Haruna Tunnel (榛名トンネル, はるなトンネル) is a tunnel on JR East-Joetsu Shinkansen line in Japan that runs from Nakazato-cho, Takasaki city to Kawashima, Shibukawa city, in Gunma prefecture with approximate length of 15.350 km.[1] It was completed and opened in 1981.[2][3][4]
 Haruna Tunnel on Joetsu Shinkansen | |
| Overview | |
|---|---|
| Line | Joetsu Shinkansen |
| Location | Takasaki – Shibukawa |
| Coordinates | 36°31′7.9422″N 138°58′16.446″E / 36.518872833°N 138.97123500°E |
| Operation | |
| Opened | 1981 |
| Operator | JR East |
| Character | Passenger and freight |
| Technical | |
| Line length | 15,350 m (50,360 ft) |
Excavation was extremely difficult due to the poor geology consisting of volcanic mud flow sediments and water inflow reaching a maximum of 110 t/min, so injection, two-stage silot, and pressurization methods were used in combination. The discharge of tunnel water also affected the ground surface, causing a decrease and depletion of well water, irrigation water, and surface water.[5] In addition, on July 20, 1978, a 30-meter-wide cave-in occurred in the Yamakoda area of Haibuto-Mura. The fields and the Arai-Shimomurota line of Gunma Prefectural Road No. 154 were engulfed, and a large amount of earth and sand flowed into the tunnel directly below (Shimo-Arai construction area).[6]
See also
editReferences
edit- ^ "榛名トンネル(15,350m)". Touring JP website (in Japanese). Retrieved 12 October 2023.
- ^ Haruna Tunnel 30 meter hole in the ground, 11 families evacuated, landslide 75 meters underground "Asahi Shimbun" 1978 (Showa 53) July 18 morning edition, 13th edition, page 7
- ^ "Haruna Tunnel". Techno treasure reports (in Japanese). Retrieved 12 October 2023.
- ^ "Excavation of unconsolidated water-containing layer in Haruna-Nakayama Tunnel". CiNii article report. Retrieved 12 October 2023.
- ^ 「上越新幹線工事誌 大宮・水上間」昭和58年10月
- ^ トンネル 地面のむ 30メートルの穴 11世帯避難 地下75メートルで土砂崩壊『朝日新聞』1978年（昭和53年）7月18日朝刊、13版、7面
External links
edit- Gov. maps.gsi.go.jp
- Mapion maps
- Haruna Tunnel (in Japanese)
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