Historic subsurface dimension stone quarry and the stability of its galleries as a function of pillar width and thickness of cover bed

Abstract There are historic subsurface dimension stones in the capital of Hungary (Budapest) that were excavated porous limestone. The stability these openings is important, since most them located urban areas, where existing buildings or new structures planned to be built. paper presents a detailed study considering geometry system and mechanical parameters cellar was obtained using terrestrial laser scanning (TLS). cover beds few meters thickness, width pillar between 2.50 3.98 m, according measurements. rock mass which used calculations from laboratory tests. A finite element (FEM) software Rocscience (RS2) applied model galleries. Calculations made for various geometries taking into account thickness pillars. Altogether 70 models made. surface load 150 kN/m 2 also buildings. New relationships bed displacements outlined compare results previous works. strength reduction factor calculated all geometries, indicating changes underground quarries pointing out importance geometries.