透镜体特征参数对均质土坝浸润线及渗透流量的影响

透镜体的存在对坝体内原有的渗流场具有显著的影响。研究透镜体对坝体渗流场浸润线及渗透流量的影响规律，旨在为库坝设计及其工程建设中进行提高坝体安全性等工作提供理论依据。以不透水地基均质土坝作为研究对象，通过改变透镜体的4种特征参数（渗透系数、相对位置、面积、形状），采用土石坝二向稳定及非稳定渗流计算程序《DQB》分别计算坝体的浸润线及渗透流量。研究结果表明：透镜体的渗透系数、相对位置及其面积对坝体的浸润线及渗透流量的影响显著，而透镜体的形状对渗流场的影响较小。因此，在库坝实际建设工程中，可通过设置适当特征参数的透镜体来改变坝体的渗流场，提高坝体的安全性或蓄水能力。

Effects of lens parameters on phreatic line and seepage flow of the seepage field in homogeneous earth dams

The existence of lens in homogeneous earth dams has great influence on the original seepage field. The effects of lens on the phreatic line and seepage flow of seepage field in the dam body was studied in order to provide technical support for the design and practical engineering construction of homogeneous earth dams, so as to effectively improve dam safety. Taking a homogeneous earth dam with impervious foundation as the research object, by changing four characteristic parameters (permeability coefficient, relative position, area and shape) of the lens, we calculated the phreatic line and seepage flow of the dam body respectively using the two direction stable and unstable seepage calculation program DQB. The results showed that the permeability coefficient, the relative position and the area of the lens had a significant influence on the phreatic line and seepage flow of the dam body, whereas the shape of the lens had little influence on the seepage field. Therefore, setting appropriate values for the characteristic parameters of the lens can change the seepage field of the dam body, which in turn will improve the dam safety or water storage capacity in practical dam construction projects.