Maui pipeline project : evaluation of as-built slope stability

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Riddolls, B.W. 1978 Maui pipeline project : evaluation of as-built slope stability. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 298 10 p.

Abstract: A study of stereo aerial photographs has indicated that the Maui gas pipeline is not sited in ground affected by landslides of similar size to that in north Taranaki where the Kapuni pipeline failed, but it does not cross several areas where slope instability has occurred. The terrain in these areas is invariably formed a fine-grained Tertiary sedimentary rocks, but most of the instability is attributed to thin overlying superficial deposits. Prediction of the future stability at these places is difficult, and it is not possible to determine the risk to the pipeline, especially because it is not known whether it has been located deep enough to avoid the influence of the potentially unstable superficial deposits. The localities where the pipeline intersects ground affected by slope instability, either now or in the past, are listed, and recommendations made for their monitoring or inspection according to the order of risks considered to be acceptable. It is recommended that the route be stereo-photographed to provide an accurate record of ground profiles after reinstatement. (auth)