Advocacy of Risk Management System Introduction in Tunnel Geological Investigation

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  • トンネル地質調査におけるリスクマネジメントシステム導入の提唱
  • トンネル チシツ チョウサ ニ オケル リスク マネジメント システム ドウニュウ ノ テイショウ

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Abstract

There are some special conditions in the mountain tunneling method, such as 1) the geographical features of the location point is steep and the installation depth is deep, 2) the structure is long in the line, and 3) the geological investigation amount is very limited. Therefore, it can be said that the geological investigation has a difficult, technical, economical condition compared with the dam and the bridge base in a decided site, and is relatively low the forecast conviction level.<BR>However, the uncertainty of such an investigation is not systematically transmitted enough to the post-processing, and the investigation accuracy and the unelucidation point have been succeeded to the design and the construction stage indistinctly. Especially, it is thought that prior geological information is not efficiently used at the construction stage, the case with a great change is generated in the safety management, the cost management, and the production control, etc., and misunderstanding and distrust result easily for the engineer in the investigation field.<BR>On the other hand, enforcement of the law of making to propriety of the tender and the contract, design construction batch order method, and construction CALS are introduced in recent years. It is in the tendency to which the transparency of ground information and making to the data base and system of opening to the public are rapidly promoted in the future.<BR>We report on the current state of the incompleteness of the ground information transmission and of risk communications shortage here. To decrease the ground disaster at the construction stage beforehand, we advocate the introduction of the risk management system which applies at the geological investigation stage.

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