土钉边坡支护结构动力计算方法研究
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摘要
基于均匀土层的剪切梁理论,得到了边坡在水平地震作用下的动力响应。根据土钉本身质量很小,将土钉受到的惯性力忽略。其在压力注浆后形成"狼牙棒"与周围土体一起运动,运动受周围土体控制,其破坏取决于土钉所能承受的变形大小,而并非惯性力,因此将土钉简化为一维无质量的弹性杆,通过变形协调和虎克定律得到了土钉轴力地震响应。将提出的计算方法应用于一个工程案例,进行了地震动力分析与抗震验算。为了验证提出的计算方法的合理性,通过ADINA软件进行了对比分析,结果表明这种计算方法对土质较均匀的边坡动力抗震设计和分析是安全、可靠、合理的。这种计算方法给土钉支护结构的地震分析及抗震设计提供了理论依据。
Based on shear beam theory,seismic response of a slope was obtained under condition of horizontal earthquake excitation.Because mass of soil nailing was smaller compared to that of soil,its inertia force could be ignored.The movements both of soil nailing and soil where nearly in phase and the damage of a soil nailing depended on the size of its deformation not its inertia force,so the soil nailing was simplified as a one-dimension elastic rod without mass.The seismic response of the soil nailing was derived using compatibility of deformation and Hooke's law.The method was applied to a practical case to conduct seismic analysis and design.Using finite element software(ADINA) to verify the proposed method,the results showed that its design and the analysis are safe and reliable.The calculation method provided a theoretical basis for earthquake analysis and a seismic design of a soil nailing supporting structure.
Based on shear beam theory,seismic response of a slope was obtained under condition of horizontal earthquake excitation.Because mass of soil nailing was smaller compared to that of soil,its inertia force could be ignored.The movements both of soil nailing and soil where nearly in phase and the damage of a soil nailing depended on the size of its deformation not its inertia force,so the soil nailing was simplified as a one-dimension elastic rod without mass.The seismic response of the soil nailing was derived using compatibility of deformation and Hooke's law.The method was applied to a practical case to conduct seismic analysis and design.Using finite element software(ADINA) to verify the proposed method,the results showed that its design and the analysis are safe and reliable.The calculation method provided a theoretical basis for earthquake analysis and a seismic design of a soil nailing supporting structure.
引文
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[2]朱彦鹏,李忠.深基坑土钉支护稳定性分析方法的改进及软件开发[J].岩土工程学报,2005,27(8):939-943.
[3]朱彦鹏,王秀丽,狄生奎,等.黄土边坡建筑的抗滑移设计[J].甘肃工业大学学报,2002,28(2):85-89.
[4]朱彦鹏,王秀丽,张贵文,等.兰州中广大厦超长深基坑支护的设计、施工与实验监测[J].工程力学(增刊),2003:336-341.
[5]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004,2.
[6]ADINA.Research and Development Inc.,ADINA Theoryand Modeling Guide.Report ARD 95-8,ADINA R&DInc.,Watertown,MA,1995.
[7]Idriss I M,Seed H B.Seismic response of horizontal soillayers[J].Soil Mech Found Div,ASCE,1968,94(SM4):1003-1031.
[8]杨桂通.土动力学[M].北京:中国建材工业出版社,2000.
[9]谢定义.土动力学[M].西安:西安交通大学出版社,1998.
[10]R.W.克拉夫,J.彭津.结构动力学(王光远等译).科学出版社,1981.
[11]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[12]董建华.地震作用土钉支护边坡动力分析与抗震设计方法研究[D].兰州:兰州理工大学,2008.
[13]董建华,朱彦鹏.地震作用下土钉支护边坡稳定性分析[J].中国公路学报,2008,21(6):20-25.
[14]Nikolaou A,Mylonakis G,Gazetas G.Kinematics BendingMoments in Seismically Stressed Piles[R].New York:NCEER,1995.
[15]郭红仙,宋二祥,陈肇元.考虑施工过程的土钉支护土钉轴力计算及影响参数分析[J].土木工程学报,2008,40(11):78-85.
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