| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for probing a crack capable of confirming the distribution of opening cracks having a width of several millimeters which become a problem on a rock-bed slope, the continuity of the opening crack, and loosening shape, reducing risks on safety in the work on a steeply slanting rock-bed slope, and measuring under the condition hat there is no underground water on a loose rock-bed slope. SOLUTION: In this method for probing the crack in a rock-bed, smoke, gas heater air, powder, etc., are inserted into an opening crack 12-1 on a surface of a rock-bed 11 an a opening crack 12-2 of a boring hole 13-1 digger on the rock-bed 11 as a tracer, and an appearance position, travel time, density, an out flow amount, and a temperature of the tracer are measured on a surface of the ground or in the other boring hole to evaluate the distribution of opening cracks in the rock-bed, a shape of a loosened rock-bed block, the continuity among specific opening cracks, and a degree of opening of the opening crack quantitatively.</p> |
