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Experimental and numerical studies of a strip footing on geosynthetic-reinforced sand
International Journal of Physical Modelling in Geotechnics ( IF 1.9 ) Pub Date : 2020-09-01 , DOI: 10.1680/jphmg.18.00021
Youwei Xu 1 , Guanxi Yan 2 , David J. Williams 3 , Mehdi Serati 4 , Alexander Scheuermann 5 , Timothy Vangsness 2
Affiliation  

The behaviour of footings on geosynthetic-reinforced soils has been investigated by many researchers through experimental and numerical modelling under stress-controlled or strain-controlled conditions. It is believed that stress-controlled tests better represent the field conditions because the load applied to the footing increases as the super structure is being built. Therefore, a new experimental set-up was designed under a stress-controlled condition, with the application of particle image velocimetry (PIV) technique. A series of model footing tests were carried out using this equipment to investigate the behaviour of the geosynthetic-reinforced soil below a strip footing. The deformation inside the soil mass below the strip footing was determined using the PIV technique. The reinforcing performances of the single-layer and multi-layer geotextile and geogrid embedded at different depths were compared and discussed by analysing the load-settlement curves. The optimum embedment depth for the single-layer geosynthetic reinforcement is in the vicinity of 0.4B. It is found that there is a stepwise increase phenomenon in settlement under the stress-controlled condition. The ultimate bearing capacities were determined from the obtained stepwise load-settlement curves using three approaches, including the tangent intersection method, the tail linear method and the allowable settlement method. The three approaches were coded in a Python program in order to easily determine and compare the results. In addition, the experimental model footing tests were simulated using the finite element method (FEM) under the same stress-condition condition with good agreement for a settlement range within 0.1B.

中文翻译:

土工合成材料加筋砂条形基础的试验与数值研究

许多研究人员通过在应力控制或应变控制条件下的实验和数值模拟研究了土工合成材料加筋土上的基础行为。相信应力控制试验能更好地代表现场条件,因为施加到基础上的载荷随着上部结构的建造而增加。因此,应用粒子图像测速 (PIV) 技术,在应力控制条件下设计了一种新的实验装置。使用该设备进行了一系列模型基础测试,以研究条形基础下方的土工合成材料加筋土的行为。使用 PIV 技术确定条形基础下方土体内部的变形。通过对荷载沉降曲线的分析,对不同埋入深度的单层和多层土工布及土工格栅的补强性能进行了比较和讨论。单层土工合成材料加筋的最佳埋置深度在0.4B附近。发现在应力控制条件下沉降存在阶梯式增加现象。使用三种方法,包括切线法、尾部线性法和许用沉降法,从获得的逐步荷载-沉降曲线确定极限承载力。这三种方法都在 Python 程序中编码,以便轻松确定和比较结果。此外,
更新日期:2020-09-01
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