This study examines the role of boundary friction in promoting heterogeneous compaction in soft rock specimens loaded at relatively high confining pressures outside the domain of compaction localization. An elastoplastic constitutive model characterized by tunable hardening/softening behaviour is used to conduct the analyses. Finite element simulations suggest that material instability is a non-necessary condition for the emergence of compaction fronts. Such fronts propagated as a result of a severe deviation in the local responses induced by frictional constraints. These findings suggest that boundary effects can bias the assessment of the extent of the compaction localization domain. Experimental countermeasures and informed model calibration procedures are therefore necessary to minimize such bias and enable more accurate predictions of soft rock compaction.

中文翻译：

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摩擦边界引起的压实带前沿的模拟

这项研究检验了边界摩擦在促进压实定位域外相对较高的围压下加载的软岩标本中非均质压实中的作用。以可调节的硬化/软化行为为特征的弹塑性本构模型用于进行分析。有限元模拟表明，对于压实前沿的出现，材料不稳定性是不必要的条件。由于摩擦约束引起的局部响应的严重偏差，这种前沿传播了。这些发现表明边界效应可能会使压实定位域范围的评估产生偏差。