| 单井注水改变填埋场中垃圾土温度的模拟 |
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| 引用本文： | 章涛,施建勇,吴珣,韩尚宇,纪晓磊,张慧华.单井注水改变填埋场中垃圾土温度的模拟[J].岩土力学,2022,43(2):499-510. |
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| 作者姓名： | 章涛 施建勇 吴珣 韩尚宇 纪晓磊 张慧华 |
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| 作者单位： | 1. 南昌航空大学 土木建筑学院，江西 南昌 330063；2. 河海大学 岩土工程科学研究所，江苏 南京 210098；
3. 河海大学 岩土力学与堤坝工程教育部重点实验室，江苏 南京 210098 |
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| 基金项目： | 国家自然科学基金(No.42002286,No.41877222,No.42002288,No.52068054,No.12062015);南昌航空大学博士启动基金(No.EA201911397)。 |
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| 摘 要： | 为了加速填埋场降解的稳定化，渗滤液回灌常被应用在工程实践中。使用竖井进行回灌是较为有效的方式之一。伴随着液体的注入，由于对流的产生，垃圾土温度势必会发生改变。基于无锡填埋场注水试验，对该现场试验过程中垃圾土温度的改变进行模拟。为此，建立了考虑渗透系数和孔隙率随深度变化的渗流模型，以及考虑渗流影响的热对流-热传导模型，并利用数值计算方法进行求解。在对比计算值和试验值之后，发现所建立的模型能较好地模拟注水期间渗滤液水位和垃圾土温度的变化规律。结果表明：在离注水井超过6 m处的位置，显现的液位相对滞后，至少滞后0.15 d，而且距离越远滞后的时间越长；在液位以下，注水井周围的垃圾土温度均低于初始温度。但是在径向上远离注水井3.6 m之外的垃圾土温度并不是全低于初始温度，在新老垃圾土交界处之上2 m范围内，会出现温度高于初始温度的现象，温度差可达3 ℃；新填垃圾土的已降解时长对单井注水工况下温度分布的影响较为显著。
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| 关 键 词： | 填埋场 垃圾土 注水 温度 模拟 |
| 收稿时间： | 2021-08-03 |
| 修稿时间： | 2021-12-01 |
Simulation of waste temperature changed by single well water injection in a landfill |
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| ZHANG Tao,SHI Jian-yong,WU Xun,HAN Shang-yu,JI Xiao-lei,ZHANG Hui-hua.Simulation of waste temperature changed by single well water injection in a landfill[J].Rock and Soil Mechanics,2022,43(2):499-510. |
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| Authors: | ZHANG Tao SHI Jian-yong WU Xun HAN Shang-yu JI Xiao-lei ZHANG Hui-hua |
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| Institution: | 1. School of Civil Engineering and Architecture, Nanchang Hangkong University, Nanchang, Jiangxi 330063, China;
2. Geotechnical Engineering Research Institute, Hohai University, Nanjing, Jiangsu 210098, China;
3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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| Abstract: | To accelerate the stabilization of degradation in landfills, leachate recirculation is often used in practical engineering, and recirculation using a vertical well is one of the more effective ways. With the injection of liquid, the temperature in the waste will change due to convection. In this study, the variation of waste temperature during the field test was first simulated based on the water injection test in the Wuxi landfill. A seepage flow model considering the variations in permeability and porosity with depth as well as a thermal convection-thermal conduction model considering the effect of seepage flow were then established, which were used to calculate the seepage and thermal convection-conduction processes of the landfill in numerical simulation. Comparison of theoretical and numerical results shows that the established models can well simulate the variations of leachate level and waste temperature during the water injection. The results are as follows: The leachate level is relatively lagged in the position more than 6 m away from the injection well, at least 0.15 days behind, and the farther the distance, the longer the lag time. Below the leachate level, the waste temperature around the injection well is lower than the initial temperature. However, the waste temperature 3.6 m away from the injection well in the radius direction is not all below the initial temperature. The temperature will be higher than the initial temperature within 2 m above the new and old waste junction, where the temperature difference can reach 3 ℃. The waste degraded time significantly affects temperature distribution under single well water injection. |
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| Keywords: | landfill waste water injection temperature simulation |
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