堆石混凝土高拱坝施工期温度应力仿真分析

Simulation Analysis of Temperature Stresses During Construction of RFC High Arch Dam

为研究堆石混凝土高拱坝施工期温度场和应力场的分布特点,并探究堆石混凝土在高拱坝上的适用性,本文运用数值仿真及顺序耦合法,综合考虑堆石混凝土弹模变化、堆石混凝土入仓温度、环境气候变化等因素,对不同温控措施的堆石混凝土高拱坝进行施工期全过程仿真计算。对比分析不同温控措施下高拱坝施工期的温度场和应力场,结果表明:不同温控工况下,坝体温度场和应力场的分布规律基本一致,施工期温度应力与混凝土入仓温度相关,运行期坝体应力随环境气温变化;应力线性化后最大拉应力分别为1.68 MPa、1.60 MPa、1.48 MPa。因此,堆石混凝土运用于高拱坝时,在分缝浇筑的情况下,仅需采取简单温控措施即可满足温度防裂要求。

To study the distribution characteristics of the temperature field and stress field during the construction period of RFC high arch dam and to investigate the applicability of RFC on high arch dam,this paper applies numerical simulation and sequential coupling method,comprehensively considers the change of elastic modulus of RFC,temperature of entry of RFC into the dam,environmental climate change and other factors,and carries out the whole process of simulation and calculation of the construction period of RFC high arch dam under different temperature control measures.Comparative analysis of the temperature and stress fields during the construction period of high arch dams with different temperature control measures shows that under different temperature control conditions,the distribution of the temperature and stress fields of the dam body is the same,the temperature stress during the construction period is related to the concrete entry temperature,and the stress of the dam body during the operation period varies with the ambient temperature;the maximum tensile stresses after linearization of the stresses are 1.68 MPa,1.60 MPa,and 1.48 MPa,respectively.The results show that when RFC is applied to high arch dams,only simple temperature control measures are needed to meet the temperature anti-cracking requirements in the case of split-seam casting.