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Drained residual shear strength at effective normal stresses relevant to soil slope stability analyses

机译:与土质边坡稳定性分析有关的有效法向应力下的排水残余抗剪强度

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An extensive torsional ring shear testing program has been conducted to measure the drained residual shear strength of soils at the wide range of effective normal stress (10 to 700 kPa) usually mobilized in reactivated and first-time landslides. Soils, mudstones and shales of different plasticity and gradation were tested in the program. The effects of the change in nonlinearity of shear strength envelope over the utilized normal stress ranges on slope stability analyses were investigated. Using this data, new empirical residual shear strength correlations were developed as a function of soil index parameters and wide range of effective normal stresses. In essence, the correlations are presented as revised versions of those previously developed for a limited number of normal stresses utilizing the same soil index parameters. Comparisons were made with a considerable amount of back-calculated shear strength data reported in the literature for reactivated landslides as well as results predicted from existing shear strength correlations to verify the increased suitability of the new correlations for use in slope stability analyses. A numerical expression was also introduced to express the residual shear strength correlations for direct incorporation in slope stability software. (C) 2016 Elsevier B.V. All rights reserved.
机译:已经进行了广泛的扭转环剪切试验程序,以测量通常在重新活化和首次滑坡中动员的有效法向应力(10至700 kPa)的宽范围内土壤的排水残余剪切强度。在程序中测试了具有不同可塑性和等级的土壤,泥岩和页岩。研究了在所利用的法向应力范围内抗剪强度包络线的非线性变化对边坡稳定性分析的影响。利用这些数据,开发了新的经验残余抗剪强度相关性,作为土壤指标参数和有效法向应力的范围的函数。本质上,相关性是以前使用有限的正应力使用相同的土壤指数参数而开发的相关性的修订版本。与文献中报道的大量重新计算的滑坡抗剪强度数据以及现有抗剪强度相关性预测的结果进行了比较,以验证新的相关性在边坡稳定性分析中的适用性增加。还引入了一个数值表达式来表达残余抗剪强度相关性,以便直接并入边坡稳定性软件中。 (C)2016 Elsevier B.V.保留所有权利。

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