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首页香港岩土工程:最新版基础设计与施工指南
"《基础设计与施工》是香港特别行政区岩土工程办公室于1996年发布的一份参考文献,其修订版于2006年出版。该书旨在总结和提炼关于基础设计和施工的核心原则及实践经验,特别针对香港地区的地质条件。它强调了在基础工程中采用理性设计方法的重要性,通过大量的仪器堆载试验,工程师们对桩体行为有了更深入的理解,从而能够设计出经济高效的地基解决方案。 1996年的原始文档(GEO出版物编号1/96)主要关注桩的构造,而新版本扩展了范围,不仅涵盖了桩基础设计的关键要素,还响应了业界对于浅基础设计的关注。书中汇集了香港地区进行的仪器堆载试验数据,鼓励从业者继续提供本地试验的原始数据,以丰富堆数据库,提升工程设计的科学性和准确性。 本书由一个由政府相关部门、香港工程师学会和香港建筑协会代表组成的专家小组指导编写,广泛征求了当地专业团体、咨询工程师、承包商、学者以及国际知名专家的意见,这些反馈在最终版本中得到了体现。此出版物旨在帮助基础工程专业人士利用现代技术和知识,更好地应对复杂多变的香港地质条件。 通过阅读这本书,读者可以了解到基础设计中的关键步骤,如深孔桩施工技术、Osterberg加载单元在桩载荷测试中的应用、不同地质环境下(如大理石地基或斜坡上的大直径桩)的基础建设案例,以及如何根据香港独特的地质特性进行合理设计。此外,它还提供了实用的设计指南和最佳实践,以确保基础工程项目的安全和经济性。" 《基础设计与施工》是一本重要的参考资料,它将理论知识与实际工程案例相结合,对于从事香港地区基础工程的设计师、施工人员和技术人员来说,是一份不可或缺的工具书。
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16
Table Pa
g
e
No.
No.
8.3 Defects in Displacement Piles Caused by Ground Heave and Possible 210
Mitigation Measures
8.4 Problems with Displacement Piles Caused by Lateral Ground 210
Movement and Possible Mitigation Measures
8.5 Problems with Driven Cast-in-place Piles Caused by Groundwater and 211
Possible Mitigation Measures
8.6 Limits on Driving Stress 211
8.7 Limits on Properties of Bentonite Slurry 230
8.8 Causes and Mitigation of Possible Defects in Replacement Piles 232
8.9 Interpretation of Vibration Tests on Piles 259
8.10 Classification of Pile Damage by Dynamic Loading Test 264
9.1 Loading Procedures and Acceptance Criteria for Pile Loading Tests in 276
Hong Kong
9.2 Range of CASE Damping Values for Different Types of Soil 291
A1 Interpreted Shaft Resistance in Loading Tests on Instrumented 343
Replacement Piles in Hong Kong
A2 Interpreted Shaft Resistance in Loading Tests on Instrumented 347
Displacement Piles in Hong Kong
A3 Interpreted Shaft Resistance in Loading Tests on Instrumented 350
Replacement Piles with Shaft-grouting in Hong Kong
A4 Interpreted Shaft Resistance and End-bearing Resistance in Loading 351
Tests on Instrumented Replacement Piles Embedded in Rock in Hong
Kong
17
LIST OF FIGURES
Figure Pa
g
e
No. No.
2.1 Principal Rock and Soil Types in Hong Kong 28
2.2 Geological Map of Hong Kong 31
2.3 Representation of a Corestone-bearing Rock Mass 32
3.1 Generalised Loading and Geometric Parameters for a Spread Shallow 44
Foundation
3.2 Linear Interpolation Procedures for Determining Ultimate Bearing 47
Capacity of a Spread Shallow Foundation near the Crest of a Slope
5.1 Suggested Procedures for the Choice of Foundation Type for a Site 70
6.1 Wave Equation Analysis 92
6.2
Relationship between N
q
and φ'
94
6.3
Relationship between β and φ' for Bored Piles in Granular Soils
96
6.4
Design Line for α Values for Piles Driven into Clays
99
6.5 Correlation between Allowable Bearing Pressure and RQD for a Jointed 105
Rock Mass
6.6 Determination of Allowable Bearing Pressure on Rock 107
6.7 Relationship between Deformation Modulus and RMR for a Jointed 108
Rock Mass
6.8 Allowable Bearing Pressure Based on RMR Value for a Jointed Rock 110
Mass beneath Piles
6.9 Determination of Allowable Bearing Capacity on Rock 112
6.10
Load Distribution in Rock Socketed Piles, φ' = 70°
115
6.11
Load Distribution in Rock Socketed Piles, φ' = 40°
115
6.12 Mobilised Shaft Resistance in Piles Socketed in Rock 116
6.13 Failure Mechanisms for Belled Piles in Granular Soils Subject to Uplift 120
Loading
18
Figure Pa
g
e
No. No.
6.14 Failure Modes of Vertical Piles under Lateral Loads 122
6.15 Coefficients K
qz
and K
cz
at depth z for Short Piles Subject to Lateral 123
Load
6.16 Ultimate Lateral Resistance of Short Piles in Granular Soils 125
6.17 Ultimate Lateral Resistance of Long Piles in Granular Soils 126
6.18 Influence Coefficients for Piles with Applied Lateral Load and Moment 127
(Flexible Cap or Hinged End Conditions)
6.19 Influence Coefficients for Piles with Applied Lateral Load (Fixed 128
against Rotation at Ground Surface)
6.20 Reduction Factors for Ultimate Bearing Capacity of Vertical Piles under 130
Eccentric and Inclined Loads
6.21 Estimation of Negative Skin Friction by Effective Stress Method 133
6.22 Definition of Marble Quality Designation (MQD) 138
6.23 Bending of Piles Carrying Vertical and Horizontal Loads 144
6.24 Buckling of Piles 145
6.25 Load Transfer Analysis of a Single Pile 147
6.26 Closed-form Elastic Continuum Solution for the Settlement of a 149
Compressible Pile
6.27 Depth Correction Factor for Settlement of a Deep Foundation 151
6.28 Analysis of Behaviour of a Laterally Loaded Pile Using the Elastic 161
Continuum Method
7.1 Results of Model Tests on Groups of Instrumented Driven Piles in 168
Granular Soils
7.2 Failure Mechanisms of Pile Groups 170
7.3 Results of Model Tests on Pile Groups in Clay under Compression 172
7.4 Results of Model Tests on Pile Groups for Bored Piles and Footings in 174
Granular Soil under Tension
19
Figure Pa
g
e
No. No.
7.5 Polar Efficiency Diagrams for Pile Groups under Eccentric and Inclined 176
Loading
7.6 Determination of Distribution of Load in an Eccentrically-loaded Pile 177
Group Using the 'Rivet Group' Approach
7.7 Equivalent Raft Method 181
7.8 Typical Variation of Group Settlement Ratio and Group Lateral 183
Deflection Ratio with Number of Piles
7.9 Group Interaction Factor for the Deflection of Pile Shaft and Pile Base 184
under Axial Loading
7.10 Calculation of Stiffness Efficiency Factor for a Pile Group Loaded 186
Vertically
7.11 Interaction of Laterally Loaded Piles Based on Elastic Continuum 189
Method
7.12 Reduction of Lateral Load and Deflection of Piles in a Pile Group 190
7.13 Analysis of a Piled Raft Using the Elastic Continuum Method 196
8.1 Pile Head Protection Arrangement for Driven Concrete Piles 202
8.2 Measurement of Pile Set 216
8.3 Relationships between Peak Particle Velocity and Scaled Driving 224
Energy
8.4 Typical Profile of Empty Bore Deduced from Ultrasonic Echo 240
Sounding Test
8.5 Possible Defects in Bored Piles due to Water-filled Voids in Soils 245
8.6 Detection of Pile Defects by Sonic Coring 256
8.7 Typical Results of a Vibration Test 257
8.8 Examples of Sonic Integrity Test Results 261
9.1 Typical Arrangement of a Compression Test using Kentledge 269
9.2 Typical Arrangement of a Compression Test using Tension Piles 270
20
Figure Pa
g
e
No. No.
9.3 Typical Arrangement of an Uplift Test 271
9.4 Typical Arrangement of a Lateral Loading Test 272
9.5 Typical Instrumentation Scheme for a Vertical Pile Loading Test 278
9.6 Typical Load Settlement Curves for Pile Loading Tests 281
9.7 Comparison of Failure Loads in Piles Estimated by Different Methods 283
9.8 Definition of Failure Load by Brinch Hansen's 90% Criterion 284
9.9 Analysis of Lateral Loading Test 288
A1 Relationship between Maximum Mobilised Average Shaft Resistance
356
and Mean Vertical Effective Stress for Replacement Piles Installed in
Saprolites
A2 Relationship between Maximum Mobilised Average Shaft Resistance 357
and Mean SPT N Values for Replacement Piles Installed in Saprolites
A3 Relationship between Maximum Mobilised Average Shaft Resistance 358
and Mean Vertical Effective Stress for Replacement Piles with Shaft-
grouting Installed in Saprolites
A4 Relationship between Maximum Mobilised Average Shaft Resistance 359
and Mean SPT N Values for Replacement Piles with Shaft-grouting
Installed in Saprolites
A5 Relationship between Maximum Mobilised Average Shaft Resistance 360
and Mean Vertical Effective Stress for Displacement Piles Installed in
Saprolites
A6 Relationship between Maximum Mobilised Average Shaft Resistance 361
and Mean SPT N Values for Displacement Piles Installed in Saprolites
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