覆盖层对平原水库坝下放水涵洞性态影响分析OA

The operational status of culverts beneath dams significantly affects the functioning of reservoirs.The presence of overburden layers increases the uncertainty of culvert performance,making it essential to study their structural safety in this context.Using the overburden drilling and reservoir design data,a finite element simulation was employed to analyze the stress and deformation distribution of the culvert structure under varying overburden thicknesses.Results demonstrate that as the overburden thickness increases,the maximum settlement of the dam body and the culvert shift upstream,creating an inverted slope in the culvert.The compressive stress in the culvert increases,while the tensile stress decreases.The slope ratio of the culvert and the deformation of the culvert joints both increase.Shear deformation in the high plasticity clay zone remains relatively unchanged across different overburden thicknesses.The settlement deformation difference of the culvert before and after cushion layer replacement decreases with increasing overburden thickness.This study indicates that within a certain range,an increase in overburden thickness can adversely affect the water conveyance performance of culverts beneath dams and elevate the risk of seepage.This thickness range is correlated with the properties of the overburden soil,potentially reaching several hundred meters.It is recommended to thoroughly consider the impact of thick overburden on culverts during the design phase,particularly by analyzing and controlling the maximum displacement of culverts under various operating conditions.Additionally,measures such as reinforcing joint structures should be implemented.