###### Abstract
[15] conducted compression testing on deep-burried mudstone. The greater the loading rate, the greater the strength of the mudstone rock. [PERSON] [16] performed fracture toughness tests on granite to investigate the fracture mechanism and found that the loading rate increased the fracture toughness. [PERSON] et al. [17] proposed an empirical equation for strain rate associated with a dynamic increase factor. [PERSON] et al. [18; 19] investigated the effect of different joint properties on rock unit stack specimens. In terms of the effect of mixed dynamic and static loading for rock mechanical properties, [PERSON] et al. [20] presented an experimental study of dynamic rock fracture behavior, analyzing how dynamic and static loads affect rock fracture damage and instabilities. [PERSON] et al. [21] performed one-dimensional combined dynamic and static loading tests on composite rock specimens and concluded that the absorption energy of rock samples decreased with the rise in axial compression. [PERSON] et al. [22] observed that the parameters of the samples grew with the growth in dynamic load. [PERSON] et al. [23] performed dynamic loading of water-saturated coal specimens, revealing the deformation and strength characteristics of coal samples. [PERSON] et al. [24] carried out a numerical simulation of Hopkinson pressure bar dynamic and static loading on sandstone. In conclusion, the application of confining pressure and axial compression can inhibit the internal crack propagation of sandstone. [PERSON] et al. [25] found that the dynamic stress-strain curve of rock samples generally has three stages: elastic stage, yield stage, and failure stage. [PERSON] et al. [26] investigated the coal impact test under different dynamic and static combination conditions. [PERSON] et al. [27] analyzed the damage evolution mechanism of rock through deep sandstone dynamic testing and provided a definition of the damage factor. [PERSON] et al. [28] found that the energy absorption value of rock under impact was affected by the gap between the initial energy storage and the energy storage limit. [PERSON] et al. [29] found that there was a good linear growth relationship between the dynamic strength growth factor and the strain rate. [PERSON] et al. [30] noticed that there was a linear growth in the energy absorption density of rocks with varying angles of break with increasing average strain rates in both dynamic and static composite load tests. [PERSON] et al. [31] applied dynamic loading experiments on cylindrical specimens of various aspect ratios. The dynamic peak stress was found to be exponential with the growth in the strain rate. [PERSON] et al. [32] examined energy consumption mechanisms of red rock under a combination of static and dynamic loads. The greater the axial compression, the lower the energy utilization rate. Water also can affect the properties of fissured rocks. When water enters the interior of a rock through a fissure, the particles in the rock move irregularly in the water [33]. [PERSON] et al. [34] conducted dynamic impact compression tests and discovered that the strength of rock reduces with growth in its water content. Many scholars have completed a number of experiments to study the hydrostatic properties of rock at various loading rates. Nevertheless, there are fewer existing investigations on rocks' dynamic mechanical properties under the combined effect of the static and dynamic loading rate. Microfractures within the rock can cause the rock to fracture after stretching and penetrating [35]. Therefore, dynamic compression tests were performed on fractured rocks at different impact pressures using a dynamic-static combination SHPB test set under the dynamic-static combination loading condition, and the dynamic mechanical properties and energy dissipation of the fractured rocks under the dynamic-static combination loading were investigated. This research is also significant for the development and use of underground energy sources [36; 37].