Embankments reinforced by piles and geosynthetics—Numerical and experimental studies dealing with the transfer of load on the soil embankment
Embankments reinforced by piles and geosynthetics—Numerical and experimental studies dealing with the transfer of load on the soil embankment
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DOI：
10.1016/j.enggeo.2009.03.001
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发表时间：
2009-05
影响因子：
7.4
通讯作者：
P. Villard
中科院分区：
文献类型：
--
作者：
P. Villard
由于新技术和新材料的使用，岩土工程结构的尺寸越来越复杂。尤其是桩和土工合成材料加固的地基。两个主要机制是支配这种结构的行为：一个嵌入效应（或转移负载）到土堤和膜效应的土工合成材料片。因此，路堤的竖向荷载可以通过土工织物的膜效应直接传递到桩上，也可以通过土工织物的膜效应间接传递到桩上。通过这种方式，路堤的大部分荷载由桩支撑。为了更好地理解土工合成材料板加固桩上填料的性能，对荷载传递到土堤中的问题进行了数值研究。它是基于使用的有限元和离散元方法之间的耦合，特别是开发这种结构建模。数值分析的一部分包括参数研究，测试桩帽的尺寸，土工合成材料的刚度，路堤的高度和下伏土壤的刚度的影响。另一部分是数值模型与真实尺寸实验结果的比较。特别注意显示的荷载传递机制和膜效应。
The dimensioning of geotechnical earth structures is, due to the use of new technologies and new materials, more and more sophisticated. It is particularly the case for the embankments reinforced by piles and geosynthetics. Two main mechanisms are governing the behaviour of this kind of structures: an arching effect (or transfer of load) into the soil embankment and the membrane effect of the geosynthetics sheet. Thus, the vertical load of the embankment can be directly transferred to the piles by an arching effect or indirectly via the membrane effect of the geotextile. A great part of the load of the embankment is by this way supported by the piles. To improve the understanding of the behaviour of embankments on piles reinforced by geosynthetic sheet, a numerical study dealing with the transfer of load into the soil embankment was initiated. It is based on the used of a coupling between finite and discrete element methods especially developed to model this kind of structures. One part of the numerical analyse consists to a parametrical study testing the influence of the size of the piles cap, the geosynthetics stiffness, the height of the embankment and the rigidity of the underlying soil. The other part deals with the comparison between the numerical model with experimental results of a true scale experiment. A particular attention is paid to show the load transfer mechanisms and the membrane effect.