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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。
In order to study the stress-strain characteristics during the shear process of lignin-stabilized silt soil, a theoretical model for describing the shear characteristics of the solidified soil was established based on the principle of energy conservation by analyzing the energy required for the soil at different stages of the shearing process. Analyze the significance of the parameters contained in the model and determine the method, verify the validity of the model according to the indoor test results, and explore the applicability of the model. The results show that the energy required for the shearing of the cemented soil with cementation characteristics consists of three parts: the energy of cementing between the particles, the energy of particle rolling and the energy of particle sliding; the model considers the cementation, particle shape and soil Shear failure mode and other factors. The results of direct shear test of lignin-cured silt verified the accurate description of the shear properties of the model. The proposed model can provide a new way for the study of strength characteristics of solidified soil.