超静定土工格栅的强度特性测试研究

摘要

超静定土工格栅的测试在现行规范中难以找到明确的测试方法。为了对超静定土工格栅的强度力学性能进行测试研究，对超静定土工格栅采取了7种不同种方案的拉伸试验测试。试验结果表明：①超静定土工格栅的单向土工格栅多条受力时呈现出以上一级（少于此多条格栅一条的多条格栅）的单根格栅折算强度的大约90%增加；②建议现行相关规范中土工格栅单条法计算拉伸强度时试样最大拉力应乘以一折算系数，对于本实验中的超静定土工格栅，所乘折算系数取为10（1-0.9N），N为样品每米宽度上的肋数；③本研究中的超静定土工格栅的超静定作用使得单根格栅折算强度提高1.03%~14.06%，效果明显，建议更多超静定土工格栅的生产与应用。%It is difficult to find a definite method for hyperstatic geogrid testing in current specifications. In order to conduct test study on the mechanical properties of hyperstatic geogrid strength, this paper adopts seven different tensile test schemes for hyperstatic geogrid. The test results show that:①Uniaxial hyperstatic geogrids' multiple tensile stress increases about 90% of the upper level's single grid conversion strength; ② In calculating tensile strength with geogrid single method in current relevant specifications, the grid's sample maximum tensile strength should be multiplied by a coefficient, and in this hyperstatic geogrid test study the multiplication coefficient is about 10×(1-0.9N) with N being the number of samples per meter in width;③Hyperstatic geogrids' hyperstatic ef-fects make the single grid conversion strength increase about 1.03%~14.06%, and the obvious effect suggests more hyperstatic geogrid can be produced and applied.