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以岩体结构控制论为基础 ,把裂隙岩体看作由离散介质和拟连续介质岩体组成的复杂介质岩体。从理论分析和数值模拟两个方面 ,对地下水的渗流场与裂隙岩体的损伤场之间的相互作用机理进行了深入系统的研究 ,具体工作有以下几个方面 :(1)从地质学、岩体力学、统计学的角度出发 ,定量化分析了岩体裂隙的几何特征和裂隙岩体渗透特性 ,为渗流场与损伤场的耦合研究奠定了基础。(2 )基于Betti能量互易定理 ,系统研究了应力场与渗流场共同作用下的岩体损伤演化机制 ,建立了考虑渗透压力的三维含水裂隙岩体脆弹性和弹塑性断裂损伤本构模型和损伤演化方程。研究结果表明 :渗透压力可显著提高裂隙尖端应力强度因子 ,增加岩体的柔度 ,降低岩体强度 ,对裂隙岩体的力学特性具有明显的削弱作用。(3)从岩体裂隙变形角度出发 ,建立了三维应力作用下考虑渗流与变形耦合效应的单裂隙渗流物性方程 ,从理论上推导了拟连续介质岩体渗透张量表达式。基于岩体裂隙的损伤变形 ,提出了裂隙岩体渗透张量演化方程。(4)以岩体结构力学为基础 ,根据裂隙发育规模与工程尺度的关系 ,建立了非稳态裂隙岩体渗流模型。该模型充分体现了主干裂隙在渗流中的强导水作用和网络状裂隙的贮水功能与渗流滞后效应。与以往研究成果相比 ,克服了单纯离?
Based on the rock mass structure control theory, the fractured rock mass is regarded as a complex medium rock mass composed of discrete media and quasi-continuous media rock mass. From the theoretical analysis and numerical simulation, the interaction mechanism between the seepage field of groundwater and the damage field of fractured rock mass is studied systematically. The specific work includes the following aspects: (1) From the aspects of geology, Rock mechanics and statistics, the geometrical characteristics of rock mass fissures and the permeability characteristics of fractured rock mass are quantitatively analyzed, which lays the foundation for the coupling research between seepage field and damage field. (2) Based on Betre’s energy reciprocity theorem, the evolution mechanism of rock mass damage under synergistic effect of stress field and seepage field is systematically studied. The constitutive model of brittle-elastic and elastoplastic fracture damage of rock-mass containing three-dimensional aquifer with considering osmotic pressure and Damage evolution equation. The results show that the infiltration pressure can significantly increase the stress intensity factor of the crack tip, increase the flexibility of the rock mass and reduce the strength of the rock mass, and obviously weaken the mechanical properties of the rock mass. (3) Based on the deformation of rock mass fissures, a three-dimensional physical property equation of seepage and deformation coupling considering single-fracture seepage is established, and the expression of permeability tensor of the quasi-continuous medium rock mass is derived theoretically. Based on the damage deformation of rock mass fissures, the evolution equation of permeability tensor for fractured rock mass is proposed. (4) Based on the mechanics of rock mass structure, a seepage model of unsteady fracture rock mass is established according to the relationship between the scale of fracture development and engineering scale. The model fully reflects the strong water conducting function of the main fractures in the seepage flow and the water storage function and the seepage hysteresis effect of the network fractures. Compared with the previous research results, to overcome the simple from?