基于渗压实验的济南典型粉质黏土渗透特性  

Permeability Characteristics of Typical Silty Clay in Jinan Based on Osmotic Pressure Experiment

作　　者：付青华 刘燕[1,2] 周祥 刘勇 李海波 FU Qinghua;LIU Yan;ZHOU Xiang;LIU Yong;LI Haibo(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;The Engineering Technology Research Center for Urban Underground Engineering Support and Risk Monitoring of Shandong Province,University of Jinan,Jinan 250022,Shandong,China;China Railway 14th Bureau Group Big Shield Engineering Co.,Ltd.,Nanjing 211803,Jiangsu,China;Shandong Chambon Construction Group Co.,Ltd.,Jinan 250014,Shandong,China;The Workers’Cultural Palace of Changyi City,Weifang 261300,Shandong,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]济南大学山东省城市地下工程支护及风险监控工程技术研究中心,山东济南250022 [3]中铁十四局集团大盾构工程有限公司,江苏南京211803 [4]山东尚邦建设集团有限公司,山东济南250014 [5]昌邑市工人文化宫,山东潍坊261300

出　　处：《济南大学学报(自然科学版)》2025年第2期221-227,共7页Journal of University of Jinan(Science and Technology)

基　　金：山东省自然科学基金项目(ZR2022ME042)。

摘　　要：为了探讨济南14-1层典型粉质黏土渗透系数各向异性的内在机制,基于渗压实验并结合扫描电子显微镜技术,研究不同固结压力条件下该土层的渗透特性及微观结构特征,得出土层的渗透系数各向异性与固结压力、孔隙结构的关系。结果表明:在室内常规渗透实验中,该土层在竖直方向的渗透系数大于水平方向的,并且竖直方向的渗透系数平均值是水平方向的1.64倍;随着固结压力的增大,粉质黏土的渗透系数逐渐减小,并且竖直方向的渗透系数始终大于水平方向的,在固结压力为500 kPa时,竖直方向的渗透系数增至水平方向的近5倍,体现出土层在不同方向的结构性差异;原状土的渗透系数显著大于重塑土的,在固结压力为100 kPa时,原状土的渗透系数约为重塑土的5.5倍,突显了土层结构性对渗透特性的显著影响;扫描电子显微镜图像进一步揭示了土层中的空间网状孔隙和孔洞结构,竖直方向的不均匀孔隙和裂隙结构有利于竖向渗流;固结压力的增加导致土层孔隙减小,颗粒间接触更紧密,从而使渗透阻力增大。To explore internal mechanism of permeability coefficient anisotropy of 14-1 layer typical silty clay in Jinan,permeability characteristics and microstructure characteristics of the soil layer under different consolidation pressures were researched on the basis of osmotic pressure experiment and scanning electron microscopy technology,and the relationship between permeability coefficient anisotropy of the soil layer and consolidation pressure as well as pore structure was obtained.The results show that in indoor conventional permeability experiment,the permeability coefficient of the soil layer in vertical direction is greater than that in horizontal direction,and the average permeability coefficient in vertical direction is 1.64 times of that in horizontal direction.With the increase of consolidation pressure,the permeability coefficient of silty clay gradually decreases,and the permeability coefficient in vertical direction is always greater than that in horizontal direction.When the consolidation pressure is 500 kPa,the permeability coefficient in vertical direction increases to nearly 5 times of that in horizontal direction,reflecting structural difference of the soil layer in different directions.The permeability coefficient of undisturbed soil is significantly greater than that of remolded soil.When the consolidation pressure was 100 kPa,the permeability coefficient of undisturbed soil is about 5.5 times of that of remodeled soil,which highlights significant influences of soil structure on permeability characteristics.Scanning electron microscope images further reveal spatial reticular pore and pore space structures in the soil layer.Uneven pore and fissure structures in vertical direction are conducive to vertical seepage.The increase of consolidation pressure leads to the decrease of soil layer pores and tighter contact between particles,so that the permeability resistance increases.

关 键 词：地下工程 渗透系数 渗压实验 粉质黏土 各向异性 

分 类 号：TU41[建筑科学—岩土工程]