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首页> 外文期刊>Geotextiles and Geomembranes >Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study
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Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study

机译：桩承式加筋路堤中土工格栅的拉伸力：全方位试验研究

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In this study, a full-scale high-speed railway embankment model was established for assessment of the tensile force of the geogrid embedded in the sand cushion. Water bags were distributed around pile caps to create a model of the subsoil. The settlement of the subsoil was determined by the vertical deformation of the water bags. The tensile force of the geogrid, induced by the spreading force of the embankment, and caused by the vertical loads applied to the geogrid, were separately measured by two types of optical fiber sensing approaches, i.e., the pulse-prepump-Brillouin optical time domain analysis (PPP-BOTDA) and fiber Bragg grating (FBG) sensors. After the completion of the construction of the embankment, the measured tensile force of the geogrid, caused by the spreading force, is about 12% of that calculated by using the BS8006 standard. During the process of subsoil consolidation, the soil arching in the embankment fully develops as the subsoil settlement increases. At the ultimate limit state, the largest tensile force of the geogrid caused by the vertical loads occurs at the edge of the pile cap, which is about 34% of that calculated by using BS8006. As a design method, BS8006 calculates the tensile force of the geogrid at the ultimate limit state, and the experimental results reveal that the computational procedure specified in BS8006 is safe for determination of the tensile force of the geogrid. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在这项研究中，建立了一个完整的高速铁路路堤模型，以评估嵌在砂垫中的土工格栅的拉力。将水袋分布在桩帽周围，以创建地下土壤模型。底土的沉降取决于水袋的垂直变形。路堤的扩展力引起的土工格栅的拉伸力，以及施加在土工格栅上的垂直载荷所引起的拉力，是通过两种光纤传感方法分别测量的，即脉冲预泵-布里渊光学时域分析（PPP-BOTDA）和光纤布拉格光栅（FBG）传感器。路堤施工完成后，由摊铺力引起的土工格栅测得拉力约为使用BS8006标准计算得出的拉力的12％。在下层土固结过程中，随着下层土沉降的增加，路堤中的土拱效应充分发展。在极限状态下，由竖向荷载引起的土工格栅最大拉力出现在桩帽边缘，约为使用BS8006计算得出的拉力的34％。作为一种设计方法，BS8006计算了土工格栅在极限极限状态下的拉力，实验结果表明，BS8006中指定的计算程序对于确定土工格栅的拉力是安全的。 （C）2015 Elsevier Ltd.保留所有权利。

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