岩土工程边坡稳定性分析中的拉伸破坏问题

发布时间：2018-04-19 22:06

本文选题：边坡工程 + 拉伸破坏　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：应用FLAC~(3D)数值软件结合强度折减法,分别定义2种破坏准则来考虑拉伸破坏和不考虑拉伸破坏,并根据对比分析原理,模拟2种典型类型的边坡——均质土坡和含有节理的岩坡在不同的坡高、坡角、节理倾角情况下的稳定性问题,以探讨是否需要考虑拉伸破坏,以及在何种条件下必须考虑,影响程度如何。模拟结果显示,在采用连续介质力学与理想弹塑性模型来模拟滑坡问题时,是否考虑拉伸破坏对均质土坡稳定性影响不大,但对于模拟节理岩坡滑动的影响不可忽略。考虑抗拉强度准则之后,岩土边坡安全系数偏于保守。对于稳定性越好的边坡,进行失稳分析时,拉伸破坏对安全系数的计算影响越大。同时在岩质边坡节理的倾角接近水平和竖直时,只有在考虑拉伸破坏时才可以更加真实合理地模拟出边坡的破坏区以及剪切滑动面。采用定义的2种破坏准则分析意大利阿勒颇露天矿山滑坡问题,验证上述研究结论。最后,对数值模拟方法、本构模型、孔隙水压等对边坡稳定性模拟分析的影响进行讨论。
[Abstract]:In this paper, two kinds of failure criteria are defined to consider tensile failure and non-consideration of tensile failure by using FLACU 3D numerical software combined with strength reduction method, and according to the principle of comparative analysis, two kinds of failure criteria are defined to consider tensile failure and not to consider tensile failure. To simulate the stability problems of two typical types of slope-homogeneous soil slope and rock slope with joints at different slope heights, angles, and dip angles of joints, in order to explore whether tensile failure needs to be considered and under what conditions it must be considered, What is the degree of influence? The simulation results show that, when using continuum mechanics and ideal elastic-plastic model to simulate landslide, the effect of tensile failure on stability of homogeneous soil slope is not significant, but the influence of simulating slip of jointed rock slope can not be ignored. Considering the criterion of tensile strength, the safety factor of rock slope is conservative. For the slope with better stability, the influence of tensile failure on the calculation of safety factor is greater. At the same time, when the slope angle of rock slope is close to horizontal and vertical, only when tensile failure is considered can the failure zone and shear sliding surface of rock slope be simulated more realistically and reasonably. The landslide problem of open pit mine in Aleppo, Italy, is analyzed by two damage criteria, and the above conclusions are verified. Finally, the effects of numerical simulation method, constitutive model and pore water pressure on slope stability are discussed.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;大连理工大学土木工程学院;大连理工大学岩石破裂与失稳研究所;
【基金】：国家重点基础研究发展计划(973)项目(2014CB047100) 国家自然科学基金资助项目(51274053)~~
【分类号】：TU43

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