腊寨水电站混凝土重力坝运行期应力分布仿真计算

发布时间：2018-06-02 11:10

本文选题：混凝土重力坝 + 腊寨水电站　；参考：《排灌机械工程学报》2017年07期

【摘要】：为了研究重力坝运行期各工况应力分布情况,以腊寨水电站混凝土重力坝为研究对象,通过非线性弹塑性有限元法进行重力坝运行期各工况应力分布仿真计算,同时采用《混凝土重力坝设计规范》(NB/T 35026—2014)计算并与有限元计算结果进行对比分析.结果表明各静态工况中,最大拉应力和压应力均发生在溢流表孔坝段模型下的正常蓄水位工况,最大拉应力为2.82 MPa,作用位置为坝踵周围,最大压应力为2.51 MPa,作用位置为下游坝趾处,而挡水坝段的压应力值为1.84 MPa,作用位置在洞室周围;各抗震工况中,最大拉应力发生在挡水坝段模型下的"正常+地震"工况,其值为4.01 MPa,作用位置为闸墩与溢流面结合处周围,超出了混凝土的动态强度,需要对其进行配筋;最大压应力发生在冲沙孔坝段模型下的"正常+地震"工况,其值为3.25 MPa,作用位置为边墙周围,小于混凝土的抗压强度.有限元计算比《混凝土重力坝设计规范》计算得到的应力小,能基本反映结构实际受力情况,据其选定的混凝土结构为较优结构.
[Abstract]:In order to study the stress distribution in different working conditions of gravity dam, the stress distribution of concrete gravity dam of Lazhai Hydropower Station is simulated by nonlinear elastic-plastic finite element method. At the same time, NB / T 35026-2014 is used to calculate the concrete gravity dam and the results are compared with the finite element method. The results show that the maximum tensile stress and compressive stress occur in the normal storage water level condition under the model of overflow surface hole in each static condition, the maximum tensile stress is 2.82 MPA, and the action position is around the dam heel. The maximum compressive stress is 2.51 MPA, the action position is at the toe of the downstream dam, and the compressive stress of the retaining dam section is 1.84 MPA, which is located around the tunnel, and the maximum tensile stress occurs in the "normal earthquake" condition under the water retaining dam segment model in various seismic conditions. Its value is 4.01 MPA, and the action position is around the junction of pier and overflow surface, which exceeds the dynamic strength of concrete and needs to be reinforced, and the maximum compressive stress occurs in the "normal earthquake" condition under the model of sand flushing hole dam segment. Its value is 3.25 MPA, and the action position is around the side wall, which is less than the compressive strength of concrete. The stress calculated by finite element method is smaller than that obtained by the Code for Design of concrete Gravity Dam, which can basically reflect the actual stress of the structure. According to the concrete structure selected by the finite element method, the concrete structure is a better one.
【作者单位】：云南省水利水电勘测设计研究院;
【分类号】：TV698.1

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