Engineering geology is a field of engineering sciences that link pure sciences and engineering as engineering furnishes technical basis for practical human livings. Engineering geology has its foundations on geology and on mechanics, or in unified expression on physico-mechanical approach to geology and geological materials. In attempting to select materials for teaching and training in engineering geology, most essential point is to recognize the situation of engineering geology as an engineering science among the pure natural sciences, engineering and practical social livings. Considerations on its situation and an example of undergraduate curriculum are presented in this paper.
In the first part of this paper a variety of failure modes of earthworks in an earthquake are presented, where effects of subsoil conditions are explained. It is emphasized that a consideration for the individual mode is important in hazard assessment. In the second part earthquake faults in Japan are described briefly and the significance of active-fault mapping is discussed in view of the present state of sciences of hazard assessment and earthquake prediction.
The author describes several examples of diagenesis for cenozoic sedimentary clay and failure criteria for sand deposits.Some different characteristics of the various soils, which could not be explained by soil mechanics, are shown and critically reviewed and interpreted by the author from the view point of geological engineering.This paper shown some of the many geological soil or rock problems in engineering which could be handled and solved only through interdisciplinary approach.The author also refers to the education and training for engineers and researchers in geotechnical engineering from the author's experience.
Since several years ago, slope failures caused by heavy rainfall occur at many places in Japan.They damage heavily the inhavitants and the houses. The present paper deals with the results of investigation concerning the geotechnical conditions such as topographical, geological and soil mechanical conditions and the rainfall conditions which give rise to slope failures.These results will be available for the prediction of slope failures in the future.
Little attention has been paid to the type of rock slides and rock falls in landglides. But recently, as many tructures have be built in the mountain area, actual demands, to investigate the characteristics of landslide phenomena have been brought forth. Since occurrence and termination of landslides, seem to follow stochastic process, according to the auther, characteristics of landslides can be expressed by increment number U, decrement ratio K and length of life Z, which depend on the terrestrial conditios. The variation of these constants obtained from three different geological features at certain reservoirs is described, where the Paleozoic sedimentary rocks, volcanic rock and granite are underlain.
The mudstone of Neogene-tertiary time has strong tendency of being effected by creep. The in-situ long time loading tests (24 hours) were conducted by a disk jack to compare with the results of the rapid loading tests. The residual deformation of the former is 10 times that of the latter; the modulus of elasticity decreases with the increasing loading stress by 50% in Maximum. The difference of results in laboratory tests is less than that in in-situ tests. But there is also tendency of decrease in the modulus of elasticity and compression strength.