Investigation of load transfer mechanisms in reinforced cohesive soil embankments in case of subsidence using DEM

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Maria Delli Carpini, Pascal Villard, Fabrice Emeriault
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Abstract

Cavity formations by soil dissolution or underground collapses are at the origin of large surface subsidence that constitutes a risk of damage or failure for infrastructures. Soil reinforcement with geosynthetics positioned at shallow depth is an economical and functional solution to reduce the induced surface settlements. Previous research has mainly focused on the load transfer mechanism and the arching effect in cohesionless reinforced backfills when the cavity opens. Experimental and numerical studies dealing with cohesive soils are very rare, although this situation is commonly found in practice. To overcome this lack of knowledge, a numerical study based on Discrete Element Modelling is carried out to better understand the load transfer mechanisms that are mobilized in cohesive embankments prone to underground cavity opening. The results are compared with experimental data obtained on a small-scale laboratory model in terms of vertical and horizontal displacements of both soil and geosynthetics. The numerical results focus on the collapse mechanisms of the cohesive embankment, the load transfer mechanisms, the shape of the vertical load distribution acting on the geosynthetic layer, the strain and traction forces within the geosynthetic sheet.

利用 DEM 研究沉降情况下加固粘性土路堤的荷载传递机制
土壤溶解或地下塌陷造成的空洞是地表大面积沉降的根源,而地表大面积沉降会对基础设施造成损害或破坏。在浅层使用土工合成材料加固土壤是减少地表沉降的经济而实用的解决方案。以往的研究主要集中在空洞打开时无粘性加固回填土的荷载传递机制和拱起效应。针对粘性土的实验和数值研究非常罕见,尽管这种情况在实践中很常见。为了克服这种知识的匮乏,我们开展了一项基于离散元件建模的数值研究,以更好地了解容易出现地下空洞的粘性路堤中的荷载传递机制。在土壤和土工合成材料的垂直和水平位移方面,研究结果与在小型实验室模型上获得的实验数据进行了比较。数值结果的重点是粘性路堤的坍塌机制、荷载传递机制、作用在土工合成材料层上的垂直荷载分布形状、土工合成材料层内的应变和牵引力。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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