严寒地区碾压混凝土重力坝设纵缝温控仿真分析
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摘要
碾压混凝土坝作为大体积混凝土结构,由于荷载因素或非荷载因素,坝体可能会出现裂缝。温度、自重和水荷载作为其主要因素,对建筑物的安全和使用等功能具有重要的影响。对于高碾压混凝土重力坝,由于坝体基础部位沿上下游方向的尺寸很大,受施工设备、能力的限制,以及温度应力和综合应力或地基特性等的要求,是否在坝体内部设置纵缝是一个有争议的课题。本文主要研究在坝体设置纵缝对坝体应力的影响。
本文采用国际大型通用有限元软件ANSYS与自主开发主体计算程序相结合的办法来实现对坝体纵缝的仿真计算。对坝体的纵缝处采用接触单元模型来模拟,根据热传导理论、弹性徐变理论、有限元理论及接触单元计算原理,作者编制了能模拟接触单元的碾压混凝土坝温度场和温度应力场三维有限元仿真计算程序。用三维有限元浮动网格法仿真程序来计算坝体的温度场和温度应力场,用ANSYS软件建立带有纵缝的重力坝模型,计算自重和水荷载产生的应力,再把用程序得到的温度应力与ANSYS软件计算的自重应力和水荷载应力通过编制程序进行叠加得到综合应力。
本文通过分析纵缝对坝踵、上游面、坝体中心部位、坝趾、下游面的温度应力以及综合应力的影响情况,总结出规律,得出一些具有应用价值的结论,为实践工程中设计坝体纵缝和进一步的理论研究提供了一定的理论依据。
As the mass concrete structure, Roller Compacted Concrete Dam may have cracks caused by load and non-load. The thermal, dead load and water pressure is the main cause of the crack and they have great influence on safety and the function of using to the building.. Regarding high roller compaction concrete gravity dam, because the basic position of dam body is very large along the size of visiting the direction from head to foot, restricted by construction equipment, ability, the requests of temperature stress and combined stress or the ground characteristic etc.,devise a longitudinal joint or not is a disputed problem. This article main research the stress influence of device longitudinal joint to dam.
This article adopt the method that international large-scale software ANSYS of finite element in common use combines with subject calculation procedure of independent development to realize the dam longitudinal joint simulation computation. The contacting element model is used to simulation the longitudinal joint of the dam. According to heat conduction theory, elastic creep theory, finite element theory and contacting element calculation theory, the 3-D finite element simulation program for RCC dam is worked out to simulate the temperature field and the thermal stress field of the RCC dam with the longitudinal joint. In this paper, the 3-D finite element relocating mesh method is used to calculate the thermal stress field and establish the gravity dam model with the ANSYS software, calculate the stress produced with dead load and water pressure. And then plus the above stress by program we will obtion the combined stress.
This article analyzed the longitudinal joint's influence to dam heel, upstream face, dam center spot, dam toe, downstream face temperature stress as well as the combined stress and summarize the law, obtains some value conclusion, offered certain theoretical foundation for the thing that designed the dam longitudinal joint and the further fundamental research.
本文采用国际大型通用有限元软件ANSYS与自主开发主体计算程序相结合的办法来实现对坝体纵缝的仿真计算。对坝体的纵缝处采用接触单元模型来模拟,根据热传导理论、弹性徐变理论、有限元理论及接触单元计算原理,作者编制了能模拟接触单元的碾压混凝土坝温度场和温度应力场三维有限元仿真计算程序。用三维有限元浮动网格法仿真程序来计算坝体的温度场和温度应力场,用ANSYS软件建立带有纵缝的重力坝模型,计算自重和水荷载产生的应力,再把用程序得到的温度应力与ANSYS软件计算的自重应力和水荷载应力通过编制程序进行叠加得到综合应力。
本文通过分析纵缝对坝踵、上游面、坝体中心部位、坝趾、下游面的温度应力以及综合应力的影响情况,总结出规律,得出一些具有应用价值的结论,为实践工程中设计坝体纵缝和进一步的理论研究提供了一定的理论依据。
As the mass concrete structure, Roller Compacted Concrete Dam may have cracks caused by load and non-load. The thermal, dead load and water pressure is the main cause of the crack and they have great influence on safety and the function of using to the building.. Regarding high roller compaction concrete gravity dam, because the basic position of dam body is very large along the size of visiting the direction from head to foot, restricted by construction equipment, ability, the requests of temperature stress and combined stress or the ground characteristic etc.,devise a longitudinal joint or not is a disputed problem. This article main research the stress influence of device longitudinal joint to dam.
This article adopt the method that international large-scale software ANSYS of finite element in common use combines with subject calculation procedure of independent development to realize the dam longitudinal joint simulation computation. The contacting element model is used to simulation the longitudinal joint of the dam. According to heat conduction theory, elastic creep theory, finite element theory and contacting element calculation theory, the 3-D finite element simulation program for RCC dam is worked out to simulate the temperature field and the thermal stress field of the RCC dam with the longitudinal joint. In this paper, the 3-D finite element relocating mesh method is used to calculate the thermal stress field and establish the gravity dam model with the ANSYS software, calculate the stress produced with dead load and water pressure. And then plus the above stress by program we will obtion the combined stress.
This article analyzed the longitudinal joint's influence to dam heel, upstream face, dam center spot, dam toe, downstream face temperature stress as well as the combined stress and summarize the law, obtains some value conclusion, offered certain theoretical foundation for the thing that designed the dam longitudinal joint and the further fundamental research.
引文
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[4]董福品,朱伯芳.碾压混凝土坝温度徐变应力研究[J].水利水电技术,1987,11(10):22-30.
[5]朱伯芳,许平.碾压混凝土重力坝的温度应力与温度控制[J].水利水电技术,1996,8(4):18-25.
[6]Bofang Zhu,Ping Xu.Thermal stresses in roller compacted concrete gravity dam[J].Dam Engineering,1995,6(3):199-220.
[7]DL/T 5005-92碾压混凝土坝设计准则[S].北京:水利电力出版社,1992:
[8]DL 5108-1999混凝土重力坝设计规范[S].北京:中国电力出版社,2000:
[9]陈尧隆,李守义等龙滩碾压混凝土重力坝施工期温度场和温度应力三维有限元分析.[N].西安:西安理工大学水利水电学院,1995.1
[10]林鸿镁.龙滩大坝碾压混凝土施工问题的研究[J].红水河,2002,2(2):4-11.
[11]SLIT 191-96水工混凝土结构设计规范[S].北京:中国水利水电出版社,1997:
[12]SL211-98水工建筑物抗冰冻设计规范[S].北京:中国水利水电出版社,1998.
[13]yaolong Chen,changjiang Wang,shouy Li.Simulation analysis of thermal stress of RCC dams using 3-D finite element relocating mesh method[J].ADVANCES IN ENGINEERING SOFTWARE,2001,32(9):677-680(SCI,EI)
[14]胡杰安.混凝土拱坝及重力坝坝体接缝设计与构造[M].南昌:水利电力出版社,1986,12
[15]潘家铮.坝工丛书-重力坝的设计和计算[M].北京:中国工业出版社,1965,6
[16]刘观标,潘琳.重力坝纵缝并缝对坝体结构性态的影响[J].水利学报,1992,(5):77-81
[17]陈祥荣,吴爱釚,崔淑君,谢霄易.水口水电站重力坝垂直纵缝不灌浆的研究与实践.水利水电技术[J],1998,12(8):12-14
[18]张义林.水口水电站混凝土重力坝垂直纵缝不灌浆试验研究[J].大坝与安全,1992,53):57-60
[19]陈祥荣.纵缝对水口溢流坝段结构性态影响的研究[J].水利发电学报,1994,(2):21-33
[20]李光宗.拱咀重力坝实测应力分析.水利学报[J],1982,(12):21-27
[21]陈式慧,李广远.混凝土坝纵向缝对应力影响的研究[J].水利发电学报,1989,(3):45-51
[22]Cervera M,Oliver J,Galindo M.Numerical Analysis of Dams with Extensive Crocking Resulting from Concrete Hydration:Simulation of a real case[J].Dam Eengineering,1992,3(1).
[23]俞介刚.丰满大坝纵缝的设计施工及运行情况[J].东北水利水电技术,1999,(8):1-6
[24]曾宪康,王敬群等.南-水库混凝土重力坝取消纵缝的设计与研究[J].水力发电,1994,(9):6-11
[25]李守义,杜效鹄等.龙滩碾压混凝土重力坝分缝研究[J].红水河,2000,(3):5-8
[26]庞海臻,郭占坪,牛永田.宽槽技术在英那河水库扩建中的应用[J].水利水电技术,2004,(3):24-26
[27]黄自瑾,王景海,杨秀兰.碾压式混凝土坝施工方法[M].西安:西北工业大学出版社,1991,7
[28]陈尧隆,李守义等.高碾压混凝土重力坝温度应力和防渗措施研究[R].西安,西安理工大学,1999:11
[29]王勖成,邵敏.有限元法基本原理和数值方法[M].北京:清华大学出版社,1999,8
[30]朱伯芳.有限单元法原理与应用[M].南昌:中国水利电力出版社,1998,10
[31]华东水利学院.弹性力学中的有限元法(修订版)[M].南昌:水利出版社,1982,8
[32]卓家寿.弹性力学中的有限单元法[M].南京:河海大学出版社,1988,9
[33]胡海昌.弹性力学的变分原理及其应用[M].北京:科学出版社,1981,5
[34]徐芝纶.弹性力学[M].北京:人民教育出版社,1979,1
[35]张洪济.热传导[M].北京:高等教育出版社,1992,7
[36]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999,3
[37]温崇哲.热工及热应力基础[M].北京:机械工业出版社,1982
[38]孙菊芳.有限元法及其应用[M].北京:航空航天大学出版社,1990,7
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