EXPERIMENTAL STUDY ON TENSILE AND COMPRESSIVE MECHANI-CAL PROPERTIES OF ROCKS FROM DIFFERENT DEPTHS AT A DEEP MINE
The physical and mechanical properties of rocks undergo changes with burial depth.To explore the in-fluence of different burial depths on these properties,surrounding rock cores from both the hanging wall and foot-wall were drilled at a lead-zinc mine in Yunnan,spanning four depths(ranging from 900 to 1200 m).Uniaxial com-pression and Brazilian splitting tests were conducted under varying water content conditions(natural state and satu-rated state).The results indicate that the rock material composition and structure remain similar within the studied depth range.As the rock burial depth increases,the density,p-wave velocity,uniaxial compressive strength,ten-sile strength,and elastic modulus of rock samples show a slight increase,while Poisson's ratio initially increases and then decreases.The water content conditions of the samples significantly impact their mechanical properties.Af-ter water saturation treatment,the compressive strength,tensile strength,and elastic modulus of samples at differ-ent burial depths are notably reduced,and Poisson's ratio experiences a marked increase.The order of water sensi-tivity for each parameter is compressive strength＞elastic modulus＞Poisson's ratio＞tensile strength.This study pro-vides a clear explanation for the variation in tensile and compressive mechanical properties of surrounding rock at different burial depths in deep mines.
Deep miningDeep rock mechanicsEngineering geologyWater content
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