严寒地区某碾压混凝土重力坝温度应力仿真分析

Simulation Analysis of Thermal Stress on RCC Gravity Dam in Cold Region

根据工程浇筑计划及温控措施,以东北地区某碾压混凝土重力坝挡水坝段为研究对象,基于温度场和应力场三维有限元分析,对大坝整个混凝土施工期及运行期进行仿真计算。分析得出基础约束区和中部的坝体温度应力基本在混凝土允许拉应力以内,坝顶处温度应力偏高,超出允许拉应力控制标准;建议施工过程中做好越冬面的保温措施,坝顶应力偏高区域采用钢纤维混凝土,增加材料抗拉、抗冻等性能,以防止坝体出现裂缝。研究结果可为类似严寒地区碾压混凝土重力坝设计和施工提供参考借鉴。

According to concreting program and temperature control measures,taking a RCC gravity dam in northeast China as the re-search object,the whole periodduring concrete construction and operation of dam was studied based on the three-dimensional finite el-ement analysis of temperature field and stress field.Results show that thermal stress of foundation restraints and dam in central within the allowable stress,and dam crest has high thermal stress that beyond allowable stress.It suggests that winter surface should take some insulation measures in the construction process,and dam crest should use the steel fiber reinforced concrete,increasing the material tensile strength and freezing and thawing durability in order to avoid cracks in the dam.This research can be reference for the similar RCC gravity dam design and construction in cold region.