發(fā)布時間：2018-03-16 10:46

  本文選題：重構(gòu)土壤　切入點：煤矸石　出處：《水土保持學報》2017年04期 　論文類型：期刊論文

【摘要】：為研究煤礦區(qū)用矸石作為墊底基質(zhì)進行土壤剖面重構(gòu)土壤水分再分布過程和剖面熱擴散與氣體濃度變化特征,以指導工程設計和重構(gòu)土壤熟化技術應用,在實驗室設計了一種煤礦區(qū)重構(gòu)土壤水氣熱運移模擬裝置,通過布設在土柱系統(tǒng)不同深度的溫濕度傳感器和CO_2濃度檢測儀,連續(xù)監(jiān)測重構(gòu)土壤剖面含水量、溫度和CO_2濃度。結(jié)果表明:煤矸石層具有良好的阻水性,阻礙水分的入滲,增加上層土壤的持水能力。但是,煤矸石的持水性差,煤矸石層的含水量低于土壤層10%左右;煤矸石具有更佳的熱擴散性,在加熱過程中煤矸石層的溫度遠大于土壤層,在重構(gòu)土壤中容易形成穩(wěn)定的溫度梯度,尤其在煤矸石層與土壤層之間存在明顯的溫度差。土壤層的溫度受底部加熱的影響較小,短期內(nèi)主要受室溫影響,其變化曲線與室溫日變化曲線基本一致,最大波動幅度在2.89℃;底部通CO_2對土壤層CO_2濃度的影響非常小,氣體在煤矸石層向土壤層擴散時容易受到土壤層的阻隔,導致氣體在土壤層下界面累積;煤矸石層會對鄰近土壤層產(chǎn)生較大影響,影響微生物的生存環(huán)境,導致微生物的活性下降。當覆土厚度為60cm時,煤矸石層對土壤層的影響較小,隨著覆土厚度的增加,煤矸石的影響會逐漸削弱。
[Abstract]:In order to study the process of soil moisture redistribution and the characteristics of heat diffusion and gas concentration change in soil profile reconstruction by using gangue as base substrate in coal mine area, the application of engineering design and reconstruction soil ripening technology was studied in order to guide the engineering design and reconstruction of soil maturation technology. A simulation device for soil moisture and heat transfer in coal mine reconstruction was designed in the laboratory. The moisture content of reconstructed soil profile was continuously monitored by placing a temperature and humidity sensor and a CO_2 concentration detector at different depths of the soil column system. The results of temperature and CO_2 concentration show that the coal gangue layer has good water resistance, hinders the infiltration of water and increases the water holding capacity of the upper soil. However, the water holding capacity of the coal gangue is poor, and the water content of the coal gangue layer is lower than that of the soil layer about 10%; Coal gangue has better thermal diffusivity. The temperature of coal gangue layer is much higher than that of soil layer during heating process, and a stable temperature gradient is easily formed in the reconstruction of soil. Especially, there is a significant temperature difference between the coal gangue layer and the soil layer. The temperature of the soil layer is less affected by the bottom heating, but mainly by the room temperature in the short term, and the variation curve is basically consistent with the diurnal change curve of the room temperature. The maximum fluctuation range is 2.89 鈩，

本文編號：1619586