论文部分内容阅读
采用花岗岩作为裂隙壁,脆-塑性材料(砂岩、不同配比水泥砂浆、橡皮和陶泥)为充填介质,利用自制渗流应力装置,在侧限约束条件下,开展了脆-塑性充填裂隙的渗流应力特性实验。研究结果表明,充填物脆-塑性的变化对裂隙渗流应力特性产生显著影响。对于脆性充填裂隙,加载初期,高流量较长时间保持稳定,当应力增大到充填介质的峰值应力后,渗流量呈现近直角突降,随着应力继续增大,流量缓慢下降并最终保持较低水平。随应力逐渐增大,弹塑性充填裂隙初始段高流量持续较短,随后迅速降低直至最低水平。塑性充填裂隙渗流量持续快速降低至较低水平,基本未见高流量持续现象。最后,根据脆-塑性充填裂隙渗流应力的典型特点,建立了脆-塑性充填裂隙渗流应力特性的数学模型和概化模型。
Using the granite as the fissure wall, the brittle-plastic material (sandstone, cement mortar with different proportions, eraser and clay) as the filling medium, the percolation of the brittle-plastic fissure is carried out under confined confinement conditions by using self-made seepage flow stress device Stress characteristics experiment. The results show that the change of brittleness and ductility of filling material has a significant effect on the seepage stress characteristics of fractures. For brittle-filled fractures, the initial flow and the high flow remain stable for a long time. When the stress increases to the peak stress of the filling medium, the seepage flow presents a sharp dip at near right angles. As the stress continues to increase, the flow rate decreases slowly and remains relatively Low level. With the gradual increase of the stress, the high flow in the initial section of the elasto-plastic filling fissure lasts shorter and then rapidly decreases to the lowest level. Permeability of plastic-filled fractures continued to decrease rapidly to a relatively low level, with no sustained high flow. Finally, according to the typical characteristics of percolation stress in brittle-plastic filled fractures, the mathematical model and generalized model of percolation stress in brittle-plastic filled fractures are established.