基于固结试验的高原湖相沉积泥炭土渗透特性研究  

Research on permeability characteristics of plateau lake sedimentary peat soil based on consolidation test

作　　者：欧明喜[1] 张鹏 韩忠玉 Ou Mingxi;Zhang Peng∗;Han Zhongyu(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Liangshan Branch,State Power Investment Corporation Sichuan Electric Power Co.,Ltd.,Xichang 615000,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]国家电投集团四川电力有限公司凉山分公司,四川西昌615000

出　　处：《工程勘察》2024年第11期7-13,共7页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(51968036).

摘　　要：随着中国昆明地区的快速发展,泥炭土地基的处置需求日益增多。为了明确高原湖相沉积泥炭土在固结过程中的渗透特性及其影响因素,通过固结试验方法测定六个场地的渗透系数kv,分析固结压力P、孔隙比e及有机质含量wu等因素对其渗透性能的影响并建立了渗透模型。试验结果表明:在逐级加载条件下,泥炭土的渗透系数kv和孔隙比e随固结压力P增大而减小,P越大,kv和e下降幅度越小,且kv的下降主要发生在主、次固结阶段;泥炭土渗透系数kv随有机质含量wu增加而增大,但kv并非单一受wu的影响,还会受到有机质的分解度的影响,不同分解度的泥炭土其孔隙特征和渗透性能均不同;高原湖相沉积泥炭土的渗透系数可选用lg(1+e)-lgkv渗透模型进行计算,能较好反映出e与kv的变化关系。With the rapid development of Kunming,the demand for the disposal of peat soil ground is increasing.In order to determine the permeability characteristics and influencing factors of plateau lacustrine sedimentary peat soil during the consolidation process,the permeability coefficient kv of six sites was measured by consolidation test.The influence of consolidation pressure P,porosity e,and organic matter content wu on its permeability performance was analyzed,and a permeability model was established.The experimental results show that under stepwise loading conditions,the permeability coefficient kv and porosity e of peat soil decrease with the increase of consolidation pressure P;the higher the pressure P,the smaller the decrease in kv and e,and the decrease in kv mainly occurs in the primary and secondary consolidation stages;the permeability coefficient kv of peat soil increases with the increase of organic matter content wu,but kv is not solely influenced by wu,but also by the decomposition degree of organic matter;peat soils with different decomposition degrees have different pore characteristics and permeability properties;the permeability coefficient of plateau lacustrine sedimentary peat soil can be calculated using the lg(1+e)-lgkv permeability model,which can better reflect the relationship between e and kv changes.

关 键 词：泥炭土 固结试验 有机质含量 渗透系数 渗透模型 

分 类 号：TU411[建筑科学—岩土工程]