発破振動により生ずる落石の監視

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The relationship between rockfall and vibration of the ground has never been fully analyzed before in Japan because of several problems which fall within one of two categories which we have labelled"motive cause"and"primary cause"Problems falling within the"motive cause" category are concerned with characteristics of vibration while those problems falling within the"primary cause"category are concerned with the conditions of mountain slopes (e. g. morphometric parameters of slope; quality of weathered materials and surface soil). In spite of these problems, it is quite important to analyze the relationship between rockfall and vibration of the ground for some kinds of construction works such as railway and tunnel construction because shocks of the ground for some kinds of construction works such as railway and tunnel construction because shocks from blasting may cause rockfalls. In our survey, two seismic tests were carried out-one involving a dynamite blast and other involving a shockwave caused by a passing train. The results of these tests can be summarized as follows: 1. The shock that was produced by the passing train did not cause a severe rockfalls. The maximum deformation of the ground was 7.6×10^<-5> cm and occurred above 10 seconds. These results are too small to cause a rockfall. 2. The relationship among the amount of dynamite, the maximum displacement, the maximum accelaration and the transmissive velocity of vibration was studied to find the point at which a severe rockfall was likely to occur during tunnelling work. In this test, 3kg of dynamite were exploded 50 meters from the test site. As a result, the maximum displacement was 1.4×10^<-3> cm. This value is also too small to cause a rockfall.
一般社団法人日本応用地質学会の論文
1981-09-30

発破振動により生ずる落石の監視

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