Abstract
One of methods to evaluate stability of ground around tunnel is observation of qualitative character of its cutting face in under-construction, but evaluation for the method may be varied by the observer, so it is hard to design suitably at present. Therefore, we performed in-situ test by simple tester (ex. seismic prospecting at cutting face) to examine whether the tester, which can represent quantitative character of the ground, can use as index to evaluate the ground. And we examined the relation between the observation record of cutting face and its stability or ground deformation, and studied which items is useful to evaluate the ground.
