The significant difference between the mechanical properties of soft rock and hard rock results in the complexity of the failure mode of the anti-dip layered slope with soft and hard rock interbedding.In order to reve...The significant difference between the mechanical properties of soft rock and hard rock results in the complexity of the failure mode of the anti-dip layered slope with soft and hard rock interbedding.In order to reveal the landslide mechanism,taking the north slope of Fushun West Open-pit Mine as an example,this paper analyzed the failure mechanism of different landslides with monitoring and field surveys,and simulated the evolution of landslides.The study indicated that when the green mudstone(hard rock)of the anti-dip slope contains siltized intercalations(soft rock),the existence of weak layers not only aggravates the toppling deformation of anti-dip layered slope with high dip,but also causes the shear failure of anti-dip layered slope with stable low dip.The shear failure including subsidence induced sliding and wedge failure mainly exists in the unloading zone of the slope.Its failure depth and failure time were far less than that of toppling failure.In terms of the development characteristics of deformation,toppling deformation has the long-term and progressive characteristics,but shear failure deformation has the abrupt and transient characteristics.This study has deepened the understanding of such slope landslide mechanism,and can provide reference for similar engineering.展开更多
基于软硬互层边坡的有限元模型,研究了边坡在近远场地震作用下的动力响应规律,得出远场地震对边坡动力响应(动力放大系数、最大剪应力和最大主应力)的影响总体比近场地震显著;通过将时程分析法与规范中的拟静力法计算的安全系数进行对比...基于软硬互层边坡的有限元模型,研究了边坡在近远场地震作用下的动力响应规律,得出远场地震对边坡动力响应(动力放大系数、最大剪应力和最大主应力)的影响总体比近场地震显著;通过将时程分析法与规范中的拟静力法计算的安全系数进行对比,明确了拟静力法在地震动力稳定性评价中的不足;基于有限元时程分析法计算出的边坡临界加速度代入Newmark滑块位移法公式中,得到了考虑地震近远场特性影响的边坡永久位移,并与弹塑性有限元数值模拟结果进行了对比,得出Newmark法计算结果偏小,且远场地震作用下的永久位移比近场地震作用下分别增大35%(Newmark法)和21%(弹塑性有限元法);最后基于Jibson and Michae提出的边坡稳定性评价的永久位移量进行了边坡的稳定性评价,得出以永久位移1 cm作为岩质边坡从一个轻度破坏到中度破坏程度的评价临界值较为合理。展开更多
基金supported by the National Key Research and Development Program of China(Nos.2022YFC2903902 and 2022YFC2903903)the National Natural Science Foundation of China(Nos.U1903216 and 52174070).
文摘The significant difference between the mechanical properties of soft rock and hard rock results in the complexity of the failure mode of the anti-dip layered slope with soft and hard rock interbedding.In order to reveal the landslide mechanism,taking the north slope of Fushun West Open-pit Mine as an example,this paper analyzed the failure mechanism of different landslides with monitoring and field surveys,and simulated the evolution of landslides.The study indicated that when the green mudstone(hard rock)of the anti-dip slope contains siltized intercalations(soft rock),the existence of weak layers not only aggravates the toppling deformation of anti-dip layered slope with high dip,but also causes the shear failure of anti-dip layered slope with stable low dip.The shear failure including subsidence induced sliding and wedge failure mainly exists in the unloading zone of the slope.Its failure depth and failure time were far less than that of toppling failure.In terms of the development characteristics of deformation,toppling deformation has the long-term and progressive characteristics,but shear failure deformation has the abrupt and transient characteristics.This study has deepened the understanding of such slope landslide mechanism,and can provide reference for similar engineering.
文摘基于软硬互层边坡的有限元模型,研究了边坡在近远场地震作用下的动力响应规律,得出远场地震对边坡动力响应(动力放大系数、最大剪应力和最大主应力)的影响总体比近场地震显著;通过将时程分析法与规范中的拟静力法计算的安全系数进行对比,明确了拟静力法在地震动力稳定性评价中的不足;基于有限元时程分析法计算出的边坡临界加速度代入Newmark滑块位移法公式中,得到了考虑地震近远场特性影响的边坡永久位移,并与弹塑性有限元数值模拟结果进行了对比,得出Newmark法计算结果偏小,且远场地震作用下的永久位移比近场地震作用下分别增大35%(Newmark法)和21%(弹塑性有限元法);最后基于Jibson and Michae提出的边坡稳定性评价的永久位移量进行了边坡的稳定性评价,得出以永久位移1 cm作为岩质边坡从一个轻度破坏到中度破坏程度的评价临界值较为合理。
