MODEL TEST STUDY OF DEEP-HOLE INDUCED CAVING IN MINING ENVIRONMENT REGENERATION
开采环境再造深孔诱导崩落模型试验研究

Based on the prototype of the Kalatongke Copper-nickel Mine in Chian's Xinjiang Autonomous Region,the geological mechanics modeling test is made to deeply analyze the artificial roof,upper and lower surrounding rock evolution rules of mechanical induced by deep-hole induced caving excavation. The model test in the simulation test system of rocks excavation under bidirectional loading is carried out. The process of mining environment regeneration with deep-hole induced caving and filling in 8 excavation steps is simulated. The test results show that:(1) when #1 and #2 drilling chamber and under drilling driftway are excavated,the stress and deformation of upper and lower surrounding rocks increase slowly,but the stress of middle part of artificial roof gradually decreases,it is in tension. When the V-shaped trench are excavated,the stresses of upper and lower surrounding rock increase quickly. The stress of upper surrounding rocks bottom,lower surrounding rocks bottom and left part of artificial roof reaches 2.2,2.14 and 2.53 times of the in-situ stress,respectively. Stress concentrates in these parts;(2) After the final excavation,the maximum subsidence of upper and lower surrounding rocks and artificial roof reaches 6.5,2.8 and 8.6 cm respectively,which can meet the requirements of mine safety. The upper surrounding rock has the phenomenon of whole deformation;(3) The 9 m thickness of artificial roof does not break during the whole model test,it achieves the mining environment regeneration,and ensures the safety and stability of the whole test stope.