Experimental Study on Heat Transfer Law of Rock Under Transient High-Temperature Thermal Shock
To explore the internal heat transfer law and thermal stress distribution law of rock under transient high-temperature thermal shock,the transient high-temperature thermal shock test under high-temperature oil bath condition was carried out on granite,limestone and sandstone,and the temperature and temperature gradient distribution in rock at different time were measured.The results show that the temperature change process in the rock under transient high-temperature thermal shock is divided into three stages:rapid temperature rise,slow temperature rise and temperature stability.The temperature gradient change shows a process of rapid increase and then slow decrease to 0.Due to the influence of fluid penetration,the overall thermal conductivity of sandstone with large porosity during thermal shock is increased by more than 26％compared with that at room temperature in air.The temperature field and temperature gradient field of different kinds of rocks have similar distribution and evolution law.The temperature field is distributed in capsule shape,and the temperature gradient field is distributed in strip shape.The peak value of thermal stress in the rock under transient high-temperature thermal shock occurs at about 100 s(in the rapid heating stage).At this time,the rock is more prone to thermal damage,and the damage area is concentrated in the banded range near the sample boundary.
万方数据
维普
