Abstract
In order to reveal the impact of a high concentration of CO2 on the soil in the coal mining subsidence area, the surface above the goaf before CO2 injection is regarded as a subsidence area model. Based on the actual vertical depth of 70∼80 m shallow buried coal seam geological conditions, CO2 diffusion in the goaf is regarded as a short-term high-concentration CO2 leakage model. The surface soil samples before and after 60 tons of direct injection of liquid CO2 in the goaf of Huojitujing in the Daliuta Coal Mine could be collected to conduct the experimental observation. By measuring the changes in the five indicators of soil air-dried and fresh sample including pH, available nitrogen, available potassium, water-soluble salt, and total organic carbon, the changes of pH and mineral content in the soil could be analyzed quantitatively and qualitatively at different time periods before and after CO2 injection. This proves that the injection of CO2 into the goaf has an impact on the chemical properties of the surrounding soil.
Highlights
In the analysis and research of soil chemical properties in subsidence areas, most scholars study the influence of subsidence on soil chemical properties by analyzing soil nutrients. e uneven surface and ground fissures formed by the collapse cause soil nutrients to migrate to the goaf or low-lying areas under the action of runoff, resulting in a nonuniform distribution of soil nutrients and adversely affecting the growth of plants in the collapsed area
Wang et al have shown through research that the collapse reduces the total nitrogen and organic matter content of the soil, increases the total phosphorus content, and does not change the total potassium content significantly [3]. e available nitrogen, phosphorus, and potassium content all show varying degrees of loss [3]
Fresh soil samples are called fresh samples, which generally refer to soil samples used for analysis and testing immediately after being collected from the field or after cryopreservation
Summary
In the analysis and research of soil chemical properties in subsidence areas, most scholars study the influence of subsidence on soil chemical properties by analyzing soil nutrients. e uneven surface and ground fissures formed by the collapse cause soil nutrients to migrate to the goaf or low-lying areas under the action of runoff, resulting in a nonuniform distribution of soil nutrients and adversely affecting the growth of plants in the collapsed area. Shun et al measured the soil nutrient content of coal mining subsidence in the Baili Rhododendron forest area and found that: the collapse significantly reduced the soil available phosphorus, available potassium, and organic matter content and increased the total soil nutrient and available nitrogen content [1]. Zhang et al studied that the collapse significantly reduces the content of total nitrogen, total phosphorus, and available potassium [2]. Wang et al have shown through research that the collapse reduces the total nitrogen and organic matter content of the soil, increases the total phosphorus content, and does not change the total potassium content significantly [3]. Many scholars have made corresponding studies on the law of soil nutrient loss caused by the collapse. Many scholars have made corresponding studies on the law of soil nutrient loss caused by the collapse. e
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
