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Laboratory Evaluation of Horizontal Stress in Overconsolidated Sands

机译：超固结砂土中水平应力的实验室评估

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This paper describes a method for the determination of in situ horizontal stresses of heavily overconsolidated sands using a stress-path triaxial apparatus. This method was proposed by Garga and Khan (1991), who applied it to overconsolidated clays. The proposed method is based on the concept that if the radial stress exceeds the in situ horizontal stress while maintaining the axial stress constant and equal to the in situ vertical effective stress, only then will the specimen experience significant axial strain. In this investigation, the above method was applied to specimens of known stress histories of overconsolidated sand. Simulation of complex stress histories was carried out by subjecting the soil specimens to one and two cycles of loading in drained conditions (rate of loading or unloading: 0.05 kPa/min). It was found that the proposed method replicated the simulated in situ horizontal stress exactly. The technique is capable of estimating K_0 irrespective of the previously imposed stress history.
机译：本文介绍了一种使用应力路径三轴仪器确定严重超固结砂土原位水平应力的方法。这种方法是Garga和Khan（1991）提出的，他们将其应用于过固结的粘土。所提出的方法基于以下概念：如果径向应力超过了原位水平应力，同时保持轴向应力恒定并等于原位垂直有效应力，则只有这样，试样才会承受明显的轴向应变。在这项研究中，将上述方法应用于已知超固结砂土应力历史的标本。通过在排水条件下对土壤样本进行一到两个加载循环（加载或卸载速率：0.05 kPa / min）来进行复杂应力历史的模拟。结果发现，所提方法能够精确地复制模拟的原位水平应力。该技术能够估计K_0，而与先前施加的压力历史记录无关。

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