基于塌陷裂缝非连续均质的土壤水分扩散物理模拟  

Physical model test on moisture diffusion in discontinuous homogeneous soil with collapse-fissure

作　　者：陈建平 朱哲 吴丽[1] CHEN Jianping;ZHU Zhe;WU Li(College of Mining,Liaoning Technical University,Fuxin, Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《中国地质灾害与防治学报》2018年第2期66-72,共7页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(51404134)

摘　　要：为研究被塌陷裂缝破坏的非连续均质土壤水分扩散情况,分别在水平土柱中设置0.5 mm、1 mm、5 mm、8 mm、11 mm、12 mm、15 mm宽度的裂缝模拟塌陷裂缝进行入渗试验。观测湿润锋值的变化,绘制含水率与Boltzmann参数、土壤水分扩散率的关系曲线,分析裂缝对水分扩散的影响。结果表明:湿润峰经过裂缝后锋面产生明显不一致性,土壤水分扩散方式转变为上升的垂向扩散与水平扩散两种方式并存的二维扩散;λ~θ关系曲线符合Boltzmann模型,裂缝增大了土壤水分扩散程度;通过单因素方差分析与偏相关分析,得出裂缝与土壤水分扩散率呈显著负相关,即随着裂缝的增大土壤水分的水平扩散率逐渐降低,分析土壤水分扩散率与含水率关系曲线,将试验结果分成四种情况评价裂缝对土壤水分扩散率的降低情况。研究成果为塌陷区土地复垦提供了参考。The paper studies the moisture diffusion in discontinuous homogeneous soil damaged by the collapsefissure. The infiltration experiments were conducted in horizontal soil columns to simulate the collapse-fissure.The horizontal soil columns set fissures with widths of 0. 5 mm、1 mm、5 mm、8 mm、11 mm、12 mm、15 mm,respectively. The study draws the relation curves of water content,Boltzmann parameter and soil moisture diffusivity by using the variation of wetting front value,and analysises the influence of fissure on moisture diffusion. The results show that(a） obvious inconsistency exists in wetting front value after fissure,and the diffusion mode of soil water is changed into two dimensional diffusion of vertical diffusion and horizontal diffusion,(b） the relation curve of λ ~ θ fits with the Boltzmann model,and the fissure increases the diffusion degree of soil moisture. Through analyzing the one-way variance and the partial correlation the relationship of fissure and soil moisture diffusivity exist apparent negative correlation,that is,soil horizontal diffusivity reduces with increasing fissure widths. Four types are proposed according to the test results to evaluate the reduce rate of soil moisture diffusion,by analyzing the curves of the soil moisture diffusivity and moisture content. The results provide references for the reclamation of collapse area.

关 键 词：土壤水分扩散 塌陷裂缝 湿润峰 含水率 

分 类 号：S156.1[农业科学—土壤学] P164.1[农业科学—农业基础科学]