含钙质砂无粘性土的渗透特性试验及经验模型  

Experimental and Model Study on Permeability Characteristics of Cohesionless Soil with Carbonate Sand

作　　者：钱财富[1] 宋新江[1] 马露 QIAN Cai-fu;SONG Xin-jiang;MA Lu(Anhui&Huaihe River Institute of Hydraulic Research,Bengbu 233000,China;College of Architecture,Anhui Science and Technology University,Bengbu 233000,China)

机构地区：[1]安徽省·水利部淮河水利委员会水利科学研究院,安徽蚌埠233000 [2]安徽科技学院建筑学院,安徽蚌埠233000

出　　处：《水电能源科学》2023年第3期128-131,共4页Water Resources and Power

基　　金：安徽省教育厅重点研究项目(KJ2021A0020);安徽省优秀拔尖人才培育项目(gxyq2022052);安徽科技学院科研发展基金(811500);2021博士稳定人才项目(BSWD202104)。

摘　　要：为进一步分析含钙质砂无粘性土的渗透特性,采用南海钙质砂与细颗粒石英粉作为试验材料配置试验土样,利用GDS高压三轴仪试验系统和常水头渗透仪,开展钙质砂含量、初始孔隙比和有效应力对无粘性土的渗透特性影响研究,并建立考虑有效应力的渗透系数经验模型。试验结果表明,钙质砂含量低于40%时,土颗粒结构为无粘性土基质,孔隙结构由细颗粒土决定;钙质砂土样结构为砂颗粒骨架结构,渗透系数量级显著增大;随有效应力的增加,试样渗透系数呈幂函数降低;建立含钙质砂无粘性土的渗透系数经验模型,模型参数与土样性质关系密切,计算值与试验值吻合度较好。研究结果可为工程实践提供参考。In order to further analyze the permeability characteristics of cohesionless soil containing carbonate sand, South China Sea carbonate sand and fine grain quartz powder were used as test materials to prepare test soil samples. The GDS high-pressure triaxial apparatus test system and constant head permeameter were used to carry out research on the influence of carbonate sand content, initial void ratio and effective stress on the permeability characteristics of cohesionless soil. And then an empirical model of permeability coefficient considering effective stress was established. The test results show that when the content of carbonate sand is less than 40%, the grain structure is cohesionless soil matrix, and the pore structure is determined by fine grained soil;The structure of carbonate sand sample is the skeleton structure of sand particles, and the magnitude of permeability coefficient increases significantly;With the increase of effective stress, the permeability coefficient of the sample decreases significantly. An empirical model for the permeability coefficient of cohesionless soil with carbonate sand was established. The model parameters were closely related to the properties of the soil sample. The calculated values were in good agreement with the test values. The research results can provide reference for practical projects.

关 键 词：钙质砂 无粘性土 渗透系数 有效应力 经验模型 

分 类 号：TV139.11[水利工程—水力学及河流动力学] TU43[建筑科学—岩土工程]