All issues
Volume 42 (2001 - 200･･･
- Issue 6 Pages 335-
- Issue 5 Pages 264-
- Issue 4 Pages 208-
- Issue 3 Pages 140-
- Issue 2 Pages 74-
- Issue 1 Pages 2-
Volume 42, Issue 6
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Possibilities of Geological Database and Conditions for Mining SimulationToshihide ITO, Makoto OMURA, Takashi NISHIYAMA, Seiya MAEKAWA, Mitsuyo ...2002 Volume 42 Issue 6 Pages 335-341
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSGeological database has become available for mine management because many advanced functions were added with rapid progress in PC hardware performance. In mining management, more careful planning and serious quality control are required because of environmental problem. That is, applying geological database in mining becomes the most important subject to realize both of lower expenses and higher quality. Therefore, using the MineSight that is one of the most popular software, the possibilities of database were examined in case of the Atago lime stone open-pit mine.
Availability of geological database was proven, that is, geologic maps are effective to make mining plan by composing one another. These plans can adjust concentration to realize high quality control and make all mining terms longer. To improve accuracy, it is necessary to master the database operations, because the range value and concentration maps are avairable information for effective boring. Earlier installation is desired. On the other hand, new functions are asked, for instance, mining simulations for quality control under environmental protection, i. e., eyesore and noise prevention.View full abstractDownload PDF (2832K) -
Kouichi SUZUKI2002 Volume 42 Issue 6 Pages 342-350
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSGeophysical exploration is rapidly improving with advancements in computer technology. We can now interpret the outline of a geological structure from the cross sections obtained by geophysical exploration. However, it is still difficult to objectively evaluate hydro-geological and dynamic strength structure from on site cross sections alone. In order to derive hydraulic conductivity from the electrical resistivity of layers, it is necessary to consider the tortuosity of the pore space and eliminate the effects of surface conductivity caused by charged fine particles. We have reviewed empirical equations relating electrical resistivity to hydraulic conductivity based on two idealized electrical conduction models; one for porous media and the other for fractured rock mass. We proposed techniques to calculate hydraulic conductivity from several geophysical logging data; electrical, natural gamma, and neutron logging. This method has been applied to a well where soft sedimentary rocks are distributed. The calculated hydraulic conductivity of fine sandstone, mudstone, and tuff were consistent with those of several core samples at the well. Secondly, the technique for fractured rock mass was tested at a site where the rock mass consisted mainly of granite. Estimated hydraulic conductivity from well logging data was consistent with several spikes of higher hydraulic conductivity detected by temperature logs. In the future, in order to estimate the cross sections of hydraulic conductivity and dynamic strength based on data obtained from resistivity and seismic velocity profiles, we must first reveal the relationship between geophysical data and hydraulic conductivity by laboratory tests using core samples obtained from various layers.View full abstractDownload PDF (1817K) -
Change High-Accuracy Measurement at 2-points to High-density Measurement at Topographic Surface Features ModelYoshiyuki MITO, Masahiko HONDA, Naoya ONO, Tooru FUJII, Hirotaka YASUH ...2002 Volume 42 Issue 6 Pages 351-354
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn these year, we can examine high-density coordinates data of topographic features by 3d-laser-scaning measurement instruments. For Engineering Geology, this new technique makes services more efficient in many respects. For example, more quickly and more safely dating in a time of disaster, at geological investigation and at land-design, lay off a landslide active blocks, we get a detail topographic features model and slice model, and make of 3d-geological condition.
High-density coordinate measurement method at topographic surface features model is put to practical use, then it is necessary to find a use for Engineering Geology.View full abstractDownload PDF (6282K) -
Nobuhiro TSUDA, Takahisa SINJYO, Masamichi IKEDA2002 Volume 42 Issue 6 Pages 365-372
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn maintenance of hydropower station, adequate management of unstable slopes surrounding the hydropower station equipment is one of the important subjects.
It is necessary to correctly grasp the slope condition of the collapse and landslide around the hydropower station equipment, and moreover, it is asked for a quick action from a new collapse, which occurs suddenly.
Although such management of a slope was performed by the inspection check by the engineer engaged in the observation and the everyday maintenance business by the meter etc., in order to perform this efficiently and effectively, the slope management database system, which used Web-browser, was developed.
This system can be used if the software as which Web-browser, PDF, and CAD file are regarded is contained in the personal computer.
The data of each slope consists of a slope chart, photographs, and previous investigation and measurement, aerial photo interpretation result, publication geologic maps of the slope circumference etc., and can be accessed these data now from a map top or a slope table.
Moreover, renewal of data after inspection check shall also be easily performed in the maintenance spot so that the newest information on a slope can always be grasped.
This system uses the Internet technology and enables system development and maintenance at low cost.View full abstractDownload PDF (1524K) -
Daiji TANASE, Eiichiro MOMMA, Hiromitsu ISHII, Takashi ONO2002 Volume 42 Issue 6 Pages 373-379
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn this paper, we will introduce a simple digital camera system which judges degree of rock weathering and displays the results as contour images.
Through color information analyses of digital images of drilled core samples and adit walls combined with physical property tests, β -values: intercepts of regression lines on Green-Red plane obtained by the distribution of color vectors, were revealed to have clear correlative relation to the degrees of weathering and physical properties such as specific gravity and water absorption of the studied samples, and turned out to be suitable for an index of weathering degree.
In the said system we developed, digital images of excavated rock surfaces, such as tunnel face images took by ordinary digital camera are divided into many small analysis masks and β-values of the masks are obtained, then colored contour images of the β-values corresponding to the original digital pictures are drawn up and displayed. As we set up the colors of the contour image reflecting on color information of actual weathered rocks, the achieved contour images became similar to geological sketches and easy to be understood.View full abstractDownload PDF (3239K) -
The Case of the Change of Ground Level at Usu VolcanoKunihiro ISHII, Mitsutomo NAKAMURA, Chiaki INABA, Naomi NAGATA2002 Volume 42 Issue 6 Pages 380-385
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSUp to the present, aerial photography had been widely used for making terrain maps. The Laser Profiler, on the other hand, has been paid attention to, recently. This method is that laser scanner mounted on aircraft irradiates laser pulse in order to scan terrain surface, and measures the distance from ground by calculating the time lag between irradiation of a pulse to the ground and its returning to aircraft. This method enables us to record 3D digital topographical information.
With the laser profiling, we succeeded in getting the topographical information of Usu Volcano, which erupted in March of 2000. Comparing that information with the topographic data taken before its eruption made it possible to calculate the change of ground levels, occurred by its eruption.
It has been confirmed that the laser profiling has remarkable advantages like the followings. Because the data is directly recorded in digital, the process and period for making the data can be less than using aerial photography. And also those data make it easier to proceed GIS analysis.
However, this method is affected by the wooding condition in case of recording the data of ground level, and also has no certain way to know the object shown by recorded data. These remained problems have to be tested and verified from now on.View full abstractDownload PDF (1876K) -
Takashi OKAMOTO, Sumio MATSUURA, Shiho ASANO, Kouji MATSUYAMA2002 Volume 42 Issue 6 Pages 386-393
Published: February 10, 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe Yui landslide-threatended area in Shizuoka Prefecture has some important infrastructure such as an expressway and a railway line. Therefore, long-term maintenance and control of the landside area are required after the construction of landslide countermeasures has been finished. We therefore developed an integrated control method for landslides which utilizes network technology and the Geographical Information System (GIS) which have made rapid progress in recent years.
A central part of this method is an automated observation system which monitors movement of the landslide. The carious equipment of this system is installed in the landslide area and mutually connected by a network. Therefore, the authorities can grasp the latest landslide movement at any time. We introduced the Geographical Information System (GIS) into the automated observation system in order to centralize the enormous amount of data collected by field and construction work for the landslide.
The GIS also provides past information and enables the most suitable route for evacuation to be identified using an extraction and superposition function. This automated observation system started full-fledged operation in the Yui landslide-threatened area in fiscal 2001.View full abstractDownload PDF (3516K) -
2002 Volume 42 Issue 6 Pages 410
Published: 2002
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESS
- |<
- <
- 1
- >
- >|