QUALITY EVALUATION OF DEEP CONGLOMERATE CORE SAMPLES BASED ON LABORATORY TESTS

Abstract

In case of constructing underground structures in deep conglomerate, it is considered that strength and deformation properties of conglomerate core samples are occasionally overestimated because of gravel effect, while the properties are underestimated because of sample disturbance by core sampling. A series of laboratory tests was therefore performed using deep conglomerate core samples and the quality evaluation of the samples was conducted. In this paper, it is presented that the sample disturbance which gives influences to the quality of the samples is complicatedly concerned with gravel fraction content and calcite content. Especially the smaller the calcite content and the gravel fraction content are, the more extensively the sample disturbance is influenced.