基于附加质量的土石混合体边坡地震响应研究
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摘要
基于附加质量法,并利用ABAQUS强大的二次开发功能,对金沙江中游梨园水电站左岸一土石混合体边坡在蓄水后地震作用下的稳定性进行分析研究。结果表明:在整个地震历程中,边坡岩土体运动速度不但在数值上呈现波动,而且其运动方向也呈现急剧的变化,这种循环往复的变化将是导致岩土体失稳的重要原因;在地震波传播过程中,由其产生的巨大冲击波使边坡浅部岩土体整体朝向坡外运动,但由于库水压力的作用,库水位以下边坡体呈现向坡外水平运动,而库水位以上边坡岩土体呈现向上运动现象;在地震作用下该边坡虽然出现不同程度的塑性屈服,但是未形成贯通的塑性区,整体稳定性较好。
Based on added mass method,using the powerful function of secondary development of ABAQUS,the stability of a soil-rock mixture slope on the left bank of Liyuan hydropower station on midstream Jinsha River is analyzed under the condition of earthquake after impounding.The results show that:(1)during the whole process of earthquake,both the value and the direction of the moving velocity of geomaterial change sharply,and this kind of repetitive variation may be one of important reasons that geological bodies loose their stability;(2)the enormous seismic shock wave makes shallow part of the slope mass move outside,but the motion direction of geomaterial under water level is mainly horizontal while other parts mainly move in vertical direction because of the reservoir water pressure;and(3)although the slope shows different plastic yields under seismic condition,continuous plastic zone does not come into being.So it can be inferred that the slope still keeps stable under seismic condition.
Based on added mass method,using the powerful function of secondary development of ABAQUS,the stability of a soil-rock mixture slope on the left bank of Liyuan hydropower station on midstream Jinsha River is analyzed under the condition of earthquake after impounding.The results show that:(1)during the whole process of earthquake,both the value and the direction of the moving velocity of geomaterial change sharply,and this kind of repetitive variation may be one of important reasons that geological bodies loose their stability;(2)the enormous seismic shock wave makes shallow part of the slope mass move outside,but the motion direction of geomaterial under water level is mainly horizontal while other parts mainly move in vertical direction because of the reservoir water pressure;and(3)although the slope shows different plastic yields under seismic condition,continuous plastic zone does not come into being.So it can be inferred that the slope still keeps stable under seismic condition.
引文
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[3]陈蜀俊,党晓英,曾心传,等.奉节长江大桥北岸边坡在地震荷载作用下的稳定性分析[J].岩石力学与工程学报,2004,23(4):657–662.(CHEN Shujun,DANG Xiaoying,ZENG Xinchuan,et al.Seismic stability analysis of slope at north bank of Fengjie Changjiang River bridge[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):657–662.(in Chinese))
[4]姜彤.边坡在地震力作用下的加卸载响应规律与非线性稳定分析[博士学位论文][D].北京:中国地震局地质研究所,2004.(JIANG Tong.Loading-unloading responses of slopes under seismic load and nonlinear stability analysis[Ph.D.Thesis][D].Beijing:Institute of Geology,China Earthquake Administration,2004.(in Chinese))
[5]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.(QI Shengwen,WU Faquan,YAN Fuzhang,et al.Dynamic response analysis of rock slope[M].Beijing:Science Press,2007.(in Chinese))
[6]周顺华,刘建国,王炳龙,等.水下边坡稳定性的离心模拟试验研究[J].铁道学报,2001,23(1):76–79.(ZHOU Shunhua,LIU Jianguo,WANG Binglong,et al.Centrifugal simulating test research on stability of underwater slope[J].Journal of the China Railway Society,2001,23(1):76–79.(in Chinese))
[7]刘建国,周顺华,宫全美.水下边坡稳定性计算模式的探讨[J].上海铁道大学学报,2000,21(2):35–38.(LIU Jianguo,ZHOU Shunhua,GONG Quanmei.Calculating mode for the stability of underwater slope[J].Journal of Shanghai Tiedao University,2000,21(2):35–38.(in Chinese))
[8]甘厚义,周虎鑫,林本銮,等.关于山区高填方工程地基处理问题[J].建筑科学,1998,14(6):16–22.(GAN Houyi,ZHOU Huxin,LIN Benluan,et al.Research on the treatment of high filled up ground with large stones in mountain areas[J].Building Science,1998,14(6):16–22.(in Chinese))
[9]WESTERGAARD H M.Water pressures on dams during earthquakes[J].Transactions of the American Society of Civil Engineers,1933,98:418–433.
[10]居荣初,曾心传.弹性结构与液体的耦联振动理论[M].北京:地震出版社,1983.(JU Rongchu,ZENG Xinchuan.Theory of coupled vibration of elastic body and liquid[M].Beijing:Earthquake Press,1983.(in Chinese))
[11]中华人民共和国交通部.公路工程通用标准规范汇编[M].北京:人民交通出版社,1991.(Ministry of Communication of People′s Republic of China.General standards assembly of highway engineering[M].Beijing:China Communications Press,1991.(in Chinese))
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