小湾拱坝施工过程温度场仿真分析

在ANSYS平台上进行二次开发,建立了一套快速、高效、自动化程度较高的仿真反馈分析系统用于模拟拱坝施工过程温度场.在小湾拱坝施工过程温度场仿真计算中,各测点温度计算值随时间变化的规律与监测值基本一致,吻合情况较好,总体上相差2～3℃以内,计算结果揭示了坝体内部的温度变化规律.研究成果表明:1)1077m高程以下坝体采用的二期冷却方案A使得坝体中出现较大的温度梯度,产生较大的径向拉应力;2)1096m高程以上采用的二期冷却方案B能很好地改善方案A中的不足,较好地控制温度应力,防止拱坝开裂.

Simulation analysis of temperature field in Xiaowan arch dam construction

By developing ANSYS software further,this paper established a fast,efficient and highly automatic simulation feedback analysis system which is used to simulate temperature field in arch dam construction.In simulation calculation of temperature field of Xiaowan arch dam construction,the calculated temperature values which was varied with time was basically the same as the monitored values at different measuring points but differed by 2-3℃ in general.This calculation result revealed the temperature variation in the dam.The research results indicate:1) The applied cooling scheme A for dam body below 1 077 m elevation resulted in great temperature gradient and caused great radial tensile stress.2) The applied cooling scheme B for dam body above 1 096 m elevation greatly improved the deficiency in scheme A and controlled the temperature stress well so as to prevent the dam cracking.