| 探地雷达结合钻孔探测采煤塌陷区土壤剖面层次及含水率 |
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| 引用本文： | 吴志远,彭苏萍,崔凡,聂俊丽.探地雷达结合钻孔探测采煤塌陷区土壤剖面层次及含水率[J].农业工程学报,2019,35(14):243-251. |
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| 作者姓名： | 吴志远 彭苏萍 崔凡 聂俊丽 |
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| 作者单位： | 1. 中国矿业大学<北京>煤炭资源与安全开采国家重点实验室，北京 100083;,1. 中国矿业大学<北京>煤炭资源与安全开采国家重点实验室，北京 100083;,1. 中国矿业大学<北京>煤炭资源与安全开采国家重点实验室，北京 100083;,2. 贵州大学国土资源部喀斯特环境与地质灾害重点实验室，贵阳 550025; |
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| 基金项目： | 中国矿业大学(北京)煤矿资源与安全开采国家重点实验室项目(SKLCRSM17KFA06) |
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| 摘 要： | 为分析煤层开采对地层结构及含水率的影响,利用探地雷达对西部煤矿开采区开采前后地表浅层土壤剖面、土壤含水率分布特征进行了探测研究。通过钻孔地质编录对雷达探测地层分布进行了矫正,并利用实验室实测含水率验证了雷达探测含水率精度。结果表明:1)雷达探测钻探结果显示,煤矿开采区浅层(10 m)土壤介质结构从上之下主要包含砂层、黏土层和风化层3类。2)探地雷达探测含水率与实测含水率随深度变化规律相似,4个钻孔两种方法探测所得含水率相关系数分别为0.875、0.88、0.94和0.84,表明探地雷达反演浅部地层含水率的可行性,黏土、含砂黏土的含水率远远大于砂层含水率。3)煤矿开采对浅部地层土壤剖面具有一定影响,但土壤剖面整体不变。煤矿开采后浅层土壤含水率下降明显,第1、3次探测L1测线砂层和黏土层含水率损失率平均为28.26%、12.85%。这表明煤层开采对砂层结构土壤含水率影响较大。第二、四次探测砂层平均含水率分别为5.31%,7.44%,含水率增大2.11%,土壤含水率增大范围在5%～56%之间,平均增大范围为27.89%示。黏土层两次探测含水率分别为11.46%、11.96%,含水率增大0.5%,含水率增大范围在-19.13%～19.59%,平均增大范围为4.79%。即黏土类结构层含水量变化较小,砂层结构含水量变化较大,说明黏土类地层受降雨影响较小,砂层结构地层含水量受降雨影响较大,表明浅部地层土壤水分主要受降雨影响。
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| 关 键 词： | 土壤 含水率 探地雷达 煤矿开采区 |
| 收稿时间： | 2019/1/3 0:00:00 |
| 修稿时间： | 2019/6/9 0:00:00 |
Using ground penetrating radar combined with borehole to detect soil profile and water content in coal mining subsidence area |
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| Wu Zhiyuan,Peng Suping,Cui Fan and Nie Junli.Using ground penetrating radar combined with borehole to detect soil profile and water content in coal mining subsidence area[J].Transactions of the Chinese Society of Agricultural Engineering,2019,35(14):243-251. |
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| Authors: | Wu Zhiyuan Peng Suping Cui Fan and Nie Junli |
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| Institution: | 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China;,1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China;,1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China; and 2. Key Lab of Karst Environment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550025, China; |
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| Abstract: | In this study, to analyze the influence of coal seam mining on formation structure and water content, ground penetrating radar (GPR) combined with borehole sampling was firstly used to detect and analyze the change of shallow stratum medium and its structure in the process of coal mining. Then the soil water content of different soil media in the shallow strata of coal mining area is determined by GPR and sampling. Finally, the changes of strata structure and moisture content of different soil media under the influence of coal seam mining conditions is compared. The objectives of this research were to analyze 1) the change of the sedimentary structure of the shallow strata before and after coal mining, and determine the influence of coal mining on the soil profile of the shallow strata; 2) the influence of coal mining on the distribution of soil moisture in surface soil; and; 3) the relationship between different soil media and soil moisture content in shallow strata under coal mining conditions to provide scientific basis for reclamation after mining. The radar detection drilling results showed that the soil medium structure of the shallow layer (< 10 m) in the mining area of coal mine mainly included sand layer, clay layer and weathering layer from the top to the bottom. The water cut detected by GPR was similar to the measured water cut with depth. The correlation coefficients of water cut detected by the two methods for the four boreholes were 0.875, 0.88, 0.94 and 0.84, respectively. The results also showed that the water content of clay and sand clay was much higher than that of sand. Coal mining had a certain impact on the shallow soil profile, but the soil profile remained unchanged. After coal mining, the water content of shallow soil decreased significantly. The water content of sand layer in L1 measured in the 1st and 3rd times decreased by 2.15% on average, and the water content loss rate was 28.26% on average. The moisture content loss rate of clay layer in the first and third detection was 12.85% on average. This showed that coal mining had a great influence on soil moisture content of sand structure. The average moisture content of the sand layer detected in the second and fourth times was 5.31% and 7.44%, respectively. The increase range of moisture content was between 5% and 56%, and the average increase range was 27.89%. The water content of clay layer detected twice was 11.46% and 11.96%, respectively, with an increase of 0.5%, 19.13% - 19.59% and an average increase of 4.79%. That was to say, the moisture content of clay structure layer changes little while that of sand structure changed greatly. This indicated that the clay stratum was less affected by rainfall and the water content of sand stratum wsa more affected by rainfall. The shallow soil moisture was mainly affected by rainfall. |
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| Keywords: | soils water content ground penetrating radar systems coal mining area |
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