基于数值仿真的堆石坝面板施工期温控防裂方法研究
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摘要
混凝土面板堆石坝作为一种重要的当地材料坝在我国西部地区应用广泛。然而,此类地区混凝土面板的开裂现象也屡见不鲜。作为堆石坝主要的防渗结构,面板一旦开裂将会严重影响坝体耐久性及安全性。为了明确堆石坝面板施工期温度、应力特性,依托阿尔塔什水利枢纽工程堆石坝面板防裂研究工作,以精细化仿真分析为手段,系统分析了影响堆石坝面板温度应力时空分布特性的各种因素,明确了各种防裂措施对面板温度应力特性的影响,为施工期面板防裂提出了明确的建议。
As a kind of an important local material dam,the concrete face rockfill dam is widely used in the West China. Howev-er,the cracking phenomena of the concrete face slab for this kind of dam are common in those regions. As the main anti-seepagestructure for the rockfill dam,once cracks occur on the face slab,the durability and safety of the dam are to be seriously impact-ed. In order to find out the temperature stress characteristics of the concrete face slab for the rockfill dam during construction,allthe factors of the impacts on the temporal and spatial distribution characteristics of the temperature stress are systematically ana-lyzed by means of refined simulation analysis in accordance with the study on the crack prevention of the concrete face slab for therockfill dam of Altash Water Control Project,thus the effects of various crack prevention measures on the temperature stress char-acteristics are defined and then the relevant definite suggestions on the crack prevention of the concrete face slab during construc-tion are proposed as well.
As a kind of an important local material dam,the concrete face rockfill dam is widely used in the West China. Howev-er,the cracking phenomena of the concrete face slab for this kind of dam are common in those regions. As the main anti-seepagestructure for the rockfill dam,once cracks occur on the face slab,the durability and safety of the dam are to be seriously impact-ed. In order to find out the temperature stress characteristics of the concrete face slab for the rockfill dam during construction,allthe factors of the impacts on the temporal and spatial distribution characteristics of the temperature stress are systematically ana-lyzed by means of refined simulation analysis in accordance with the study on the crack prevention of the concrete face slab for therockfill dam of Altash Water Control Project,thus the effects of various crack prevention measures on the temperature stress char-acteristics are defined and then the relevant definite suggestions on the crack prevention of the concrete face slab during construc-tion are proposed as well.
引文
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[22]程展林.水布垭面板堆石坝施工期反分析与蓄水期应力变形研究[R].武汉:长江科学院,2007.
[2]麦家煊,孙立勋.西北口堆石坝面板裂缝成因的研究[J].水利水电技术,1999,30(5):32-34.
[3]张国新,张丙印,王光纶.混凝土面板堆石坝温度应力研究[J].水利水电技术,2001,32(7):1-5.
[4]蒋国澄,傅志安,凤家骥.混凝土面板坝工程[M].武汉:湖北科学技术出版社,1997:1-53.
[5]罗福海,张保军,夏界平.水布垭大坝施工期面板裂缝成因分析及处理措施[J].人民长江,2011,42(1):50—53.
[6]孙役,燕乔,王云清.面板堆石坝面板开裂机理与防止措施研究[J].水力发电,2004,30(2):30-32.
[7]陈守开,马大仲,郭丽霞,等.堆石坝面板混凝土施工期温度和应力全坝段仿真分析[J].华北水利水电学院学报,2012,33(3):9-12.
[8]王瑞骏,王党在,陈尧隆.混凝土面板堆石坝施工期面板温度应力仿真分析[J].西北农林科技大学学报(自然科学版),2004,32(10):123-126.
[9]张国新,厉易生.堆石坝面板收缩性贯穿裂缝的理论分析及防裂措施[J].水力发电学报,2005,24(3):30-33.
[10]杨德福.面板堆石坝混凝土面板防裂分析[J].水利水电技术,1995,26(4):5-10.
[11]朱伯芳.大体积混凝土的温度应力与温度控制[M].北京:中国电力出版社,1999.
[12]陈拯.太阳辐射对拱坝温度场的影响研究及其工程应用[D].北京:清华大学,2007.
[13]彭友松.混凝土桥梁结构日照温度效应理论及应用研究[D].成都:西南交通大学,2007.
[14]朱伯芳.大体积混凝土施工过程中受到的日照影响[J].水力发电学报,1999,18(3):35-41.
[15]林绍忠.大体积结构缝面接触问题全过程仿真计算及快速算法研究[R].武汉:长江科学院,1998.
[16]郑璀莹.混凝土坝中各种接触面的数值模拟方法研究及工程应用[D].北京:中国水利水电科学研究院,2006.
[17]张国新,彭静.考虑摩擦约束时面板温度应力的有限元分析[J].水利学报. 2001(11):75-79.
[18]程琳,袁兴国.气温变化和挤压墙约束对堆石坝面板开裂的影响[J].水力发电,2013,39(1):34-37.
[19]程嵩,张嘎,张建民,等.堆石坝的面板温度应力分析及改善措施研究[J].工程力学,2005,28(4):76-81.
[20]于淼.公伯峡堆石坝面板温度应力及干缩应力问题研究[D].天津:天津大学,2003.
[21]王瑞骏,李九红,王党在,等.堆石坝混凝土面板湿度场及干缩应力研究[J].水力发电学报,2004,23(6):50-54.
[22]程展林.水布垭面板堆石坝施工期反分析与蓄水期应力变形研究[R].武汉:长江科学院,2007.