粗粒土回弹特性试验研究 English Version
Experimental study on resilience behaviour of coarse grained soils
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摘要: 对2种粗粒土4种级配料进行了卸载–再加载的三轴固结排水剪试验，比较分析其强度变形特性与单调加载三轴试验条件下特性的差异。重点研究不同试验粗粒料的回弹模量取值规律，分析了回弹模量与初始模量、围压和应力水平等之间的关系。结果表明，围压对回弹模量影响较大而应力水平的影响相对较小；粗粒土的回弹模量约为初始模量的2.5～5.0倍，比目前对黏土等认识的1.5～3.0倍明显大。试验结果为邓肯–张模型等非线性弹性模型甚至弹塑性模型的回弹模量的合理取值提供了重要试验依据。Abstract: A number of unloading and reloading triaxial CD tests on two kinds of coarse grained soils with 4 types of grain distribution are performed. The differences of behaviour of strength and stress-strain between the test results from monotonic loading CD tests and unloading-reloading CD tests are analyzed. The value of resilience modulus for different soils is investigated, and the relationships among the modulus of resilience, the initial Young’s modulus, the confining pressure and the stress level are analyzed. It is found that the confining pressure influences the modulus of resilient evidently, and the effect of stress level on it is not so strong. The modulus of resilient of coarse grained soil is about 2.5~5.0 times the initial Young’s modulus, and is much greater than that of 1.5~3.0 times which is known for clays. The present findings provide an important support for the determination of the modulus of resilienes for Duncan-Chang model or other elasto-plastic models.
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Keywords:
- coarse grained soil /
- triaxial test /
- unloading and reloading /
- modulus of resilience
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