Gravity model testing overconsolidated soft clay under repeated moving loads
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摘要: 研发了能够进行往复移动荷载下超固结软土地基的室内重力模型试验装置,并基于该试验平台开展了上海浅层超固结饱和软黏土的重力模型试验研究。通过一系列试验,揭示了超固结饱和软黏土地基在往复移动荷载下的累计孔压及累计变形随往复次数及动载幅值的时空演化规律。试验表明,深层土体处的超孔压动力响应明显较浅层的动力响应低,但其动力响应更为迅速。同时,土体在交通荷载行进方向上的动力响应比其他方向上更为强烈,其孔压衰减也最不明显。此外,动载幅值越大,初期的塑性变形和后期的位移增量也明显变大,并且不同水平位置处的差异沉降也越大。Abstract: A gravity model test device is developed to simulate overconsolidated soft clay under repeated moving loads. Using this device, the model tests on Shanghai shallow overconsolidated saturated soft clay are carried out. Through a series of tests, it is revealed that temporal and spatial variation of the accumulated pore pressure and deformation about overconsolidated saturated soft clay foundation with the number and amplitude of changing repeated moving loads. The test results show that the dynamic response of the excess pore pressure in the deep soil is obviously lower than that of shallow soil, but its peak value comes earlier. At the same time, the dynamic response of soil in the direction of moving loads is stronger than that in other directions, and the dissipation of the excess pore pressure in that direction is also the least obvious. In addition, with the amplitude of increasing dynamic loads, the plastic deformation at the initial stage and the displacement increment at the later stage get larger, and the difference of settlements at different horizontal positions becomes larger too.
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Keywords:
- moving load /
- test device /
- model test /
- accumulated pore pressure /
- accumulated deformation
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[1] 钱建固, 王永刚, 张甲峰, 等. 交通动载下饱和软黏土累计变形的不排水往复扭剪试验[J]. 岩土工程学报, 2013, 35(10): 1790-1798.
(QIAN Jian-gu, WANG Yong-gang, ZHANG Jia-feng, et al.Undrained cyclic torsion shear tests on permanent deformation responses of soft saturated clay to traffic loadings[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1790-1798. (in Chinese))[2] 魏道垛, 胡中雄. 上海浅层地基土的前期固结压力及有关压缩性参数的试验研究[J]. 岩土工程学报, 1980, 2(4): 13-22.
(WEI Dao-duo, HU Zhong-xiong.Experimental study of preconsolidation pressure and compressibility parameters of Shanghai subsoil[J]. Chinese Journal of Geotechnical Engineering, 1980, 2(4): 13-22. (in Chinese))[3] 黄茂松, 李进军, 李兴照. 饱和软粘土的不排水循环累积变形特性[J]. 岩土工程学报, 2006, 28(7): 891-895.
(HUANG Mao-song, LI Jin-jun, LI Xing-zhao.Cumulative deformation behaviour of soft clay in cyclic undrained tests[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(7): 891-895. (in Chinese))[4] 蒋红光, 边学成, 徐翔, 等. 列车移动荷载下高速铁路板式轨道路基动力性态的全比尺物理模型试验[J]. 岩土工程学报, 2014, 36(2): 354-362.
(JIANG Hong-guang, BIAN Xue-cheng, XU Xiang, et al.Full-scale model tests on dynamic performances of ballastless high-speed railways under moving train loads[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(2): 354-362. (in Chinese))[5] AWOLEYE E O A. Ballast type-ballast life prediction[M]. Derby: British Rail Research LR CES 122, 1993. -
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