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Numerical simulation of experimentally shear-tested contact specimens from existing dam joints
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.compgeo.2020.103630
Sylvain Renaud , Najib Bouaanani , Benjamin Miquel

Abstract This paper first proposes an original procedure to implement three-dimensional (3D) surfaces of rough existing unbonded contact specimens, i.e. fully open with no chemical bond, into non-linear finite element models to numerically simulate shear tests conducted under Constant Normal Load (CNL) conditions. The developed procedure is applied to 18 contact specimens drilled from concrete, concrete-rock, and rock joints of existing dams. A total of 83 finite element models of the contact interfaces are generated and the results of the numerical simulations are analyzed and validated against corresponding experimental findings. Sensitivity analyses are conducted and highlight, among other things, that the geometric resolution must be selected with caution and that mismatch due to initially unmated conditions or differences between the geometries of the lower and upper contact faces must be considered. A practical non-linear shear strength criterion is also proposed and compared to numerical results. The results presented confirm the major role of roughness and matching properties in the shear response of dam joints. Finally, values of apparent cohesion and friction angle are suggested and applied to dam stability assessment while accounting for joint roughness and matching properties to emphasize the efficiency and relevance of such practice.

中文翻译:

现有大坝接缝试验剪切试验接触试样的数值模拟

摘要 本文首先提出了一种原始程序,将粗糙的现有未结合接触试样的三维 (3D) 表面,即完全开放的无化学键,转化为非线性有限元模型,以数值模拟在恒定法向载荷下进行的剪切试验。 CNL) 条件。开发的程序适用于从现有大坝的混凝土、混凝土-岩石和岩石接头钻取的 18 个接触试样。总共生成了 83 个接触界面的有限元模型,并对数值模拟的结果进行了分析,并根据相应的实验结果进行了验证。进行敏感性分析并强调,除其他外,必须谨慎选择几何分辨率,并且必须考虑由于最初未配对的条件或上下接触面的几何形状之间的差异而导致的不匹配。还提出了一个实用的非线性剪切强度准则并与数值结果进行了比较。所呈现的结果证实了粗糙度和匹配特性在坝节剪切响应中的主要作用。最后,建议表观黏聚力和摩擦角的值并将其应用于大坝稳定性评估,同时考虑接头粗糙度和匹配特性,以强调这种做法的效率和相关性。所呈现的结果证实了粗糙度和匹配特性在坝节剪切响应中的主要作用。最后,建议表观黏聚力和摩擦角的值并将其应用于大坝稳定性评估,同时考虑接头粗糙度和匹配特性,以强调这种做法的效率和相关性。所呈现的结果证实了粗糙度和匹配特性在坝节剪切响应中的主要作用。最后,建议表观黏聚力和摩擦角的值并将其应用于大坝稳定性评估,同时考虑接头粗糙度和匹配特性,以强调这种做法的效率和相关性。
更新日期:2020-09-01
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