混凝土心墙坝蓄水前后应力位移规律浅析

将较为复杂的三维有限元问题采用二维平面应变问题解决,从而缩小了建模的复杂程度和计算量。同时计算了基于D-P准则的下的坝体有限单元法计算蓄水前后mises应力,心墙的横向和竖向位移及最大最小主应力变化,推导出了在D-P准则下的Drucker-Prager-α及Drucker-Prager-k系数。对拟定尺寸的大坝进行二维有限元计算,结果表明:计算得出的大坝变形规律符合基本规律,蓄水前后沥青混凝土坝心墙横向位移增大,最大竖向位移基本不变,且最大沉降量约为坝高的0.425%,出现位置约在坝高的2/5处;心墙大小主应力按破坏准则计算最大应力水平值小于1,表明心墙在蓄水前后均不会发生破坏。

The two-dimensional plane strain problem is adopted to solve the complicated three-dimensional finite element problem,thus reducing the complexity and calculation of modeling.At the same time,the dam body finite element method based on the d-p criterion was used to calculate the mises stress before and after water storage,the horizontal and vertical displacement of the core wall and the maximum and minimum principal stress changes,and the drucker-prager-beam and drucker-prager-k coefficients under the d-p criterion were deduced.The two-dimensional finite element calculation of the proposed size of the dam shows that the calculated deformation law of the dam conforms to the basic law.The transverse displacement of the asphalt concrete dam core wall increases before and after water storage,and the maximum vertical displacement is basically unchanged.The maximum settlement is about 0.425%of the height of the dam,and the position is about 2/5 of the height of the dam.The main stress of the core wall is calculated according to the failure criterion and the maximum stress level is less than 1,indicating that the core wall will not be damaged before and after water storage.