Investigation on dynamic mechanical behaviors and energy consumption of conglomerate under three-dimensional static stress
The rocks at the bottom of the drilling hole in the huge thick gravel layer in the Kuqa piedmont of the Tarim Oilfield are in a complex load state of impact and in-situ stress., is the main problem restricting the drilling efficiency in this block. Exploring the dynamic load characteristics and energy consumption rules of conglomerate under three-dimensional stress conditions is the key to increasing the speed of rock breaking in the gravel layer. Analysis through the true triaxial Hopkinson pressure bar test The dynamic load strength and deformation characteristics of conglomerate under moderate strain rate were studied to study the influence of dynamic load strain rate on the mechanical properties and energy consumption rules of conglomerate. The results show that the ability of conglomerate to resist deformation under impact load is significantly enhanced with the increase of strain rate., the failure time of the specimen is shortened, the stress growth rate is increased, and the strength and failure strain are increased. The dynamic load damage constitutive model and energy consumption model of rock under three-dimensional stress are constructed, and the dynamic load strength and failure time of rock under medium strain rate are obtained. There is a power function relationship between the energy consumption characteristics and the loading strain rate. The calculation results of this model are in good agreement with the experimental test results of conglomerate, indicating that the established model can accurately describe the dynamic load failure process of conglomerate, thereby providing a good basis for deep gravel layers. Provide reference for research on drilling rock breaking process.