拱坝振动试验动力响应研究
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摘要
以溪洛渡水电站为工程背景,通过振动台模型试验,研究高拱坝在强地震荷载作用下的动力响应和损伤破坏过程。为使试验模型与实际工程条件尽可能一致,模拟影响拱坝系统地震响应的主要因素。试验表明:拱坝模型在三种不同地震波作用下,未发生明显损伤,各测点的应变值均在材料屈服之内。左、右岸坝肩和上游坝踵在超载水平分别为4.0倍、1.92倍和2.56倍时会发生开裂,但未发现拱向开裂及坝体受压破坏现象。两岸滑裂体在3.2倍超载工况开始有较小范围的可恢复滑动发生,但未出现滑裂体整体滑动现象。
Based on the Xiluodu hydropower station,the dynamic response and damage failure of high arch bar on the strong earthquake are studied by a shaking table experiment.In order to make model test in accordance with the practical engineering condition,the model system includes the major factor of seismic response of arch dam.The result indicates that there are no apparent damages on the arch bar model under the three different earthquake waves and strain values of the measuring points are in the yield strength of the material.Abutment from both left and right banks and upstream heel are cracked in 4.0、1.92、2.56 times overload that of the level of design,but there are no signs of arch cracking and compression failure.Sliding body from both left and right banks have recoverable slide of smaller scope under the 3.2times overload condition,but signs of overall slide aren't happened.
Based on the Xiluodu hydropower station,the dynamic response and damage failure of high arch bar on the strong earthquake are studied by a shaking table experiment.In order to make model test in accordance with the practical engineering condition,the model system includes the major factor of seismic response of arch dam.The result indicates that there are no apparent damages on the arch bar model under the three different earthquake waves and strain values of the measuring points are in the yield strength of the material.Abutment from both left and right banks and upstream heel are cracked in 4.0、1.92、2.56 times overload that of the level of design,but there are no signs of arch cracking and compression failure.Sliding body from both left and right banks have recoverable slide of smaller scope under the 3.2times overload condition,but signs of overall slide aren't happened.
引文
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[3]黄朝刚,杨转运,杨波.拱坝静动力特性的数值模拟分析[J].交通科技与经济,2014,16(5):74-79.
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[7]盛志刚,张楚汉,王光纶,等.拱坝横缝非线性动力响应的模型试验和计算分析[J].水力发电学报,2003(1):34-42.
[2]范书立,陈健云,王建涌,等.高拱坝振动台地震破坏试验研究及数值仿真[J].岩石力学与工程学报,2009,28(3):467-474.
[3]黄朝刚,杨转运,杨波.拱坝静动力特性的数值模拟分析[J].交通科技与经济,2014,16(5):74-79.
[4]陈厚群,李德玉,胡晓,等.有横缝拱坝的非线性动力模型试验和计算分析研究[J].地震工程与工程振动,1995,15(4):10-25.
[5]李德玉,王海波,涂劲,等.拱坝坝体—地基动力相互作用的振动台动力模型试验研究[J].水利学报,2003(7):30-35.
[6]胡晓,侯顺载,王济,等.小湾高拱坝整体及有横缝模型的动力试验研究[J].水利发电,2001(2):48-50.
[7]盛志刚,张楚汉,王光纶,等.拱坝横缝非线性动力响应的模型试验和计算分析[J].水力发电学报,2003(1):34-42.
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