Geological Analysis And Geomechanics Analog Study Of Mountain Deformation-Failure Mechanism In High Earthquake-Intensity Area

Our country lies in a region between two most active earthquake belts in the world, where geological disasters resulted from the earthquake occur frequently. The author selects Diexi earthquake area as main examples and makes comparative analysis for geology of mountain deformation-failure in other earthquake areas affected by the earthquake, and conducts the study on geomechanics model vibration test. As a result, the main achievements and recognitions are concluded as follows:1. Summarize typical characteristics and evidences of mountain deformation-failure under other conditions dinstingushed from gravity force, put forward three kinds of typical geomechanics models including consequent rock slope destabilization type, high-steep rock weathering and unloading belt's landslip type and weak base pore water pressure proliferation and destabilization type, and analyze its formation and evolution course.2. Propose that the formation and evolution of mountain deformation-failure affected by the earthquake is the continuation of the evolution formed under gravity force, and the earthquake force plays an important role in sharpening, promoting or inducing the existing deformation-failure further. In addition, the mountain deformation-failure and its stability in high earthquake intensity region formed and distributed by epigenetic time-dependent structure will be controlled by its formation and evolution.3. Study the structural design of vibration test model and material fabricating scheme as well as related measurement technique; and conduct vibration model test for three typical geomechanics models. Consequently, the result is shown as follows:(1) The deformation-failure generally appears at transitional inflection point of the first movement direction after the first peak value acceleration and one direction cycle change of vibration track.(2) When rock slope vibration acceleration is up to 0.4g, the mountain massif commences with deformation-failure; when near to 0.8g, the mountain massif appears with large-area intensive deformation-failure. But the slope sliding is destabilized when critical acceleration near to 0.4g. Generally, greater vibration amplitude, more times of repeated vibration, longer vibration acceleration, longer duration time, more...