Sensitivity Analysis Of Highway Slope Seismic Stability

Since the20thcentury, with the rapid growth of the national economy, traffic serviceshave got a rapid development in China, and in the process of expressway construction,massive slopes will be encountered，however, the safety of these slopes is easily affected byexternal environment. China is an earthquake-prone country, and the collapse, instabilityoccurs frequently when the slopes are under earthquake force, moreover, the randomness andunpredictability of earthquakes, which makes the research on the stability of slop muchcomplicated. In order to reduce the influence of earthquake action to the slope stability, thisthesis is based on the Shanxi part of Shiyan-Tianshui expressway, aiming at the sensitivityfactors in the seismic stability analysis of highway slope, the sensitivity parameter analysissystem was established and the influence on the change of various factors to the slope stabilityis discussed. The main work includes the following aspects:(1) The relevant data and materials of seismic stability in highway slopes are researchedand retrieved systematically, and the influence of geological structure, rock mass structuretypes, formation lithology, landform, hydrology geological condition, seismic load and otherfactors to the seismic stability of slopes are analyzed.(2) Based on the research and retrieval, the method of sliding instability mechanism andseismic stability analysis are studied, meanwhile, in order to calculate and analyze the seismicstability of slopes, the calculation method of the minimum safety factor and the correspondingsoftware are introduced.(3) Based on the calculation method of the minimum safety factor and the correspondingsoftware, the sensitivity parameters analysis system is established. The sensitivity parametersanalysis of different forms of slopes (linear, steep slow platform on the steps, slow on steepplatform stairs) is analyzed by the system. It is concluded that the change rules betweenhighway slope safety parameters and other factors can be got under the influence ofearthquake.(4) Based on the Shaanxi part of Shiyan-Tianshui expressway and the seismic safetyevaluation of the project, and combined with the geological exploration, the sampling test ofgeotechnical parameter, a typical slope is chosen to analyze the sensitivity parameters andverify the accuracy of the sensitivity analysis method in this thesis.