基于响应面法的聚丙烯高强土工格室拉伸性能

Tensile Properties of Polypropylene High Strength Geocell Based on Response Surface Method

为研究土工格室整体抗拉承载力与条带抗拉承载力、节点抗拉承载力之间的力学响应关系,采用双轴拉伸试验测定了不同高度、焊距的高强土工格室在不同加载速度下的破坏承载力;利用节点抗拉承载力与条带抗拉承载力之间的匹配关系,给出了土工格室抗拉承载力的设计参考值;采用响应面多因素试验分析法,研究了土工格室双轴拉伸承载力和变形对各影响因素的响应规律.结果表明:双轴拉伸试验中高强土工格室的破坏均发生在节点处,工程设计时应重点关注;对土工格室整体抗拉承载力的影响程度由大到小为土工格室高度>土工格室焊距>加载速度,研究结果可以为工程设计中土工格室的技术指标选择提供理论依据.

To study the mechanical response relationship between the overall tension of geocell and the tension of geocell strips and nodes,the biaxial tensile test was used to measure the maximum breaking tension of high⁃strength geocell with different heights and different cell welding pitches when they were tested at different loading velocity.The design reference value of geocell tension was given by using the matching relationship between node strength and strip tension.The response law of the biaxial tension and deformation of the geocell to various influencing factors was studied by the response surface multi⁃factor test analysis method.The results show that the failures of the high⁃strength geocell in the biaxial tensile test all occur at the nodes,and the actual engineering design should be paid attention.The degree of influence of the three factors on the overall strength of the geocell is geocell height>geocell weld pitch>loading velocity,the research results can provide a theoretical basis for the technical index selection of the geocell in engineering design.