著者

前田 寛之 河野 勝宣 辻 健史 久保 仁美 青木 秀晃

出版者

公益社団法人 日本地すべり学会

雑誌

日本地すべり学会誌 (ISSN:13483986)

巻号頁・発行日

vol.52, no.1, pp.15-20, 2015 (Released:2015-07-30)

参考文献数

20

被引用文献数

2

著者

奈良 禎太 加藤 昌治 佐藤 努 河野 勝宣 佐藤 稔紀

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.4, pp.44-50, 2022-04-28 (Released:2022-04-28)

参考文献数

34

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It is important to understand the long-term migration of radionuclides when considering rock engineering projects such as the geological disposal of radioactive waste. The network of fractures and pores in a rock mass plays a major role in fluid migration as it provides a pathway for fluid flow. The geometry of a network can change due to fracture sealing by some fine-grained materials over long-term periods. Groundwater usually contains finegrained minerals such as clay minerals, and it is probable that the accumulation of such minerals occurs within a rock fracture upon groundwater flow, thereby decreasing the aperture of a fracture and the permeability. It is therefore essential to conduct permeability measurements using water that includes fine-grained minerals to understand the permeability characteristics of a rock; however, this has not been studied to date. In the present study, we use a macro-fractured granite sample to investigate the change of permeability that occurs under the flow of water that includes two different amounts of clay. Findings showed that clay accumulated in a fracture and that the permeability (hydraulic conductivity) of the granite sample decreased over time, which was greater in for the higher clay content. We concluded that the accumulation of clay minerals in the fracture decreased the permeability of the rock. Furthermore, we consider that the filling and closure of fractures in rock is possible under the flow of groundwater that includes clay minerals.

著者

河野 勝宣 神田 貴宏

出版者

公益社団法人 日本都市計画学会

雑誌

都市計画論文集 (ISSN:09160647)

巻号頁・発行日

vol.27, pp.55-60, 1992-10-25 (Released:2019-12-01)

参考文献数

7

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THIS STUDY AIMS TO MAKE CLEAR THE CHANGES IN THE URBAN STRUCTURE OF CITIES IN THE TOKYO'S 30-KM AREA AND THEN, BASED UPON THESE CHANGES, TO FIND OUT POSSIBLE PLANNING ISSUES AND PROBLEMS THROUGH A CASE STUDY OF THE HISTORY OF URBANIZATION OF NODA CITY, CHIBA PREFECTURE. FOR THIS PURPOSE, WE DIVIDED NODA'S URBANIZATION HISTORY INTO THREE PERIODS IN ACCORDANCE WITH CHANGING RELATIONSHIP BETWEEN THE LOCAL GOVERNMENT AND EMPLOYMENT. OUR FINDINGS INCLUDE THE EXISTENCE OF DIFFERENT “COMMUNITIES” IN DIFFERENT PERIODS OF URBANIZATION AND THE NEED FOR, AND IMPORTANCE OF THE LOCAL GOVERNMENT TO CONTROL EFFECTIVELY THE PRIVATE URBAN DEVELOPMENT.

著者

河野 勝宣 前田 寛之

出版者

The Japan Landslide Society

雑誌

日本地すべり学会誌 : 地すべり = Journal of the Japan Landslide Society : landslides (ISSN:13483986)

巻号頁・発行日

vol.50, no.3, pp.121-129, 2013-05-25

被引用文献数

1

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本論文は,北海道黄壁沢-シケレベンベツ川地すべり地域における全斜面の地形,地質,地質構造および熱水変質帯に加えて,岩石の強さを簡便かつ迅速に評価できる不定形点載荷強さ試験に基づく熱水変質岩の力学特性を考慮し,AHP法に基づくランドスライドハザードマップを作成し,ランドスライドハザードアセスメントを試みた。<br>  斜面におけるランドスライド危険度は,素因分析項目からAHP法による評点累計によって評価し,I~Vのハザードランクに分類した。ランクIは安定硬岩盤斜面,ランクIIは安定軟岩盤斜面,ランクIIIは不安定軟岩盤斜面,ランクIVは新規の地すべり発生が懸念される不安定な区域およびランクVは再活動型地すべりが懸念される最も不安定な古期地すべり地である。