土坡中基于位移突变失稳判据的一种改进方法
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摘要
鉴于目前边坡失稳准则的多样性及其不确定性,如何选择或提出一种既能满足工程需要又能便于应用的失稳判定准则显得尤为重要。首先分析讨论了目前三种较常用的失稳判定准则,然后在位移突变判据的基础上提出了一种改进的失稳判定方法,该方法通过绘制边坡最大水平位移增量与折减系数增量的比值△S/△F跟折减系数Fs的关系曲线来确定边坡安全系数,并通过简化的实例模型证明了其适用性。
Due to the existing variety and uncertainty of the unstability criterion for slope analysis,it's especially important to choose or propose an unstability criterion,which can not only meet with engineering need but also can facilitate its application.Three popular criterions have been analysed and discussed,and then an improved method based on the criterion of displacement saltation has been proposed.The new criterion can obtain its safety factor by plotting the curve of △S/△F — Fs.Its applicability has been proved through simplified engineering samples.
Due to the existing variety and uncertainty of the unstability criterion for slope analysis,it's especially important to choose or propose an unstability criterion,which can not only meet with engineering need but also can facilitate its application.Three popular criterions have been analysed and discussed,and then an improved method based on the criterion of displacement saltation has been proposed.The new criterion can obtain its safety factor by plotting the curve of △S/△F — Fs.Its applicability has been proved through simplified engineering samples.
引文
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[2]格里菲思.D.V,雷恩.P.A.有限元边坡稳定性分析[J].土工学,1999,49(3):387-403.(Griffiths DV,Lane P A.Slope stability analysis by finite ele-ments[J].Geotechnique,1999,49(3):387-403.(inChinese))
[3]道森.E.M,罗斯.W.H.基于强度折减法的边坡稳定性分析[J].土工学,1999,49(6):835-840.(Dawson E M,Roth W H.Slope stability analysis bystrength reduction[J].Geotechnique,1999,49(6):835-840.(in Chinese))
[4]沃恩.F.S.有限元分析边坡稳定的不确定性[J].计算机与结构,1984,19:777-791.(Wong F S.Un-certainties in FEM modeling of slope stability[J].Computer&Structures,1984,19:777-791.(in Chi-nese))
[5]第6回日本地震工学,1982:921-928.(Tamura C,Han G C,Kato K.基于沙质土坝的一种振动失效研究[J].第6回日本地震工学,1982:921-928.(Tamura C,Han G C,Kato K.A study on vibrationfailure mechanism of sand models of fill type dam[J].
[6]宋二祥.土工结构安全系数的有限元计算[J].岩土工程学报,1997,19(2):1-7.(SONG Erxiang.Calcu-lation of total factor of safety of Geotechnic structureby FEM[J].Chinese journal of Geotechnical engi-neering,1997,19(2):1-7.(in Chinese))
[7]吕擎峰.土坡稳定性分析研究[D].河海大学博士论文,2005.(Lv Qingfeng.Study on method of soilslope stability analysis[D].Dissertation of HoHai U-niversity for the doctor degree of engineering,2005.(in Chinese))
[8]张鲁渝,时卫民,郑颖人.平面应变条件下土坡稳定有限元分析[J].岩土工程学报,2002,24(4):487-490.(ZHANG Luyu,SHI Weimin,ZHENG Yingren.The slope stability analysis by FEM under the planestrain condition[J].Chinese Journal of GeotechnicalEngineering,2002,24(4):487-490.(in Chinese))
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