Mechanism of fracture permeability in crystalline rock under controlled stress and temperature conditions
| Project/Area Number |
21560521
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geotechnical engineering
|
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
KINOSHITA Naoki 愛媛大学, 大学院・理工学研究科, 助教 (30263958)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
YASUHARA Hideaki 愛媛大学, 大学院・理工学研究科, 准教授 (70432797)
|
|---|
| Project Period (FY) |
2009 – 2011
|
| Project Status |
Completed (Fiscal Year 2011)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
|
|---|
| Keywords | 熱水貯蔵システム / 岩石不連続面 / 岩盤透水性 / 溶解沈殿現象 / 鉱物溶解現象 / 結晶質岩 |
|---|
| Research Abstract |
In this study, flow-through experiments on a single fracture in granite has been carried out under confining pressures of 5-10 MPa, and at temperatures of 20-90℃. The fracture aperture and the permeability monotonically decreased with time at room temperature, and reached a quasi-steady state. Then, after the temperature was raised to 90℃, the aperture decreased again throughout the rest of the experiments. Fluid samples were taken from the outlet to examine the elemental concentrations that were evaluated by inductively-coupled plasma atomic emission spectrometry(ICP-AES). The elemental concentrations increased with increase of temperature. After the flow-through experiments, the fracture surface was observed by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy(SEM-EDX). The formation of a few kinds of precipitated minerals such as silica and calcite was revealed. The precipitation was limited to quite local and small areas. However, the precipitated minerals seemed to have had some influences on the permeability.
|
Report
(4 results)
Research Products
(13 results)
