Rock fall monitoring has been in general conducted by measuring a tension of protection wire or a tilting of protection post installed at rock slopes. Conventional equipments require repairs of the wire or the post after rock fall events since falling rocks give damage to the equipment. To overcome this fault, a new system for rock fall monitoring using photoelectric sensors was developed in this study. This technique allows the system to be functioned during long duration without repairs since the sensors can detect rock fall without any contact with rock fragments and are not damaged ever. Reliability of this system was checked out through various tests both in a laboratory and a field. The test results showed that the system was effectively applicable to detecting rock fall events and useful for gathering and analyzing various technical data. It is also capable for roughly estimating the size or moving direction of rocks through comparing digital images captured by a camera.

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