边坡稳定分析条块力-位移法及其应用

发布时间：2018-05-01 08:13

本文选题：条块力-位移分析法 + 渐近破坏稳定分析　；参考：《岩土力学》2015年10期

【摘要】：在现行条分法的基础上,建立了一种全新的边坡条块力-位移分析方法。现行条分法中条块底边的力学参数采用极限平衡状态力学参数,即每个条块底边均处于极限平衡状态,这种极限平衡状态对于残余应力是较为适宜的。采用理想弹塑性模型和一种全新的本构模型描述土条块底边力学特性,并以不平衡推力法为例,提出了临界状态条块的确定方法,针对可能的破坏模式进行了分析,并提出了边坡整体破坏各条块的应力和位移的确定方法,计算出相应的稳定系数,如传统强度折减法、综合下滑力-抗滑力法、主推力法、综合位移法和富余位移法稳定系数。通过计算分析论证了理想弹塑性模型在不改变力学参数的情况下是难以描述边坡渐近破坏过程的,而一种全新的本构模型可以描述渐近破坏各条块的力学行为。提出的条块力-位移法可以确定边坡在不同荷载和位移条件下的稳定性,也可以获得边坡的推力变化和滑面移动特征,进而实施边坡的应力、位移和稳定性的初步预测预报。
[Abstract]:On the basis of the existing strip method, a new method of stress displacement analysis of slope strip is established. In the current strip method, the mechanical parameters of the bar and bottom edge are in the limit equilibrium state, that is, the bottom side of each block is in the limit equilibrium state. This limit equilibrium state is more suitable for the residual stress. The plastic model and a new constitutive model describe the mechanical properties of the bottom edge of the soil strip, and take the unbalance thrust method as an example, the method of determining the critical state bar is put forward, the possible failure mode is analyzed, and the method of determining the stress and displacement of each block of the whole slope is put forward, and the corresponding stability coefficient is calculated. For example, the traditional strength reduction method, comprehensive sliding force anti sliding force method, main thrust method, comprehensive displacement method and surplus displacement method stability coefficient. Through calculation and analysis, it is proved that the ideal elastoplastic model is difficult to describe the slope asymptotic failure process without changing the mechanical parameters, and a new constitutive model can describe the asymptotic failure of each model. The mechanical behavior of the blocks is proposed. The proposed bar force displacement method can determine the stability of the slope under different load and displacement conditions, and can also obtain the thrust variation and sliding surface movement characteristics of the slope, and then carry out the preliminary prediction and prediction of the stress, displacement and stability of the slope.

【作者单位】：湖北工业大学土木工程与建筑学院;三峡库区地质灾害防治工作指挥部;
【基金】：国家基金面上项目(No.41372363)
【分类号】：TU43

【参考文献】