基于有限单元法的超软土地基河道边坡稳定分析
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摘要
文中利用有限单元法对某围垦区超软土地基河道的边坡稳定性进行了模拟分析,利用强度折减法分析了边坡失稳状态下的应力、位移及边坡的破坏形态。并将计算结果与瑞典圆弧法及简化毕肖普法计算结果进行了对比。结果表明,软土地基河道失稳时滑裂面近似为圆弧,滑裂面穿过河底,滑弧深度大,边坡破坏属于深层破坏,有限元方法计算得到的滑裂面形状、滑弧半径和稳定安全系数均与简化毕肖普法接近,设计过程中采用毕肖普法能得到较为满意的结果。
In this paper, the finite element method based on ABAQUS is used to simulate and analyze the slope stability of the river course with ultra-soft soil foundation in some a certain reclamation area and the strength reduction method is used to analyze the stress and displacement under the instability state and the failure mode of the slope. This result are compared with the calculation results obtained by the Swedish arc method and the simplified Bishop method. The results show that the slip surface is approximately circular when the river with soft soil foundation is unstable, the slip surface passes through the bottom of the river, the depth of the sliding arc is large, and the slope damage belongs to the deep damage. The shape of the slip surface, the radius of the sliding arc and the stability safety factor calculated by the finite element method are close to the simplified Bishop method. The more satisfactory results are obtained by the Bishop method in the design process.
In this paper, the finite element method based on ABAQUS is used to simulate and analyze the slope stability of the river course with ultra-soft soil foundation in some a certain reclamation area and the strength reduction method is used to analyze the stress and displacement under the instability state and the failure mode of the slope. This result are compared with the calculation results obtained by the Swedish arc method and the simplified Bishop method. The results show that the slip surface is approximately circular when the river with soft soil foundation is unstable, the slip surface passes through the bottom of the river, the depth of the sliding arc is large, and the slope damage belongs to the deep damage. The shape of the slip surface, the radius of the sliding arc and the stability safety factor calculated by the finite element method are close to the simplified Bishop method. The more satisfactory results are obtained by the Bishop method in the design process.
引文
[1]费康,张建伟. ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010.
[2]GB50286-2013,堤防工程设计规范[S].北京:中华人民共和国住房和城乡建设部,2012.
[3]陈仲颐,周景星,王洪谨.土力学[M].北京:清华大学出版社,2007.
[4]曹娜.含软弱夹层的岩质边坡稳定性分析[J].水利规划与设计,2018(03):109-113.
[2]GB50286-2013,堤防工程设计规范[S].北京:中华人民共和国住房和城乡建设部,2012.
[3]陈仲颐,周景星,王洪谨.土力学[M].北京:清华大学出版社,2007.
[4]曹娜.含软弱夹层的岩质边坡稳定性分析[J].水利规划与设计,2018(03):109-113.