中文摘要：

为了改进拱坝传力洞的设计方法,寻求传力洞设计的理论依据,提出了传力洞的预期压缩变形量与拱坝的拱端位移相一致的设计原则.将围岩对传力洞的影响简化为抗力作用,并利用最小势能原理,导出求解传力洞截面尺寸的理论公式.结果表明：传力洞顶端推力与洞顶位移之间的关系表现为线性,该线性关系的斜率表达式中包含有传力洞的面积变量;据此关系式,可以求出传力洞的截面积.

英文摘要：

For improving the design methods for concrete plugs of arch dams and seeking for the theoretical basis for their design,a design discipline was proposed,that is,the displacement of the dam abutment should be equal to the compression of the concrete plugs.The influences of the surrounding rock on the concrete plugs were simplified to the action of resistance,and the formulas to solve the sectional size of the concrete plugs were derived according to the principles of the minimum potential energy.The results show that the relationship between the thrust and the displacement on the top of the concrete plugs is linear,and the sectional area of the concrete plugs is included in the gradient of the relationship.By use of the relationship,the sectional area of the concrete plugs can be obtained.