On the caluculation for stability of sericite- schist, pretty and perfectly weatherd rocks were tested. These tests were compression, tension, and shear test. In the shear test for rocks which is able to cut, the angle of schistosity to the direction of vertical stress were varied. By this test c= 2.5kg/cm2 and φ=20°C were obtained, and caluculation was made by following fomula.
Stratum water resources of the representative ground water areas in Tokai district have been studied to compare with each ground water area to make diagram of unit area discharge of ground water after calculation of it. On the further direction of developing the ground water in three prefectures in Tokai district, the following three points will be suggested: (1) Maintenance and re-development of the stratum water sources in plains along the coast. (2) Development of stratum water sources in plio-pleistocene hill areas. (3) Discovery and development of fissure water resources in mountain areas.
Asamushi is a famous coastal spa in the Northeastern provi nces of Japan. Several years ago, the number of ponors was amounted 106 or so in the area. Recently, according to the unreasonable development, the pressure decrease of thermal water and also the intrusion of sea water have occured. The writers studied on the balneogeological character of the “low-thermal water”, which has been enterprised by the ponor combination association to mix with “highthermal water” for the proper cont ribution. The suvey of sub-surface geology, electric prospecting, boring, pumping test etc. were taken place in the area where “the lowthermal water” was presumed to be stored and then the chemical and physical characters of the water, the storage and the geology concerned were studied. Consequently, “the low-thermal water” was considerd to be a kind of underflow whose conduit take a form as like as a valley turning away northeards from the present river course. The chemical charactre of “the low-thermal water” is more or less differnt from “the thermal water”, but its storage is comparatively large, even though the water is rather cold within the upper part of aquifer.
If fluid in mudstone is easily expelled, compaction occurs normally, and a normal or hydrostatic pressure environment exists. The “normal (compaction) trend” appears on the Induction or Sonic log as a continuously decreasing mudstone porosity with depth. On the other hand, if escape of fluid is inhibited, compaction may not occur sufficiently and a high porosity- high fluid pressure situation will result. The abnormal pressures appear in the plot of a mudstone conductivity or transit time vs depth as possitive deviations from the “normal trend”, or as increases in mudstone porosity. Consequently, detecting of abnormal high porosity in mudstones by such logs as the Induction and Sonic can aid to find high pressure zones in the subsurface.
Six argillaceous rocks, six sandstones, two kinds of tuff and two tuffaceous sandstones from various localities in Japan ranging Palaeozoic to Pliocene in age were deformed in the triaxial vessel under 1 to 2500 bars in confining pressure, at room temperature and in strain rate 3.5x10-5/sec. All are dry sample and underwent compression test. The strength of Tertiary argillaceous rocks increases in direct proportion to age. In sandstone the age is important factor for the strength, too. On the other hand, in tuff and tuffaceous sandstone, grain the size seems most important for the strength. As the deformation changes ductile to brittle, the mode of fracturing does wedgelike fracture, singleplane of shear fracture, network of a lots of minute shear fractures, and to flow. The transitional line from the single shear fracture to the network shear fracture occur in lower ductility in both tuff and tuffaceous sandstone, higher in sandstone, and highest in argillaceous rocks.