基于光滑有限单元法的土石坝无压渗流场数值模拟

获得自由面准确位置是无压渗流分析中最被关注的问题.采用光滑有限元法对土石坝无压渗流场进行数值模拟,对不同模型的自由面位置进行求解,研究了渗透异常体对自由面和渗流参数的影响.根据梯度光滑技术,建立了无压渗流问题的光滑有限元模型,该方法的优势在于将单元面积分优化为沿单元边界的线积分,简化了边界相交单元的内部积分过程,降低了...

Numerical simulation of unconfined seepage field of earth-rock dams based on smoothed finite element method

In the analysis of unconfined seepage, the key issue is to find the location of the free surface. Here, the smoothed finite element method (S-FEM) was used to calculate the location of the free surface in the saturated seepage region, and to simulate the influence of different permeability anomalies on the free surface and seepage parameters of earth-rock dams. According to the gradient smoothing technique, a smoothed finite element model for the unconfined seepage was established. The advantage of this method is that the element area is divided into line integrals along the boundary of the element, which simplifies the internal integration process of the boundary intersecting elements and reduces the influence of the element deformation on the calculation results. The calculation results of typical rectangular and trapezoid homogeneous dams were then compared with those of other numerical methods, and the effectiveness of the method proposed in this paper was verified. Meanwhile, the influence of different permeability anomalies on the seepage parameters such as water head distribution, seepage velocity and fluid pressure was further studied. These results can provide a theoretical support and feasible strategy for multi field coupling of earth-rock dams, as well as for inversing the location of the permeability anomalies by changing the distribution of seepage parameters.