中文摘要：

为研究木质素固化粉土剪切过程中的应力–应变特征,基于能量守恒原理,通过对剪切过程不同阶段土体所需能量进行分析,建立用以描述固化土剪切特性的理论模型,分析模型中所含参数的意义和确定方法,根据室内试验结果验证模型的有效性,并探讨模型的适用性。研究结果表明,具有胶结特性的固化土发生剪切所需能量主要由破坏土颗粒间胶结的能量、颗粒滚动的能量和颗粒滑动的能量3个部分组成;模型考虑胶结作用、颗粒形状和土体剪切破坏形式等因素;木质素固化粉土的直剪试验结果验证了模型对其剪切特性的准确描述。所提模型可为固化土强度特性的研究提供新的途径。

英文摘要：

To research the stress-strain behaviors of lignin stabilized silt during shearing process,the energy required to shear the stabilized soil during different stages was analyzed based on the energy conservation. A theoretical model was developed to depict the shear behaviors of stabilized soil,and the meaning and calculation method of parameters of the model were presented. The model was verified based on the laboratory testing results,and the limitations and applicability of the model were also discussed. The energy required to shear the stabilized soil with cementation is mainly made up of the energy required to break the inter-particle bonds,the energy required for a particle to roll and the energy required for a particle to slide. The cementation between particles,the shape of soil particles,the failure forms of shearing and other factors are considered in the proposed model. The proposed model depicts accurately the shear behaviors of stabilized soil from the direct shear tests on lignin treated silt.