Methodological Study Of Critical Acceleration Analysis Of Slope Earthquake Stability

Slope stability owing to earthquake actions is a hard problem involving a seriesof different scientific fields, and is also a hot research point in engineering geologyand engineering seismology. So far, most evaluation works of slope earthquakestability are based on the comparison between dynamic stresses in slope mass causedby earthquake action and the anti-strength of the slope mass without consideration offailure probabilities of the slope. The purpose of this paper is to set up a suit ofevaluation methods for slope earthquake stability based on seismic parameters, andachieve the probabilistic assessment of earthquake failure modes of the slope. Thepaper takes the Liu Jia-quan loess slope in Baoji, Shaanxi Province, China as anexample, the main works and characters in this paper is concluded as follows:(1) According to the on-site micro-tremor test results, the characteristics ofmicro-dynamic responses of the slope is analyzed, as well as the relationship betweenspectrum structures of the micro-tremor, soil structures, covering layers thickness andelevation.(2) A new concept that based on fitting to micro-tremor spectrum is put forward,which can exert an effective constraint for numerical modeling and ambient vibrationsimulation, by this way, a reasonable physical mechanics model that matchinggeographic geological condition is set up. At the same time, Vibration-characteristicsunder different levels of frequencies are obtained.(3) The concept of dynamic overloading stability is put forward, which lay atheoretical foundation for the evaluation methods for slope earthquake stability thatbased on seismic parameters.(4) In consideration of the match of the constitutive relationship of the rock orsoil mass in a slope with actual earthquake action, an idea of searching for the criticalearthquake action of the slope at its present strength state by inputting the earthquakeaction from weak to strong is put forward, a new method considering fully dynamictime history method is formed.(5) In light of the concept of dynamic overloading method, break the traditional thinking of slope stability based on the comparison between inner stress and thestrength of the slope into a judgment of slope earthquake stability based on thecomparison between the critical earthquake peak acceleration and local fortificationearthquake peak acceleration, which have cconstructive values for the evaluation ofseismic stability of slopes and slope seismic hazard assessment.(6)The relationship between the self vibration characteristics of rock or soilmass in a slope and its critical failure state is researched, and the connection betweenthem is established. Thus, an analytical method in line with the slope seismic dynamicresponses of the physical processes and physical laws is initially established.