木质素磺酸钙对分散土水力-力学特性影响  

Influence of calcium lignosulfonate on hydraulic-mechanical properties of dispersed soil

作　　者：张晓飞[1] 李佳超 陈新炜 邓红艳 周红波[4] ZHANG Xiaofei;LI Jiachao;CHEN Xinwei;DENG Hongyan;ZHOU Hongbo(School of Water Resources and Hydropower,Xi′an University of Technology,Xi′an,Shannxi 710048,China;Gansu Water Resources and Hydropower Survey,Design and Research Institute Co.,Ltd.,Lanzhou,Gansu 730000,China;Xianyang Water Conservancy Work Team,Xianyang,Shannxi 712046,China;Xi′an University of Technology Survey&Design Institude of Water Conservancy,Hydropower&Architecture Co.,Ltd.,Xi′an,Shannxi 710048,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000 [3]咸阳市水利工作队,陕西咸阳712046 [4]西安理工大学水利水电建筑勘测设计有限公司,陕西西安710048

出　　处：《排灌机械工程学报》2025年第2期170-177,201,共9页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51479168);陕西省水利厅科技计划项目(2020SLKJ-12)。

摘　　要：传统的土壤改性剂(如石灰、水泥、石膏和粉煤灰等)对土壤水力-力学特性有一定的改善,但对环境有一定的破坏作用.以一种生物环境友好型材料—木质素磺酸钙(以下简称木素)作为改性剂,开展了针孔试验、碎块试验、钠离子交换百分比试验、界限含水率试验、无侧限抗压强度试验、直接剪切试验、渗透试验和核磁孔隙度试验,研究了木素掺量、干密度、含水率对天然分散土的分散性和水力-力学特性的影响.结果表明:木素掺量为3%和4%时,改性土样呈非分散性,且干密度越大,分散性越差;随着木素的掺入,土样的液限、塑限、塑性指数降低;木素掺量为2%,对土样的无侧限抗压强度、抗剪强度及渗透性改善效果最好,而木素掺量过大时,土样的水力-力学特性变差;T_(2)谱呈现双峰结构,随着木素掺量的增加,主峰逐渐向右移动,土样的小孔隙孔径变大,大孔径孔隙数量增多.Traditional soil modifiers(such as lime,cement,gypsum,fly ash,etc.)have improved the hydraulic-mechanical properties of soils to some extent,but they have as well damaged the environment to some extent.Taking calcium lignosulfonate(hereinafter referred to as lignin)as modifier,pinhole test,fragment test,sodium ion exchange ratio test,boundary water content test,unconfined compressive strength test,direct shear test,permeability test,and nuclear magnetic resonance porosity test were carried out to study the effects of lignin content,dry density,and water content on the disper-sibility and hydraulic-mechanical properties of natural dispersive soil.The results show that when the lignin content is 3%and 4%,the modified soil sample is non-dispersive,and the higher the dry density,the worse the dispersibility.With the addition of lignin,the liquid limit,plastic limit and plastic index of soil samples decrease.When the content of lignin is 2%,the unconfined compressive strength,shear strength,and permeability of soil samples experiences best improvement,but when the content of lignin is too large,the hydraulic-mechanical characteristics of soil samples become worse.T_(2)spectrum presents a bimodal structure.With the increase of lignin content,the main peak gradually moves to the right,the small pore size of soil samples becomes larger,and the number of large pore sizes increases.

关 键 词：分散性土 木质素磺酸钙 改性土 水力-力学特性 孔隙演化特征 

分 类 号：TU411[建筑科学—岩土工程] TV641.25[建筑科学—土工工程]