结构性对西澳残积土固结性质的影响

Influence of Soil Structure on Consolidation Properties of Western Australian Residual Soil

为分析结构性对西澳残积土固结性质的影响,使用西澳大学LoadTrac-Ⅲ固结仪对西澳残积土的原状土和重塑土分别进行单向固结试验,研究了西澳残积土的结构性对其压缩曲线和固结系数的影响。结果表明,西澳残积土的原状土压缩曲线位于重塑土的上方,即在某一固结压力下,原状土的孔隙比比重塑土更大;西澳残积土较强的结构性使得原状土的屈服应力大于现场有效应力;西澳残积土的原状土的固结系数远大于重塑土的固结系数;西澳残积土的重塑土的固结系数和固结压力之间呈双曲线关系。研究成果可为西澳当地和国内同类工程的设计与施工提供参考。

In order to study the influence of soil structure on the consolidation property of the Western Australian residual soil,the oedometer tests were performed on both the intact and reconstituted soil by the LoadTrac-Ⅲconsolidometer in the University of Western Australia.The influence of soil structure on the compression curve and the coefficient of consolidation of the Western Australian residual soil was investigated.The test results show that the compression curve of the intact soil lies above that of the reconstituted soil of the Western Australian residual soil and for a given consolidation pressure the void ratio of the intact soil is larger than that of the reconstituted soil.The obvious soil structure of the Western Australian residual soil causes that the yield stress of the intact soil is larger than the in-situ effective stress.The coefficient of consolidation of the intact soil of the Western Australian residual soil is much larger than that of the reconstituted soil.The coefficient of consolidation of the reconstituted soil of the Western Australian residual soil and the consolidation pressure is a hyperbolic relationship.The research results could provide reference for the design and construction of local and similar domestic projects.