科研之友
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摘要
Aiming at the problem of deformation and stability about rock mass, with underground powerhouse caverns of a hydropower station hosted in basalt rock mass as background, taking three chambers(the generator chamber, the main transformer chamber and the tail water surge chamber) as objects of study, based on monitoring results during construction, surrounding rock mass deformation magnitude distribution and spatial distribution in underground powerhouse chambers are analysed firstly, then by means of geological information combining with excavation and construction progress, the law of in-depth and by-time are analysed, at last the deformation characteristics of basalt rock mass during construction are summarized, and the effect of the inner beddings of the basalt on surrounding rock displacement is analyzed at mean time. The research results show that, with structural surface enriched, but mosaic structure in basaltic, effects of structural surface on surrounding rock mass deformation are not obvious. Most parts of surrounding rock displacements are within 20 mm, and within the scope of 15 m depth the rock mass displacement presents flexibility state, and deformation developed continuity with depth, such kind of rock mass can be considered as a homogeneous medium. Construction is the main factor that affects the development of deformation, and along with excavation carried out, the surrounding rock displacement shows developing trend like step.
