结构性土非线性压缩特征本构模型

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刘文化,孙阳,张洪勇,孔纲强,李吴刚,孙秀丽.结构性土非线性压缩特征本构模型[J].,2022,62(5):501-508

结构性土非线性压缩特征本构模型

Constitutive model for nonlinear compression behavior of structured soils

DOI：10.7511/dllgxb202205008

中文关键词:结构性土压缩曲线非线性本构模型

英文关键词:tructured soils compression curve nonlinearity constitutive model

基金项目:国家自然科学基金资助项目(5200904951709129)；江苏省自然科学基金资助项目(BK20170187)；岩土力学与堤坝工程教育部重点实验室开放基金资助项目(2020004).

作者	单位
刘文化,孙阳,张洪勇,孔纲强,李吴刚,孙秀丽

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中文摘要:

由于结构性的破坏，在孔隙比和有效应力半对数坐标平面内，结构性土的压缩曲线表现出明显的非线性特征．通过分析结构性土的典型形成过程，对有效应力进行修正，以考虑结构性土颗粒间的胶结作用，并定义新的代表结构性程度的结构性因子．将结构性土的正常固结压缩指数定义为结构性因子的函数，结合结构性因子的发展式，建立了考虑结构性土非线性压缩特征的增量方程．采用模型对天然原状土与人工胶结土在不同剪应力比下的固结试验进行模拟．结果表明所提增量方程能够很好地表述结构性土的如下特征：结构性土屈服前压缩性较小，屈服后压缩性迅速增大且表观压缩性大于重塑土；随着荷载增加，结构性土的压缩曲线最后会逐渐趋近于重塑土的压缩曲线；结构性土的压缩曲线随剪应力比增大逐渐下移．所提模型能够较为合理地描述天然原状土以及人工胶结土的压缩特征．

英文摘要:

In the void ratio against effective stress semi-logarithmic coordinate plane, the compression curve of structured soils behaves nonlinearity due to the degradation of structure. By analyzing the typical formation process of structured soils, the effective stress is modified to account for the inter-particle cementation of structured soils, and the structural factor representing the degree of structure is newly defined. The normally consolidated compression index of structured soils is assumed to be a function of the structural factor. By introducing an evolution law for the structural factor, an incremental equation considering the nonlinear compression behavior of structured soils is established. Compression tests for natural soils and artificial cementing soils with various shear stress ratios are simulated by model. The results show that the following characteristics of structured soils can be described well by the proposed incremental equation: The structured soils remain relatively intact before yielding, whereas, the compressibility increases rapidly and the apparent compressibility of structured soils is larger than that of reconstituted soils after yielding; With the increasing of applied stress, the compression curve of structured soils finally approaches the compression curve of reconstituted soils; The compression curve of structured soils with large shear stress ratio is located below that with small shear stress ratio. The proposed model is qualified in describing the compression behavior of both natural soils and artificial cementing soils.

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结构性土非线性压缩特征本构模型

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