面板堆石坝混凝土防渗结构损伤分析
发布时间：2019-02-17 08:45
【摘要】：混凝土面板堆石坝由于具有安全、经济、适应环境和气候条件等优点,深受坝工界的青睐,混凝土面板堆石坝是目前坝工建设中应用最为广泛和发展最快的坝型之一。面板和高趾墙作为面板坝的主要防渗结构,是整个大坝正常工作的最重要防线,保证其安全可靠地工作运行一直是坝工界研究的首要问题。 目前,我国混凝土面板堆石坝的发展正面临着从200m到300m级坝高跨越的技术挑战,尤其是这种超高面板坝,在高应力场下堆石料破碎严重,坝体变形较大,可导致面板破裂,从而威胁大坝的安全运行。由于面板的顺坡向拉应力变化比较大,在混凝凝土面板堆石坝的静、动力分析中,采用线弹性模型进行应用有一定的局限性。本文在国家自然科学基金重大研究计划集成项目(编号：91215301)、国家自然科学基金项目(编号：51379028；51279025)、新世纪优秀人才支持计划资助(编号：NCET-12-0083)和地震行业科研专项经费项目(编号：201208013)资助下,采用混凝土塑性损伤模型,考虑了混凝土的损伤开裂,以及表现出的刚度退化和应变软化的特性,实现了混凝土面板堆石坝面板及高趾墙的静、动力计算方法。较好的模拟了面板及高趾墙损伤的发生和发展过程,验证了混凝土塑性损伤模型在面板堆石坝中的应用。 通过对200m混凝土面板堆石坝的静、动力分析,计算结果表明：地震时,在0.65H(H为坝高)附近顺坡向拉应力最大,面板首先在该部位出现损伤,同时由于鞭稍效应,0.85H面板附近也出现损伤；采用损伤模型,损伤部位的面板出现软化,应力得到释放,计算结果比线弹性模型更加合理；采用塑性损伤模型可以反映混凝土面板渐进破坏过程,通过损伤变量可以清晰地了解面板的损伤分布和薄弱环节。本文的研究成果可以为进一步开展混凝土面板堆石坝极限抗震能力及抗震措施分析提供有效手段。 通过对带有高趾墙的混凝土面板堆石坝静动力反应特性进行了二维有限元分析,计算结果表明：高趾墙在施工和蓄水工程中上、下游两侧受到拉、压应力交替作用,竣工期最大拉应力发生在高趾墙下游面底部,满蓄期最大拉应力发生在高趾墙上游面底部,由于拉应力超过了混凝土抗拉强度,高趾墙出现轻微损伤；在地震荷载作用下,高趾墙底部损伤程度增大,损伤变量最大超过0.8,同时高趾墙顶部也有轻微损伤,损伤变量小于0.6。通过损伤变量可以清晰的看到高趾墙在地震作用下的破坏过程及薄弱环节,研究成果可以为混凝土面板堆石坝抗震设计提供理论指导。
[Abstract]:Concrete face rockfill dam is one of the most widely used and developing dam types in dam construction at present because of its advantages of safety, economy, adaptability to environment and climate, etc. Face slab and high toe wall are the main anti-seepage structure of the face slab dam, which is the most important defense line for the dam to work normally. It is the most important problem to ensure the safe and reliable operation of the dam works. At present, the development of concrete face rockfill dam in China is facing the technical challenge of crossing dam height from 200m to 300m, especially this kind of super-high face rockfill dam, under high stress field, the rockfill material is broken seriously and the dam body is deformed, which can lead to the rupture of the face slab. Thus threatening the safe operation of the dam. Due to the large variation of tensile stress along slope direction of concrete face slab, the application of linear elastic model in static and dynamic analysis of concrete face rockfill dam has certain limitations. This article is in the national natural science foundation major research project integration project (number: 91215301), the national natural science foundation project (number: 51379028); 51279025), supported by the New Century Talent support Program (number: NCET-12-0083) and the Seismic Industry Scientific Research Project (No. 201208013), the plastic damage model of concrete is adopted and the damage and cracking of concrete is considered. The static and dynamic calculation methods of concrete faced rockfill dam and high toe wall are realized. The process of occurrence and development of slab and high toe wall damage is well simulated, and the application of concrete plastic damage model in face rockfill dam is verified. Through the static and dynamic analysis of 200m concrete face rockfill dam, the calculated results show that the tensile stress along the slope near 0.65H (H is the height of the dam) is the largest during the earthquake, and the face slab first appears damage in this part, at the same time, because of the whipping effect, Damage also appeared near 0.85H panel; When the damage model is adopted, the surface of the damaged area is softened and the stress is released. The calculated results are more reasonable than that of the linear elastic model. The plastic damage model can reflect the progressive failure process of concrete slab, and the damage distribution and weak link can be clearly understood by damage variables. The research results in this paper can provide an effective means for further analysis of ultimate seismic capacity and seismic measures of concrete faced rockfill dam. The static and dynamic response characteristics of concrete faced rockfill dam with high toe wall are analyzed by two dimensional finite element method. The results show that the upper and lower sides of high toe wall are subjected to tension and compressive stress alternately in construction and water storage project. The maximum tensile stress during completion occurs at the bottom of the downstream surface of the high toe wall, and the maximum tensile stress occurs at the bottom of the surface of the high toe wall during the full storage period. Because the tensile stress exceeds the tensile strength of concrete, the high toe wall is slightly damaged. Under the earthquake load, the damage degree at the bottom of the high toe wall increases, the maximum damage variable is more than 0.8, and there is slight damage at the top of the high toe wall, and the damage variable is less than 0.6. The damage variables can clearly see the failure process and weak links of high toe wall under earthquake. The research results can provide theoretical guidance for seismic design of concrete faced rockfill dam.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641.43
本文编号：2424980
[Abstract]:Concrete face rockfill dam is one of the most widely used and developing dam types in dam construction at present because of its advantages of safety, economy, adaptability to environment and climate, etc. Face slab and high toe wall are the main anti-seepage structure of the face slab dam, which is the most important defense line for the dam to work normally. It is the most important problem to ensure the safe and reliable operation of the dam works. At present, the development of concrete face rockfill dam in China is facing the technical challenge of crossing dam height from 200m to 300m, especially this kind of super-high face rockfill dam, under high stress field, the rockfill material is broken seriously and the dam body is deformed, which can lead to the rupture of the face slab. Thus threatening the safe operation of the dam. Due to the large variation of tensile stress along slope direction of concrete face slab, the application of linear elastic model in static and dynamic analysis of concrete face rockfill dam has certain limitations. This article is in the national natural science foundation major research project integration project (number: 91215301), the national natural science foundation project (number: 51379028); 51279025), supported by the New Century Talent support Program (number: NCET-12-0083) and the Seismic Industry Scientific Research Project (No. 201208013), the plastic damage model of concrete is adopted and the damage and cracking of concrete is considered. The static and dynamic calculation methods of concrete faced rockfill dam and high toe wall are realized. The process of occurrence and development of slab and high toe wall damage is well simulated, and the application of concrete plastic damage model in face rockfill dam is verified. Through the static and dynamic analysis of 200m concrete face rockfill dam, the calculated results show that the tensile stress along the slope near 0.65H (H is the height of the dam) is the largest during the earthquake, and the face slab first appears damage in this part, at the same time, because of the whipping effect, Damage also appeared near 0.85H panel; When the damage model is adopted, the surface of the damaged area is softened and the stress is released. The calculated results are more reasonable than that of the linear elastic model. The plastic damage model can reflect the progressive failure process of concrete slab, and the damage distribution and weak link can be clearly understood by damage variables. The research results in this paper can provide an effective means for further analysis of ultimate seismic capacity and seismic measures of concrete faced rockfill dam. The static and dynamic response characteristics of concrete faced rockfill dam with high toe wall are analyzed by two dimensional finite element method. The results show that the upper and lower sides of high toe wall are subjected to tension and compressive stress alternately in construction and water storage project. The maximum tensile stress during completion occurs at the bottom of the downstream surface of the high toe wall, and the maximum tensile stress occurs at the bottom of the surface of the high toe wall during the full storage period. Because the tensile stress exceeds the tensile strength of concrete, the high toe wall is slightly damaged. Under the earthquake load, the damage degree at the bottom of the high toe wall increases, the maximum damage variable is more than 0.8, and there is slight damage at the top of the high toe wall, and the damage variable is less than 0.6. The damage variables can clearly see the failure process and weak links of high toe wall under earthquake. The research results can provide theoretical guidance for seismic design of concrete faced rockfill dam.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641.43
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