饱和分散性土变形特性试验研究  

Deformation Properties of Saturated Dispersive Clay

作　　者：史祥[1,2] 樊恒辉[1] 刘刚[1] 李普[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]中冶南方工程技术有限公司,武汉430223

出　　处：《长江科学院院报》2016年第9期87-92,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51379177;51579215);中央高校基本科研业务费专项资金项目(ZD2013013)

摘　　要：目前,人们对于分散性土的研究主要集中在分散性土的鉴定、抗渗和改性等方面,而对其变形特性方面的研究很少。针对此现状,采用单向压缩试验研究了不同压实度下饱和分散性土的变形特性。试验结果表明:饱和分散性土的变形既与应力有关,也与时间有关,且具有明显的非线性特征;压实度对饱和分散性土的变形有显著的影响。试验数据的统计分析表明,饱和分散性土的应力-应变、应变-时间关系均可用幂函数的形式来表述;据此,建立了饱和分散性土的加荷本构模型和蠕变本构模型。通过对模型预测值与实测值的对比分析,发现该模型能够较合理地预测饱和分散性土的变形特性。Dispersive clay is of low erosion resistance and impermeability,and severely endangers the safety of water conservancy construction as it has high dispersion in low salinity water. At present,research of dispersive clay mainly focuses on the identification,impermeability and modification; however,studies on the deformation properties are rare. In this paper,the deformation behavior of saturated dispersive clay under different degrees of compaction was studied through uniaxial compression tests. The test results show that the deformation of dispersive clay depends not only on the stresses exerted on them but also the time elapsed,and has obvious nonlinear characteristics. The results also indicate that the degree of compaction has significant effect on the deformation of saturated dispersive clay. According to the test results,the stress-strain and strain-time curves of saturated dispersive clay can be expressed with the power function. The loading constitutive model and creep constitutive model were established,and the comparison between model predicted result and measured result indicates that the predicted result using the model are in reasonable agreement with the test data.

关 键 词：饱和分散性土 变形特性 单向压缩试验 幂函数 本构模型 

分 类 号：TU411[建筑科学—岩土工程]