Sensitivity Analysis Of The Physical Parameters To The Seismic Response Of Loess Slopes In Baoji Area

In recent years, loess areas are involving varying degrees of loess slope in construction process, which means study of earthquake dynamic stability problem has become an important subjects. The physical mechanical parameters and geometrical parameters is an important factor to impact the seismic response and stability. Due to the limitations of measurement techniques and inputs investigation lead to the value of physical parameters and geometric parameters is hard to obtain a certain value, thus the parameter value have some reasonable range of floating with inevitable. This article based on the variation of slope physical parameters and geometric parameters within a reasonable range, studying at the influence of parameters on the seismic response. The main content is to reveal the Baoji area loess slope seismic dynamic response to sensitivity of the law on properties and geometric parameters, and the description of the sensitivity of quantitative indicators. The article mainly include as the following.(1)Determine a reasonable range of value of soil physical mechanical parameters(Density, Internal friction angle, cohesion, Young’s modulus, Poisson’s ratio, damping ratio)in Baoji area according to the literature material, and determine a reasonable range of the slope soil physical mechanical parameters variation. Irrespective of The slope geometric parameters error be made by exploration accuracy.(2)The establishment of a typical slope model, it is using the Orthogonal method to design the experiment, combined with range analysis method to deal with the results, the range as quantitative indicator for the factor sensitivity. The slopes is excited by vertically incident P-wave Under the microseisms is to analyze the five factors including density, Young’s modulus, Poisson’s ratio, damping ratio, and degree of slope irregularities to study the effect of typical slope microseismic dynamics response. The maximum vibration velocity of slope as the evaluation index gets the order of each factor sensitivity(for descending): Bump degree> Poisson’s ratio> Young’s modulus> damping ratio> Density. Under the severe earthquake is to analyze the six factors including Young’s modulus, Poisson’s ratio, damping ratio, the degree of slope irregularities, cohesion, and internal friction angle to study the effect of typical severe earthquake dynamics response. The critical earthquake peak acceleration of slope as the evaluation index gets the order of each factor sensitivity(for descending): Internal friction angle> damping ratio> cohesion> Young’s modulus> Poisson’s ratio> degree irregularities.(3)Based on the orthogonal experiments, as an example for a loess slope at Panlongyuan in Baoji, Shaanxi Province, China, being a sensitivity of parameter analysis, combined with range analysis and variance to process the test data. For the microseismic, the range and F ratio as factor sensitivity quantitative indicators gets the order of each factor sensitivity(for descending): Poisson’s ratio> Young’s modulus> damping ratio> Density. For the severe earthquake, the result of each factor sensitivity(for descending) order is Internal friction angle> damping ratio> cohesion> Young’s modulus> density> Poisson’s ratio.