初始剪应力下剪切方向角对软黏土软化特性的影响

发布时间：2018-02-28 22:33

  本文关键词： 土力学 循环单剪 初始剪应力 剪切方向角 软化指数　出处：《岩石力学与工程学报》2016年05期 　论文类型：期刊论文

【摘要】：边坡、挡土墙等结构中的土体一般存在初始剪应力的作用,同时在地震、波浪等动荷载作用下,土体的初始剪应力与动荷载之间往往会存在一定的夹角。为了研究初始剪应力与循环荷载之间的夹角(剪切方向角)对土体软化指数的影响,采用多向循环单剪仪对温州软黏土进行一系列的循环单剪试验研究。研究结果表明,在特定剪切方向角下,随着循环应力比rc的增加,软化指数?逐渐降低,且在相同软化指数条件下,相邻循环应力比对应的循环圈数相差的幅度逐渐减小;循环应力比一定时,当剪切方向角在0°~90°范围内增加时,软化指数依次递增,当90°θ≤180°时,软化指数的变化趋势与0°~90°时相反;循环应力比rc=0.15时,在加载初期,θ=120°,150°,180°时,软化指数均分别较θ=60°,30°,0°时大。对试验数据进行回归分析,建立土体的软化指数模型和孔压 软化模型。
[Abstract]:The soil mass in slope, retaining wall and other structures generally has the function of initial shear stress, at the same time, under the action of earthquake, wave and other dynamic loads, In order to study the influence of the angle between initial shear stress and cyclic load (shear direction angle) on the softening index of soil, there is always a certain angle between initial shear stress and dynamic load. A series of cyclic single shear tests on Wenzhou soft clay were carried out by using a multidirectional cyclic single shear apparatus. The results show that the softening exponent increases with the increase of cyclic stress ratio (RC) at a specific shear direction. Under the condition of the same softening index, the amplitude of cycle cycle number difference between adjacent cyclic stress ratio decreases gradually, and when the cyclic stress ratio is fixed, when the shear direction angle increases in the range of 0 掳to 90 掳, the softening index increases in turn. When 90 掳胃 鈮，

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