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A new superlinear viscoplastic shear model for accelerated rheological deformation

机译：加速流变变形的新超线性粘塑性剪切模型

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摘要

The rheological properties of rocks are closely related to long-term stability and safety in geotechnical engineering. After analysing the shear rheological test curve of granite samples taken from the mining slope in the Bangpu Mining Area of Tibet, a superlinear viscoplastic model (named the SLVP model) is developed based on the constitutive Nishihara model. It is found that the SLVP model can satisfactorily describe the three shear Theological stages of the granite and fit the rock properties in the accelerated rheological stage. For the 1-1 profile of the slope excavated in the Bangpu Mining Area of Tibet, stabilities of the excavated slope are calculated and analysed. The results show that, at the middle-upper step and the toe of the excavated slope, the displacement and the plastic zone are considerably different for cases with and without rheological deformation. The maximum displacement considering rheological deformation is 14.1 times greater than that without Theological deformation. The slope is not stable in general and serious failure at the excavated slope is possible. Early warning measures should be taken and the middle-upper step and the toe areas of the excavated slope should be strengthened, and the early warning and monitoring measures should be taken in relevant areas.
机译：岩石的流变特性与岩土工程的长期稳定性和安全性密切相关。在分析了西藏邦浦矿区矿山边坡花岗岩样品的剪切流变试验曲线后，基于本构西原模型建立了超线性粘塑性模型（称为SLVP模型）。发现SLVP模型可以令人满意地描述花岗岩的三个剪切流变学阶段，并在加速流变阶段拟合岩石特性。针对西藏邦浦矿区开挖边坡的1-1剖面，计算并分析了开挖边坡的稳定性。结果表明，在有流变变形和无流变变形的情况下，在中上台阶和开挖边坡的趾部，位移和塑性区都存在很大差异。考虑到流变变形的最大位移是没有流变变形的最大位移的14.1倍。斜坡通常不稳定，开挖的斜坡可能会发生严重破坏。应采取预警措施，加强开挖斜坡的中上台阶和趾部区域，并在有关区域采取预警和监测措施。

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