Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, People's Republic of China.
Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, People's Republic of China.
Waste Manag Res. 2021 Feb;39(2):351-359. doi: 10.1177/0734242X20958065. Epub 2020 Sep 15.
Slope instability occurs in landfills owing to increased internal temperatures. However, strength characteristic tests for solid waste (SW) and landfill slope stability (SS) calculations that consider temperature variations are scarce in the literature. In this study, we conducted triaxial tests on SW under a range of temperature conditions and proposed the circular slide method (CSM) for calculating SS in consideration of temperature effects. SW cohesion decreased linearly with increasing temperature, whereas the internal friction angle remained essentially unchanged. Our results showed that higher temperatures reduced the SW shear strength, changing the most dangerous sliding arc away from the slope toe. The landfill slope safety factor decreased by more than 20% with an increase of the maximum temperature from 20°C to 50°C. Reduction of the leachate level (LL) led to a decrease in the landfill high-temperature zone and the safety factor increased according to LL and temperature distribution. If cooling pipes are used to control the SW temperature, we recommend arranging the cooling pipes on the landfill liner. The proposed CSM can be used to analyse landfill SS.
由于内部温度升高，垃圾填埋场会发生边坡失稳。然而，文献中很少有考虑温度变化的固体废物（SW）和填埋场边坡稳定性（SS）计算的强度特性试验。在本研究中，我们对 SW 进行了一系列温度条件下的三轴试验，并提出了考虑温度影响的圆形滑动法（CSM）来计算 SS。SW 的黏聚力随温度的升高呈线性降低，而内摩擦角基本保持不变。结果表明，较高的温度降低了 SW 的抗剪强度，使最危险的滑动弧从边坡趾部发生偏离。随着最高温度从 20°C 增加到 50°C，垃圾填埋场边坡安全系数降低了 20%以上。降低渗滤液水平（LL）会导致垃圾填埋场高温区的减少，根据 LL 和温度分布，安全系数会增加。如果使用冷却管来控制 SW 温度，我们建议在填埋场衬垫上布置冷却管。所提出的 CSM 可用于分析填埋场 SS。
