采用三维线弹性有限元法 ,研究了小浪底水利枢纽孔板洞中闸室段在内压和外压作用下围岩、衬砌混凝土的应力和变位。通过对比分析 ,找出了结构设计的控制条件 ,并对通气孔的存在给结构带来的影响和中闸室的整体稳定等问题作出了评价 The stress and displacement of surrounding rock and lining concrete under the action of internal pressure and external pressure were studied by using the three-dimensional linear elastic finite element method in the chamber segment of the orifice of Xiaolangdi Hydro Project. Through the comparative analysis, the control conditions of the structure design were found, and the influence of the existence of the ventilation holes on the structure and the overall stability of the middle sluice chamber were evaluated