... powerhouse cavern calculation mica schist Upstream Oil & Gas horizontal stress situ stress stress field topography rock mass time dependent effect numerical model stress measurement vertical stress Stress measurements for underground powerhouses three recent cases L. Lamas1, M. Espada1...

... the parting as a medium- to high-strength rock. However, water and the anisotropic nature of the parting were found to significantly affect its strength. High horizontal stresses associated with the mining method may be of great concern with respect to roof failures in areas where they are concentrated...