摘要:
滑坡推力计算方法可以概括为传递系数法、刚体极限平衡分析方法和有限元数值法等三类。传递系数法被工程技术人员所广泛应用,但随着滑(边)坡稳定性分析计算理论的发展,传统传递系数法有将逐步被先进而更实用的方法所取代的趋势;Morgenstern-Price法为刚体极限平衡分析方法的代表之一,这类方法在滑动面出现反坡段时计算结果偏于不合理;有限元数值法在模拟路堑开挖边坡时应追踪实际的应力场变化过程、依序建模,才能更符合工程实际,有限元数值法能同时得到滑坡推力与桩身内力图,比"K"法优越之处为能反映出由岩土本身性质的差异所造成的滑面下桩侧应力值差异。对比分析结果显示,有限元数值法进行滑坡推力计算结果较为合理,有必要进一步分析研究与推广应用。
Abstract:
According to the relative mechanical relation of anti-slide and retaining structure to the reinforced landslide,the classification to calculation methods of landslide thrust may be described as the coefficient transfer method,Morgenstern-Price method(rigid body limit equilibrium method)and the FEM.The coefficient transfer method has been widely used for engineering practice,and it would certainly be replaced by advanced and practical methods with the development of slope stability calculation theory.Under the condition of negative direction segment appeared in landslide,the limited equilibrium method such as Morgenstern-Price can not get reasonable result.When using the coupled FEM to simulate cutting slope,the change of stress field of cutting slope should be tracked.Through order simulation,the reasonable result could be got.The FEM can get both the landslide thrust and internal force of the pile.The FEM is better than "K"method for FEM can reflects the difference of stress distribution below slip surface due to the difference of rock or soil property.Presented by the comparative analysis,using the FEM to calculate the landslide thrust can get reasonable result,it can be widely used in engineering practice.
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