功果桥水电站导流洞进水塔与明拱段应力应变分析及止水变形控制
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摘要
由于在导流洞进水塔与洞身段之间布置明拱段衔接,因而需在进水塔与明拱段间分缝并设置止水。为分析进水塔与明拱段间的相互作用机理和分缝位置止水的变形特征,结合功果桥水电站导流洞工程,以大型有限元分析软件ANSYS为平台,建立了包含导流洞进水塔、明拱段及基岩在内的三维有限元数值计算模型,采用面—面接触单元模拟进水塔与明拱段衬砌混凝土间的相互作用关系。计算结果表明,施工期与完建期间,进水塔与明拱段在底板位置接触;运行期间随水位的上升,进水塔与明拱段间的挤压力逐渐增大,接触范围由止水内侧逐渐扩大至整个接触面;封堵期间进水塔与明拱段完全接触,且止水最大变形量出现于顶部位置。
As the diversion tunnel intake tower and tunnel body is connected by open arch section,joint design is necessary to be considered between the two structures while stagnant component is settled as well.Combining with the diversion tunnel project of Gongguoqiao hydropower station,3-D finite element numerical model is established by using large-scale FEM software ANSYS.The model consists of three parts: diversion tunnel intake tower,open arch section and the bedrock.Surface-to-surface contact element is used to simulate the relationship of lining concrete between intake tower and open arch section.The interaction mechanism between the intake tower and open arch is analyzed.Meanwhile the deformation characteristics of the stagnant are considered.The results show that the interaction firstly takes place in the lower part of the interface during the end of construction period;water level rising leads to the increase of the extrusion force;meanwhile,the contact scope widens from the inside stagnant to the whole interface;intake tower contacts open arch section completely and the maximum deformation appears at the top stagnant in the blocking mode.
As the diversion tunnel intake tower and tunnel body is connected by open arch section,joint design is necessary to be considered between the two structures while stagnant component is settled as well.Combining with the diversion tunnel project of Gongguoqiao hydropower station,3-D finite element numerical model is established by using large-scale FEM software ANSYS.The model consists of three parts: diversion tunnel intake tower,open arch section and the bedrock.Surface-to-surface contact element is used to simulate the relationship of lining concrete between intake tower and open arch section.The interaction mechanism between the intake tower and open arch is analyzed.Meanwhile the deformation characteristics of the stagnant are considered.The results show that the interaction firstly takes place in the lower part of the interface during the end of construction period;water level rising leads to the increase of the extrusion force;meanwhile,the contact scope widens from the inside stagnant to the whole interface;intake tower contacts open arch section completely and the maximum deformation appears at the top stagnant in the blocking mode.
引文
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[8]石广斌.进水塔基础接触面力学模型对塔体结构应力的影响[J].西北水电,2010(6):63-66.
[9]钱俊梅,江晓红,仲小冬,等.浅谈基于ANSYS软件的接触分析问题[J].煤矿机械,2006,27(7):62-64.
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