Shear failure characteristics of cemented interface between filling material and surrounding rock at different curing temperatures
Yang Xiaoliang1,2Wang Wenjie1,2
1. College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; 2. Hubei Key Laboratory
for Efficient Utilization and Agglomeration of Metallurgic Resources, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract：In view of the problem that the high temperature of deep underground mine may affect the shear failure characteristics of the cemented interface between the filling material and surrounding rock, the shear tests were carried out on the cemented interface between the filling material and surrounding rock under the curing temperature of 20℃, 40℃, 60℃ and 80℃ and with normal stress of 0, 0.3 and 0.6MPa. The failure plane is scanned by 3D laser scanning system to obtain the fracture characteristics and parameters of the section. The results show that the temperature and normal stress have obvious influence on the shear strength and failure characteristics of the cemented interface of the filling material and surrounding rock. When the curing temperature increases, the normal stress is constant, the shear strength of the cemented interface increases first and then decreases, and the shear strength is the highest at 40℃; the curing temperature remains the same, and the normal stress increases, the shear strength of the cemented interface increases linearly; the shape characteristic parameters Sp、Sv、Sz、Sa and Sq of the section are inversely proportional to the normal stress. The change trend and strength change when the curing temperature changes. On the contrary, the minimum value is reached at 40℃, while the value of Ssk is not significantly related to the curing temperature and normal stress. The value of Sku increases with the increase of normal stress, and the trend of the change of curing temperature is the same as that of shear strength. The research results can provide a theoretical basis for the strength design of underground filling material and the stability analysis of roof in deep mines.
杨孝亮 王文杰. 不同养护温度下充填体-围岩胶结面剪切破坏特征[J]. 土木工程学报, 2022, 55(4): 76-87.
Yang Xiaoliang Wang Wenjie . Shear failure characteristics of cemented interface between filling material and surrounding rock at different curing temperatures. 土木工程学报, 2022, 55(4): 76-87.
