巻号一覧
26 巻 (1985)
- 4 号 p. 151-
- 3 号 p. 111-
- 2 号 p. 43-
- 1 号 p. 1-
26 巻, 3 号
選択された号の論文の3件中1～3を表示しています
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竹内 篤雄, 根本 芳男, 土屋 彰義1985 年 26 巻 3 号 p. 111-120
発行日: 1985/09/30
公開日: 2010/02/23
ジャーナル フリーElectrical Resistivity survey has been carried out hitherto in order to find out places being easy to flow ground water in an old-river channel. According to the interpretation of the results, all of high resistivity zones have had to be regarded as places being easy to flow ground water. Therefore we had to consider very wide zone as flowing ground water with unsatisfactory. Accordingly, the survey method was not so desirable in the case of considering a concrete counterplan for conservation of banks. It was necessary to improve such a condition.
We adopted a new method “Investigation Method by Measuring Underground Temperature” in order to detect places being easy to flow ground water in a old-river channel which had possibility to have bad influence on banks. It was shown the some abnormal temperature parts existed in the high resistivity zone by the results of the new method. In this fact, it is elucidated that places being easy to flow ground water is detected more accurately by carrying out the underground temperature survey than by carrying out the electrical resistivity survey.
Some bore holes were dug in each parts of an abnormal temperature part and a normal temperature part in a same high resistivity zone with the object of inspecting this point, and a few test which were concerned with ground-water (observation of ground-water level, temperature logging, different temperature logging, and pumping test) were carried out by using these bore holes. By the results of these test, we could recognized clearly flowing ground water in an abnormal temperature part, but could not recognized flowing ground water in a normal temperature part in the same high resistivity zone.
As mentioned above, we estimated that the investigation method by measuring underground temperature was better than the electrical resistivity survey method in order to detect places being easy to flow ground water in old-river channels.抄録全体を表示PDF形式でダウンロード (1285K) -
杉本 文男, 松木 浩二, 遠藤 修1985 年 26 巻 3 号 p. 121-128
発行日: 1985/09/30
公開日: 2010/02/23
ジャーナル フリーThe transient pulse method for measuring the permeability of intact rock was proposed after Brace et al. In this study, the testing apparatus based on Brace's idea is developed, and the effects of both pressure gradient and confining pressure are investigated experimentally for six kinds of rocks. Furthermore, the obtained test results are compared with the theoretical calculations where the effects of porosity and compressibility of rocks are taken into consideration.
Main results are summarized as follows:
1) The permeability of the rock, which is less than 10-9cm/sec, is successfully measured with the transient pulse method.
2) If the permeability of the rock is greater than 10-9cm/sec, it increases as the pressure gradient increases and decreases as the confining pressure increases. Consequently, it is important to choose the testing conditions according to in-situ state of stresses for these rocks.
3) The effect of pressure gradient or confining pressure is very small for the rocks which have the permeability of less than 10-9cm/sec.
4) If the effects of porosity and compressibility of the rock are considered in establishing the theoretical relationship between the permeability and the presure-decay data, larger permeability is obtained than that estimated after Brace at least for the rock which contains only spherical pores.抄録全体を表示PDF形式でダウンロード (889K) -
田中 芳則1985 年 26 巻 3 号 p. 129-135
発行日: 1985/09/30
公開日: 2010/02/23
ジャーナル フリーThis report is concerned with the relation between the eluviation which is one of the important action of chemical weathering and the change of physical properties of rocks. The author carried out the experiment in which two types of mudstone containing calcite were used as a sample and eluted by acetic acid.
Then he compared the physical properties of mudstone before and after the elution of calcite.
The most remarkable change of physical properties with the elution of calcite results in the mechanical quantity such as compressive strength and the like, dry shrinkage ratio and porosity. Shore hardness and unit weight are next to these properties. Specific gravity is less changeable.
The change of physical properties can be classified into two types. One of these is the change related to the calcite content. The change of porosity, unit weight and specific gravity correspond to this type, which is remarkable for a large quantity of calcite at the initial condition. Another type is the change related to the state of calcite in the mudstone. Compressive strength and dry shrinkage ratio belong to this type. In this case, the extent of change depends on a role which the calcite has been playing in the texture of mudstone before the elution.抄録全体を表示PDF形式でダウンロード (996K)
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