基于倾斜变形的边坡临界滑动面确定方法研究
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1.贵州紫望高速公路建设有限公司;2.石家庄铁道大学;3.盘州市水务局

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TU457

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国家自然科学基金项目(NO.51709176);贵州省科技支撑计划项目(NO.2019[2883])


Study on determination method of slope critical slip surface based on inclined deformation
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Guizhou Ziwang Expressway Co. Ltd

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    摘要:

    采用强度折减法寻找三维边坡临界滑动面是边坡稳定性分析工作中的重要问题。本文基于对边坡临界状态位移场的分析,提出一种三维边坡临界滑动面的确定方法,即认为当边坡处于临界状态时,滑动面上的点是空间倾斜角度最大的位置点。通过强度折减计算使边坡达到临界状态,沿边坡表面及坡体内部等距布置测线和离散点,并计算各离散点的空间倾斜角度,提取每条测线上离散点空间倾斜角度最大值的坐标点;然后利用局部加权回归散点平滑方法做平滑处理,并将曲面在边坡范围外的多余部分进行裁剪即可得到三维边坡的临界滑动面。最后,探讨了倾斜变形计算长度大小和离散点布置的疏密程度对滑动面的影响,结果表明,倾斜变形计算长度对滑动面形状影响较小,离散点间距对滑动面形状存在一定的影响。

    Abstract:

    It is an important problem in slope stability analysis to find three-dimensional critical slip surface by strength reduction method. Based on the analysis of slope critical state displacement field, a method for determining three-dimensional slope critical slip surface is proposed in this paper, that is, when the slope is in critical state, the point on the slip surface is the position point with the largest spatial inclination Angle. The slope reaches the critical state by strength reduction calculation. The measuring line and discrete points are arranged equidistant along the slope surface and inside the slope body, and the spatial inclination Angle of each discrete point is calculated, and the coordinate point of the maximum spatial inclination Angle of discrete points on each measuring line is extracted. Then the local weighted regression scatterpoint smoothing method is used to smooth the surface, and the redundant part of the surface outside the slope is trimmed to obtain the critical sliding surface of the slope. Finally, the influence of the calculated length of the inclined deformation and the density of the discrete points on the sliding surface is discussed. The results show that the calculated length of the inclined deformation has little influence on the shape of the sliding surface, and the distance of the discrete points has a certain influence on the shape of the sliding surface.

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菅永明,屈晓英,袁维,等. 基于倾斜变形的边坡临界滑动面确定方法研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-21
  • 最后修改日期:2022-05-03
  • 录用日期:2022-05-05
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