Client-Contractor Collaboration for Integrated TBM Process and Geotechnical Control – Power Grid Cable Tunnels Singapore

For many years partnering has been a well-established principle for promoting a “best for project” culture within a construction contract. This endeavours to remove the adversarial nature of classical “engineer’s design” contracts by openly discussing issues which may impact on project performance and look to engineer ways to mitigate them within the terms of the contract...

Mission Control; Monitoring Temporary Works in Tunnels

The March presentation to the British Tunnelling Society describes the application of ‘cloud based data’ to real time review of temporary works performance against design within tunnels, illustrated by a number of example projects in the UK and Hong Kong...

The Contribution of Computer Systems to the Management of Geotechnical and Construction Risk on the Klang Valley MRT SBK Line Underground Works

The recommendation of the joint code of practice for tunnel works promulgated by the International Tunnelling Societies and Insurers requires that active risk management form an integral part of every tunnel project. Tunnelling hazards and risks should be constantly viewed during the course of a project with effective systems put in place to do so. These systems should ensure effective communication of risk mitigation actions...

A Review of Human and Electronic Systems for the Safe Delivery of Tunnel Projects

The objective of all tunnel projects is to deliver the completed tunnel in time and in budget within acceptable environmental impact guidelines. This requires a complex interaction between a large number of people and between people and machines. Systems make all this work. Good systems can lead a project to its objective whilst poor systems can hinder...

Detecting Adverse Rock Condition ahead of Tunnels by Interpreting Jumbo Percussion Drill Logs

Most often geological site investigation for tunneling projects does not include directional cored bore holes covering the whole future tunnel alignment. In that case a need arises to test the rock mass condition ahead of the tunnel by short probes together with tunnel advance. In Hong Kong tunneling practice this need is recognized particularly in case of undersea tunnels and specified by the Client in conditions of contract...

Settlement Due to Under-Drainage: Transient Characteristics and Control Measures

The flow of water into tunnels and the lowering of ground water levels is a transient process governed by the permeability of the ground, the storage of the various reservoirs and the available recharge. The resulting settlement is a function not only of the compressibility of the deposits but also of their ability to drain. This paper draws on a large database of information both from Hong Kong and worldwide to examine the transient behavior of the ground during drawdown...

Risk Management for Ground Engineering Works: the Role of Independent Monitoring Consultant

The engineering community has successfully completed many exceptionally challenging construction projects. Unfortunately, history has shown that on occasion political, time and monetary pressures have exceeded those of the water and ground, sometimes leading to failure. Authorities have attempted to mitigate these risks through the implementation of a variety of independent design checkers and verifiers and through the provision of supervisory teams on site...