Landslide soil parameters optimization based on one-by-one correction method
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Abstract:
Landslide soil strength parameters are the key parameters in the landslide evaluation and management engineering design. Currently a common value-selection method is profile inversion. The result of single profile inversion is multiple combinations of parameters. The inversion of two or more profiles would present a mathematically overdetermined problem with no unique solution. Based on the optimization theory and method, when the equation set of multi-profile inversion parameters had an overdetermined problem, this paper transformed the inverse problem into a direct problem, constructed an objective function, indirectly inversed the parameters using the one-by-one correction method, and obtained the optimal values of the parameters. Thus, it obtained the strength parameters that reflected the characteristics of sliding soil and were suitable for each profile. In this paper, with Huangjiaoshu landslide as an example, we combined the results of indoor experiments and inversion analysis to determine the range of parameters values, and used one-by-one correction method to optimize parameters values. The optimized parameters were c=9.76kpa, φ=6.81°, and they tallied with the deformation state when verified with each profile. This paper can provide reference for landslide soil parameters values selection in landslide prevention engineering. But the method does not apply to all cases; it is only feasible when a set of comprehensive parameters are needed.
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