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To control the landfill stability during the expansion phase, the factors affecting the landfill stability were analyzed by numerical simulation. Take Qizishan landfill expansion project for example, with the field experiment data of the old solid waste, the strength characteristics and constitutive model of old solid waste were studied. Analyzing the stability of landfill with strength reduction finite differential method by FLAC3D, several critical factors were found have affected the stability of landfill expansion, such as shear strength parameters, elevation of percolate water surface, landfill height, landfill gradient, etc. Studies show that, affecting the landfill stability significantly, the strength of old solid waste and the elevation of percolate water surface should be controlled during the expansion building and management stage

Analysis of Stability and Control in Landfill Sites Expansion