Correlation of large displacement drained shear strength of landslide soils measured by direct shear and ring shear devices
Correlation of large displacement drained shear strength of landslide soils measured by direct shear and ring shear devices
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DOI：
10.1007/s10346-011-0301-9
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发表时间：
2012-09-01
期刊：
影响因子：
6.7
通讯作者：
Kimura, Sho
中科院分区：
文献类型：
--
作者：
Vithana, Shriwantha Buddhi;Nakamura, Shinya;Kimura, Sho
通过对五种滑坡土的重塑、预切割和抛光试件的排水直剪试验以及未切割和重塑滑面材料试件的排水环剪试验的室内研究，提出了动员抗剪强度参数、粘聚力（c，c（r））和内摩擦角（I断裂竖杆，I断裂竖杆（r））之间的显着相关性。调查的土壤由属于凝灰质粘土、泥岩、黄土和粉砂岩的滑面材料组成。先前大多数关于通过反向直剪和环剪装置测量残余剪切强度的研究都使用这两种装置获得了显着不同的结果，即使在直剪装置中使用预切割和抛光的试样时也是如此。在这项研究中，通过环剪切装置测量的重塑样本的残余剪切强度值与重塑样本的排水大位移剪切强度值显着相关，后者是在直接剪切装置中使用预切割和抛光样本测量的。两个剪切装置中测得的内聚力之间的相关性由线性关系 表示，而两个装置中测得的摩擦角之间的相关性由线性关系 表示。所提出的有效内聚力 (c') 和有效摩擦角（I 折断竖杆'）的线性相关性在 30-150 kN/m(2) 的有效法向应力范围内产生了显着的确定系数。
Based on a laboratory study of drained direct shear tests of remoulded, pre-cut and polished specimens and drained ring shear tests of uncut and remoulded specimens of slip surface materials of five landslide soils, significant correlations of the mobilized shear strength parameters, cohesion (c, c (r)) and internal friction angle (I broken vertical bar, I broken vertical bar(r)), are proposed. The investigated soils consisted of the slip surface material belonging to tuffaceous clay, mudstone, loess and siltstone. Most of the previous studies on residual shear strength measured by reversal direct shear and ring shear devices have obtained significantly different results using the two devices, even when pre-cut and polished specimens were used in the direct shear device. In this study, the residual shear strength values of remoulded specimens measured by a ring shear device are shown to significantly correlate with the drained large displacement shear strength values of remoulded specimens, which were measured using pre-cut and polished specimens in a direct shear device. The correlation between the cohesion measured in the two shear devices is expressed by the linear relationship, , while the correlation between the friction angle measured in the two devices is expressed by the linear relationship, . The proposed linear correlations for effective cohesion (c') and effective friction angle (I broken vertical bar') have yielded significant coefficients of determination within an effective normal stress range of 30-150 kN/m(2).