Stability karst cave Heetei to dynamic impacts during blasting development Ust'-Borzinsky limestone deposits in East Transbaikalia

Abstract

The article devotes to investigations the caves Heetey - natural monument Trans-Baikal Territory, in connection with the problem of their preservation during the blasting development of the nearby located Ust'-Borzinsky limestone deposits. Limestone processing is planned to open by a career with 5 ledges height of 15 m each. The characteristics of natural conditions, geological, and hydrogeological properties of permafrost enclosing rock massif, provides information about the shape, location and characteristics of ice cover, which affects on the dynamic stability of the cave and its elements. The analysis of the results of experimental studies of dynamic stability of karst cave Heetey to the effects of explosions in the development of the open method of Ust'-Borzinsky limestone deposits is presented. The main purpose of engineering and seismic measurements of vibrations of the rock mass enclosing Heetey cave was to study the amplitude and frequency content of vibrations to assess the seismic effect of explosions carried out in the near quarry with limestone mining. Actual measurements of the parameters of the rocks fluctuations in the cave Heetey included varying the total weight of the impact of charges, the distance from the source of vibrations to the registration points, the difference in the parameters of group explosions on the amplitude-frequency characteristics of wave propagation in a cave in the enclosing rock mass. The analysis of the results of field measurements of cave rock vibrations and calculations, of their dynamic stability taking into account the effect of the array of bottom cover of ice, filling with water of the cave and shielding devices is cited. Particular attention is paid to the effect of empty and filled with ice holes in the rock mass in the propagation of mechanical vibrations in it. Presented findings of scientific and applied pattern.