Published 2019
| Version v1
Journal article
Hydrochemical influence of shotcrete used in underground facilities on groundwater chemistry. Proposal of the evaluation method by geochemical simulation code
- 1. Japan Atomic Energy Agency, Tono Geoscience Center, Mizunami, Gifu (Japan)
- 2. Taiheiyo Consultant Co., Ltd., Sakura, Chiba (Japan)
Description
In order to clarify the influence of shotcrete in the underground facility on the groundwater chemistry, an in-situ closed test of the mock-up tunnel was conducted at the depth of 500 m in granite. Portlandite, ettringite, gibbsite, K2CO3, natron, amorphous silica, calcite and brucite / nesquehonite were identified as the dominant minerals affecting the water chemistry. Furthermore, the shotcrete constructed in the tunnel has a reaction capacity which can produce about 570 m3 of alkaline groundwater (pH 12.4) saturated with Ca(OH)2. The estimation would improve the accuracy of prediction analysis of the long-term chemical influence of cement materials after the tunnel closure. (author)
Availability note (English)
Available from DOI: https://doi.org/10.2208/jscejer.75.42Abstract (Japanese)
地下施設における吹付けコンクリート支保工が地下水水質に与える影響を明らかにするため,深度500mの花崗岩に掘削した坑道(容積約900 m3)を閉鎖する実規模原位置試験を行った.閉鎖坑道内の水質観察,吹付けコンクリートの分析,それらに基づく水質再現解析の結果,portlandite, ettringite, amorphous silica, calcite, gibbsite, K2CO3, natron, bruciteもしくはnesquehoniteの溶解・沈殿反応が水質に影響する主要反応であると推察された.更に,坑道内に施工された吹付けコンクリートはportlanditeに飽和した地下水(pH12.4)を約570 m3生成する反応量を持つと見積もることができた.これにより坑道閉鎖後の長期的なセメント材料の化学影響の予測解析確度が向上すると考えられた.(著者)Additional details
Additional titles
- Original title (Japanese)
- 地下施設で使用する吹付けコンクリートが地下水水質に与える影響.地球化学計算コードによる評価方法の提案
Identifiers
Publishing Information
- Journal Title
- Doboku Gakkai Ronbunshu G. Kankyo (Online)
- Journal Volume
- 75
- Journal Issue
- 1
- Series
- 雑誌名:土木学会論文集G (環境)
- Journal Page Range
- p. 42-54
- ISSN
- 2185-6648
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 52097532
- Subject category
- S58: GEOSCIENCES;
- Descriptors DEI
- CALCIUM SILICATES; CONCRETES; DIFFUSION BARRIERS; GEOLOGY; GRANITES; GROUND WATER; HYDRAULICS; MINES; P CODES; PH VALUE; PORTLAND CEMENT; RADIOACTIVE WASTE DISPOSAL; RADIONUCLIDE MIGRATION; UNDERGROUND DISPOSAL; WATER QUALITY
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CEMENTS; COMPUTER CODES; ENVIRONMENTAL QUALITY; ENVIRONMENTAL TRANSPORT; FLUID MECHANICS; HYDROGEN COMPOUNDS; IGNEOUS ROCKS; MANAGEMENT; MASS TRANSFER; MATERIALS; MECHANICS; OXYGEN COMPOUNDS; PLUTONIC ROCKS; RADIOACTIVE WASTE MANAGEMENT; ROCKS; SILICATES; SILICON COMPOUNDS; UNDERGROUND FACILITIES; WASTE DISPOSAL; WASTE MANAGEMENT; WATER
Optional Information
- Notes
- 31 refs., 10 figs., 3 tabs.