基于统一硬化参量的原状饱和黏土的结构性本构模型

doi:10.13722/j.cnki.jrme.2018.1356

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摘要根据饱和结构性黏土特有的剪胀特点，基于统一硬化参数，对原有的超固结土UH模型进行修正，使之适用于反映结构性土的应力–应变关系，主要结论如下：(1) 通过将屈服面在p-q坐标系中向左平移，得到能用来反映具有一定拉伸强度特性的屈服面，且由于屈服面左端位于原点左侧，为了能够描述随体应变发展而造成的胶结强度的损失规律，建议一个屈服面左侧移动的演化方程；(2) 通过引入状态参量来描述体变剪缩到剪胀转换时所对应的变相应力比强度特性，使得体变大小以及体变转换规律符合不同胶结程度而变化的特点；(3) 对于结构性土在剪缩下的大体积剪缩特点，提出结构性应力比参量R*，并给出基于R*的结构性潜在强度的关系式。使用上述潜在强度来修正统一硬化参数，并最终得到了能反映结构性土应力–应变关系的简单模型，可以用来反映结构性土的高应力比强度特性，胶结特性随体变逐渐损失特点，大体积剪缩，伴随着胶结损失而产生的应变软化，剪缩、剪胀等主要变形特性。

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	万征1
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	秋仁东1
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	宋琛琛4

关键词 ：土力学, 结构性黏土, 剪胀, 应力&ndash, 应变关系, 强度, 状态参量

Abstract：Based on the characteristics of saturated structural clays and the uniform hardening(UH)parameter，the UH model was modified to reflect the stress-strain relationship of the structural clay. The improved model has the following features：(1) the yield surface being shifted to the left in the p-q coordinate system can reflect certain tensile strength characteristics and，because of that the left end of the yield surface is located to the left of the origin point，the loss law of the cementation strength caused by the development of the volume strain can be described by a proposed evolution equation of left movement of the yield surface，(2) by introducing the state parameter χ to describe the variation of the strength of the phase transformation stress ratio corresponding to the moment when the volume strain changes from shrinkage to dilatation，the volume strain amount and the transformation rule can be determined according with different cementation degrees，and (3) for the characteristics of large volume shear contraction of structural clays under loading，a structural stress ratio parameter R* and a formula of the structural potential strength based on R* were proposed. By using the potential strength to revise UH parameter，a simple model for describing the stress-strain relationship of structural clays was obtained，which reflects the following characteristics including the high stress ratio strength，gradual decrease of the cementation strength along with the volume contraction，large volume shear shrinkage，strain softening accompanied by cementation loss，shear shrinkage and dilatancy.

Key words： soil mechanics structural clay dilatancy stress-strain relationship strength state parameter

引用本文:

万征1，2，3，秋仁东1，2，3，宋琛琛4. 基于统一硬化参量的原状饱和黏土的结构性本构模型[J]. 岩石力学与工程学报, 2019, 38(9): 1905-1918.
WAN Zheng1，2，3，QIU Rendong1，2，3，SONG Chenchen4. A structural constitutive model of undisturbed saturated clays based on#br# the uniform hardening parameter. , 2019, 38(9): 1905-1918.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1356 或 http://www.rockmech.org/CN/Y2019/V38/I9/1905

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