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本文介绍了用人工制备的饱和粘土试样,在正常固结状态和超固结状态下,用不同应力路径所进行的压缩和伸长试验的成果。试验资料表明,用作图法确定塑性应变增量的方向,根据正交法则,求得塑性势函数。同时,论证了正常固结和轻超固结粘土,塑性势函数等于屈服函数;以塑性体应变为硬化参数的屈服函数,不论对压缩试验,还是伸长试验均具有唯一性。对重超固结粘土,采用等塑性剪应变为硬化参数的屈服函数,比用破坏条件的屈服函数更能较好地描述土的剪胀特性。
This paper presents the results of compression and elongation tests performed with different stress paths for artificially prepared saturated clay specimens under normal consolidation and overconsolidation. The experimental data show that, as a method of determining the direction of plastic strain increment, the plastic potential function is obtained according to the orthogonal rule. At the same time, the normal consolidation and lightly over-consolidated clays are demonstrated. The plastic potential function is equal to the yield function. The yield function with the plastic body strain as the hardening parameter is unique both for the compression test and the elongation test. For heavy overconsolidated clays, the yield function with isoplastic shear strain as hardening parameter can describe the dilatancy characteristics of soil better than the yield function with failure conditions.