Abstract
Accidents due to slope failure frequently occur at excavation sites. About 20 workers die annually in accidents attributed to slope failure or rockfall during slope-cutting work in Japan. Lives of the workers and property could be saved if early predictions of failure could be made. Many instruments had been developed to measure the movement of slope just before the failure such as landslide, mainly. But most of them are either difficult to set up in the field or are expensive to opt. By the way of prevention of the labor accidents due to slope failure, it is necessary to develop the system which are utilized for small-to-medium-sized slope-cutting sites. In this report, the development of two-dimensional displacement sensor system for the measurement of early response of failure just before the failure and the application of it are explained.
