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首页> 外文期刊>Quaternary International >Stress-strain-time numerical modelling of a deep-seated gravitational slope deformation: Preliminary results
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Stress-strain-time numerical modelling of a deep-seated gravitational slope deformation: Preliminary results

机译：深部重力斜坡变形的应力-应变-时间数值模拟：初步结果

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An analysis of the effects of creep on the development of a deep-seated gravitational slope deformation (DSGSD), carried out by numerical modelling, is described. The slope rock mass evolution has been simulated applying different creep rheological models.rnThe studied DSGSD is located in the Central Italian Alps (Val S. Giacomo). It is characterised by three main scarps, different sets of tensile trenches, and counterscarps, mapped during a detailed geomorphological survey. The mechanical behaviour of the rock masses, in terms of elasto-plastic parameters, has been defined on the base of laboratory and in situ tests. In order to simulate this instability process, a stress-strain-time numerical modelling has been performed by a finite-difference numerical code (Fast Lagrangian Analysis of Continua-FLAC). The effects of different constitutive model laws have been considered: the visco-elastic Maxwell model; the visco-elastic Burger model and the elasto-visco-plastic Burger model. The modelling has been performed simulating the melting of the ancient glacier, starting from its maximum load. Because of the difficulty to determine rock mass creep parameters, for each of the rheological models, a sensitivity analysis has been performed, varying the physical-mechanical properties. The visco-elasto-plastic model allows to underline the formation of shear surface showing a depth and a shape in good agreement with the morphologic features of the slope. The only action of unloading due to glacier melting seems to be insufficient to generate deep critical surfaces which can be related with the formation of the DSGSD.
机译：描述了通过数值建模对蠕变对深层重力斜坡变形（DSGSD）发育的影响的分析。已使用不同的蠕变流变模型对边坡岩体演化进行了模拟。研究的DSGSD位于意大利中部阿尔卑斯山（Val S. Giacomo）。它的特征是在详细的地貌勘测过程中绘制了三个主要的陡坡，不同组的张沟和counter树。根据弹塑性参数，已经在实验室和现场测试的基础上定义了岩体的力学行为。为了模拟这种不稳定性过程，已经通过有限差分数值代码（Continua-FLAC的快速拉格朗日分析）进行了应力-应变-时间数值建模。已经考虑了不同本构模型定律的影响：粘弹性麦克斯韦模型；粘弹汉堡模型和弹黏粘汉堡模型。从最大的负荷开始，已经进行了模拟，模拟了古代冰川的融化。由于难以确定岩体蠕变参数，因此对于每种流变模型，都已进行了敏感性分析，从而改变了物理机械性能。粘弹塑性模型可以强调剪切面的形成，该剪切面的深度和形状与斜坡的形态特征非常吻合。由于冰川融化而导致的唯一卸载作用似乎不足以产生深层的临界表面，而深层的临界表面可能与DSGSD的形成有关。

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