DEM modeling of installation damage of geogrids under rockfill compaction condition

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-07-18 DOI:10.1016/j.geotexmem.2024.07.006

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Abstract

To investigate the installation damage of geogrids during roller compaction under rockfill condition, a three-dimensional discrete element model for roller compaction of geogrid-reinforced rockfill was established. The rockfill was modeled by irregular rigid block elements, while the geogrids were modeled by bonding basic ball elements. The model parameters were then calibrated by triaxial consolidated-drained and tensile tests. The displacements of the geogrids in three perpendicular directions, and the strength of the geogrids was analyzed. Additionally, the effects of compaction parameters on the installation damage of the geogrids were studied. The results showed that deformation of the geogrids was relatively small in the roller-driving direction but significant in the roller-axis and settlement directions. The damage modes of the geogrids could be mainly classified into three types: rib fracture, rib end fracture, and node fracture. The installation damage of the geogrid was derived mainly from its uneven deformation and fracture, and after roller compaction the strength distributions at different locations of the geogrid layer showed a normal distribution. Furthermore, the installation damage of the geogrids increased with increasing excitation force and compaction passes but decreased with increasing overlying rockfill thickness, roller velocity, and excitation frequency.

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岩石填充压实条件下土工格栅安装损坏的 DEM 建模

为了研究土工格栅在填石条件下的压路机压实过程中的安装损坏情况，建立了土工格栅加固填石压路机压实的三维离散元模型。填石由不规则刚性块体元素建模，而土工格栅则由粘结基本球元素建模。然后通过三轴固结排水试验和拉伸试验对模型参数进行了校准。分析了土工格栅在三个垂直方向上的位移以及土工格栅的强度。此外，还研究了压实参数对土工格栅安装损坏的影响。结果表明，土工格栅在压路机驱动方向的变形相对较小，但在压路机轴向和沉降方向的变形较大。土工格栅的损坏模式主要分为三种：肋骨断裂、肋端断裂和节点断裂。土工格栅的安装破坏主要源于其不均匀变形和断裂，压路机压实后，土工格栅层不同位置的强度分布呈正态分布。此外，土工格栅的安装破坏随着激振力和压实遍数的增加而增加，但随着上覆填石厚度、压路机速度和激振频率的增加而减少。

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来源期刊

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.