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  Contractual Management of Geological Risks and Construction Programme International Standards and Case Histories

  The geo-uncertainty of underground projects most often leads to differences between foreseen and encountered geo-conditions. Dealing with this uncertainty is a major challenge as it often raises claims and complex contractual problems mostly related to the construction programme. Over the last years, contract management tools have been developed in order to manage this risk. One of the key aspects for the successful delivery is the elaboration of a mechanism to adjust the time for completion. The Schedule of Baselines defines the advance rates of the activities and the way ground conditions may affect the contractual time for completion. The clear allocation of duties and risks between the Employer and the Contractor, together with its proper integration in the contractual frame-work, play a crucial role in the project development. This paper presents cases of implementation of such a contractual mechanism in several Countries, standard forms of contract and excavation methods together with the comparison with the FIDIC standard.

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