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裂隙岩体在天然地质因素和人工扰动作用下处于加卸载环境是普遍存在的,裂隙面的几何特征和加卸载环境对裂隙渗流特性的影响在实际工程中不可忽视。采用试验和数值模拟相结合的方法,利用热-流-固三场耦合渗流试验系统,开展了应力加卸载作用下不同粗糙度裂隙岩芯试件的渗透试验,自主开发程序将激光扫描裂隙面的三维形貌信息导入到ABAQUS软件,模拟应力作用下的粗糙裂隙渗流。试验和数值模拟一致表明,粗糙裂隙的宽度和渗透率都随载荷的增加而减小,随着载荷的增加,裂隙接触刚度增大,裂隙的宽度和渗透率对载荷变化的敏感性降低;由于点接触产生的塑性变形不可恢复,卸载阶段的裂隙宽度和渗透率增加幅度减小,且小于加载阶段同载荷条件下的宽度和渗透率;裂隙渗透率、宽度与粗糙度呈正相关关系,且粗糙度越大,接触应力分布越不均匀;裂隙内流场符合群岛流,粗糙度越大群岛流现象越明显。
The fractured rock mass is ubiquitous under loading and unloading environment under the influence of natural geological factors and artificial disturbance. The geometric characteristics of the fractured surface and the influence of loading and unloading environment on the seepage characteristics of the fractured rock can not be neglected in practical engineering. By means of the combination of test and numerical simulation, the seepage test system of three-field coupling coupled with heat-flow-solid was used to carry out the seepage test of core specimens with different roughness cracks under stress loading and unloading. The self- The three-dimensional topography information was imported into ABAQUS software to simulate the seepage of rough fractures under stress. The experimental and numerical simulations show that both the width and the permeability of the coarse cracks decrease with the increase of the load. As the load increases, the contact stiffness of the crack increases, and the sensitivity of the width and permeability of the crack to the load changes decreases. The plastic deformation caused by point contact can not be recovered. The width and permeability increase of crack width and permeability in unloading stage are smaller than those in loading stage. The fracture permeability, width and roughness have a positive correlation, and the roughness The greater the degree, the less uniform the contact stress distribution. The flow field in the fracture is in line with the archipelagic island flow, and the greater the roughness is, the more obvious the archipelagic flow phenomenon is.