Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size
Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size
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DOI：
10.1016/j.geotexmem.2016.06.006
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发表时间：
2016-12-01
影响因子：
5.2
通讯作者：
Mehdizadeh, H.
中科院分区：
文献类型：
--
作者：
Mehrjardi, Gh. Tavakoli;Ghanbari, A.;Mehdizadeh, H.
本文研究了坡顶有限宽度堆载（宽度为140 mm的条形基础）下土工格栅加筋对边坡变形及其稳定性的影响。进行了一系列缩小比例的板载荷试验，以涵盖不同的参数，包括两种砂粒尺寸（即细砂和粗砂）、三种不同长度的土工格栅加固以及距坡顶的条形基础的三个位置（即“边缘距离”）。对基础承载力、破坏机制和边坡影响因素进行了讨论和评价。研究发现，砂粒尺寸对加筋边坡的性能有很大影响，导致其模态行为的改变，尤其是在破坏状态下。根据试验结果，为达到“平面”状态条件，无论边距如何，细砂土工格栅和粗砂土工格栅的合适长度分别为基脚宽度的6倍（L=6B）和基脚宽度的4倍（L=4B）。此外，据观察，对于细沙，基础的安全边缘距离可考虑为 D = 3B。然而，对于粗砂，该值可能会增加到3B以上。特别是，建立了提供最大增强效果的研究参数的临界值。 (C) 2016 Elsevier Ltd. 保留所有权利。
This paper investigates the influence of geogird reinforcement on slope deformations and its stability under a limited width of surcharge (strip footing with width of 140 mm) on the crest. A series of reduced scale plate load tests were conducted to cover different parameters including two sand-particle sizes (namely fine and coarse sands), three different lengths of geogrid reinforcement and three positions of strip footing from crest of the slope namely "edge distance". Bearing capacity of the footing, failure mechanisms and factor of slope influence are discussed and evaluated. It is found out that the particle size of sands has great influence on the behaviour of reinforced slope and leads to change its modal behaviour especially at failure state. Based on experimental results, to achieve "plane" status conditions, regardless of the edge distance, the proper length of geogrids for fine and coarse sands were obtained 6 times of footing width (L = 6B) and 4 times of footing width (L = 4B), respectively. Also, it was observed that for fine sand, the safe edge distance of footing can be considered D = 3B. However, for coarse sand, this value might be increased to more than 3B. Particularly, critical values of studied parameters for providing maximum reinforcing effects are established. (C) 2016 Elsevier Ltd. All rights reserved.