文章摘要
温世儒.粗粒混合钠盐盐渍土的地质雷达探测适用性研究[J].地质与勘探,2020,56(5):1031-1039
粗粒混合钠盐盐渍土的地质雷达探测适用性研究
Detection applicability of the ground penetrating radar in coarse grained mixed sodium saline soil
投稿时间:2019-10-12  修订日期:2020-06-11
DOI:10.12134/j.dzykt.2020.05.011
中文关键词: 道路工程 盐渍土 地质雷达 波形 探测适用性
英文关键词: road engineering, saline soil, ground penetrating radar, waveform, detection applicability
基金项目:国家自然科学基金项目(编号:41272285)和江西省教育厅科学技术研究项目(编号:GJJ170564) 联合资助
作者单位E-mail
温世儒 江西理工大学建筑与测绘工程学院江西赣州 江西应用技术职业学院建筑工程学院江西赣州 okwpnit@126.com 
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中文摘要:
      为了研究粗粒混合钠盐盐渍土的地质雷达探测适用性,在室内制作了2×1.0×1.5m的人工模型箱,通过人工配制的方式调配了4组具有不同含水率和含盐量的模型填土;采用900MHz的屏蔽式天线对模型填土进行探测并由此获得相应的探测图像,通过图像特征对探测适用性进行初步判定;为了对初步判定进行验证,以西安市杨凌北部黄土台塬区为实验场地进行现场探测,综合分析表明:含水率是影响探测适用性的主要因素,当含水率大于35%时,不论含盐量多少,探测图像模糊不清,均具有“斑点状”特征,难以进行有效判读,且回波主频集中,主频不超过中心频率的1/3,低频特征明显;当含水率低于20%时,含盐量的增加会显著提高电磁反射的强度,探测图像反射明显,图像清晰可见,可判性良好。研究内容能为粗粒混合钠盐盐渍土的地质雷达现场探测提供相关参考。
英文摘要:
      This work studied the detection applicability of the GPR (ground penetrating radar) in coarse-grained mixed sodium-saline soil. An artificial model box was made (with size of 2×1.0×1.5m) and four sets of model filling soil with different moisture content and salt content were prepared by hand. A 900MHz shielded antenna was used to observe the model filling soil, yielding the corresponding detection images. The detection applicability was preliminarily judged based on the image features. In order to verify such preliminary judgment, an on-site experiment was conducted at the loess tableland in the north of Yangling, Xi’an city. Analysis shows that water content is the main factor affecting the detection applicability. When the water content is greater than 35%, no matter how much salt there is, the detection images are blurry and have "speck-like" characteristics, making it difficult to effectively interpret. Moreover, the echo frequency is concentrated and the main frequency value is less than 1/3 of the center frequency, with obvious low-frequency characteristics. When the water content is less than 20%, the increase of salt content will significantly improve the intensity of electromagnetic reflection, and the detection image reflects clearly, the image is clearly visible, and the judge-ability is good. Results can provide a reference for GPR field detection in coarse-grained mixed sodium-saline soil.
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