高應(yīng)力條件下層狀巖體力學(xué)特性及時效破裂機制研究
[Abstract]:The mechanical properties and aging fracture evolution of layered rock mass are one of the important research topics in rock mechanics field. A large number of examples show that many of the instability and failure of layered rock mass engineering have hysteresis, especially in the environment of high ground stress excavation unloading, it needs a long time to adjust the rock mass stress to achieve a new balance. Sometimes, delay rockburst and large deformation will occur, seriously endangering the construction safety and long-term stability. Therefore, the mechanical properties of layered rock mass under high stress conditions and the evolution law of aging meso-fracture need to be further understood and studied. In view of this, based on the true triaxial test of Danba quartz mica schist, with the aid of three-dimensional particle discrete element theory, the SJ model and super unit clump technique are introduced to construct a meso-mechanical model for layered rock mass. The mechanical properties and aging fracture of layered rock mass under different structural planes, different stress states and stress paths are studied. The main research work of this paper is as follows: 1. Based on the damage rate driven by the exponential meso-stress and the three-dimensional particle discrete element, the PSC model which can describe the aging rupture of the meso-plane and the SJ model which can describe the joint effect are combined. In this paper, a mesomechanical method which can simulate the aging fracture effect of layered rock mass is presented, which can be used to simulate the transient state of rock mass and the structural plane effect of aging fracture. At the same time, based on the theory of three dimensional particle discrete element and seismic moment Zhang Liang, the AE calculation method and spatial location method for simulating the transient and aging rupture of rock mass are presented. Based on the three-dimensional particle flow theory, by introducing SJ model and super unit clump technology, and based on the results of SEM mineral composition detection of quartz mica schist in Danba Hydropower Station, a meso-structure model of layered rock mass based on mineral granulation is established. According to the results of the true triaxial transient compression test and rheological test and the identification method of the meso-mechanical parameters of rock, the transient and aging meso-mechanical parameters of quartz mica schist are determined, and the numerical model of time-dependent mesomechanics of layered rock mass is constructed. Based on the numerical model of time-dependent mesomechanics of layered rock mass, the true triaxial transient mechanical tests of rocks with different joint dip angles were carried out, and the structural plane effect and AE characteristics of transient mechanical characteristics of layered rock mass were studied. The evolution law of deformation and fracture of layered rock mass and the mechanism of mesoscopic evolution are discussed. The results show that the failure mode of layered rock mass changes from rock itself to rock, and then to rock itself, and then to rock itself with the change of slope angle of structural plane, in which, between 45 擄and 75 擄, the failure mode of layered rock is controlled by rock itself. The failure mode of rock is mainly controlled by structural plane. Based on the aging mesomechanical numerical model of layered rock mass, the true triaxial creep numerical tests of rocks with different joint inclination angles were carried out. The structural plane effect and AE characteristics of aging fracture of layered rock mass were studied. This paper discusses the evolution law of aging fracture of rock and the mechanism of meso-evolution. The results show that with the increase of the dip angle of the structural plane, the aging deformation model of layered rock mass changes from attenuated creep to steady-state accelerated creep transformation at about 45 擄of the structural plane inclination, and the smaller the dip angle of the structural plane is in the type of attenuated creep. The larger the convergence rate is, the faster the convergence time is. With the increase of the inclination angle of the structure plane, the convergence time increases gradually, and the convergence rate is smaller. In the accelerated creep type, the failure time of layered rock mass is approximately "U" shape, and the slope angle is about 45 擄. The time of rock mass failure is longer, with the increase of inclination angle, the time of rock mass failure decreases gradually, and the time of rock mass failure increases gradually with the increase of inclination angle, which is the shortest when the inclination angle is about 60 擄.
【學(xué)位授予單位】:長江科學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU45
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