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为了研究柔性加筋土复合体的基本力学特性,分别对无纺土工布加筋砂、土工格栅加筋砂、“土工布+纤维”综合加筋砂和“土工格栅+纤维”综合加筋砂制作的多组试样完成了一系列组合工况下的无侧限抗压试验.得到以下主要结论:1)土工布的强度和加筋层间距应与砂的密度相匹配,此时,两者协同工作性最好,加筋砂土极限强度高,破坏应变大;2)相同情况下,“土工布+纤维”综合加筋砂的强度比土工布加筋砂的高,但当砂的密度和加筋层间距都较小时,强度提高不显著;3)应变较大时,土工格栅加筋砂的强度明显低于土工布加筋砂的强度,这可能是格栅与砂土的刚度差异过大以致格栅-土界面产生了相对滑动所致;4)纤维的掺入既提高了“土工格栅+纤维”综合加筋砂的强度,又提高了其承受大变形的能力.
In order to study the basic mechanical properties of the flexible reinforced earth composites, the influence of the geosynthetics of the non-woven geotextile, the geogrid reinforced sand, the geotextile + fiber reinforced sand and the geogrid + fiber “The multi-group samples made by the integrated stiffened sand have completed a series of unconfined compressive tests under combined conditions, and the following main conclusions are obtained: 1) The strength of the geotextile and the spacing of the stiffened layers should be proportional to the density of the sand Matching, at this time, the two work together best, reinforced sand ultimate strength, failure strain; 2) under the same circumstances, ”geotextiles + fiber “ integrated reinforced sand than geotextile reinforcement However, when the density of sand and the distance between stiffened layers are small, the strength increase is insignificant. 3) When the strain is large, the strength of geogrid-reinforced sand is obviously lower than the strength of geotextile-stiffened sand. The reason is that the difference between the stiffness of the grille and the sand is too large to cause the relative sliding of the grille-soil interface. 4) The incorporation of the fiber not only increases the strength of the ”geogrid + fiber" But also increase its ability to withstand large deformation.