Experimental Study on Mechanical Design Method of a Liner in Waste Landfill

为了估计由废料沉降引起的土工膜的下拉力的量，进行了许多离心模型试验。将观测到的下曳力与用Koerner方法计算的下曳力进行了比较。结果表明，Koerner法可能低估了土工膜的热应力，即使土工膜顶面与底面摩擦性能相等，也能产生实际的下拉力。推导了考虑弹性模量随温度变化和土工膜从覆盖土中脱出的弹性公式，并通过陷土模型试验，估算了下卧地基可能发生局部沉降时土工膜中的应变分布。观察到的应变呈钟形分布。为了估算土工膜混凝土锚的锚固能力，在试验现场进行了模型试验。锚体开始向上移动时的力对应于土工膜与锚体前壁土体之间的摩擦力。

In order to estimate a amount of downdrag force of geomembrane induced by the settlement of waste materials, many centrifugal modeled tests were conducted. The observed downdrag forces were compared with the calculated by the Koerner's method which is popular formula for this problems. As the results, it is found that the Koerner' s method may underestimate and the downdrag force can practically create even when the frictional property on the top surface of geomenbrane is equal to that on the bottom surface.In order to establish a formula of thermal stress which creates in a geomembrane, the modeled tests were conducted outside. An elastic formula was derived which considered the variation of elastic modulus with temperature and slipping out behavior of the geomembrane from a cover soil.In order to estimate the strain distribution induced in geomembrane when the underlying base ground may subside partially, trapped model tests were conducted. The observed strains show that they distribute like a bell shape. It is found that the Trough Model method may underestimates the maximum strain.In order to estimate a amount of anchorage ability of the concrete anchor of a geomembrane, modeled tests were carried in the test field. The force when the anchor concrete began to move upward corresponded to frictional force between a the geomembrane and the front wall soil of anchor dig.