基于BARTON-BANDIS本构模型的节理岩体边坡稳定性离散元模拟分析

Stability analysis of jointed rock slopes with the Barton-Bandis constitutive model by discrete element method

摘要:

利用离散元对节理岩体工程进行稳定性模拟分析时，节理的本构关系对模拟结果有重要的影响，详细的介绍了基于离散元UDEC软件，利用Barton-Bandis (BB)和Mohr-Coulomb(MC)两种本构模型分析节理岩体边坡稳定性的主要区别。在BB模型中，由于膨胀角随剪切运动呈非线性变化，分析节理岩体边坡所得到的运动规律与现场监测数据所反映的边坡运动规律一致，因此，离散元中BB模型更适合用来分析节理岩体工程。根据BB模型模拟分析的结果，对依托工程边坡采取了喷射厚度10 cm混凝土进行加固的措施，模拟结果表明，喷射10 cm混凝土对边坡稳定性起到了良好的加固作用，依托工程正是按此加固方案进行施工。

Abstract:

Distinct element simulation in jointed rock masses is largely dependent upon the joint constitutive equations. Based on UDEC numerical simulation software, this paper detail describes the differences between the Barton-Bandis (BB) and the Mohr-Coulomb (MC) joint constitutive models when each model is applied to the stability analysis of the jointed rock slopes. The BB model, which allows the dilation accompanying the shear movements, can predict a good slope motion law consistent with field monitoring, therefore, the BB model is more suitable for analysising jointed rock projects. Consequently the 10 cm thick shotcrete was proposed for the reinforcement of this rock slope from the result of the BB model simulation, the result showed that proposition for the reinforcement of the slope was proved appropriate reinforcement method, the jointed rock slope is constructing according to this reinforcement method.