Risk management is fast becom ing routine in civil engineering as owners, engineers, and contractors recognize the benefit of capturing, assessing, and planning for risks o n their pro jects. Recent experience has show n that risk m anagement techniques employed on tunnel projects can help reduce unexpected cost impacts and delays. However, capturing these risks and accurately predicting their impact is not a simple task as the nature of the ground is difficult to predict and this uncertainty can often have the greatest influence on the su ccess of the project. This paper discusses some of these techniq ues in detail and addresses how they can be used to h elp mitigate the most common cause of cost overruns and delays on tunnel projects, the ground and its behavior during construction. Details from case histories are presented to illustrate the influence that geotechnica 1 risks can have on tunnel projects and the techniques implemented to mitigate these risks are outlined.
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