) Detailed Stability AnalysisTh
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3.4 WorksIf, despite all the precau
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374.4.1 GeneralThis chapter discuss
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3943.2 due toThe ultimate primary c
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41where S pt(residml) = Residual se
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Design of surcharge preloading gene
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45H = Fill thickness.a = Logarithmi
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47The calculation of residual settl
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50For monitoring of pore pressure d
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525.3.2 of FillThis section discuss
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54the availability of frequent moni
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56reduce settlement problems. Howev
Page 61 and 62: 59REFERENCESAsaoka, A (1978). Obser
Page 63: 61FIGURES
Page 67 and 68: 65(1) Geotextile-\I,- i i i i i , ,
Page 69 and 70: 67Figure 5 - Method of Calculation
Page 71 and 72: 69timet + 120Piezometer installed a
Page 73 and 74: 71Slope >1Required pause in fill pl
Page 75: 73APPENDIX APREFABRICATED BAND DRAI
Page 78 and 79: 76List of ASTMD4491-92: Standard Te
Page 81: 79CONTENTSTITLE PAGE 77CONTENTS 79B
Page 84 and 85: 82t = Time from load application.c
Page 86 and 87: 84Hansbo, S. (1981).Consolidation o
Page 89 and 90: 87CONTENTSTITLE PAGE 85CONTENTS 87C
Page 91 and 92: 89C OF BY ASAOKA'S METHODC.IGeneral
Page 93: 91OFFigureNo.PageNo.C1 Asaoka's Gra
Page 96 and 97: 94SiFinal settlementPlacement of. a
Page 99: 97CONTENTSTITLE PAGE 95CONTENTS 97D
Page 102 and 103: 1000.3(8.9)(3 2 )(1. 2) - 2.8836L e
Page 104 and 105: 102Vertical drains dataTypeSpacingP
Page 106 and 107: 104The final primary consolidation
Page 108 and 109: 106The initial effective stress at
Page 112 and 113: 110Effective stress increment at en
Page 114 and 115: 112(3) Settlement due to secondary
Page 116 and 117: 114The value ofF(n) in Example D.2
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Page 120 and 121: 118CD~5COCOCDCLCD20 -14.9Required p
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Page 124 and 125: 122state value.Mud wave. Excessive
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Page 128 and 129: 126dd'D ree 0e maxe minFHI pK aLeng
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Page 132: X1S1SD112HK 627.5 P83Port works des
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