Experimental Study on Damage Mechanical Characteristics of Heat-Treated Granite under Repeated Impact

Study on Dynamic Characteristics of Deep Siltstone under High Static Stress and Frequent Dynamic Disturbance

“…By analyzing the linear fitting formula of dynamic deformation modulus, it is found that E d has the best fitting effect, and its fitting parameter value is 0.943. It shows that the discreteness of rock deformation modulus can be effectively reduced by using formula (5) to calculate dynamic deformation modulus of rock. At the same time, E 1 , E 2 , and E 3 can only reflect the deformation modulus of the rock, which is the deformation modulus at a certain stage before the peak stress of the dynamic stress-strain curve.…”

“…erefore, the error is large when it is used to measure the dynamic deformation modulus of the rock in the whole stage before the dynamic peak stress. However, the method to determine dynamic deformation modulus of rock in Figure 13 and formula (5) comprehensively considers all stages, which can effectively reflect the deformation characteristics of rock under dynamic impact load in the whole stage. From the above, the method of calculating dynamic deformation modulus of rock in Figure 13 and formula (5) are reasonable.…”

“…Actually, domestic and foreign scholars have made remarkable achievements aimed at the issue with a large number of experimental studies. For example, the SHPB test device was improved by Li et al, and they also used the device to complete the test of static-dynamic coupling loading of the rock under the high strain rate [3][4][5]. is provides the experimental equipment foundation for the research of the dynamic characteristics of deep siltstone under high static stress and frequent dynamic disturbance.…”

Dynamic fracture and energy consumption characteristics of coal-series sandstone after heat treatment

“…Although many scholars have studied the dynamic fracture characteristics of rocks after heat treatment [7], but the research results of the energy dissipation characteristics and the dynamic arrangement characteristics of heat-treated rocks from the perspective of energy theory have rarely been reported. In this paper, the SHPB test system is used to carry out the impact loading tests on coal-series sandstone after heat treatment at 25-800 °C, to clarify the block distribution characteristics, and to shown thatthe energy dissipation characteristics during the destruction process of sandstone are systematically studied to provide reference for deep coal mining and coal underground gasification engineering.…”

“…Yin et al [6] found that the temperature-treated stress-strain curves changed from brittle to viscoelastic with increasing temperature. Wang et al [7] found that the number of micro-cracks and micro-pores in the granite was reduced after treatment at 200 °C.…”