地铁循环荷载作用下冻融土滞回曲线及阻尼比特性研究

doi:10.13722/j.cnki.jrme.2019.0133

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摘要人工冻结法在地铁施工中被广泛应用，冻融作用后土体的滞回曲线及阻尼比特性会发生改变，基于此对冻融土试样进行动三轴试验，深入分析地铁循环荷载作用下土体滞回曲线及阻尼比的演变规律。结果表明：加载过程中冻融土滞回曲线由宽厚变得狭长，降低冻结温度及减小土体固结度会使滞回曲线面积和不闭合程度增大，循环荷载不能完全抵消冻结温度和固结度的作用；随着循环次数的增加，冻融土阻尼比先迅速减小，随后保持稳定并略有升高，之后缓慢减小并最终趋于稳定；随着冻结温度降低，循环加载初期和末期冻融土的阻尼比均明显增大；降低固结度使初始阻尼比显著减小，对加载末期阻尼比的影响规律则相对不明显。阻尼比与循环加载次数的关系本质上是与累积应变的关系，根据试验数据首次提出了冻融土阻尼比与累积轴向应变之间的函数关系。研究可为地铁冻结法施工区域的工后沉降控制提供有益的指导。

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	魏新江1
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	庄家煌1
	丁智2
	蔡知进1

关键词 ：土力学, 冻融土, 循环荷载, 滞回曲线, 阻尼比, 固结度

Abstract：Artificial freezing method is widely used in the construction of subway，and freezing-thawing action will results in changes of hysteretic curves and damping ratio of soil. Dynamic triaxial test was operated on frozen-thawed soil samples to obtain the developing patterns of hysteretic curves and damping ratio of soil samples under cyclic subway loading. The test results show that, under cyclic loading，hysteretic loops change from wide to thin and long，that the area and opening of hysteretic loops increase with decreasing the freezing temperature or the consolidation degree，and that the effect of the cyclic load cannot offset the effect of the freezing temperature and the consolidation degree. With increasing the number of loading cycle，the damping ratio in turn declines rapidly，keeps constant，increases slightly，decreases slowly and tends to be stable. Both the initial and final stable damping ratios increase markedly with decreasing the freezing temperature. Decreasing the consolidation degree makes the initial damping ratio decrease conspicuously while has no obvious influence on the final stable damping ratio. The relationship between the damping ratio and cyclic loading times boils down to the relationship between the damping ratio and the accumulated strain. Based on the experimental data, a function describing the relationship of the damping ratio and the accumulated axial strain was derived. The study can give a beneficial guidance on controlling the post-construction settlement of the area where artificial frozen method is applied.

Key words： soil mechanics')" href="#">

soil mechanics frozen-thawed soil cyclic loading hysteretic curve damping ratio ')" href="#">consolidation degree

引用本文:

魏新江1，2，庄家煌1，丁智2，蔡知进1. 地铁循环荷载作用下冻融土滞回曲线及阻尼比特性研究[J]. 岩石力学与工程学报, 2019, 38(10): 2092-2102.
WEI Xinjiang1，2，ZHUANG Jiahuang1，DING Zhi2，CAI Zhijin1. Research on the characteristics of hysteretic curves and damping ratio of frozen-thawed soils under cyclic subway loading. , 2019, 38(10): 2092-2102.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0133 或 http://www.rockmech.org/CN/Y2019/V38/I10/2092

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