杭州市固体垃圾的直接剪切试验研究

The Results of Direct Shear Test for Municipal Solid Waste in Hangzhou

采集杭州8个垃圾中转站的垃圾,分析目前杭州市固体垃圾的成分,并由此将固体垃圾的构成分为三大类:不可压缩的固体材料、难降解的"加筋"材料和容易降解的材料,其比例分别为35%、15%和50%。人工配制固体垃圾,利用新研制的固体废弃物专用直接剪切仪器,进行直接剪切试验,并对试验结果进行分析。结果表明:固体垃圾的剪应力随剪切位移而呈现一条逐渐硬化的曲线,抗剪强度与上覆正应力的关系可以拟合为一条直线,其规律符合库仑定律。固体垃圾的天然内聚力为6.2 kPa,天然内摩擦角为16.1°。

The ingredient of municipal solid waste is studied based on the waste of the eight transit station in Hangzhou.The materials of the waste are divided into three parts： the incompressible solid materials;the reinforced materials difficult to biodegradation and the materials easy to biodegradation,and their proportion are 35%,15% and 50% respectively.The direct shear testing is proceeded by new development large scale testing instrument for the artificial municipal solid waste samples,and the testing data is obtained.The results show that the relationship between the shear stress and the shear displacement is a curve of hardening growth,and the relationship between shear strength and the normal stress on the waste is linear,and it is in accordance with the law of Coulomb.The cohesion force is 6.2kPa,and the internal frictional angle is 16.1 degree.