岩土工程学报2025，Vol.47Issue(11)：2408-2415,8.DOI:10.11779/CJGE20240600
密集固-液两相颗粒流流变特性及黏/惯性界限试验研究
Experimental investigation of rheological behavior and viscous-inertial boundary in dense solid-liquid two-phase granular flows
摘要
Abstract
The dynamic processes of geological disasters,such as debris flows and shallow landslides,are essentially characterized by dense solid-liquid two-phase granular flows.Due to the complex interaction mechanism between the solid and liquid phases,its rheological properties are extremely complex.The μ(I)and μ(J)constitutive models are proposed to describe the rheological behavior for dry granular flows and solid-liquid two-phase granular flows,respectively.However,these models have been proposed based on free surface or very low normal stress conditions(generally<1 kPa),and ideal granular materials(e.g.,plastic/metal/glass spheres)are used.These conditions(stress range and material properties)deviate significantly from those encountered in real-world geohazard scenarios.Therefore,experiments are conducted using a rheometer equipped with a designed shear chamber,capable of applying normal stresses ranging from 5 kPa to 20 kPa and shear strain rates from 0.1 s⁻1 to 360 s⁻1 to granular materials under long-distance shearing.We utiliz zirconia beads and quartz sand as granular materials,and water and silicone fluid as interstitial fluids to simulate a range of solid-liquid two-phase flow conditions.Test results demonstrate that high-viscosity interstitial fluids significantly enhance the friction coefficient of granular flows,especially under high-speed shear.It is found that the μ(I)constitute effectively characterizes flow behavior when the viscosity of the dry granular material or interstitial fluid is low,while the μ(J)constitute is more suitable for high-viscosity interstitial fluids.Based on these physical simulation experiments,specific dimensionless boundary parameters are proposed to delineate viscous and inertial flow regimes.Furthermore,based on the differences in dominant physical mechanisms,appropriate constitutive models can be adopted to achieve a more accurate description of the macroscopic dynamic processes of such geological hazards.关键词
密集固-液两相颗粒流/流变试验/流变学本构/无量纲参数Key words
dense solid-liquid two-phase granular flow/rheometer experiment/rheological constitutive/dimensionless parameter分类
土木建筑引用本文复制引用
杨晓霞,李延,胡伟..密集固-液两相颗粒流流变特性及黏/惯性界限试验研究[J].岩土工程学报,2025,47(11):2408-2415,8.基金项目
国家自然科学基金杰出青年科学基金项目(42325703) （42325703）
国家自然科学基金项目(42477207) （42477207）
四川省科技计划资助项目(2021JDTD0014,2024NSFSC1980)This work was supported by National Natural Science Foundation of China(NSFC)Outstanding Youth Science Fund Project(Grant No.42325703),National Natural Science Foundation of China(NSFC)Project(Grant No.42477207),and Sichuan Provincial Science and Technology Program Project(Grant Nos.2021JDTD0014,2024NSFSC1980). （2021JDTD0014,2024NSFSC1980）
