Charles W.W. Ng – författare

This volume comprises a collection of four special lectures, six general reports and 112 papers presented at the Sixth International Symposium of Geotechnical Aspects of Underground Construction in Soft Ground (IS-Shanghai) held between 10 and 12 April 2008 in Shanghai, China.The Symposium was organised by Tongji University and the following themes were covered:1. Analysis and numerical modelling of deep excavations2. Construction method, ground treatment, and conditioning for tunnelling3. Case histories4. Safety issues, risk analysis, hazard management and control5. Physical and numerical modelling6. Calculation, design methods, and predictive toolsThis volume provides a valuable source of information on the the state-of-the-art in geotechnical engineering associated with the design, construction and monitoring of tunnels and excavations in soft ground, and will be of interest to academics and professionals involved in these areas.

Unsaturated soil is a three-phase material that is ubiquitous on the Earth’s surface and exhibits complex behaviour, which becomes more complex in response to the Earth’s changing climate and increasing engineering activities. This is because the former affects its moisture and temperature conditions significantly and the latter governs its stress state and suction condition. This book is designed to meet the increasing challenges of climate change and engineering activities by covering the mechanics and engineering of unsaturated soil in a logical manner. It comprises four major parts:Water retention and flow characteristicsShear strength and stiffness at various temperaturesState-dependent elasto-plastic constitutive modellingField monitoring and engineering applicationsThis second edition uniquely covers fundamental topics on unsaturated soil that are not covered in other similar books, including:the state- dependency of soil- water retention behaviour and water permeability functions, such as dependence on engineering activitiessmall strain stiffness considering the influence of wetting- drying cycles and recent suction history, such as that due to climate changesuction effects on dilatancy and peak shear strengthcyclic thermal effects on soil behaviourstate- dependent elastoplastic constitutive modelling of monotonic and cyclic behaviourengineering applications such as the South-to-North Water Transfer Project; an earthen landfill cover system devoid of geomembrane in the Xiaping landfill, Shenzhen; and a 15-m-deep multi- propped excavation in Tianjin, China