城市生活垃圾的力学性能测试与分析

人工处理台州市黄岩区生活垃圾土试样,分析组分后作固结和直接剪切实验。结果表明:在试样的孔隙比一定时,其瞬时沉降量随含水率的提高而增加,前期增加速度更快;e-lg p曲线兼有黏性土和密实砂土曲线特征;剪应力随剪切位移呈现逐渐硬化的曲线;抗剪强度与法向应力基本成直线关系,符合库仑定律;当含水率在40%～50%时,随含水率增加,黏聚力明显增大,内摩擦角减小。

Analysis and Measurement on Mechanical Properties of Municipal Solid Waste

For the artificially treated municipal solid waste in Huangyan district of Taizhou city,the consolidation test and direct shear test are carried out after composition analysis.Experimental results show that at a definite void ratio,the instantaneous settlement of the treated waste increases with the increasing of water content and increases faster at the early stage,and its e-lgp curve has the characteristics of both clay and compacted sand.The shear stress-displacement curve shows a gradual hardening trend.The shear strength and vertical stress have a linear relationship and meet with Coulomb’s law.When the water content is 40% ～ 50%,the cohesion increases while the internal friction angle decreases with the increasing of water content.