Slope stability simulation of dry sludge pile in high-dimensional landfill operation
MI Qiong1, DAI Shi-jin1, ZHANG Rui-na3, DENG Yue1, XU Qing4, ZHAO You-cai1,2
1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, China;
3. Shanghai Institute for Design & Research on Environmental Engineering, Shanghai 200232, China;
4. Shanghai Laogang Solid Waste Disposal Co., Ltd., Shanghai 201302, China
High-dimensional landfill can resolve the conflict between increased amounts of sewage sludge and landfill land demand. However, slope stability of the sludge pile by high-dimensional landfill operation remains unclear. Dry sludge, which has a relatively low moisture content (60%), high compressive strengths and hear strength, was landfilled and simulated with the GEO-SLOPE software in our research. Results showed that a smaller landfill slope gradient enhanced the stability of sludge pile, and correspondingly led to a higher allowable landfill height and a larger increase of the capacity. The optimal slope gradient of Laogang simulated landfill unit may be 1:3.5, correspondingly the maximum allowable landfill height evaluated to be 28 m with an increase of the capacity of 4.472 million m3.
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