地震波作用下抗滑桩的失效机理
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摘要
目前有关地震荷载作用下滑坡体上抗滑桩的失效机理还不清晰,对其与震波的响应机制还存在模糊认识,为了有效解析地震波与抗滑桩锚固体系间的相互作用机理,以极限分析的上限定理为工具,在确定坡体潜在滑动面的条件下,从能量角度定义了抗滑桩锚固体系的安全性,研究了地震荷载作用下滑坡锚固体系的能量输入与耗散机制,分析了导致滑坡启动和锚固体系失稳的震波特征,并给出了其临界值的计算模式。最后,通过算例表明震时抗滑桩失效是在特定方向和大小的地震荷载反复作用下损伤间断性累积的结果。
The failure of anti-slide pile in earthquake is one important factor that aggravates the harm of mountain hazards.However,the mechanism of it and its response mechanism to seismic wave are not clear at present,and the interaction mechanism between anchor system and seismic wave can't be resoluted.Therefore,based on energy theory,taking the upper bound theorem used in limit analysis as measure,and assuming the sliding face as arc,the safety of anchor system was defined,and then the mechanism of energy input and dissipation under earthquake was studied.Furthermore,the characters seismic wave which induces the damage of anchor system was also analyzed,and the calculating formulas were suggested.At last,an example was given to show that the failure mechanism of anti-slide pile is the result of discontinuous damage accumulation under seismic load with special direction and value.
The failure of anti-slide pile in earthquake is one important factor that aggravates the harm of mountain hazards.However,the mechanism of it and its response mechanism to seismic wave are not clear at present,and the interaction mechanism between anchor system and seismic wave can't be resoluted.Therefore,based on energy theory,taking the upper bound theorem used in limit analysis as measure,and assuming the sliding face as arc,the safety of anchor system was defined,and then the mechanism of energy input and dissipation under earthquake was studied.Furthermore,the characters seismic wave which induces the damage of anchor system was also analyzed,and the calculating formulas were suggested.At last,an example was given to show that the failure mechanism of anti-slide pile is the result of discontinuous damage accumulation under seismic load with special direction and value.
引文
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[6]陈惠发.极限分析与土体塑性[M].北京:人民交通出版社,1995.
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[8]李杰,李国强.地震工程学导论[M].北京:建筑工业出版社,1992.
[9]魏琏,王广军.地震作用[M].北京:地震出版社,1981.
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[11]Keefer D K.Landslides caused by earthquake[J].Bulle-tin of Geological Society ofAmerica,1984,95(4):406-421.
[12]Ambraseys N,Srbulov M.Earthquake induced displace-ments of slopes[J].Soil Dynamics and Earthquake Engi-neering,1995,14(1):59-71.
[13]Marzorati S,Luzi L,Amicis MDe.Rock falls induced byearthquakes:a statistical approach[J].Soil Dynamics andEarthquake Engineering,2002,22(7):565-577.
[14]中国科学院水利部成都山地所.都江堰拉法基水泥有限公司矿山上山公路地震损毁边坡及路基修复整治工程工程地质勘察报告[R].2008.
[15]Loc Vu-Quoc,Zhang Xiang,Lesburg L.Normal and tan-gential force-displacement relations for frictional elasto-plas-tic contact of spheres[J].International Journal of Solidsand Structures,2001,38(36):6455-6489.
[2]Abdoun T,Dobry R,O’rourke TD,et al.Pile response tolateral spreads:centrifuge modeling[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(10):869-878.
[3]Brandenberg S J,Boulanger R W,Kutter B L,et al.Be-havior of pile foundations in laterally spreading ground dur-ing centrifuge tests[J].Journal of Geotechnical and Geo-environmental Engineering,2005,131(11):1378-1391.
[4]Yu Yuzhen,Deng Lijun.Centrifuge modeling of seismic be-havior of slopes reinforced by stabilizing pile[J].ChineseJournal of Geotechnical Engineering,2007,29(9):1320-1323.[于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320-1323.]
[5]Dong Pu.Characteristics of earthquake and the mechanismof its demolition on building structure[J].Journal ofHuizhou University:Nat Sci,2002,22(3):94-96.[董璞.地震动特性及引起的结构破坏机理浅析[J].惠州学院学报:自然科学版,2002,22(3):94-96.]
[6]陈惠发.极限分析与土体塑性[M].北京:人民交通出版社,1995.
[7]Xong Bin.The motion mechanism of viscous debris[D].Beijing:Tsinghua University,1996.[熊斌.黏性泥石流运动机理[D].北京:清华大学,1996.]
[8]李杰,李国强.地震工程学导论[M].北京:建筑工业出版社,1992.
[9]魏琏,王广军.地震作用[M].北京:地震出版社,1981.
[10]Lian Qingguo,Han Wenfeng,Ma Runyong,et al.Physi-cal simulation study on dynamic failures of layered rockmasses under strong ground motion[J].Rock and Soil Me-chanics,2005,26(8):1307-1311.[梁庆国,韩文峰,马润勇等.强地震动作用下层状岩体破坏的物理模拟研究[J].岩土力学,2005,26(8):1307-1311.]
[11]Keefer D K.Landslides caused by earthquake[J].Bulle-tin of Geological Society ofAmerica,1984,95(4):406-421.
[12]Ambraseys N,Srbulov M.Earthquake induced displace-ments of slopes[J].Soil Dynamics and Earthquake Engi-neering,1995,14(1):59-71.
[13]Marzorati S,Luzi L,Amicis MDe.Rock falls induced byearthquakes:a statistical approach[J].Soil Dynamics andEarthquake Engineering,2002,22(7):565-577.
[14]中国科学院水利部成都山地所.都江堰拉法基水泥有限公司矿山上山公路地震损毁边坡及路基修复整治工程工程地质勘察报告[R].2008.
[15]Loc Vu-Quoc,Zhang Xiang,Lesburg L.Normal and tan-gential force-displacement relations for frictional elasto-plas-tic contact of spheres[J].International Journal of Solidsand Structures,2001,38(36):6455-6489.
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