泥浆中水分形态对抗剪强度与流变性的影响

摘要

Mud is a soil-water dispersion system with high water content,which is an important component affecting the engineering properties of mud.In this paper,the influence of bound water content and free water content on the shear strength and rheology of slurry was studied by adjusting the content of free water and bound water.Results show that different water form (bond water and free water) has different effect on the shear strength and rheology of slurry.The shear strength,yield stress and plastic viscosity of slurry decrease with the increase of free water content,while increase with the increase of bound water.At low water content,the bound water content is the dominant factor affecting the shear strength and theology of the slurry;but with the increase of water content,free water content gradually takes the leading role,which means that free water content has a greater effect on slurry properties.The results could be used as reference for type selection of slurry.%泥浆是一种高含水率的土水分散系,水分是影响其工程性质的重要成分.从水分形态的角度出发,通过室内调配不同结合水含量和自由水含量的泥浆,研究了结合水与自由水含量对泥浆抗剪强度和流变性的影响.结果表明,结合水和自由水2种形态的水分对泥浆抗剪强度和流变性的影响并不相同;泥浆的抗剪强度、屈服应力和塑性黏度均随着自由水含量的增加而减小,随着结合水含量的增加而增大;在低含水率条件下,影响泥浆抗剪强度和流变性的主要水分因素是结合水含量,而随着含水率逐渐增加,自由水含量逐渐占据主导作用,此时自由水含量对泥浆性质的影响更大.研究成果可为合理选择泥浆提供参考.