关键词: 动静组合载荷, 渗透水压, 单轴循环载荷, 深部岩体

Abstract: In this paper, to reveal the mechanical response of deep rock under the coupled action of ground stress and seepage water pressure when facing dynamic disturbance such as blasting, the seepage pressure loading device was developed, and the uniaxial cyclic loading tests of prestress fractured concrete samples, coupling with and without seepage water pressure, were carried out respectively. The results show that the limited uniaxial cyclic loading is helpful to the strengthening of concrete material when it is in the elastic stage. Under the action of seepage water pressure, the rock strength is reduced after the uniaxial cyclic loading, while the reduction degree is related to the prestress of cyclic loading. Meanwhile, when the cyclic loading is compressed in the elastic stage, the rock strength is higher than that when cyclic loading is compressed in the damage stage. In addition, the rock strain under the action of seepage water pressure is greater than that without seepage water pressure. Therefore, the burst proneness of rock mass can be reduced by the action of cyclic loading and unloading, and the low seepage water pressure can further decrease the rock burst proneness.

Key words: coupling of static and dynamic loading, seepage water pressure, uniaxial cyclic loading, deep rock mass