中文摘要：

根据室内模拟试验，研究了水流流经L形裂隙时水头损失随裂隙宽度、裂隙中水流流速变化的规律。研究结果表明：水流流经L形裂隙的水头损失随隙宽的增大而增大，与水流流速之间呈二次函数关系；综合分析不同隙宽条件下L形裂隙水头损失与流速之间的二次函数关系，显示此函数关系的二次项系数与隙宽之间呈线性关系，一次项系数与隙宽之间呈二次方关系，最终得到L形裂隙水头损失与隙宽及流速之间的经验公式。

英文摘要：

Laboratory simulation was conducted to study the water flow in L-shaped fractures with different aperture widths and flow velocities. The results show that the water head loss of L-shaped fractures increased with the increase of the aperture width, and the water head loss can be approximated by a quadratic function of the flow velocity. There was a linear relationship between the quadratic coefficient and the aperture width and a quadratic relationship between the monomial coefficient and the aperture width. Finally, an empirical function of the water head loss, the flow velocity, and the aperture width was obtained.