某碾压混凝土重力坝设计及溢流断面优化

发布时间：2018-04-26 12:51

本文选题：RCC重力坝 + 溢流断面　；参考：《西北农林科技大学》2017年硕士论文

【摘要】：目前,越来越多的大型水利工程采用RCC重力坝作为目标坝型,但它同样具有坝体断面尺寸大、消耗砼材料多、不能有效地发挥材料的强度等缺点,这些问题都会给工程建设带来不利的影响,本文在对某水库工程RCC重力坝进行设计的基础上,基于ANSYS和MATLAB的联合应用,对RCC重力坝的溢流坝断面进行一阶优化和复合形法优化,减少了材料的用量,降低工程造价,对工程实践有一定的参考价值。本文主要的研究内容及所得成果如下:(1)本文完成了筑坝坝址、坝型、泄水建筑物和消能防冲型式的比选,依据所选结构型式和规范要求,对坝体进行了设计。(2)对WES堰的泄流能力、泄槽水面线、挑距和冲坑深度进行了计算,从而确定了上游特征水位的下泄流量、泄槽的掺气水深以及泄槽末端的流速,并验算了挑距与冲坑深度的比值。最后,根据抗剪断强度公式和应力计算公式验算了坝体的抗滑稳定安全系数、坝基面和坝体的应力。(3)建立了RCC重力坝溢流断面二维平面的参数化模型,用ANSYS有限元软件对溢流断面进行静力分析,研究了其在基本组合和特殊组合下的位移和应力分布。(4)根据RCC重力坝正常运行的要求,确定设计变量、约束条件和目标函数。根据复合形法的基本原理,运用MATLAB软件编写了复合形法主函数等程序,通过反射、收缩、扩张等运算,实现了在可行域内的优化搜索,并用ANSYS进行求解。(5)以溢流坝断面面积最小为目标,分别采用ANSYS一阶优化方法和基于MATLAB的复合形法对其进行优化。结果表明:复合形法优化效果最为明显,两种荷载组合下优化后的断面面积分别减少了577.32m2和509.27m2,面积优化率分别达到16.73%和14.76%;ANSYS优化方法效果次之,两种荷载组合下优化后的断面面积分别减少了472.27m2和442.20m2,面积优化率分别达到13.7%和12.8%。复合形法操作简单,应用广泛,在结构优化设计中具有一定的应用价值。
[Abstract]:At present, more and more large water conservancy projects use RCC gravity dam as the target dam type, but it also has the disadvantages of large section size of the dam body, more concrete material and not effective use of material strength. These problems will bring adverse effects on engineering construction. This paper is the foundation of the design of a reservoir engineering RCC gravity dam. On the basis of the combined application of ANSYS and MATLAB, the first order optimization and compound shape optimization of spillway dam section of RCC gravity dam are optimized, which reduces the amount of material and reduces the cost of the project. It has a certain reference value to the engineering practice. The main contents and results of this paper are as follows: (1) this paper completed dam site, dam type and discharge building. The dam body is designed according to the selected structure type and standard requirement. (2) the discharge capacity of the WES weir, the water surface line of the slots, the pitch and the depth of the punching pit are calculated, and the discharge flow of the characteristic water level in the upper reaches, the depth of the doughnut and the flow velocity at the end of the slots are determined, and the distance and impulse are checked. The ratio of pit depth. Finally, according to the formula of shear strength and the formula of stress calculation, the stability safety factor of the dam and the stress of dam foundation surface and dam body are checked. (3) a parameterized model of the two-dimensional plane of the overflow section of RCC gravity dam is established, and the static analysis of the overflow section is carried out with the ANSYS finite element software, and its basic combination is studied. The displacement and stress distribution under special combination. (4) according to the requirements of the normal operation of RCC gravity dam, design variables, constraints and objective functions are determined. According to the basic principle of the compound shape method, the program of the compound method main function is written by MATLAB software, and the optimization search in the feasible region is realized by the operation of reflection, contraction, expansion and so on. ANSYS is used to solve the problem. (5) taking the minimum section area of the overflow dam as the goal, the first order optimization method of ANSYS and the compound shape method based on MATLAB are used to optimize them respectively. The results show that the optimization effect of the composite shape method is most obvious. The surface product of the two kinds of combined loads is reduced by 577.32m2 and 509.27m2 respectively, and the area optimization rate is divided. Do not reach 16.73% and 14.76%; the ANSYS optimization method is the second one. The optimized section area is reduced by 472.27m2 and 442.20m2 respectively under the two load combinations. The area optimization rate is 13.7% and the 12.8%. compound method is simple and widely used, and it has a certain application value in the structural optimization design.

【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV642

【参考文献】