The Application of Microtremor Exploration Technology in Thick Loess Area of Lanzhou

Abstract

For the large thickness loess area in Lanzhou, engineering application research on excavated off-set loess using microtremor exploration technology. In this paper, by detecting the surface wave velocity structure of a single point, comparing the dispersion curve data of a single point with the borehole data, and comparing the surface wave velocity profile data with the engineering geological profile, the judgment basis of soil-rock interface and strong-medium interface is put forward. The stratigraphic structure of the loess area with large thickness is accurately divided; By analysing the relationship between the surface wave value of the borehole and the physical and mechanical indexes of the soil, the relationship curves of surface wave-porosity ratio, surface wave-density and surface wave-collapsibility coefficient are studied, and the fitting curves of each curve are obtained and the correlation is summarized. Through the research of this paper, it has certain guiding significance for the application of microtremor exploration in large thickness loess area.