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Abstract A geomechanical model experiment on Qianjiangping landslide in the Three Gorges Reservoir area is conducted. Taking microseism and centigrade meters as the main experiment gauging methods，the mechanism of the landslide is studied and the feasibility of landslide is forecast by micro-seismic monitoring. The experimental results show that the strong rainfall before the initial reservoir impoundment period has little influence on the landslide stability；and the uplifting pressure due to the reservoir water will only induce the creeping of landslide，while the shear strength reduction of slippery zone by attenuation of water immersion is the true failure cause of the landslide. The microseismic events achieved from the experiment display the distortion-breakage-destruction process of landslide clearly，revealing the slippery zone destruction process that is from the toe to the middle of landslide；and the feasibility of landslide forecast by microseismic monitoring is verified.
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Received: 18 November 2009
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