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JAEA Reports

Study on characterisation of colloidal silica grout under condition of sea water

Toguri, Satohito*; Okihara, Mitsunobu*; Tsuji, Masakuni*; Nakashima, Hitoshi*; Sugiyama, Hirokazu*; Saito, Akira*; Sato, Toshinori; Aoyagi, Kazuhei; Masunaga, Kosuke

JAEA-Research 2017-013, 131 Pages, 2018/02

JAEA-Research-2017-013.pdf:8.49MB

The discussions on scientifically promising site for the geological disposal has been made at the council of studying group on techniques for geological disposal of radioactive wastes, which is held by Resources and Energy Agency. From the aspect of ensuring safety during the transportation of disposal waste, the coastal area is discussed to be a more suitable area. This report shows the result of the first year of this project as following items; Study on the state-of-art technology and remain tasks; laboratory tests on characterization of colloidal silica grout under sea water; Study on the development of grouting technology (design and the evaluation method of influence on the rock mass).

JAEA Reports

System management for aggregation of knowledge on marine geological survey in coastal areas

Takahashi, Tadao*; Sato, Toshinori; Masunaga, Kosuke

JAEA-Review 2017-030, 60 Pages, 2018/01

JAEA-Review-2017-030.pdf:4.32MB

The amount of the information such as the data, models and analysis results related to geological environment has been enormous. It is believed that an appropriate organization of the information is useful for conducting geological environment survey work at the candidate sites of geological disposal. The Survey on Geological Disposal Technology projects commissioned by METI that started in FY2015 handles various information such as the data, models, analysis results, etc. of geological environment. In this project, in preparation for collection and compilation of the information on geological environment in coastal areas, we have made clear the current status of the existing systems including databases. At the same time, we have created measures for centralized information management for the purpose of organizing a huge amount of information as well as sharing the information and information management systems among the related organizations.

Oral presentation

Technical know-how and decision process for site characterization on deep geological environment, 1; Optimization of a borehole investigation program in the Mizunami Underground Research Laboratory

Osawa, Hideaki; Amano, Kenji; Takeuchi, Shinji; Hama, Katsuhiro; Matsuoka, Toshiyuki; Masunaga, Kosuke

no journal, , 

no abstracts in English

Oral presentation

Case study of deep borehole collapse in the Tono area, Gifu Prefecture; Geological and geophysical analyses at collapsed sections for geological risk assessment

Masunaga, Kosuke; Amano, Kenji; Tsuruta, Tadahiko

no journal, , 

A case study of deep borehole collapse has been analyzed in the Tono area Gifu prefecture in order to estimate frequency and degree of the collapse during the borehole drilling that could become the risk factor of the characterization on the geological environment. As a result, the collapse occurred at the fractures and its adjacent part which has specific preferred orientations with major fractured zone.

Oral presentation

Case-based study for constructing knowledge-based methodologies of trouble in a borehole drilling; An Examples of borehole collapse in the Tono area, Gifu Prefecture, Japan

Masunaga, Kosuke; Amano, Kenji; Kunimaru, Takanori

no journal, , 

We have examined field examples of several kinds of troubles and their causes and measures on a deep borehole drilling. Moreover, frequency and characteristics focussing on the borehole collapse have been studed. As a result, many of collapse has been concentrated on the specific geological structure. Further studies should be needed on the accumulation of the troubleshooting examples on the deep borehole investigations and improvement of the risk assessment methodologies based on the three-dimensional geological model etc.

Oral presentation

Case-based study for constructing knowledge-based methodologies of trouble in a borehole drilling; An Examples of borehole collapse in the Tono area, Gifu Prefecture, Japan, 2

Masunaga, Kosuke; Amano, Kenji; Kunimaru, Takanori

no journal, , 

We tried to carry out a risk assessment on borehole collapse by establishing the collapse rule with applying a decision tree algorithm, in order to extract the factors and common features concerning the borehole collapse. The results suggest that collapse pattern might be characterized by a local rock characteristics and geological distribution. Moreover, the application of the collapse rule to the other location suggests that the rule might be utilized on knowledge acquisition in a case of little prior information, risk assessment and preparation of a countermeasures on the borehole collapse before drilling, and collapse prediction during drilling.

Oral presentation

Countermeasure against plant root intrusion into capping in Ningyo-toge Environmental Engineering Center

Masunaga, Kosuke; Saito, Hiroshi; Sato, Hisakazu*

no journal, , 

Ningyo-toge Environmental Engineering Center has carried out remediation activities for Ningyo-toge Uranium Mine, now out of service for mining in accordance with the Mine Safety Law, to ensure the radiation protection from the exposure pathways to humans in future and to prevent the occurrence of mining pollution. Some remediation activities has already done so far, including capping construction for the upstream of mill tailings pond by the end of FY2012. The purpose of the capping is to reduce dose rate radon exhalation rate and rain infiltration rate of the pond, which is considered as the most prioritized facility to remediate.Post-remedial maintenance must be reduced just like to lower the burden of water treatment in future by capping construction as is written above. For the reason, plant root intrusion, its long-term impact to the function of the capping and countermeasure have been studied as plant is expected to intrude into the pond through its surface as capping. The result shows that annual herbs will intrude followed by perennials herbs and woody plants which constitutes forest eventually. Also, it is estimated that the long-time duration makes it easier for woody plants to intrude before vegetation becomes dense if vegetation is subject to natural succession. For these reasons, controlled vegetation is thought to be suitable compared with natural vegetation. Also, in terms of factors including economy, tolerance to cold climate and root depth, grass-felt with the seedlings of Gramineae is chosen as most suitable countermeasure against erosion.

Oral presentation

A Study on the water purification mechanism in the mill tailings pond in Ningyo-toge Environmental Engineering Center

Masunaga, Kosuke; Tokoro, Chiharu*; Ohara, Yoshiyuki

no journal, , 

In Ningyo-toge Environmental Engineering Center, water level of mill tailings pond is planned to be lowered to reduce overflow risks caused by heavy rain etc., as a part of remediation activities of the Uranium Mine. It is known that the concentration of Fe and As and other elements in the mine drainage are decreased by retaining in the pond. The aims of this study are to reduce the load of water treatment facility and to determine the efficient countermeasure method for remediation of the mill tailings pond. To accomplish these, purification mechanisms of Fe and As in the pond were investigated, referring other studies. Chemical composition of water drainage in the pond was estimated by the chemical equilibrium analysis with advection using PHREEQC. The result of the simulation was almost reproducible for Fe. For As, it was reproducible when taking into account of surface complexation to ferrihydrite in sediment in the bottom of the pond.

Oral presentation

Study on characterization of liquid-type colloidal silica grout under sea water, 1; Outline of study

Masunaga, Kosuke; Sato, Toshinori; Okihara, Mitsunobu*; Tsuji, Masakuni*; Nakashima, Hitoshi*; Saito, Akira*

no journal, , 

Study on characterization of liquid-type colloidal silica grout under sea water has been performed for the countermeasures against water inflow in the underground construction. This report shows the outline of this study.

Oral presentation

Study on characterization of liquid-type colloidal silica grout under sea water, 3; Result of laboratory test

Nakashima, Hitoshi*; Okihara, Mitsunobu*; Tsuji, Masakuni*; Saito, Akira*; Sato, Toshinori; Masunaga, Kosuke

no journal, , 

Study on characterization of liquid-type colloidal silica grout under sea water has been performed. This report shows the results of laboratory tests.

Oral presentation

Study on characterisation of colloidal silica grout under sea water, 4; Basic prope rties of two types of new grout mix adapted to sea water

Nakashima, Hitoshi*; Saito, Akira*; Tsuji, Masakuni*; Sato, Toshinori; Aoyagi, Kazuhei; Masunaga, Kosuke*

no journal, , 

Study on characterization of liquid-type colloidal silica grout under sea water has been performed. This report shows the results of laboratory tests.

Oral presentation

Study on characterisation of colloidal silica grout under sea water, 5; Developing theoretical model and numerical simulation applicable to sea water

Tsuji, Masakuni*; Okihara, Mitsunobu*; Nakashima, Hitoshi*; Sato, Toshinori; Masunaga, Kosuke*

no journal, , 

Study on characterisation of colloidal silica grout under sea water including developing theoretical model and numerical simulation applicable to sea water has been performed.

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