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首页> 外文期刊>Waste management & research >Protective effect of overlying geosynthetic on geomembrane liner observed from landfill field tests and inclined board laboratory experiments
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Protective effect of overlying geosynthetic on geomembrane liner observed from landfill field tests and inclined board laboratory experiments

机译：从填埋场试验和斜板实验室实验观察到，上覆土工合成材料对土工膜衬层的保护作用

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Geosynthetic liner systems are generally installed in landfill sites to prevent toxic leachate from escaping into the adjoining environment by utilizing their impervious characteristics. Therefore, it is important to protect the geomembrane from being damaged or destroyed during all phases of landfilling, namely landfill construction, waste tipping and landfill closure. This paper presents firstly the observed performance of a geomembrane liner from a landfill site where the geomembrane liner was installed on the slopes of a Korean landfill; and secondly the results of an inclined board laboratory test. Two types of experiments were conducted to identify the protecting effect of the overlaying geosynthetic on the geomembrane liners. At a testing landfill site, the slope consisted of three different sub-inclines and two 2-m-wide intermediate levels. The sub-inclines were each 8 m in vertical height and their angle of inclination was 1 : 1.5 (vertical : horizontal). The reported observations were made for a time period of approximately 1 year, until the landfill was filled with wastes to the top of the uppermost slope. In addition, inclined board laboratory tests were carried out. During the inclined board test, a base table is inclined slowly and steadily until the block located on the base table starts to slide, when the tension and displacements of two geosynthetics, namely the geomembrane liner and protecting geotextile, are measured. In conclusion, test results showed that the down-drag force generated by waste accumulation and sliding of upper material was to a large extent dissipated through the elongation of the protecting geosynthetic overlying the geomembrane and thus was not transferred to the geomembrane. Unless the protecting geosynthetic undergoes structural failure, this stress relaxation phenomenon continues to occur so that the magnitude of tensile force to be applied on the geomembrane remains marginal.
机译：土工合成材料衬里系统通常安装在垃圾填埋场中，以利用其不渗透的特性防止有毒渗滤液渗入相邻的环境。因此，重要的是要保护土工膜在垃圾填埋的所有阶段（即垃圾填埋场建设，废物倾倒和垃圾填埋场关闭）不被损坏或破坏。本文首先介绍了在一个韩国垃圾填埋场的斜坡上安装了土工膜衬垫的垃圾填埋场观察到的土工膜衬垫的性能；其次是斜板实验室测试的结果。进行了两种类型的实验，以确定覆盖的土工合成材料对土工膜衬层的保护作用。在一个测试垃圾掩埋场，该坡度由三个不同的子坡度和两个2米宽的中间水位组成。子倾斜面的垂直高度均为8 m，倾斜角为1：1.5（垂直：水平）。所报告的观测值进行了大约一年的时间，直到垃圾填埋场被垃圾填满到最上坡的顶部为止。此外，还进行了斜板实验室测试。在斜板测试过程中，当测量两种土工合成材料（土工膜衬层和土工织物）的张力和位移时，基台缓慢稳定地倾斜，直到位于基台上的砖块开始滑动。总之，测试结果表明，由于堆积在土工膜上的保护土工合成材料的伸长，在很大程度上耗散了由废物堆积和上部材料的滑动所产生的下降阻力，因此并未转移至土工膜。除非保护性土工合成材料遭受结构破坏，否则这种应力松弛现象将继续发生，从而使施加在土工膜上的拉力大小保持很小。

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