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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Determination of traffic-load-influenced depths in clayey subsoil based on the shakedown concept
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Determination of traffic-load-influenced depths in clayey subsoil based on the shakedown concept

机译：基于减震概念的黏土底土交通荷载影响深度确定

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摘要

The determination of the depth of traffic load influence is significant for pavement and embankment design on soft soil. In this study, a method based on strain-controlled criteria is presented to estimate the depths within which the behavior of a saturated clayey subsoil is affected by cyclic traffic loads. Based on the shakedown concept, the following depths of influence can be defined: (1) the threshold depth, beyond which the dynamic effect of the traffic loads is insignificant; (2) the plastic shakedown limit depth, within which the subsoil experiences noticeable and continuous deformation; and (3) the critical failure depth, within which the soil fails due to the accumulation of strain. This method for determining the depths of influence is advantageous because it is applicable to various soil types. The data required for this method consist of vertical stress responses along the soil profile and three cyclic stress limits of the soil. Based on the development of pore pressure and the dynamic strain behaviors during undrained cyclic triaxial tests, the following cyclic stress limits of the soft clay subsoil are determined: a threshold cyclic stress ratio CSRt of 0.03, a plastic shakedown limit stress ratio CSRp of 0.33 and a critical cyclic stress ratio CSRc of 0.44. These cyclic stress limits are used to determine the corresponding depths of influence, which are then used to implement ground improvements and strengthen the dynamic carrying capacity of the road structures. (C) 2015 Elsevier Ltd. All rights reserved.
机译：确定交通荷载影响深度对软土路面和路堤设计具有重要意义。在这项研究中，提出了一种基于应变控制准则的方法来估计饱和黏土底土的行为受周期性交通荷载影响的深度。基于合并的概念，可以定义以下影响深度：（1）阈值深度，超过此阈值交通负载的动态影响不明显； （2）塑性沉降极限深度，在该深度范围内，土层会发生明显且连续的变形； （3）临界破坏深度，在该深度范围内土壤由于应变的积累而破坏。这种确定影响深度的方法是有利的，因为它适用于各种土壤类型。该方法所需的数据包括沿土壤剖面的垂直应力响应和土壤的三个循环应力极限。根据不排水循环三轴试验过程中孔隙压力的变化和动应变行为，确定了软粘土地基的以下循环应力极限：阈值循环应力比CSRt为0.03，塑性减振极限应力比CSRp为0.33，临界循环应力比CSRc为0.44。这些循环应力极限用于确定相应的影响深度，然后将其用于实施地面改良并增强道路结构的动态承载能力。 （C）2015 Elsevier Ltd.保留所有权利。

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