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本文的研究课题是探讨饱和砂土的液化应力条件。首先,指出在液化势判别中现场土单元的受力条件与液化试验土样的受力条件的不同是一个重要的影响因素。如果以最大往返剪切作用面上的应力分量表示液化应力条件,这个影响会得到合理的考虑。对于三轴液化试验、简切液化试验的受力条件和平面应变状态下土单元的受力条件,证明了最大往返剪切作用面的位置只由静力有效应力分量来确定而与往返应力无关。这个特点使得最大往返剪切作用面上的静力有效应力分量和往返应力分量的表达式十分简单,便于应用。为了建立液化应力条件引进了一个往返剪切作用函数,这个函数是以最大往返剪切作用面上的应力分量表示的。由此确定出来的液化应力条件能够对现行的几种液化试验的结果作出统一的解释。这样,所给出的液化应力条件的适用性得到了必要的试验证明。
The research topic of this paper is to explore the liquefaction stress conditions of saturated sand. Firstly, it is pointed out that the difference between the stress conditions of the soil units in the field and the stress conditions of the soil samples in the liquefaction test is an important factor in determining the liquefaction potential. If the liquefaction stress condition is represented by the stress component on the maximum reciprocating shear effect surface, this effect will be reasonably considered. For the triaxial liquefaction test, the stress conditions of the simple liquefaction test and the stress conditions of the soil element under the plane strain state, it is proved that the position of the maximum reciprocating shear surface is determined only by the static effective stress component and is independent of the round-trip stress. . This feature makes the expression of the static effective stress component and the back-and-forth stress component of the maximum reciprocating shear action surface very simple and easy to apply. A reciprocal shear function was introduced in order to establish liquefied stress conditions. This function is represented by the stress component on the maximum reciprocating shear action surface. The liquefaction stress conditions determined from this can provide a unified interpretation of the results of several current liquefaction tests. In this way, the applicability of the given liquefaction stress conditions is confirmed by the necessary tests.