关中平原湿陷性黄土渗透特性试验研究  

Experimental study on permeability characteristics of collapsible loess in Guanzhong Plain

作　　者：杨俊 严耿升[1] 胡向阳[1] 赵成[1] 韦佳 YANG Jun;YAN Geng-sheng;HU Xiang-yang;ZHAO Cheng;WEI Jia(Power China Northwest Survey and Design Research Institute Co.,Ltd.,Xi'an 710000,Shaanxi,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710000

出　　处：《地下水》2022年第5期160-163,169,共5页Ground water

摘　　要：黄土的湿陷性和渗透性相互影响,黄土的湿陷是由水的渗透浸润引起的,而渗透特性又直接决定着湿陷的发生和发展。本研究采用现场双环渗透试验以及原状样室内变水头渗透试验,对关中平原湿陷性黄土渗透特性进行了研究。研究发现黄土的结构、构造以及土体成分是影响黄土渗透性的重要因素,黄土的干密度和孔隙比对其渗透系数影响较大,黄土湿陷后,渗透系数明显变小。现场渗透试验测得的非饱和渗透系数大于室内试验测得的饱和渗透系数,现场渗透试验更贴近于工程实际。The collapsibility and permeability of loess affect each other. The collapsibility of loess is caused by water infiltration, and the permeability directly determines the occurrence and development of collapsibility. In this paper, the seepage characteristics of collapsible loess in Guanzhong plain were studied by double ring seepage tests in situ and variable head penetration test of undisturbed loess in laboratory. It is found that the structure and composition of the loess are important factors affecting the permeability, and the dry density and pore ratio have a great influence on the permeability coefficient of loess. After the loess collapses, the permeability coefficient decreases significantly.Theunsaturated permeability coefficient measured by field permeability test is larger than laboratory permeability test results, and the field permeability test is closer to the engineering practice.

关 键 词：湿陷性黄土 渗透特性 关中平原 

分 类 号：P642.131[天文地球—工程地质学]