水盐条件下混合钠盐盐渍土的地质雷达波形  

Waveform Properties of Ground Penetrating Radar for Mixed Sodium Saline Soil with Certain Water Content and Salt Volume

作　　者：温世儒 吴霞[2] Wen Shiru;Wu Xia(School of Architectural and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,P.R.China;School of Architecture Engineering,Jiangxi College of Applied Technology,Ganzhou,Jiangxi 341000,P.R.China)

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000 [2]江西应用技术职业学院建筑工程学院,江西赣州341000

出　　处：《地下空间与工程学报》2021年第6期1944-1951,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41272285);江西省教育厅科学技术研究青年项目(GJJ170564);江西省教育厅科学技术研究重点项目(GJJ204903)。

摘　　要：盐渍土在天然状态下的含水率与含盐量具有不定性,为了研究粗粒混合钠盐盐渍土的地质雷达波形特征,根据含水率和含盐量调配了4组模型填土;采用SIR-3000地质雷达配备900 MHz天线对模型填土实施探测,并据此获得探测彩色图像及其初步特征;为了对彩色图像及其初步特征进行验证,基于实际场地实施现场实测。结果表明:影响彩色图像特征的主要因素是含水率,当含水率大于35%时,探测彩色图像变得模糊不清并具有“斑点状”特征,无法继续开展有效的解译分析,低频特征明显且主频不超过中心频率的1/3;当含水率低于20%时,电磁反射的强度随含盐量的增加而增强,探测图像反射明显且清晰可见,可读性良好。研究结果能为基于地质雷达的粗粒混合钠盐盐渍土的无损探测提供一定的参考与借鉴。The water content and salt volume of saline soil in natural state are uncertain.In order to study the waveform properties of GPR(Ground Penetrating Radar)for coarse mixed sodium salt saline soil,four groups of model fills were allocated according to water content and salt content.The SIR-3000 GPR equipped with 900 MHz antenna was used to measure the model fill,and the detection color image and its preliminary properties were obtained.In order to verify the color image and its preliminary properties,the on-site measurement was taken based on the actual site.The results show that the main factor affecting the color image features is the water content.When the water content is more than 35%,the detected color image becomes blurred and has"speckled"features,which cannot be effectively interpreted.The main frequency is less than 1/3 of the center frequency,and the low frequency features are obvious.When the water content is less than 20%,the intensity of electromagnetic reflection increases with the increase of salt content,and the reflection of the detection image is obvious,clear and readable.The results can provide useful reference for nondestructive detection of coarse mixed sodium salt saline soil based on GPR.

关 键 词：盐渍土 地质雷达 模型试验 实测 波形特征 

分 类 号：TU195.2[建筑科学—建筑理论]