软土地基加筋用土工织物双向拉伸试验试样选型及其优化设计

在利用土工织物加固的软土地基工程中,土工织物处在双向受拉的一种力学状态,因此很有必要研究土工织物双向拉伸状态下的力学特性。根据现有的试验设备提出了9种不同型式的土工织物双向拉伸试样模型,借助有限元计算软件,对9种不同试样在双向拉伸条件下的受力情况进行了数值分析,并结合材料自身特点给出了各种试样优劣的评价原则及评价指标,通过对各个试样的指标值的对比分析,选取试样4作为备选试样,并采用控制变量的方法得到了试样4的关键尺寸与评价指标的函数关系。最后,通过定义目标函数的方法获得了目标函数取得最小值时试样尺寸的最优解。

Selecting and Optimizing Biaxial Tensile Testing Specimen of Soft Clay Foundation Reinforcing Geotextile

Geotextile is under the mechanical status of biaxial tension in the construction of foundation pit engineering reinforced by geotextile. So, it is necessary to explore the biaxial tensile properties of the geotextile. Nine different types of geotechnical fabric biaxial tensile specimen were put forward according to the existing test equipment. The mechanical properties of nine different specimens were analyzed by using finite element software. Combined with the characteristics of the material itself, the evaluation principle and index were obtained. Through the comparative analysis of each specimen, the sample 4 was selected as the alternative specimen. The control variable method was used to determine the functional relationship between the key size and evaluation index. Finally, an optimal sample size was obtained by using the goal function.