Abstract
Unstable zones of underground caverns and rock slopes would be required to be monitored. Thus, a safe measuring method at distance has been necessary by eliminating to place devices or targets at the measuring points.
Here, a new monitoring method is introduced for underground chambers. The principle is that coordinates of a laser spot projected from one angle is calculated by using a triangle in a space formed by taking the image from the other angle. Then, many measuring points can be monitored by repeating the principle step by step. A test result concerning on the accuracy shows the capability in underground chambers. It is hoped that the study on the behaviors of rock mass failures would be propelled by using this method.
