水土保持通报2025，Vol.45Issue(2)：22-29,8.DOI:10.13961/j.cnki.stbctb.2025.02.003
干密度对低水力梯度下花岗岩崩积土饱和渗流特征的影响
Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient
摘要
Abstract
[Objective]The seepage behavior of granite colluvial soil under a low hydraulic gradient was explored,in order to provide a scientific basis for regional engineering construction and geological disaster prevention and mitigation.[Methods]Constant head permeability tests were conducted on granite colluvial soil with varying initial dry densities to analyze its seepage characteristics under low hydraulic gradient.[Results]The relation curves between seepage velocitiy(v)and hydraulic gradient(i)(v-i)of granite colluvial soil exhibits varying degrees of seepage fluctuation under low hydraulic gradients.The permeability coefficient increases with the hydraulic gradient across all dry density conditions.When the hydraulic gradient reached the critical hydraulic gradient(icr),the permeability coefficient remained stable and undergoes approximately linear seepage.At this time,the permeability coefficient decreases logarithmically with the increase of dry density.Additionally,under low dry density conditions,the transition in the critical hydraulic gradient fluctuates significantly.However,when the dry density exceeds 1.5 g/cm3,the critical hydraulic gradient(icr)increases linearly with dry density.[Conclusion]The saturated seepage behavior of granite colluvial soil under different dry density conditions exhibits fluctuation characteristics under a low hydraulic gradient.The internal mechanism driving these fluctuations is closely related to variations in pore structure.These findings offer a novel perspective on the seepage process of granite colluvial soil and provide a reference for consolidation analysis and seepage stability calculation in engineering applications.关键词
干密度/花岗岩崩积土/低水力梯度/波动性/临界水力梯度Key words
dry density/granite colluvial soil/low hydraulic gradient/fluctuation/critical hydraulic gradient分类
建筑与水利引用本文复制引用
罗桂鹏,蒋秀姿,杨贵清,董辉..干密度对低水力梯度下花岗岩崩积土饱和渗流特征的影响[J].水土保持通报,2025,45(2):22-29,8.基金项目
国家自然科学基金面上项目"坡积相裂隙性多孔介质逾渗相变的渗流稳定差异研究"(42272304) （42272304）
湖南省教育厅优秀青年项目"盐环境下花岗岩残积土结构—渗流响应双尺度机制研究"(24B0125) （24B0125）
