拱坝坝后局部加固对大坝工作性态影响研究

发布时间：2018-02-16 13:58

本文关键词： 拱坝加固有限元法工作性态大坝安全温度应力　出处：《水利水电技术》2017年09期 　论文类型：期刊论文

【摘要】：为明确坝后局部加固体对拱坝工作性态的影响,应用结构多场仿真与非线性分析软件SAPTIS对50年后拱坝任意时刻温度场进行仿真模拟,研究了某拱坝无、有加固体情况下大坝在典型工况下的变形、应力差异和结合面状态。模型中,坝体和基础网格采用六面体网格,边界约束条件为地基底面、地基侧面以及上下游面加法向链杆约束,并考虑了正常水位和水库水温变化过程、气温变化过程、混凝土水化热、太阳辐射等影响。结果显示:在正常温降情况下,该大坝无加固体和有加固体时,向下游变形分别为23.1 mm和20.1 mm,差别为13%,在正常温升情况下,差别达20%;有加固体时,上游面边缘部位受拉区域范围增加,与下游加固体尺寸大致相同,但拉应力最大值明显减小,由1.3 MPa减小为0.9 MPa。结果表明:大坝与加固体结合面普遍处于压剪状态,上部边缘区域应力集中现象明显,内部应力较小;坝后局部加固体增大了坝体刚度、减小了大坝向下游变形、改变了坝体应力分布规律,使得应力分布更均匀化,对大坝工作性态有一定改善作用。
[Abstract]:In order to understand the effect of local addition of solid on the working behavior of arch dam, the temperature field of arch dam at any time after 50 years is simulated by structural multi-field simulation and nonlinear analysis software SAPTIS, and no arch dam is studied. In the model, the dam and foundation mesh are hexahedron mesh, and the boundary constraint condition is the foundation bottom surface. The side of the foundation and the upper and lower side of the foundation are constrained by the normal chain bar, and the effects of normal water level and reservoir water temperature, temperature change, concrete hydration heat, solar radiation and so on are taken into account. The results show that: under the normal temperature drop, When the dam has no solid or solid, the downstream deformation is 23.1 mm and 20.1 mm respectively, the difference is 13.1 mm, and under normal temperature rise, the difference reaches 20 parts; when the solid is added, the range of the tension area on the edge of the upstream surface increases. However, the maximum tensile stress decreases from 1. 3 MPa to 0. 9 MPa. The results show that the stress concentration in the upper edge of the dam is generally in the state of compression and shear, and the stress concentration in the upper edge is obvious. The local addition of solid behind the dam increases the stiffness of the dam, reduces the downstream deformation of the dam, changes the stress distribution of the dam, makes the stress distribution more uniform, and improves the working behavior of the dam to some extent.
【作者单位】：新疆额尔齐斯河流域开发工程建设管理局;中国水利水电科学研究院;
【基金】：国家自然科学基金项目(51579252,51439005) 国家重点研发计划项目(2016YFB0201003) 流域水循环模拟与调控国家重点实验室基金项目
【分类号】：TV698.23

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