碾压混凝土坝温度场与应力场全过程仿真分析

 根据碾压混凝土坝的施工特点，基于有限单元法， 对彭水水电站碾压混凝土重力坝溢流坝段的施工期和运行期（共长达2 001 d）的温度场、 应力场进行全过程仿真计算。温度场计算考虑了逐日气温变化、混凝土的水化热以及入仓温 度、库水等对坝体温度的影响；应力场计算考虑了自重、静水压力、温度荷载、混凝土徐变 、随龄期而变化的混凝土弹性模量等因素，对施工过程中渡汛泄洪冷却、施工入仓温度、寒 潮袭击等多种工况进行了分析，提出了合理的施工程序及温控措施。仿真结果表明，环境温 度、入仓温度对碾压混凝土坝的最高温升、温度场及应力场分布有着明显的影响。

Entire Process Simulation of Temperature and Stress Fields for RCC Dams

Using the finite element method,a simulation procedure is developed for analysis of temperature and stress fields of rolled compacted concrete(RCC) dams based on the construction characteristics of RCC dam.The procedure is then applied to analyze the temperature and stress histories of the Pengshui RCC Gravity Dam for the entire process of construction and operation period of the project.Environmental temperatures changed by atmosphere and reservoir,temperature rised by cement hydration heat and concrete placing temperature are considered in the simulation.Also,the gravity load,the static water pressure,creep effect of the concrete and the variation of Young' modulus due to the age are included in the computation of stress field.Different factors are also considered in the study including cooling due to construction flood overflow,cold wave attack etc.The conclusions show the surrounding temperature and the placing temperature have significant effects on the temperature and stress fields of the RCC dam.Reasonable construction and temperature control measures are suggested from the results of the study.