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三轴试验和直接剪切试验是研究垃圾土强度特性的主要方法,通过人工配制垃圾土、标准砂掺纤维土、现场垃圾土重塑样的三轴试验和直接剪切试验,发现垃圾土的剪切应力应变(或位移)曲线表现为持续硬化型,在应变达到一定数值后曲线有锯齿状波动;经过国内相关试验成果的分析,得到垃圾土的强度参数主要受干密度的影响,且有较好的相关性。研究结果表明:垃圾土的强度包线可以用双线强度包线来表达,黏聚力和内摩擦角取决于是否填埋碾压;直接剪切试验结果介于三轴固结不排水和固结排水试验结果之间,且接近于三轴固结不排水试验结果;直接剪切试验更准确地模拟了垃圾团间的滑动摩擦特性,用直接剪切试验确定垃圾土的强度参数更合理;同时建议了三轴试验破坏应变和直接剪切试验破坏位移。
Triaxial test and direct shear test are the main methods for studying the strength characteristics of landfill soil. Triaxial tests and direct shear tests of manually prepared landfill, standard sand-doped fiber soil and on-site landfill soil remodeling samples show that landfill soil After the strain reached a certain value, the curve has jagged fluctuations. After analyzing the related test results in China, the strength parameters of the rubbish soil are mainly affected by the dry density, and there are Good correlation. The results show that the strength envelope of landfill can be expressed by double-line strength envelope, and the cohesion and internal friction angle depend on whether the landfill is compacted or not. The direct shear test result is between the three-axis consolidation undrained and solidified Results of the drainage test are close to the results of triaxial consolidation undrained test. The direct shear tests more accurately simulate the sliding friction characteristics between litter groups, and the direct shear test is more reasonable to determine the strength parameters of rubbish soil. At the same time, three-axis test is recommended to destroy the strain and direct shear test to destroy the displacement.