Abstract

In this article, the authors present the outcomes of their studies on the dynamic characteristics of ground and amplification of ground motions above abandoned mines and discuss their implications. In addition to the effects of some parameters associated with extraction, some topographic effects on ground motions in areas with abandoned mines are also investigated and results are presented. It will be clearly shown that ground amplifications may be quite large on the abandoned mines where extraction is carried out by room and pillar technique or open-pit mines. The ground amplifications may be 3–5 times that at the base. Particularly these amplifications may be quite large particularly near steep cliffs.

1 Introduction

There are many abandoned mines in various parts of Japan and the recent earthquakes showed these mines are quite vulnerable to cause sinkholes and subsidence (Aydan & Tano 2012a,b). Therefore, there is a growing concern on the safety of areas above such abandoned mines in relation to the anticipated Nankai-Tonankai- Tokai earthquake. Unfortunately, the present seismic risk assessment of Japan does not consider the effect of abandoned mines on ground motions in such areas. The authors have been carrying out researches on the short and long-term stability of ground above these abandoned mines.

There are almost no studies on the dynamic characteristics of ground and amplification of ground motions induced by earthquakes above abandoned mines exploited by room and pillar technique as well as long-wall mining techniques except those by the authors. In this article, the authors present the outcomes of their studies on the dynamic characteristics of ground and amplification of ground motions above abandoned mines and discuss their implications. In addition to the effects of some parameters associated with extraction, some topographic effects on ground motions in areas with abandoned mines are also investigated and results are presented.

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