Drilled Shafts in Rock: Analysis and Design, 1st Edition (Hardback) book cover

Drilled Shafts in Rock

Analysis and Design, 1st Edition

By Lianyang Zhang

CRC Press

396 pages

Purchasing Options:$ = USD
Hardback: 9789058096500
pub: 2004-05-15
$255.00
x
eBook (VitalSource) : 9780429215858
pub: 2004-05-15
from $127.50


FREE Standard Shipping!

Description

Drilled shafts in rock are widely used as foundations of heavy structures such as highway bridges and tall buildings. Although much has been learned about the analysis and design of drilled shafts in rock, all the major findings are published in the form of reports and articles in technical journals and conference proceedings. This book is the first to present and summarize the latest information in one volume, highlighting for the reader the principle differences between foundations in soil, and foundations in rock masses containing discontinuities.

This book presents methods for characterizing discontinuities in jointed rock masses, and considering their effects on the behaviour of drilled shafts. A valuable tool for practitioners in geological engineering, rock mechanics and foundation engineering.

Table of Contents

Preface

1 Introduction

  • 1.1 Definition of Drilled Shafts
  • 1.2 Historical Development of Drilled Shafts
  • 1.3 Use of Drilled Shafts
  • 1.4 Characteristics of Drilled Shafts in Rock
  • 1.4.1 Effect of discontinuities
  • 1.4.2 Effect of groundwater
  • 1.4.3 Effect of karstic formations
  • 1.5 Considerations in the Design of Drilled Shafts

2 Intact rock and rock mass

  • 2.1 Introduction
  • 2.2 Intact Rock
  • 2.2.1 Geological classification
  • 2.2.2 Engineering classification
  • 2.2.3 Typical values of intact rock properties
  • 2.3 Rock Mass
  • 2.3.1 Rock quality designation (RQD)
  • 2.3.2 Rock mass rating (RMR)
  • 2.3.3 Rock mass quality (Q)
  • 2.3.4 Geological strength index (GSI)

3 Characterization of discontinuities in rock

  • 3.1 Introduction
  • 3.2 Types of Discontinuities
  • 3.3 Important Properties of Discontinuities
  • 3.4 Stereographic Projection
  • 3.4.1 Hemispherical projection of a plane
  • 3.4.2 Plotting and analysis of discontinuity orientation data
  • 3.5 Statistical Analysis of Discontinuity Properties
  • 3.5.1 Discontinuity orientation
  • 3.5.2 Discontinuity spacing and frequency
  • 3.5.3 Discontinuity trace length
  • 3.5.4 Discontinuity size
  • 3.6 Fracture Tensor for Describing Discontinuity Geometry

4 Deformability and strength of rock

  • 4.1 Introduction
  • 4.2 Deformability and Strength of Rock Discontinuities
  • 4.2.1 Deformation behavior of rock discontinuities
  • 4.2.2 Shear strength of rock discontinuities
  • 4.3 Deformability of Rock Mass
  • 4.3.1 Definition of modulus
  • 4.3.2 Empirical methods for estimating rock mass deformation modulus
  • 4.3.3 Equivalent continuum approach for estimating rock mass deformation modulus
  • 4.3.4 Direct consideration of discontinuities in numerical analysis
  • 4.4 Strength of Rock Mass
  • 4.4.1 Empirical strength criteria for rock mass
  • 4.4.2 Equivalent continuum approach for estimating rock mass strength
  • 4.4.3 Direct consideration of discontinuities in numerical analysis
  • 4.5 Scale Effect
  • 4.5.1 Scale effect on strength of rock mass
  • 4.5.2 Scale effect on deformability of rock mass
  • 4.6 Discussion

5 Site investigation and rock testing

  • 5.1 Introduction
  • 5.1.1 Preliminary investigation
  • 5.1.2 Detailed investigation
  • 5.1.3 Review during construction and monitoring
  • 5.2 Discontinuity Sampling on Exposed Rock Faces
  • 5.2.1 Scanline sampling
  • 5.2.2 Window sampling
  • 5.2.3 Photographic mapping
  • 5.3 Borings
  • 5.3.1 Rock core boring
  • 5.3.2 Inspecting borehole walls
  • 5.3.3 Large-diameter borings
  • 5.4 Exploratory Excavations
  • 5.4.1 Test pits and trenches
  • 5.4.2 Exploratory tunnels
  • 5.5 Geophysical Explorations
  • 5.5.1 General description
  • 5.5.2 Seismic methods
  • 5.5.3 Electrical resistivity method
  • 5.5.4 Ground penetration radar
  • 5.6 Laboratory Testing
  • 5.7 In Situ Testing
  • 5.7.1 General description
  • 5.7.2 Strength tests
  • 5.7.3 Deformability tests

6 Axial load capacity of drilled shafts in rock

  • 6.1 Introduction
  • 6.2 Capacity of Drilled Shafts Related to Reinforced Concrete
  • 6.3 Capacity of Drilled Shafts Related to Rock
  • 6.3.1 Side shear resistance
  • 6.3.2 End bearing resistance
  • 6.4 Capacity of Drilled Shaft Groups
  • 6.5 Uplift Capacity

7 Axial deformation of drilled shafts in rock

  • 7.1 Introduction
  • 7.2 Load-transfer (t-z curve) Method
  • 7.2.1 Linear analysis
  • 7.2.2 Nonlinear analysis
  • 7.3 Continuum Approach
  • 7.3.1 Linear continuum approach
  • 7.3.2 Nonlinear continuum approach
  • 7.4 Finite Element Method (FEM)
  • 7.5 Drilled Shaft Groups
  • 7.5.1 Settlement ratio method
  • 7.5.2 Equivalent pier method
  • 7.5.3 Finite element method (FEM)

8 Lateral load capacity of drilled shafts in rock

  • 8.1 Introduction
  • 8.2 Capacity of Drilled Shafts Related to Reinforced Concrete
  • 8.3 Capacity of Drilled Shafts Related to Rock
  • 8.3.1 Method of Carter and Kulhawy (1992)
  • 8.3.2 Method of Zhang et al. (2000)
  • 8.4 Capacity of Drilled Shaft Groups
  • 8.5 Discontinuum Method

9 Lateral deformation of drilled shafts in rock

  • 9.1 Introduction
  • 9.2 Subgrade-Reaction (p-y Curve) Approach
  • 9.2.1 Linear analysis
  • 9.2.2 Nonlinear analysis
  • 9.2.3 p-y curves for rock
  • 9.3 Continuum Approach
  • 9.3.1 Linear continuum approach
  • 9.3.2 Nonlinear continuum approach
  • 9.4 Finite Element Method (FEM)
  • 9.5 Discrete Element Method (DEM)
  • 9.6 Drilled Shaft Groups
  • 9.6.1 Deflection ratio approach
  • 9.6.2 p-y curve approach
  • 9.6.3 Finite element method (FEM)

10 Stability of drilled shaft foundations in rock

  • 10.1 Introduction
  • 10.2 Planar Sliding Failure
  • 10.3 Wedge Sliding Failure
  • 10.4 Toppling Failure
  • 10.5 Circular Failure

11 Drilled shafts in karstic formations

  • 11.1 Introduction
  • 11.2 Characteristics of Karstic Formations
  • 11.3 Investigation of Karstic Formations
  • 11.4 Considerations in the Design and Construction of Drilled Shafts in Karstic Formations
  • 11.5 An Example of Drilled Shaft Foundations in Karstic Formations

12 Loading test of drilled shafts in rock

  • 12.1 Introduction
  • 12.2 Axial Compressive Loading Test
  • 12.2.1 General comments
  • 12.2.2 Methods of applying loads
  • 12.2.3 Instrumentation
  • 12.2.4 Test procedures
  • 12.2.5 Interpretation of test data
  • 12.3 Axial Uplift Loading Test
  • 12.4 Lateral Loading Test
  • 12.4.1 General comments
  • 12.4.2 Methods of applying loads
  • 12.4.3 Instrumentation
  • 12.4.4 Test procedures
  • 12.4.5 Interpretation of test data
  • 12.5 Integrity Test of Drilled Shafts

References

Index

Subject Categories

BISAC Subject Codes/Headings:
TEC009020
TECHNOLOGY & ENGINEERING / Civil / General
TEC009150
TECHNOLOGY & ENGINEERING / Civil / Soil & Rock