考虑施工期至运行期全过程温度荷载作用的高碾压混凝土拱坝结构分缝研究
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摘要
在碾压混凝土拱坝设计中,选择合理的分缝方案是改善坝体应力分布、保证大坝安全的关键技术问题。本文对万家口子碾压混凝土拱坝,根据碾压混凝土坝的实际成层浇筑过程和施工期的温度作用,通过三维有限元数值仿真计算,对设置8缝、10缝和不设缝情况下的坝体应力和位移分布规律进行分析和比较,并探讨了诱导缝的作用以及设置诱导缝的利弊。最后,确定了8缝方案为最优方案。计算结果表明,对坝体设置诱导缝可以有效的释放坝体应力。但坝体分缝条数不宜过多。
The reasonable joint-setting is vital to RCC arch dam for ameliorating the stress distribution of the dam and ensuring the safety.The stress and deformation distributions of the Wanjiakaozi RCC Dam,with maximum height 157m,for three joint-setting schemes considering the action of temperature load in the whole process from construction to put into operation are calculated by means of 3-D FEM.The effectiveness of induced joint and its advantages and disadvantages are investigated.According to the comparison the scheme with 8 joints is selected as the best scheme.It is concluded that the induced joint is effective to release thc stress of dam,but the amount of joints must be control in a suitable level.
The reasonable joint-setting is vital to RCC arch dam for ameliorating the stress distribution of the dam and ensuring the safety.The stress and deformation distributions of the Wanjiakaozi RCC Dam,with maximum height 157m,for three joint-setting schemes considering the action of temperature load in the whole process from construction to put into operation are calculated by means of 3-D FEM.The effectiveness of induced joint and its advantages and disadvantages are investigated.According to the comparison the scheme with 8 joints is selected as the best scheme.It is concluded that the induced joint is effective to release thc stress of dam,but the amount of joints must be control in a suitable level.
引文
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[3]刘国民.连杆接触单元非线性模型及其工程应用[J].福州大学学报,1997,25(6):74-79.
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[7]古泉,王光纶,徐艳杰.强震作用下高拱坝横缝张开非线性反应的研究[J].水利水电技术,2001,32(9):1-47.
[8]张小刚,宋玉普.碾压混凝土坝诱导缝设置及拱坝诱导缝等效强度[J].水利水运工程学报,2003,(4):67-73.
[9]Chang X L,Zhou W.A contact model on basis of the augmented lagrange method and engineering application[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(9):1568-1572.
[10]顾爱军,王向东,徐道远,朱为玄,金玉,杨小令.碾压混凝土拱坝诱导缝的作用探讨[J].扬州大学学报(自然科学版),2003,6(1):66-70.
[11]陈媛,张林,周坤,胡秋成.高碾压混凝土拱坝分缝形式及破坏机理研究[J].水利学报,2005,36(5):519-524.
[12]许有飞,何江达,梁照江,王开云.沙牌碾压混凝土拱坝坝体分缝形式的结构特性研究[J].贵州水力发电,2004,18(5):104-109.
[13]陈刚、江启升、张林、何江达.碾压混凝土高拱坝分缝形式研究[J].四川大学学报(工程科学版),2000,32(6):15-19.
[14]曾昭扬,马黔.高碾压混凝土拱坝中的构造缝问题研究[J].水力发电,1998,(2):30-33.
[15]刘小强,张林,陈建叶,刘林广.高碾压混凝土拱坝不同分缝形式结构特性的试验研究[J].水电站设计,2003,19(4):32-35.
[16]李鹏,邹丽春,傅少君,陈胜宏.小湾拱坝诱导缝模拟计算[J].武汉大学学报(工学版),2005,38(3):27-30.
[17]刘海成,吴智敏,宋玉普.碾压混凝土拱坝诱导缝开裂试验研究[J].水利学报,2004,(5):99-105.
[18]宋玉普,王学志,黄志强,孙荣书.碾压混凝土拱坝单向间隔诱导缝等效强度研究[J].水利学报,2005,36(5):544-548.
[19]张小刚,宋玉普,吴智敏.碾压混凝土穿透型诱导缝等效强度和断裂试验研究[J].水利学报,2004,(3):98-102.
[20]徐艳杰,张楚汉,王光纶,金峰.小湾拱坝模拟实际横缝间距的非线性地震反应分析[J].水利学报,2001,(4):68-74.
[2]Fenves G L,Mojtahedi S.Earthquake response of an arch dam with construction joint opening[J].Dam engineering,1993,4(2):63-89.
[3]刘国民.连杆接触单元非线性模型及其工程应用[J].福州大学学报,1997,25(6):74-79.
[4]Lei Xiaoyan,Swoboda G.New contact elements for the simulation of faults and cracks in arch dam[A].In:Practice andTheory of Arch Dams-Proc of the Int Symp on Arch Dams[C].Nanjing,China,1992.245-250.
[5]傅作新.张燎军.考虑有键槽的施工缝时大体积混凝土结构的应力分析[J].土木工程学报,1994,27(4):1-7.
[6]朱伯芳.有限厚度带键槽接缝单元及接缝对混凝土坝应力的影响[J].水利学报,2001,(2):63-69.
[7]古泉,王光纶,徐艳杰.强震作用下高拱坝横缝张开非线性反应的研究[J].水利水电技术,2001,32(9):1-47.
[8]张小刚,宋玉普.碾压混凝土坝诱导缝设置及拱坝诱导缝等效强度[J].水利水运工程学报,2003,(4):67-73.
[9]Chang X L,Zhou W.A contact model on basis of the augmented lagrange method and engineering application[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(9):1568-1572.
[10]顾爱军,王向东,徐道远,朱为玄,金玉,杨小令.碾压混凝土拱坝诱导缝的作用探讨[J].扬州大学学报(自然科学版),2003,6(1):66-70.
[11]陈媛,张林,周坤,胡秋成.高碾压混凝土拱坝分缝形式及破坏机理研究[J].水利学报,2005,36(5):519-524.
[12]许有飞,何江达,梁照江,王开云.沙牌碾压混凝土拱坝坝体分缝形式的结构特性研究[J].贵州水力发电,2004,18(5):104-109.
[13]陈刚、江启升、张林、何江达.碾压混凝土高拱坝分缝形式研究[J].四川大学学报(工程科学版),2000,32(6):15-19.
[14]曾昭扬,马黔.高碾压混凝土拱坝中的构造缝问题研究[J].水力发电,1998,(2):30-33.
[15]刘小强,张林,陈建叶,刘林广.高碾压混凝土拱坝不同分缝形式结构特性的试验研究[J].水电站设计,2003,19(4):32-35.
[16]李鹏,邹丽春,傅少君,陈胜宏.小湾拱坝诱导缝模拟计算[J].武汉大学学报(工学版),2005,38(3):27-30.
[17]刘海成,吴智敏,宋玉普.碾压混凝土拱坝诱导缝开裂试验研究[J].水利学报,2004,(5):99-105.
[18]宋玉普,王学志,黄志强,孙荣书.碾压混凝土拱坝单向间隔诱导缝等效强度研究[J].水利学报,2005,36(5):544-548.
[19]张小刚,宋玉普,吴智敏.碾压混凝土穿透型诱导缝等效强度和断裂试验研究[J].水利学报,2004,(3):98-102.
[20]徐艳杰,张楚汉,王光纶,金峰.小湾拱坝模拟实际横缝间距的非线性地震反应分析[J].水利学报,2001,(4):68-74.
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