Experimental study on micro-damage of rock mass in sensitive neighborhood under rheological disturbance
The rheological rock mass in the sensitive neighborhood'is prone to deformation and failure under the action of disturbance load.In order to establish the criterion of rheological rock mass entering the sensitive neighborhood from the perspective of micro-damage,the red sandstone is taken as the research object,and the RRTS-IV rock rheological disturbance effect test system is used to carry out rheological disturbance tests on rheological rock mass under different axial static load pressures.The test results show that:(1)When the rheological rock mass is under high axial static load pressure,the longitudinal cumulative disturbance strain curve will experience three stages of deceleration growth,stable growth and rapid growth,and the greater the axial static load pressure,the more prominent the rapid growth stage.(2)By analyzing the relationship between the longitudinal disturbance strain rate and the axial static load pressure,the strain response characteristics of the rheological rock mass under different axial static load pressures for dynamic disturbance are explored,and different disturbance sensitive areas are divided.(3)Under the action of dynamic disturbance,the pore expansion and crack germination of the rheological rock mass in the non-sensitive area will be restrained to a certain extent.(4)When the rheological rock mass enters the weak sensitive area and the strong sensitive area from the transition zone,the dynamic disturbance can greatly promote the initiation of micro-cracks and the expansion of original cracks in the rock mass,and the closer the dynamic disturbance is to the strong sensitive area,the more significant the increase in the number of pores.
rock mechanicsrheological disturbance testlongitudinal strain curvedisturbance strain ratesensitive areapore change
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