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饱和软粘土不排水强度在实际工程中应用很多,不同试验方法测得的不排水强度不同。本文基于无侧限抗压强度试验和微型十字板剪切试验,对天津滨海吹填软土从取样深度变化、初始各向异性、不同加荷速率三方面进行了对比试验。试验结果表明:两种不同试验强度随取样深度的增加而增大且呈不同程度线性关联性,吹填软土受荷后应变模式、剪破面的方向、破坏标准的不同是导致试验强度差异的主要原因;初始各向异性对两种不同试验条件下的强度值有不同的规律影响,无侧限抗压强度试验强度在竖直制样方向最大,水平方向次之,斜方向最小,微型十字板剪切试验强度在水平制样方向最大,斜方向次之,竖直方向最小;加荷速率对两种不同试验条件下的强度值有相同的规律影响,两种试验强度都随着加荷速率的增大而增加。利用统计回归原理,拟合得到了原状吹填软土在两种室内试验条件下强度之间的关联表达式,便于实际工程参考。
The undrained strength of saturated soft clay is widely used in practical engineering, and the undrained strength measured by different test methods is different. Based on the unconfined compressive strength test and the micro-vane shear test, the contrastive tests were carried out on the three aspects of depth of fill, initial anisotropy and different loading rates. The experimental results show that the intensities of two different tests increase with the increase of sampling depth and are linearly correlated to different extents. The strain modes and the direction of shear fracture surface of the soft soil after filling are different, which leads to the difference of test intensity . The initial anisotropy has different regularity on the strength values under two different experimental conditions. The strength of unconfined compressive strength test is the largest in the vertical sample preparation direction, the second in the horizontal direction, the smallest in the oblique direction, The strength of V-plate shear test is the largest in the horizontal sample preparation direction, the second in the oblique direction and the smallest in the vertical direction. The loading rate has the same regularity on the strength values under the two different test conditions. The increase of the loading rate increases. By using the principle of statistical regression, the correlation between the strength of plain soft soil under the two indoor test conditions is obtained, which is convenient for practical engineering reference.