基于能量理论的土钉支护结构地震主动土压力计算方法研究
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摘要
地震作用下柔性支挡结构土压力的计算是个比较复杂的问题,其方法还不成熟且比较保守,为了能够比较准确合理地计算地震作用下土钉支护结构的主动土压力,以能量法和极限平衡法为基础,考虑土钉支护结构对地震土压力的影响,建立了滑动面为平面的地震主动土压力模型,推导了地震主动土压力的计算公式。结合工程实例,把公式与现有规范和方法的计算结果作比较,并进行参数分析,得到一些具有参考价值的结果。分析表明,公式计算的土压力值均比其它方法小,土钉的存在能够有效地减小地震作用下土体对支护结构的侧向压力,并使滑移面慢慢向墙后移动。通过算例验证,说明这种考虑土钉支护作用的计算方法更加合理,比较符合工程实际,为以后土钉支护结构的施工、优化和抗震设计提供参考。
The calculation of earth pressure of flexible retaining wall under earthquake ground motion is a complex problem,and the relevant method for calculating the earth pressure is still not mature and conservative.In order to calculate the active earth pressure of soil-nailing retaining structure under earthquake ground motion accurately and reasonably based on the energy method and the limit equilibrium method,a model for the seismic active earth pressure is established,in which the sliding surface is considered as a plane,and the formula is obtained considering the influence of the role of soil-nailing retaining structure on the earth pressure.Based on an engineering example,the results obtained from the above formula are compared with those obtained from the existing norms and methods,and parametric analysis is carried out,and then some practical results are obtained.The results show that the calculated earth pressures are smaller than those from other methods.The existence of soil nails can effectively reduce the lateral pressure of supporting structures under earthquake ground motions and make the sliding surface slowly move to the wall back.The proposed method considering the role of soil nailing is more reasonable and agrees with the actual engineering.It may provide some valuable references for the construction,optimization and anti-seismic design of soil-nailing retaining structures.
The calculation of earth pressure of flexible retaining wall under earthquake ground motion is a complex problem,and the relevant method for calculating the earth pressure is still not mature and conservative.In order to calculate the active earth pressure of soil-nailing retaining structure under earthquake ground motion accurately and reasonably based on the energy method and the limit equilibrium method,a model for the seismic active earth pressure is established,in which the sliding surface is considered as a plane,and the formula is obtained considering the influence of the role of soil-nailing retaining structure on the earth pressure.Based on an engineering example,the results obtained from the above formula are compared with those obtained from the existing norms and methods,and parametric analysis is carried out,and then some practical results are obtained.The results show that the calculated earth pressures are smaller than those from other methods.The existence of soil nails can effectively reduce the lateral pressure of supporting structures under earthquake ground motions and make the sliding surface slowly move to the wall back.The proposed method considering the role of soil nailing is more reasonable and agrees with the actual engineering.It may provide some valuable references for the construction,optimization and anti-seismic design of soil-nailing retaining structures.
引文
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[2]邱燕玲,姚令侃,秦伟.汶川地震路基挡墙震害特征分析[J].重庆交通大学学报(自然科学版),2010,29(4):576–581.(QIU Yan-ling,YAO Ling-kan,QIN Wei.Characteristicanalysis of the damaged retaining wall in Wenchuanearthquake[J].Journal of Chongqing Jiaotong University(Natural Science),2010,29(4):576–581.(in Chinese))
[3]许强,李为乐.汶川地震诱发大型滑坡分布规律研究[J].工程地质学报,2010,18(6):818–826.(XU Qiang,LIWei-le.Distribution of large-scale landslides induced by theWenchuan earthquake[J].Journal of Engineering Geology,2010,18(6):818–826.(in Chinese))
[4]王元战,李新国,陈楠楠.挡土墙主动土压力分布与侧压力系数[J].岩土力学,2005,26(7):1019–1022.(WANGYuan-zhan,LI Xin-guo,CHEN Nan-nan.Active earthpressure on a retaining wall and lateral coefficient of earthpressure[J].Rock and Soil Mechanics,2005,26(7):1019–1022.(in Chinese))
[5]王立峰.土钉墙面层土压力的计算分析[J].岩土力学,2010,31(5):1615–1626.(WANG Li-feng.Analysis of facing earthpressure in soil nailing walls[J].Rock and Soil Mechanics,2010,31(5):1615–1626.(in Chinese))
[6]曹振民.挡土墙填土曲线破裂面主动土压力分析[J].中国公路学报,1995,8(2):7–14.(CAO Zhen-min.Analysis ofactive earth pressure of back fill on retaining wall withcurved rupture surface[J].China Journal of Highway andTransport,1995,8(2):7–14.(in Chinese))
[7]梅国雄,宰金珉.考虑位移影响的土压力近似计算方法[J].岩土力学,2001,22(1):83–85.(MEI Guo-xiong,ZAIJin-min.Earth pressure calculating method consideringdisplacement[J].Rock and Soil Mechanics,2001,22(1):83–85.(in Chinese))
[8]BROWZIN B S.Anchored bulkheads horizontal and slopinganchors[J].J Geotech Engng Div Am Soc Civ Engrs,1981,107(GT5):629–645.
[9]HASHASH M A,WHITTLE A J.Mechanisms of load transferand arching for braced excavations in clay[J].2002,128(3):187–197.
[10]DESAI C S.A fundamental study of braced excavationconstruction[J].Comput Geotech,1977,8:39–64.
[11]徐日庆.考虑位移和时间的土压力计算方法[J].浙江大学学报,2000,34(4):370–375.(XU Ri-qing.Methods ofearth pressure calculation for excavation[J].Journal ofZhejiang University(Engineering Science),2000,34(4):370–375.(in Chinese))
[12]陈页开.挡土墙上土压力的试验研究与数值分析[D].杭州:浙江大学,2001.(CHEN Ye-kai.Model test andnumerical analysis of earth pressures on retaining wall[D].Hangzhou:Zhejiang University,2001.(in Chinese))
[13]朱彦鹏,罗晓辉,周勇.支挡结构设计[M].北京:高等教育出版社,2008.(ZHU Yan-peng,LUO Xiao-hui,ZHUYong.Retaining structure design[M].Beijing:HigherEducation Press,2008.(in Chinese))
[14]顾慰慈.挡土墙土压力计算[M].北京:中国建材工业出版社,2000.(GU Wei-ci.Calculating instructions of retainingwall[M].Beijing:China Building Material IndustryPublishing House,2000.(in Chinese))
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