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本文叙述我所从1963年以来,用三轴仪测定饱和软粘土有效强度包线的工作中存在的有关实验技术的九个问题,以及我们对这些问题的初步看法。这九个问题是:(1)试样扰动;(2)滤条的作用;(3)剪切前的孔隙压力;(4)反压力;(5)剪切过程中试样断面和高度的变化;(6)剪切速率;(7)活塞摩阻;(8)橡皮膜影响;(9)破坏点的确定。此外,在附录中介绍我所采用的饱和粘性土三轴固结不排水剪切试验操作程序。
This article describes nine issues relating to experimental techniques that have existed in the work of measuring the effective envelope of saturated soft clay with triaxial machines since 1963, and our preliminary observations on these issues. The nine problems are: (1) sample disturbance; (2) the effect of the filter bar; (3) the pore pressure before shearing; (4) back pressure; (5) the profile and height of the sample during the shearing process Change; (6) Shear rate; (7) Piston friction; (8) Effect of rubber diaphragm; (9) Definite damage point. In addition, in the appendix I introduce the triaxial consolidated undrained shear test procedure for saturated clays.