Research on the test and calibration method of microgravity detection of urban underground space

With the rapid development of national cities, the demand for urban underground space exploration and development and utilization has increased. Traditional and commonly used geophysical methods have too many interference factors in human activities areas to obtain true and accurate detection data. The microgravity method is relatively less affected by interference factors. The interference to urban buildings and human relics can be eliminated by the method of model forward correction, so as to obtain high-precision gravity collection data, and then the urban underground can be obtained through the inversion method. The spatial location information of tunnels, goafs, cavities, subsidence areas, and pipe corridors in the space. In this paper, through experimental detection and analysis of the theoretically affected factors in the urban detection by the ground mobile high-precision gravity measuring instrument, combined with the forward model correction research, the microgravity method has a good effect in the detection of urban underground space.