An Improved Model to Describe the Creep Behavior of Soft Soil
An Improved Model to Describe the Creep Behavior of Soft Soil
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DOI：
10.1007/s11204-022-09839-y
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发表时间：
2022-11
影响因子：
0.8
通讯作者：
J. Yuan;W. Lin;Z. Liu;Q. Fu;L. Ye;J. Zhao
中科院分区：
文献类型：
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作者：
J. Yuan;W. Lin;Z. Liu;Q. Fu;L. Ye;J. Zhao
采用室内直剪蠕变仪对广州萝岗区软土的蠕变特性进行了试验研究。对试样施加正应力，在恒定水平剪应力下监测相应的位移。结果表明，在较低剪应力水平下，萝岗软土表现出衰减稳定蠕变特性。在较高的剪切应力水平下，蠕变曲线进入恒定蠕变阶段。恒定蠕变速率随着剪切应力的增加而增加。将软土的非线性蠕变应力-应变等值线与理论模型和经验模型相结合，建立了软土的非线性蠕变本构模型。该模型可为突发性自然灾害下的滑坡防治提供参考。
The creep characteristics of soft soil from the Luogang District of Guangzhou (China) were analyzed using a laboratory-based direct shear creep apparatus. Normal stress was applied to the samples, and the corresponding displacement was monitored under constant horizontal shear stress. The results show that at lower shear stress levels, Luogang soft soil shows the characteristics of attenuated stable creep. At higher shear stress levels, the creep curve enters a phase of constant creep. The constant creep rate increases with increasing shear stress. We developed a nonlinear creep constitutive model by combining the nonlinear creep stress-strain isochronous curve of the soft soil with theoretical and empirical models. This model will be useful for devising strategies to prevent landslides during sudden natural disasters.