脆-塑性充填裂隙差异的渗流应力模型

The Differential Seepage-stress Model of Brittle-plastic Filled Fracture

为了研究不同属性介质(脆-塑性)非完全充填裂隙的渗流应力特性,采用花岗岩作为裂隙壁,利用自制渗流应力装置,通过轴向压缩、侧向约束的实验方式,进行了渗流应力实验,得出了相应的渗流应力曲线。结果表明:充填物的脆-塑性变化对裂隙渗流应力特性产生显著影响。脆性充填裂隙渗流应力曲线表现出平衡、失稳和稳定三个阶段;弹塑性充填裂隙表现为失稳和稳定两个阶段;塑性充填裂隙表现出急剧下降一个阶段。根据实验数据的整理与分析,得到差异充填(脆-塑性)裂隙的渗流规律;并建立了相应的数学模型。

In order to study the seepage stress characteristics of cracks with different brittle-plasticity properties,granite was used as the fracture wall,and the seepage stress was tested by the self-made seepage stress device through axial compression and lateral constraint.The corresponding seepage stress curves were obtained.The results show that the brittle to plastic change of the filled materials have significant influence on the seepage-stress characteristics of the fracture.The seepage-stress curves of brittle filled fracture show three stages: equilibrium,instability and stability.The seepage-stress curves of the elastoplastic filled fracture present two stages: instability and stability.The seepage-stress curves of the plastic-filled fracture show a sharp decline stage.Based on the analysis of experimental data,the seepage patterns of the fracture with different brittle-plastic filled were obtained,and the corresponding mathematical models were established.