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論文
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Miyajima, Masakatsu ; Kitaura, Masaru ; Nomura, Yoshinori ; 宮島, 昌克 ; 北浦, 勝 ; 野村, 吉範
概要:
金沢大学理工研究域地球社会基盤学系<br />The present paper deals with the response of pipelines subjected to liquefaction-induced permanen
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t ground displacement and the subsequent failure of pipelines is discussed. Initially here, characteristics of permanent ground displacement are investigated based on model experiments. Next, formulae obtained by a beam theory are established and preliminary analysis is carried out in order to understand fundamental characteristics of continuous pipelines. Furthermore, response simulations are conducted for jointed pipelines by using a modified transfer matrix method. We present the influential factors determining the magnitude of the ground displacements and propose the method for evaluation of pipeline response to permanent ground displacement.
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宮島, 昌克 ; 生田目, 尚美 ; 北浦, 勝 ; 中道, 佳彦 ; Miyajima, Masakatsu ; Namatame, Naomi ; Kitaura, Masaru ; Nakamichi, Yoshihiko
概要:
金沢大学理工研究域地球社会基盤学系<br />1995年兵庫県南部地震においては、多数の上水道管路に被害が生じ、復旧までに多くの日数を要した。管路被害は、液状化が大規模に発生した臨海埋立地や震災の帯と言われる激震地域に多く発生している。本研
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究では、液状化が顕著に発生したポートアイランドと激震地域に含まれている東灘区を取り上げ、修正伝達マトリックス法を用いた管路の応答解析を実施し、実被害との対応について検討した。その結果、液状化による地盤ばね定数の低減係数や管路のネットワーク形状と被害発生個所との関連について基礎的な知見を得ることができた。
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論文
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北浦, 勝 ; 宮島, 昌克 ; 鈴木, 広士 ; Kitaura, Masaru ; Miyajima, Masakatsu ; Suzuki, Hiroshi
概要:
金沢大学理工研究域地球社会基盤学系<br />Hybrid procedure is developed in order to analyze the behavior of buried pipelines in soil liquef
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action processes. The procedure presented herein consists of a ground response evaluation using the finite element method and a pipe response analysis using the transfer matrix method. A rise of the ground water table induced by dissipation of excess pore water pressure is considered in the former evaluation. Numerical models show that the unsaturated layer around the pipelines liquefies due to the rise of the ground water table and accumulation of the excess pore water pressure. It is evident from the present study that the response characteristics of the buried pipelines change in the liquefaction process.
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