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- 검색키워드
- 학과정보 : 地球環境科學科應用地質學專攻 (검색결과 24 건)
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The study on the 13 villages where many residents have enjoyed longevity shows that geologic and living environments have more influence on human's long life than some genetic factors. The areas for this study are mainly composed of old granite gneiss. They are composed of intermediate rock growps, sedimentary rock, granite, basalt, and tuff in orders, even if these are smaller in distribution size than old granite gneiss. The alluvium, in particular, is a mixture of sand, gravel and rock. The villages are mainly located in front of mountains and behind stream and rivers. Their topography are high in elevation for northern aspects and low in elevation for southern aspects, or high in elevation for southern aspects and low in elevation for northern aspects, or high in elevation for western aspects and low in elevation for eastern aspects The PH of ground water in the public wells used for long periods ranges between weak acid and weak alkalinity. The average PH level of ground water is 6.73 (neutral range). The PH level of ground water in 22 other areas which are randomly selected excluding the areas for this study ranges between neutral and weak alkalinity. The average PH level is 7.7(weak alkalinity range). Although many studies show that water of alkalinity is beneficial to health, this study result surprizingly doesn't match them. The villages are mainly located at well-drained area with higher elevation, some at seasides, or at riverside. The residents rely on the produce growing at their living areas as their main food source. Their main foods are soy bean paste soups and garlic of which caloric level is low, examined by the medical specialists. Although the residents have lived poorly depending barren agricultural land, they have lived positively and have been friendly with their neighbours. They are accustomed to living mood of respecting the elders especially. They have worked very diligently all day long. The whole areas have no environmental pollution. There are no humus soils by organic decomposition in the areas due to good draining. Despite the poorly living condition, the traditionally comfortable surroundings allowed the residents to enjoy longevity. Recently, however, this aptitude been changed. As many surveyors and tourists have visited the areas which mass media report interestingly, outer different culture has penetrated into their living mode and has often had conflict with their own one. After all, their traditional value has gradually been disrupted by the outer culture of material civilization. Recently, some healthy elders are sometimes reported to have died suddenly in the areas. It is presumed that this happened as the refusal to material civilization has destructed their existing spiritual culture and has broken their life rhythms. The comfortable and beautiful landscape of mountain valleys, riversides and seashores is valuable in itself and further helps the residents to have accumulate generous and friendly tempers with physical and mental stability, which is base of the attitude of respecting the elders especially. They have learned to cooperate with their neighbours to increase productivity at the poor agricultural land. They have also worked diligently and could continue to lead their house-hold economy of self support and sufficiency. As the soils of the long life villages are thin and composed of gravel and rock, they harvested the crops such as millet, beans, maize, potato, radish, garlic, and red pepper which grow better in the well drained agricultural lands than in the soils with high specific retention. These crops became the only food sources which provided the residents with basic nutritions. As many study results of international conference and a lot of treatises verify that beans and maize contain many quantities of constituents useful to health, this study for the 13 long-life villages also shows the beans and maize became major cause of longevity of their residents.
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The area under investigation for the past ten years is located in the vicinity of the Imha dam. The area is excavated for construction of new road in 1989. Differential heave in one part of the area is occurred, and differential subsidence and cracking in another part are taken place because of the road construction. The study area is the upper part of Gyeongsang System Donghwachi Formation and consists of pebbly sandstone, sandstone, shale and mudstone. Two faults are found in the study area. Geotechnical and surveying techniques used to be used not to solve the problem of the mechanism of the failure processes but to analyze the slope instability in the past. Geophysical methods(electrical resistivity method and seismic prospecting method) were applied in order to identify underground geology and geological structures. The interpretation of these slope failure studies is not a straightforward analysis, and the general conclusion is that the complexity of a slope failure requires a complex investigative approach using a combination of different geophysical methods and geotechnical methods. The Geological surveying of surface, boring, trench and geophysical prospecting were performed to grasp the geological structure characterics, and the investigation of precipitation, hydrosphere and property of clay and rock was performed in the laboratory. As a result, it was identified that the bedding plane and clay layer were almost parallel, and the bedding plane of the road sides slope to the fault plane. The clay was identified that has relatively big volume expansion by swelling test of clay. It is considered that the sliding of slope is caused by decrease of shear strength of week zone with clay. The heave of road is also an appearance that brings about the sliding of slope occurred on the surface caused by NNE vertical fault.
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대심도 환경 봉압하 단일불연속면에서의 투수특성에 대한 연구
Recently, many researchers have actively performed studies regarding underground radioactive waste repository isolation. The purpose of this study was to provide basic data for the underground radioactive waste repository isolation. In order to accomplish this purpose, we investigated the permeability characteristics in the single discontinuity under the deep depth environment. We produced 9 specimens from the coarse-grained, medium-grained and fine-grained granite (3 specimens from each type of granite). We used the core of NX-size for the specimens. We made a single discontinuity in the specimens through Brazilian test after constructing the wedge-type connecting device. We performed a permeability test by applying the confining pressure of 10Mpa, 15Mpa, and 20Mpa, which are equivalent to the pressure of underground at the deep depth environment. We measured JRC values for each type of grained degree using Profile gauge and calculated the hydraulic aperture. The results showed that the permeability coefficient and the hydraulic aperture were decreased with the increase in the confining pressure. JRC (Joint Roughness Coefficient) value was increased with the increase in the grain-size.
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압밀그라우팅에 의한 불연속성암반의 개량효과에 관한 연구
This thesis deals with the consolidation grouting effects ; improvement of deformation and permeability after consolidation grouting in fracture zones. In tunnels, and underground excavations in rock mass, failures are frequently controled by the presence of discontinuities such as faults, shear zones, bedding planes and joints. Mechanical behavior and permeability of rock mass appears different pattern according to presence of discontinuities, in fact, deformation and strength of rock mass is dominated by their discontinuities. Rock mass deformation appears due to the synthetic effects of rocks and joints deformations. Rock and rock mass properties are measured by engineer in construction site, and many improvement methods of rock mass are applied in situ. Grouting is general method for improving rock mass, as filling grout in discontinuities. Using Lugeon test and Elastometer test, physical and mechanical properties of rock mass are measured. Study area is classified two sections, called Area 1, and Area 2. The former(Area 1) consisting of dacitic pyroclastic rock is located 8338~8354m away from the tunnel entrance, and the later(area 2) consisting of quartz monzonite is located 1369~1390m away from the tunnel entrance. In Area 1, total number of drill holes is 124. Number of drill holes for consolidation grouting is 48, 1st certifying holes are 42, and 2nd certifying holes are 34. As a result, grouting took total 3042.07kg cement. Lu value decreased by about 2.44%, outflow decreased by about 65.27%, natural water pressure increased by about 106.54%. In Area 2, total number of drill holes is 48. After consolidation grouting, improve ratio for modulus of average deformation is about 2.30 and modulus of average elasticity is about 2.49.
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