Laboratory model tests were carried out to study the behavior of strip footing resting on a geogrids-reinforced dune sand. The tests were performed on a rigid steel tank having glass side with inner dimensions of 1 m by 0.64 m by 0.23 m. Footings were placed at different depths from the surface of sand. Geogrids were placed at different depths below the footing starting at 0.25B to 1.25B. The sand was placed in the tank using raining method. The use of geogrids improved the bearing capacity of strip footings by a factor of up to 4 times. The improvement depends on depth of the footing, the depth of the geogrids below the footing and the number of the geogrids layers. For two layers of geogrids the highest improvement is when the depth of first reinforcement below the footing is between 0.25 to 0.5B, the spacing (h) is between 0.25 to 0.5B and the overall depth of the reinforcements (d_r) is about 0.5 to 0.75B. The geogrids modified the load-settlement curve for the footing by increasing the strains at failure to up to three times that of unreinforced sand. This means with geogrids the footing will undergo more elastic settlements before failure.
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机译:进行了实验室模型测试,以研究基于土工格栅加固的沙丘上的带状地基的行为。在具有玻璃侧面且内部尺寸为1 m x 0.64 m x 0.23 m的刚性钢罐上进行测试。放置的脚距沙子表面的深度不同。将土工格栅放置在桩基下方不同深度处,起始深度为0.25B至1.25B。使用雨淋法将沙子放置在水箱中。土工格栅的使用将带状地基的承载能力提高了多达4倍。改进取决于基础的深度,基础下方的土工格栅的深度以及土工格栅的层数。对于两层土工格栅,最大的改进是,当基础以下的第一个钢筋的深度在0.25到0.5B之间,间距(h)在0.25到0.5B之间且钢筋的总深度(d_r)大约在0.5到0.5B之间时。 0.75磅土工格栅通过将破坏时的应变增加到未加固砂土的应变的三倍来修改基础的荷载沉降曲线。这意味着对于土工格栅而言,立足点将在失效之前经历更多的弹性沉降。
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