白鹤滩拱坝极限抗震能力研究
|
摘要
在模拟白鹤滩拱坝横缝、坝基交接面和地基可能滑块的基础上,对坝与地基系统进行有限元网格剖分,计入地震动能量向无限远域地基逸散的地基"辐射阻尼"效应,通过超设计地震作用的超载计算和在设计地震作用下降低地基滑块结构面抗剪强度的降强计算,综合分析坝与地基残余位移、缝面开合情况以及坝基交接面开裂范围及其对灌浆帷幕的影响等,获得白鹤滩拱坝超设计地震的超载安全系数约为2.0,设计地震作用下强度储备安全系数约为2.0,白鹤滩拱坝满足设计和校核地震的抗震稳定要求且具一定的超载能力的结论。
The Baihetan Arch Dam foundation system finite element model was established,in which contraction joints,dam foundation interface and foundation potential sliding blocks were simulated,and the viscoelastic artificial boundary was adopted to absorb out-propagating wave energy.A series of calculations were completed by the overloading and shear strength reduction method.Based on comprehensively analyzing dam foundation system residual displacements,dam-foundation interface opening range and its influence on grout curtain as well as the relationship between the residual displacements and overloading factor or strength reduction factor,it can be concluded that Baihetan Arch Dam′s overloading safety factor is approximately 2.0(compared with design earthquake)and the strength reserve coefficient is approximately 2.0.The conclusion shows that Baihetan Arch Dam meets the demand for design and checking earthquake and has some overloading ability.
The Baihetan Arch Dam foundation system finite element model was established,in which contraction joints,dam foundation interface and foundation potential sliding blocks were simulated,and the viscoelastic artificial boundary was adopted to absorb out-propagating wave energy.A series of calculations were completed by the overloading and shear strength reduction method.Based on comprehensively analyzing dam foundation system residual displacements,dam-foundation interface opening range and its influence on grout curtain as well as the relationship between the residual displacements and overloading factor or strength reduction factor,it can be concluded that Baihetan Arch Dam′s overloading safety factor is approximately 2.0(compared with design earthquake)and the strength reserve coefficient is approximately 2.0.The conclusion shows that Baihetan Arch Dam meets the demand for design and checking earthquake and has some overloading ability.
引文
[1]DL5073-2000,水工建筑物抗震设计规范[S].
[2]李德玉,张伯艳,何建涛.官地重力坝极限抗震能力初探[J].水力发电学报,2011,30(6):118-121.Li D Y,Zhang B Y,He J T.Preliminary study on limitaseismic ability of Guandi gravity dam[J].Journal of Hy-droelectric Engineering,2011,30(6):118-121.
[3]Chopra A K.Earthquake analysis of arch dams:factors tobe considered[C]∥The 14th World Conference on Earth-quake Engineering.Beijing:[s.n.],2008.
[4]陈厚群.混凝土高坝强震震例分析和启迪[J].水利学报,2009,40(1):10-18.Chen H Q.Analysis on damages of high concrete damssubjected to strong earthquake and lessons for learning[J].Journal of Hydraulic Engineering,2009,40(1):10-18.
[5]张伯艳,陈厚群.LDDA动接触力的迭代算法[J].工程力学,2007,24(6):1-6.Zhang B Y,Chen H Q.A new LDDA iterative algorithmfor dynamic contact forces[J].Engineering Mechanics,2007,24(6):1-6.
[6]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中黏弹性边界与黏性边界的比较[J].水利学报,2006,37(6):758-763.Liu Y H,Zhang B Y,Chen H Q.Comparison of spring-viscous boundary with viscous boundary for arch dam seis-mic input model[J].Journal of Hydraulic Engineering,2006,37(6):758-763.
[2]李德玉,张伯艳,何建涛.官地重力坝极限抗震能力初探[J].水力发电学报,2011,30(6):118-121.Li D Y,Zhang B Y,He J T.Preliminary study on limitaseismic ability of Guandi gravity dam[J].Journal of Hy-droelectric Engineering,2011,30(6):118-121.
[3]Chopra A K.Earthquake analysis of arch dams:factors tobe considered[C]∥The 14th World Conference on Earth-quake Engineering.Beijing:[s.n.],2008.
[4]陈厚群.混凝土高坝强震震例分析和启迪[J].水利学报,2009,40(1):10-18.Chen H Q.Analysis on damages of high concrete damssubjected to strong earthquake and lessons for learning[J].Journal of Hydraulic Engineering,2009,40(1):10-18.
[5]张伯艳,陈厚群.LDDA动接触力的迭代算法[J].工程力学,2007,24(6):1-6.Zhang B Y,Chen H Q.A new LDDA iterative algorithmfor dynamic contact forces[J].Engineering Mechanics,2007,24(6):1-6.
[6]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中黏弹性边界与黏性边界的比较[J].水利学报,2006,37(6):758-763.Liu Y H,Zhang B Y,Chen H Q.Comparison of spring-viscous boundary with viscous boundary for arch dam seis-mic input model[J].Journal of Hydraulic Engineering,2006,37(6):758-763.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心