基于APDL的RCC重力坝温度控制及优化研究
发布时间：2019-05-27 02:50
【摘要】：碾压混凝土(RCC)重力坝施工工艺简单、造价较低、技术成熟，国内外有无数的工程均采取了这种坝型。施工过程中温度变化和徐变产生的应力对坝体的影响较大，故对坝体温度场、应力场的分析十分必要。本文使用ANSYS有限元软件中的参数化编程（简称APDL），针对上存碾压混凝土(RCC)重力坝工程，对其温度场、徐变应力场进行分析，提出温度控制措施。根据提供的勘查设计等资料，验证温控措施的有效性，并得出指导工程实践的措施。主要研究内容如下： （1）介绍RCC重力坝温控研究思路，以及温度场、徐变应力场的计算原理，研究在仿真分析中如何实现徐变、边界条件、本构关系等的变化，根据实际工期安排、材料属性、边界条件及荷载等编写APDL，分析热应力耦合场，并通过生死单元技术模拟坝体浇筑过程。 （2）针对RCC重力坝中高温期浇筑并埋设冷却水管的部分，使用APDL编写优化程序，得出最优的通水参数，浇筑薄层在环境月平均气温超过20℃时，进行通水冷却，参考优化通水参数并结合实际工程，选用通水流量15m3/d，水管间距0.75m*1.5m，通水温差5℃，使得在满足坝体温度控制标准下更经济。当温度超过25℃进入汛期，停止浇筑。并提出智能冷却水管模型，根据反馈动态调节通水参数，保证大体积混凝土的强度、节约成本。 （3）对坝体温度场及徐变应力场进行仿真分析，结果表明：无温控措施下的典型坝段施工期最高温度达到41℃，超过工程温度控制标准，故采取高温长间歇和冷却水管措施是必要的。采取相应温控措施后的典型溢流坝段温度场云图、典型溢流坝段等值线图及典型节点温度历时曲线中最高温度均控制在标准之内。采取相应温控措施后的典型坝段徐变应力场增量云图、典型节点徐变应力历时曲线拉应力均不超过0.2Mpa，不超过各级配材料的允许拉应力。坝体整体的温度场及徐变应力场分布与工程一般规律基本一致，并为坝体施工提供了一系列温控措施。
[Abstract]:Roller compacted concrete (RCC) gravity dam has the advantages of simple construction technology, low cost and mature technology. Many projects at home and abroad have adopted this kind of dam type. During the construction process, the stress produced by temperature change and creep has great influence on the dam body, so it is necessary to analyze the temperature field and stress field of the dam body. In this paper, the temperature field and creep stress field of RCC (RCC) gravity dam project are analyzed by using parametric programming in ANSYS finite element software (APDL), for short), and the temperature control measures are put forward. According to the survey and design data provided, the effectiveness of temperature control measures is verified, and the measures to guide the engineering practice are obtained. The main research contents are as follows: (1) this paper introduces the research idea of temperature control of RCC gravity dam, as well as the calculation principle of temperature field and creep stress field, and studies how to realize the change of creep, boundary condition and constitutive relation in simulation analysis. According to the actual construction period, material properties, boundary conditions and loads, APDL, analysis of thermal stress coupling field is compiled, and the pouring process of dam body is simulated by life and death element technique. (2) aiming at the part of the RCC gravity dam pouring and burying the cooling pipe during the high temperature period, the optimization program is compiled by APDL, and the optimal water flow parameters are obtained. When the monthly average temperature of the environment is more than 20 鈩，
本文编号：2485846
[Abstract]:Roller compacted concrete (RCC) gravity dam has the advantages of simple construction technology, low cost and mature technology. Many projects at home and abroad have adopted this kind of dam type. During the construction process, the stress produced by temperature change and creep has great influence on the dam body, so it is necessary to analyze the temperature field and stress field of the dam body. In this paper, the temperature field and creep stress field of RCC (RCC) gravity dam project are analyzed by using parametric programming in ANSYS finite element software (APDL), for short), and the temperature control measures are put forward. According to the survey and design data provided, the effectiveness of temperature control measures is verified, and the measures to guide the engineering practice are obtained. The main research contents are as follows: (1) this paper introduces the research idea of temperature control of RCC gravity dam, as well as the calculation principle of temperature field and creep stress field, and studies how to realize the change of creep, boundary condition and constitutive relation in simulation analysis. According to the actual construction period, material properties, boundary conditions and loads, APDL, analysis of thermal stress coupling field is compiled, and the pouring process of dam body is simulated by life and death element technique. (2) aiming at the part of the RCC gravity dam pouring and burying the cooling pipe during the high temperature period, the optimization program is compiled by APDL, and the optimal water flow parameters are obtained. When the monthly average temperature of the environment is more than 20 鈩，
本文编号：2485846
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