Study On The Test System And Strength Limit Neighborhood Range Of Rock Creep Disturbance Effect

Deep coal resource mining is faced with the problems of high ground stress and strong disturbance.Research on the creep disturbance effect of rock is the key to solve the problem.For the further study of the related problems of “ strength limit neighborhood”of rock creep disturbance effect,the RRTS-IV type rock creep disturbance effect test system is developed according to the shortage of existing test system and the actual demand of rock creep disturbance effect test.Based on the new test system,the uniaxial compression test of rock creep disturbance effect is first carried out,and then the triaxial compression test of rock creep disturbance effect is carried out on the basis of uniaxial test.The results show that:(1)The RRTS-IV rock creep disturbance effect test system can provide long-term and stable axial pressure to meet the test requirements;effectively reduce the random reciprocating oscillation time of impact weights,and provide convenient conditions for obtaining more accurate test data and analysis;can achieve low-grade continuous and slow step-by-step loading function to ensure the smooth conduct of the test;the test system is easy to operate,reliable performance,suitable for rock creep disturbance effect related test research.(2)Under the condition of single and triaxial compression,relative instantaneous disturbance deformation,it is more appropriate to determine the range of "strength limit neighborhood" by the law of residual disturbance deformation transformation.And the corresponding "strength limit neighborhood" range is obtained.(3)Under the condition of uniaxial compression,defining the range of "strength limit neighborhood" with long-term strength still has high reference value.Under the condition of triaxial compression,the long-term strength of rock increases gradually with the increase of confining pressure,and it is still of higher reference value to determine the "strength limit neighborhood" range of rock with long-term strength under the condition of higher confining pressure.Under the condition of the same disturbance,the threshold of the limit neighborhood of strength increases with the increase of confining pressure.The research results of this paper optimize the test system of rock creep disturbance effect,enrich the theoretical system of "rock creep disturbance effect ",and provide the basis for subsequent related research.This paper has 59 pictures 8 tables and 68 references.