主应力轴循环旋转条件下重塑黏土变形特性试验研究

发布时间：2018-05-01 04:48

本文选题：重塑软黏土 + 主应力轴循环旋转　；参考：《土木工程学报》2014年08期

【摘要】：通过一组重塑黏土的循环扭剪试验对主应力轴单纯循环旋转条件下重塑黏土的不排水变形特性进行研究,试验中考虑中主应力系数、剪应力水平以及固结方式等的影响。试验结果表明即使在剪应力水平很低(q/p=0.033)的条件下,主应力轴单纯旋转也会引起重塑黏土显著的孔压累积。随着循环次数的增加不排水条件下重塑黏土会因为变形的迅速发展而破坏。中主应力系数对变形发展规律有较大影响,对孔压累积的影响相对不显著,相同剪应力水平下b=1时重塑黏土破坏时所需的循环次数最少,但孔压累计最慢。通过试验结果的分析认为旋转剪应力会对土体微观结构产生扰动而使土体颗粒重新排列,主应力轴旋转引起的变形特性主要还是归因于土体的塑性各向异性特性。
[Abstract]:The characteristics of undrained deformation of remolded clay under the condition of simple cyclic rotation of principal stress axis were studied by a group of cyclic torsional shear tests. The effects of the coefficient of principal stress, the level of shear stress and the consolidation mode were considered in the experiment. The experimental results show that even when the shear stress level is very low Q / p0. 033), the simple rotation of the principal stress axis can cause significant pore pressure accumulation in the remolded clay. With the increase of cycle times, the remolded clay will be destroyed by the rapid development of deformation under undrained conditions. The coefficient of middle principal stress has a great influence on deformation development law, but the effect on pore pressure accumulation is relatively insignificant. At the same shear stress level, the number of cycles required for remolding clay under the same shear stress level is the least, but the accumulation of pore pressure is the slowest. Through the analysis of the test results, it is concluded that the rotating shear stress will disturb the microstructure of the soil and cause the soil particles to rearrange. The deformation characteristics caused by the rotation of the principal stress axis are mainly attributed to the plastic anisotropy of the soil.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学建筑工程学院;
【基金】：国家自然科学基金(51338009,51178422,51078329)
【分类号】：TU41;TU442

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