坝垛工程根石走失数值模拟研究
发布时间：2018-11-17 18:15
【摘要】：根石走失一直是黄河坝岸中较为突出的工程问题,它直接影响着坝垛工程的基础稳定与整体安全,研究水流作用下的根石走失对实际工程中坝垛的设计具有重要意义。根石走失研究涉及到流固耦合与泥沙冲刷,本文基于计算流体动力学软件FLOW-3D,采用其中的GMO模型、泥沙模型与RNG k-?紊流模型建立了可用于计算根石走失的数值模型,对根石的冲揭走失与冲刷坍塌过程进行了计算分析。为验证所选模型的正确性,分别对溃坝水流冲击下游固定物块和槽内溃坝水流冲刷泥沙的模型试验进行了计算,数值模拟计算得到的水流和泥沙床面变化与物理模型试验实测数据吻合良好。然后,进行了水流作用于立方体块的数值试验,将水流作用力的数值计算值与公式计算值进行对比,发现两者基本一致。验证结果表明数值模型在水流、泥沙与水流作用力上计算准确,可用于根石走失的数值模拟研究。基于数值模型计算了实际坝垛工程的根石冲揭走失与冲刷坍塌过程,计算结果的分析表明,根石在走失的过程中与水流相互影响,坝垛周围根石走失最严重的区域为坝前头,上跨角次之,此两处根石的主要受到水流拖曳力与上举力的作用向下游运动。下跨角处根石走失程度较小,该处根石主要受到坝裆间的水流漩涡力作用脱离坝基,连坝段处部分根石受水流漩涡力作用向上游走失。冲刷坍塌的计算结果表明坝前头处冲刷坑出现的时间最早,冲坑最深,随着水流的持续淘刷冲坑向上跨角和下跨角区域发展,此两处的冲刷坑深度相近,部分泥沙在坝裆间由于水流漩涡作用形成堆丘。本文研究结果表明,坝垛工程中容易出险的部位为坝前头和上跨角,实际工程中应主要对该两处进行防冲加固。
[Abstract]:The root stone loss is always a prominent engineering problem in the Yellow River dam bank, which directly affects the foundation stability and overall safety of the dam stacking project. It is of great significance to study the root stone loss under the action of the water flow for the design of the dam stack in the actual project. The study of root rock loss involves fluid-solid coupling and sediment erosion. Based on the computational fluid dynamics software FLOW-3D, the GMO model, sediment model and RNG k-model are adopted in this paper. A numerical model for calculating the loss of root stone is established by turbulence model, and the process of flushing loss and erosion collapse of root stone is calculated and analyzed. In order to verify the correctness of the selected model, the model tests of the dam-break flow impinging on the downstream fixed block and the dam-break flow in the channel are calculated, respectively. The variation of water flow and sediment bed surface obtained by numerical simulation is in good agreement with the measured data of physical model test. Then, the numerical experiment of the flow acting on the cube block is carried out, and the numerical calculation value of the flow force is compared with the calculated value of the formula, and it is found that the two values are basically the same. The results show that the numerical model is accurate in the calculation of the flow, sediment and flow forces, and can be used in the numerical simulation of the root stone loss. Based on the numerical model, the root stone flushing and scouring collapse process of the actual dam stacking engineering is calculated. The analysis of the calculation results shows that the root stone interaction with the flow of water during the process of the root stone loss, the most serious area of the root stone loss around the dam stack is the front of the dam. The upper span angle is the second, and the two root stones are mainly moved downstream by the drag force and the upward lift force. The root stone at the bottom span angle is small, where the root stone is mainly separated from the dam foundation by the flow vortex force between the dam crotch, and some root stone at the connecting dam segment is lost upstream by the flow vortex force. The calculation results of scour collapse show that the scour pit at the front of the dam is the earliest, the scour pit is the deepest, and the depth of the scour pit is similar with the development of the upward span angle and the lower cross angle area of the water flow. Part of the sediment in the dam crotch is formed by the flow whirlpool. The results of this paper show that the dangerous parts of dam stacking project are the front of dam and the upper span angle, and the two places should be strengthened by anti-scour in actual engineering.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV698;TV149.2
本文编号：2338664
[Abstract]:The root stone loss is always a prominent engineering problem in the Yellow River dam bank, which directly affects the foundation stability and overall safety of the dam stacking project. It is of great significance to study the root stone loss under the action of the water flow for the design of the dam stack in the actual project. The study of root rock loss involves fluid-solid coupling and sediment erosion. Based on the computational fluid dynamics software FLOW-3D, the GMO model, sediment model and RNG k-model are adopted in this paper. A numerical model for calculating the loss of root stone is established by turbulence model, and the process of flushing loss and erosion collapse of root stone is calculated and analyzed. In order to verify the correctness of the selected model, the model tests of the dam-break flow impinging on the downstream fixed block and the dam-break flow in the channel are calculated, respectively. The variation of water flow and sediment bed surface obtained by numerical simulation is in good agreement with the measured data of physical model test. Then, the numerical experiment of the flow acting on the cube block is carried out, and the numerical calculation value of the flow force is compared with the calculated value of the formula, and it is found that the two values are basically the same. The results show that the numerical model is accurate in the calculation of the flow, sediment and flow forces, and can be used in the numerical simulation of the root stone loss. Based on the numerical model, the root stone flushing and scouring collapse process of the actual dam stacking engineering is calculated. The analysis of the calculation results shows that the root stone interaction with the flow of water during the process of the root stone loss, the most serious area of the root stone loss around the dam stack is the front of the dam. The upper span angle is the second, and the two root stones are mainly moved downstream by the drag force and the upward lift force. The root stone at the bottom span angle is small, where the root stone is mainly separated from the dam foundation by the flow vortex force between the dam crotch, and some root stone at the connecting dam segment is lost upstream by the flow vortex force. The calculation results of scour collapse show that the scour pit at the front of the dam is the earliest, the scour pit is the deepest, and the depth of the scour pit is similar with the development of the upward span angle and the lower cross angle area of the water flow. Part of the sediment in the dam crotch is formed by the flow whirlpool. The results of this paper show that the dangerous parts of dam stacking project are the front of dam and the upper span angle, and the two places should be strengthened by anti-scour in actual engineering.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV698;TV149.2
【参考文献】
中国期刊全文数据库 前10条
1 戚蓝;陈辉;费文才;刘东海;;基于精确河道地形的溢流坝泄流三维数值模拟[J];水力发电学报;2016年10期
2 卢新华;杨芳丽;董炳江;毛冰;;明渠湍流泥沙运动的大涡数值模拟[J];武汉大学学报(工学版);2016年03期
3 陈文学;穆祥鹏;崔巍;;南水北调中线工程桥墩壅水特性研究[J];水利水电技术;2015年11期
4 史国庆;文恒;;闸下废旧轮胎消能防冲的三维数值模拟[J];水利水电科技进展;2015年02期
5 王银山;薛庆宇;;2013年汛期黄河山东段河道工程出险原因及对策[J];中国防汛抗旱;2015年03期
6 刘磊;苗润泽;钟德钰;;细沙河床丁坝局部冲刷深度计算公式的验证[J];水力发电学报;2014年02期
7 于铁柱;周城;孙铁军;;黄河内蒙古段河道整治工程冲刷深度计算[J];人民黄河;2014年03期
8 王晓玲;张爱丽;陈华鸿;孙蕊蕊;;三维溃坝洪水在复杂淹没区域演进的数值模拟[J];水利学报;2012年09期
9 王月华;包中进;王斌;;基于Flow-3D软件的消能池三维水流数值模拟[J];武汉大学学报(工学版);2012年04期
10 王平义;高桂景;刘怀汉;;丁坝周围床面受力的试验研究[J];水运工程;2012年03期
中国硕士学位论文全文数据库 前3条
1 韩世娜;空心块体水流拖曳力的试验研究[D];河海大学;2007年
2 毛伟;块体水平拖曳力相互影响试验研究[D];河海大学;2006年
3 张志军;黄河宁夏段坝垛冲刷坑和根石走失的试验研究[D];西安理工大学;2003年
，本文编号：2338664
本文链接：https://www.wllwen.com/kejilunwen/shuiwenshuili/2338664.html
