摘要
模拟复垦机械对试验区土壤进行不同程度的压实,在探地雷达获取土壤介电常数的基础上,检验并修正了4种经典复合介电常数模型,并结合野外试验对修正后的模型通用性进行了验证。结果表明,土壤介电常数与土壤压实指标(土壤紧实度、容重、孔隙率等)相关系数>89%,可以表征土壤压实状况;原有复合介电常数模型虽然存在误差不能直接使用,但模型计算值与实测值相关系数>0.99,修正后二者拟合误差<1%;在野外试验中,基于修正后的介电常数模型反算的土壤压实指标(容重、孔隙率)与实验室测量值误差率<5%,通用性较好。表明在科学布设测线以保证探地雷达准确获取土壤介电常数的前提下,可以通过修正后的复合介电常数模型对煤矿区复垦土壤压实状况进行全面客观的评价。
The study stimulated reclamation machine to make different degrees of compaction on soil in research area, based on dielectric constant obtained by ground penetrating radar, and 4 kinds of classic composite dielectric constant models were detected and modified, combined with field experiment for verification of universality of modified models. The results showed that when correlation coefficients of soil dielectric constant and soil compaction parameters （soil compaction, bulk density, porosity, etc） were larger than 89%, which could indicate soil compaction condition. The original composite dielectric constant model had errors and could not be used directly, but the correlation coefficient of model calculated value and measured value was larger than 0.99, and their fitting error was less than 1% after modification. In field experiment, the error rates of soil compaction parameters （bulk density and porosity） obtained through reverse calculation of modified dielectric constant model and the measured values were less than 5%, showing good universality. The results showed that under the premise of scientifically laying test lines to ensure ground penetrating radar to accurately obtain soil dielectric constant, the comprehensive and objective compaction evaluation of reclamation soil in coal mining district could be made through the use of modified composite dielectric constant model.
出处
《水土保持学报》
CSCD
北大核心
2016年第4期318-322,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41171425)
山东省高等学校科技计划项目(J15LF58)
关键词
复垦土壤
压实指标
介电常数模型
探地雷达
reclamation soil
compaction index
dielectric constant model
ground penetrating radar
