For the purpose of judging the safety of existing masonry walls, we applied 6 kinds of methods which we have studied. It was cleared as follows. From these 6 methods, much the same results could get, but incidentally, based on their hypothesis, large variance could happen. Therefor, to get more accurate judgement using studied methods, the corrected soil constants by which checking the results of commonly used soil-slope circular slip surface method should be used. On the other hands, the collection of the field data or the analysis using the computer are expected.
It is said that the keyword of modernization in the north of Kyushu is Chikuhou coal railroad, harbor, and means of transportation in the harbor . Demand and supply of coal of Chikuhou in particular promoted district advance of the center capital and brought advance of Wakamatsu iMoji harbor that was the formation of mainstay railway network to tie up digging of a barge , coal mine shaft and the product departure from a port, the product departure from a port and became base of Japan modernization of the sequel. We gave the summary from a historic viewpoint about the coal mining industry that became base of Japanese modernization and the formation and development of means of transportation.
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