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节理中接触面积的存在使得渗流曲折效应更加明显,将对渗流产生显著影响。为了研究节理接触面积对节理渗流的影响,建立节理渗流概念模型,推导得到了节理渗流的接触面积影响系数;然后在节理渗流计算公式中引入该影响系数,得到了考虑接触面积影响的渗流计算公式。同时,由于接触面积的存在使得渗流曲折因子的计算更为复杂,在获得节理隙宽分布的基础上提出了计算节理渗流曲折因子的五点比较法。然后以人工大理岩节理试件为研究对象,在获得其三维表面形貌的基础上,一方面对其进行不同接触状态下5级法向应力作用下的渗流试验;另一方面,在根据节理试件的三维表面形貌数据计算节理的渗流平均曲折因子和接触面积比的基础上,分别采用考虑接触面积影响的渗流计算公式和Zimmerman计算公式对节理试件在不同法向应力作用下的渗流体积流量进行计算,并将计算结果与实测值进行比较。结果表明:考虑接触面积影响的渗流计算公式计算结果与实测值吻合较好,从而验证了考虑接触面积影响的渗流计算公式的正确性,而Zimmerman计算公式高估了节理的渗流流量。
The existence of contact area in the joint makes the seepage twists and turns more obvious, which will have a significant impact on seepage. In order to study the influence of joint contact area on joint seepage flow, a conceptual model of joint seepage flow is established and the contact area influence coefficient of joint seepage flow is deduced. Then, the influence coefficient is introduced into the calculation formula of seepage seepage, and the seepage formula . At the same time, due to the existence of contact area, the seepage tortuosity factor is more complicated. Based on the obtained joint width distribution, a five-point comparison method is proposed to calculate seepage tortuosity. On the basis of obtaining the three-dimensional surface topography, on the one hand, the artificial marble joint specimens were subjected to the seepage test under five levels of normal stress under different contact conditions. On the other hand, Based on the three-dimensional surface topography data of the specimen and the seepage average tortuosity factor and contact area ratio of the joint, the seepage flow equation and the Zimmerman calculation formula considering the influence of contact area were used respectively to simulate the seepage flow of joints under different normal stresses Volume flow rate calculation, and the calculated results and measured values were compared. The results show that the calculation results of seepage flow considering the influence of contact area are in good agreement with the measured values, which verifies the correctness of the seepage calculation formula considering the influence of contact area. The Zimmerman formula overestimates the seepage flow of joints.