- ■日 時 2017/4/4（火） 10：00-11：30
- ■場 所 エコラボ第4講義室
- ■演 題 Monitoring and Reinforcement of Ground Subsidence in Abandoned Mine Area
- ■講演者 Chung-In LEE
Professor Emeritus, Seoul National University
President, Geogeny Consultant Co. Ltd.
Mine hazard means damage to human and environment during mine development. It includes
contaminated mine drainage, mine waste rock, ground subsidence, forest destruction, indirect
soil pollution, and so on. Surface damage due to ground subsidence is inevitable consequence
of underground mining, which can cause sometimes loss of lives and serious property damage.
The surface subsidence in abandoned underground mine area in Korea is observed to be of
different forms from sinkhole to a large scale trough of the ground in the subsided area. For
the prevention of damage, it is very important to predict ground movement.
In this study, case study of surface damage from subsidence, restoration and monitoring and
management of ground subsidence in abandoned mine area in Korea were reviewed. The case
study obtained from a great deal of empirical information was made a comparison of trough and
sinkhole type subsidence in terms of slope of the slide, scope, degree of subsidence, occurrence
speed, period, risk and so on.
In restoration of ground subsidence, the detailed site investigation such as surface geological
mapping, geophysical exploration and drilling, and the detailed design for exact estimation of
the reinforcement method were conducted. Considering the economic and technical condition,
the optimum restoration method is selected and constructed. After that, establish the monitoring
and measuring system for long term stability evaluation. In Korea, grout back filling and roof
reinforcement by micro-pile is most widely adopted.