巻号一覧
32 巻, 5 号
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石島 洋二, 薛 自求, 高橋 学1991 年 32 巻 5 号 p. 209-220
発行日: 1991/12/10
公開日: 2010/02/23
ジャーナル フリーA series of permeability tests were performed on Shirahama sandstone and Horonobe mudstone of the Neocene under triaxial stress and pore pressure conditions. Main results are as follows:
Firstly, for loading condtions, effect of pore pressure on the permeability is less than that of hydrostatic pressure. At the same time, permeability-pressure curve bends at a certain pressure, at which volumetric strainpressure also bends accordingly. For unloading condition, contrary to the loading one, permeability is not altered by the pressure change.
Secondly, the permeability abruptly increases accompanying to the fracture. But the permeability-pressure curve is much steeper than the one for the intact condition, at the onset of the pressurization, This means that the effect of the fracture planes on the permeability is quickly diminished, by virture of the increasing pressure.
These characteristics of the permeability should have close relationship with the microstructure of the rock. Stress analysis was conducted for the equivalent channel model, which can be interpreted to give a simplification of the real structure, assuming several material properties for the model medium. Predicted variations of the permeability in relation to the hydrostatic pressure and pore pressure are in good coincidence with the observations. Particularly, the case that the permeability-pressure and/or volumetric strain-pressure curves bend can well be explained when the medium is assumed to be composed of elastic material which changes its stiffness at certain pressure due the closure of microcracks.抄録全体を表示PDF形式でダウンロード (1957K) -
ローモンタイトおよびスメクタイト荒井 融, 名取 二郎1991 年 32 巻 5 号 p. 221-231
発行日: 1991/12/10
公開日: 2010/02/23
ジャーナル フリーLaumontite and montmorillonite, known as reactive minerals in concrete, are often observed in some quarry sites of the “Green Tuff Region”. Laumontite and interstratified chlorite/smectite in aggregates from Miocene volcanics were analysed with an X-ray powder diffraction method quanitatively.
An internal standard method was used to avoid the dependence on the mass absorption coefficient and the analytical conditions were selected experimentally. Errors in measurements without monochrometer are as follows,
laumontite (1-2%): 2σ=±0.17% (detective limit: 0.3%)
disordered chlorite/smectite interstratified mineral (10-20%): relative error ±25%
Influence of the X-ray peak of coexisting stilbite and mordenite on that of laumontite are correctable. The probabilities of existence of component layers in the interstratified minerals were obtained from the X-ray profiles from samples immersed in ethylene glycol. The ratio of interstratified chlorite and smectite layers can also be estimated from the intensity ratio of (001) / (002) peaks without any chemical treatment.抄録全体を表示PDF形式でダウンロード (1792K) -
高橋 学1991 年 32 巻 5 号 p. 232-239
発行日: 1991/12/10
公開日: 2010/02/23
ジャーナル フリーTo characterize water infiltration into dry cracks, P wave velocity and amplitude ratio in various directions of Yamaguchi fine grained marble were measured under true triaxial creep stress state where three principal stresses in specimen were kept constant during experiment. All waves traveled in a direction parallel to the axis of minimum principal stress. Water was infiltrated from the bottom of specimen through porous metal and end piece soon after true triaxial creep stress was held constant.
When the stress-induced microcracks in a rock are filled with permeating water, P wave velocity increased with time and amplitude ratio for first and second peaks of P waves are also influenced depending on the degree of the saturation of water. In each measuring path, amplitude ratio is observed to increase prior to increasing P wave velocity.抄録全体を表示PDF形式でダウンロード (1153K) -
石油地下備蓄基地における岩盤分類と総合評価蒔田 敏昭, 福竹 養造, 星野 延夫, 井口 敬次, 新見 健1991 年 32 巻 5 号 p. 240-251
発行日: 1991/12/10
公開日: 2010/02/23
ジャーナル フリーOn national energy storage projects, the underground oil storage projects are under construction at three sites in Japan. As to large-scale caverns excavated by NATM in deep, fresh and homogeneous rock masses, an attempt of rock classification and evaluation systems with an abbreviation “CHIKABI Classification System” was made. This classification system is composed mainly of “Rock Hardness” and “Joint Spacing”, with supplementary geological factors of “Weathering and/or Alteration degree”, “Joint plane conditions” and “Water seepage conditions”.
The design criteria of the caverns and their supporting measures were made based on the said classification and evaluation systems practically. In order to correlate the actual rock conditons with the rock evaluation results, in situ measurements of P-wave velocity have been carried out in the excavated caverns.
In this paper, a principal thought and practical applying conditons of the classification and evaluation systems and a part of the results are described.抄録全体を表示PDF形式でダウンロード (1788K) -
小川 正二1991 年 32 巻 5 号 p. 252-258
発行日: 1991/12/10
公開日: 2010/02/23
ジャーナル フリーPDF形式でダウンロード (756K)
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