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岩体裂隙网络渗流自由面不同于连续介质渗流自由面。自由面问题是渗流区域非线性问题,需要通过迭代求解。很多裂隙渗流是非线性渗流,求解属于渗流本构关系非线性问题,同样需要迭代求解。有渗流自由面的非线性渗流问题属于渗流区域和本构双重非线性问题,必须通过双重迭代求解。分析单裂隙非线性渗流规律,在此基础上利用裂隙水量平衡原理建立结点水头数值方程;参考确定连续介质渗流自由面的固定网格法,对岩体裂隙网络全区域的裂隙渗流参数进行分析,利用裂隙网络渗流传导矩阵调整法确定自由面。通过含自由面岩体裂隙网络非线性渗流问题分析得出:岩体裂隙网络渗流的流态与裂隙网络自身性质、边界条件密切相关;如果存在非线性渗流,也并不是所有的裂隙内的渗流都是非线性渗流,而是线性渗流与非线性渗流并存;裂隙流态对裂隙渗流自由面影响很大,由于自然裂隙的水力坡降大多小于1,最后求得的岩体裂隙网络非线性渗流自由面较同条件下的线性自由面高,总体流量则较线性渗流大。渗流双重非线性问题比单重非线性问题要复杂,用传导矩阵调整法分析含自由面岩体裂隙网络非线性渗流双重非线性问题是切实可行的,而对非线性渗流分析是非常有必要的,渗流双重非线性问题分析必须建立在单重非线性问题分析的基础上。
The seepage free surface of rock fracture network is different from that of continuous medium seepage. The problem of free surface is a non-linear problem in seepage area, which needs to be solved by iteration. Many seepage fractures are non-linear seepage problems. Solving non-linear problems of seepage constitutive relations also needs iterative solution. The problem of nonlinear seepage with seepage free surface belongs to the problem of seepage area and constitutive dual nonlinearity and must be solved by double iteration. The nonlinear seepage law of single fracture is analyzed. Based on this, the numerical equation of junction head is established by the theory of fracture water balance. The fractured seepage parameters of the whole fracture network of rock mass are analyzed with reference to the fixed grid method that determines the seepage free surface of the continuous medium The fractal network seepage conduction matrix is used to determine the free surface. Through the analysis of the nonlinear seepage problem of the free-face rock mass fissure network, it is concluded that the fluid flow in the fissure network is closely related to the nature of the fissure network and the boundary conditions. If there is nonlinear seepage, not all the seepage in the fissure But both of the linear seepage and the nonlinear seepage coexist. The fissure flow has a great influence on the seepage free surface of the fissure. Since the hydraulic slope of the natural fissure is mostly less than 1, the nonlinear seepage of the fissured network finally obtained is free Surface is higher than the linear free surface under the same conditions, the overall flow is larger than the linear seepage. The problem of double seepage nonlinear problems is more complicated than that of single nonlinear ones. It is practicable to analyze the double nonlinear problems of nonlinear seepage in fractured networks with free surface rock mass by conduction matrix adjustment method, which is very necessary for nonlinear seepage analysis The analysis of seepage double nonlinear problems must be based on the analysis of single nonlinear problems.