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《》 1986-03
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THE MECHANISM OF HUGE LANDSLIDES IN OVERCONSOLIDATED CLAY NEAR LONGYANG GORGE DAMSITE

Liu Hanchao;Zhang Zhuoyuan  
The geologic background, characteristic features and mechanism of agroup of huge landslides occurred along the right bank slopes of the YellowRiver near the Longyang Gorge damsite are studied. Attention is paid tothe development and final linking up of the slip surfaces. It is suggestedthat these surfaces were originated from creep sliding along the beddingplanes near the foot of slope and tension fracturing along vertical joints atthe top of slope and final shearing at the middle part of the sliding mass.The progressive failure plays an important role in these processes. Basedupon the statistical data in the field nd through correlation analysis, thecritical depth of the tension fracture (h_cr) is derived, its potential possi-bility in delineation the critical slopes and in prediction of their stabilitiesis suggested. The main factor which causes the high speed and excessivedistance of these slides are also discussed briefly.
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