强地震作用下深基坑支护体系灾变破坏过程数值模拟
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摘要
通过对地震作用下地下连续墙加钢支撑的基坑支护结构的稳定性进行三维动力有限元模拟,研究了基坑支护结构形式及其结构失稳、灾变破坏过程及时程特性、结构对地震波传播方向的敏感性,及其振动引起位移的空间分布特性.结果表明:在强地震作用下,基坑支护结构在极短时间(t≤10 s)内可以产生灾变破坏;地震波传播方向对结构体系的稳定性具有显著影响,其最不利的角度为轴向30°~40°;结构地震反应强度具有明显的区域分布特性.
Based on the character of typical foundation pit support structure and method in gravel stratum,by establishing reasonable 3-D seismic response analysis numerical simulation,adopting LS-DYNA software,this paper studied the stability,disability mutation process and time-dependence characteristic of foundation pit and continuous concrete wall with steel support under intense earthquake action.The results show that failure happens in very short time;propagation direction of the seismic wave has a great influence on the structure stability,the least favorable angle is 30°-40°.
Based on the character of typical foundation pit support structure and method in gravel stratum,by establishing reasonable 3-D seismic response analysis numerical simulation,adopting LS-DYNA software,this paper studied the stability,disability mutation process and time-dependence characteristic of foundation pit and continuous concrete wall with steel support under intense earthquake action.The results show that failure happens in very short time;propagation direction of the seismic wave has a great influence on the structure stability,the least favorable angle is 30°-40°.
引文
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[3]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.ZHU Yan-peng,LI Zhong.Improvement on stabilityanalysis of soil nailing in foundation excavations and itssoftware development[J].Chinese Journal of Geotechni-cal Engineering,2005,27(8):939-943.
[4]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.
[5]梁仕华.土钉支护结构的极限分析法及大变形固结有限元理分析[D].杭州:浙江大学建筑工程学院,2004.
[6]Brown P,Booker J R.Finite element analysis of exca-vation[J].Computers and Geotechnics,1998,l(3):207-220.
[7]Hsi J P,Small J C.Simulation of excavation in anelastic-plastic material and analysis method[J].Geomech,1992,16(1):123-134.
[8]Leger P,Dussult S.Seismic-energy dissipation inMDOF structures[J].ASCE,1992,118(5):113-124.
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