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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil Engineering, Architectural Engineering     
Unified simplified settlement formula based on YinGraham’s rheological model
HU Ya yuan, YANG Qiu hua
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
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Abstract  

From the perspective of the idea that under certain condition hypothesis B is approximately equivalent to modified hypothesis A in quasiplastic viscoelastic model, a new simplified formula of void ratio in terms of equivalent time was proposed based on YinGraham’s equivalent time rheological model and using time reduction factor to modify the difference between real time and equivalent time. The formula was valid for any suddenly loading and unloading cases, including loading in normally consolidated soil, loading in overconsolidated soil, unloading and loading after unloading. Two simplified formula of void ratio for the multistage construction were established by the means of total consolidation degree method and grading consolidation degree method, respectively. Through comparing with the exact solution and the measured data on site, results show that the calculation error of postconstruction settlement by the new simplified formula of void ratio is obviously smaller than those by the classical method and the old equivalenttime method in singlestage construction. The theoretical duration of surcharge preloading and postconstruction settlement were analyzed by the total consolidation degree method and the grading consolidation degree method respectively. Both results are approximate to the exact solution. As the total consolidation degree method is much simpler than the grading consolidation degree method, the former is suggested to calculate preloading duration and postconstruction settlement in the preloading method.

Published: 01 June 2016
CLC:  TU 47  
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HU Ya yuan, YANG Qiu hua. Unified simplified settlement formula based on YinGraham’s rheological model. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(6): 1009-1017.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.06.001     OR     http://www.zjujournals.com/eng/Y2016/V50/I6/1009


YinGraham流变模型沉降简化计算统一公式

从准塑性黏弹性模型在一定条件下假说B与修正的假说A近似等价的视角出发,基于YinGraham等效时间流变模型,通过时间折减因子修正实际时间和等效时间之间的差异,提出用等效时间表示的新孔隙比简化计算公式.该公式适用于任意突然加卸载工况,包括加载到正常固结土、加载到超固结土、卸载和卸载再加载.通过总固结度法和分级固结度法获得2种多级加载孔隙比简化计算公式.与精确解和现场实测数据对比结果表明,单级加载时新孔隙比简化公式预测的工后沉降计算偏差明显低于采用经典法和旧等效时间法得到的计算偏差；多级加载时总固结度法和分级固结度法计算的理论超载预压持续时间和工后沉降量均与精确解结果接近；由于总固结度法远比分级固结度法简单,建议采用前者计算预压法工艺的持续时间和工后沉降量.

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