土工合成材料与土工合成材料加筋砂土的相关特性

目前土工合成材料加筋的理论研究明显落后于工程实践。为了指导土工合成材料的优选和研究加筋机理，以5种国产土工合成材料为加筋材料，它们分别是针刺无纺土工织物、涤纶纤维经编土工格栅、玻璃纤维经编土工格栅、双向塑料拉伸土工格栅和土工网，系统进行三轴压缩试验以比较各种土工合成材料对砂土的加筋效果。试验结果表明：（1）各种土工合成材料加筋砂土的抗剪强度和应力应变特性不同；（2）无纺土工织物适合用于允许大变形的加筋土工程，涤纶纤维经编土工格栅和塑料拉伸土工格栅均适合用于对变形有较严格要求的加筋土工程，玻璃纤维经编土工格栅适合用于对变形有严格限制的加筋工程，设计时需要较大的安全系数，土工网适用低等级的加筋土工程；（3）砂土对各种土工合成材料侧向收缩的约束作用差异显著。

Behavior of geosynthetics versus geosynthetic reinforced sand

Now, theoretical research on geosynthetic reinforcement lags behind engineering practice. In order to help choosing geosynthetic type and comprehending the geosynthetic reinforcement mechanism, systematic triaxial compression tests were made for the sand reinforced by five kinds of geosynthetics. It was obtained different effects of various geosynthetics on the shear strength and the stress-strain behaviors of the sand. Experimental results show: (1) the stress and strain tendency of the sand reinforced by various geosynthetics is different; (2) geotextiles are likely to be suited for projects allowing high displacement, PET warp knitting geogrids and oriented geogrids for projects allowing medium displacement, glass fiber warp knitting geogrids for projects allowing low displacement and geonets for secondary projects; (3) the confining effect of sand to act on different kinds of geosynthetics varies largely.