Risk assessment associated with geotechnical problems Pokhara City, Nepal

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H02631
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Geotechnical engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Kiyota Takashi 東京大学, 生産技術研究所, 准教授 (70431814)
• Co-Investigator(Kenkyū-buntansha): 桑野 玲子 東京大学, 生産技術研究所, 教授 (80312974)
• Co-Investigator(Renkei-kenkyūsha): IKEDA Takaaki 長岡技術科学大学, 工学研究科, 教授 (40443650) ; KATAGIRI Toshihiko 東京大学, 生産技術研究所, 技術専門職員 (70724459)
• Research Collaborator: YAGIURA Yoshiyuki 基礎地盤コンサルタンツ株式会社
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 地盤陥没 / 表面波探査 / ＵＡＶ / 動的コーン貫入試験 / 液状化

Outline of Final Research Achievements

In order to assess the risk associated with sinkhole problem and earthquake-induced liquefaction in Pokhara, Nepal, a series of field survey, including surface geological reconnaissance, were conducted in Armala area and the city area. A number of sinkholes have been occurring in Armala area since November 2013. Although immediately after the sinkhole event, most of the sinkholes were backfilled by using local sandy and gravelly soils, they were re-activated during the rainy season. The surface geological reconnaissance suggested that the sinkholes are distributed along the old Duhuni Khola or the old Kali Khola. The results also indicate that it would be possible for cavities to be detected by using mini-ram sounding and surface wave test. In the city area, liquefaction assessment was conducted by means of mini-ram sounding. It was found that the city area has a low potential for liquefaction because of soil condition and deep ground water table.

Free Research Field

地盤工学