摘要
通过室内模型试验,研究了饱和入渗条件下黄土垂直节理对土体渗透性的影响。在实验室自制试验装置,将重塑土击实后人工切割垂直节理。在土样表面均匀喷水,使水分在土样表面饱和的状态下入渗,分析节理开度对黄土中水分入渗的影响规律。试验表明:闭合节理对土体的渗透性影响很小,实际中可以不予考虑;随着节理开度的增大,节理对土体渗透性的影响逐渐趋于明显,节理成为优势渗流面。将黄土中的节理抽象为两平行板间的缝隙,节理内水的流动满足N-S方程。考虑黄土渗流的实际特点确定了边界条件,通过推导建立了黄土节理渗透系数的表达式,分析了黄土节理渗透系数随土体体积含水量变化的特点。在数值计算中,采用四边形等参元离散土体。在离散体表面规定水头边界,对节理场地的水分场变化进行了分析。分析结果与试验对比,说明该表达式可以反映黄土节理渗流的实际特点。
The influence of vertical joint on the permeability of loess was studied by model test. The test equipment was designed to load the loess. The vertical joint was also cut to simulate the real one. Spray the water evenly on the entire surface of loess,so that the water could infiltrate in a saturated situation. The fact of joint aperture was taken consideration. The model test showed that closed joint had little influence on the infiltration,and it could be ignored. With the increase of the joint aperture,the influence of joint on the permeability of loess became obvious.The joint face could be regraded as advantage seepage surface. The joint in the loess could be abstracted as the parallel plate model. The water movement in the joint followed the N-S equation. The boundary conditions were decided,considering the actual character of loess permeability. The expression was derived and proposed to describe the permeability coefficient of loess joint. Moreover,how it changed with volumetric water content was discussed. In the numerical calculation,the joint loess was divided by quadrilateral isoparametric element. The dirichlet boundary condition was given on the surface of discrete bodies,the water field of joint loess was analyzed.By comparing the results of model test and numerical analysis,the expression could reflect the seepage character of loess joint.
作者
张风亮
罗扬
朱武卫
田鹏刚
周庚敏
刘栩豪
刘俊
ZHANG Fengliang;LUO Yang;ZHU Wuwei;TIAN Penggang;ZHOU Gengmin;LIU Xuhao;LIU Jun(Shaanxi Institute of Architecture Science,Xi’an 710082,China;School of Civil Engineering,Xi’an University of Architecture & Technology,Xi’an 710055,China)
出处
《工业建筑》
CSCD
北大核心
2019年第1期14-20,共7页
Industrial Construction
基金
陕西省科技统筹创新工程计划项目(2016KTZDSF04-04)
陕西省建筑科学研究院资助项目((2014)1-222)
关键词
黄土节理
饱和入渗
渗透系数
数值分析
loess joint
saturated infiltration
permeability coefficient
numerical analysis
