Almeida Filipe, Carlos David Miranda, Carneiro José Ricardo, Lopes Maria de Lurdes
Construct-Geo, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
Materials (Basel). 2019 Oct 30;12(21):3558. doi: 10.3390/ma12213558.
The behaviour of materials used for developing engineering structures should be properly foreseen during the design phase. Regarding geosynthetics, which are construction materials used in a wide range of engineering structures, the installation on site and the action of many degradation agents during service life may promote changes in their properties, endangering the structures in which they are applied. The evaluation of the damage suffered by geosynthetics, like installation damage or abrasion, is often carried out through laboratory tests. This work studied the behaviour of five geosynthetics (three geotextiles and two geogrids) after being individually and successively exposed to two degradation tests: mechanical damage under repeated loading and abrasion. The short-term mechanical and hydraulic behaviours of the geosynthetics were analysed by performing tensile tests and water permeability normal to the plane tests. Reduction factors were determined based on the changes occurred in the tensile strength of the geosynthetics. Findings showed that mechanical damage under repeated loading and abrasion tended to affect the mechanical and hydraulic properties of the geosynthetics and that the reduction factors calculated according to the traditional method may not be able to represent accurately the damage suffered by the materials when exposed successively to the degradation mechanisms.
在设计阶段，应正确预测用于开发工程结构的材料的性能。对于土工合成材料，它们是广泛应用于各种工程结构中的建筑材料，现场安装以及使用寿命期间多种降解因素的作用可能会促使其性能发生变化，从而危及它们所应用的结构。对土工合成材料所遭受的损害（如安装损伤或磨损）的评估通常通过实验室测试来进行。这项工作研究了五种土工合成材料（三种土工织物和两种土工格栅）在分别且相继经受两种降解测试后的性能：反复加载下的机械损伤和磨损。通过进行拉伸试验和垂直于平面的水渗透性试验，分析了土工合成材料的短期力学和水力性能。根据土工合成材料拉伸强度的变化确定了折减系数。研究结果表明，反复加载下的机械损伤和磨损往往会影响土工合成材料的力学和水力性能，并且按照传统方法计算的折减系数可能无法准确表示材料在相继经受降解机制时所遭受的损害。
