Assessment of geotechnical features of Miocene volcaniclastics using integrated logging
- Public Works Research Inst., Ibaraki (Japan)
This paper describes that integrated logging evaluates geotechnical conditions of fractures in Miocene volcaniclastics, where the damsites are for proposed. The purpose of this study was to detect fractures for seepage contols along borehole wall and characterize its geotechnical features by integrated logging. It is First step to evaluate the continuity and permeability of fractures. Integrated logging comprises of caliper, acoustic borehole televiewer, full-wave sonic, temperature, borehole video logging, natural gamma spectrum, and magnetic loggings. Natural gamma spectrum and magnetic logs would characterize litholofacies. Caliper, acoustic borehole televiewer and borehole video loggings would identify the depth, the dip and the azimuth of fractures. Besides temperature logging would determine the groudwater flow and suggest the permeable fracture. Integrated loggings were performed at damsites for proposed in northern Kanto district, middle part of Japan, where Miocene volcaniclastics are widely exposed. In Yunishigawa site, thermal jump was remarkably observed at 84 meters in depth from temperature logging. Its thermal gradient, differentiation of temperature, was 30 {degrees}C/m. The fracture causing it was recognized by the borehole enlargements from caliper logging, and had low slowness of full-wave sonic logging. Integrated logging enabled us to identify the fractures in the order of a dozen centimeters along a borehole wall. The identification would be useful for the geotechnical evaluation. Especially Differentiation of temperature revealed the fracture for seepage controls and classified the fractures into three types, which are (1) the permeable fracture circulating the runoff, (2) the permeable one controlling the groundwater from the deep, (3) the non-permeable fracture. As the first and the second are fractures for the seepage controls, they would involve the geotechnical problems.
- OSTI ID:
- 381514
- Report Number(s):
- CONF-960477-; TRN: 96:004278-0048
- Resource Relation:
- Conference: 9. annual symposium on the application of geophysics to engineering and environmental problems, Denver, CO (United States), 15 Apr - 1 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of SAGEEP `96: Proceedings of the symposium on the application of geophysics to engineering and environmental problems; Bell, R.S.; Cramer, M.H. [comps.]; PB: 1353 p.
- Country of Publication:
- United States
- Language:
- English
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