Application of microgravity measurements in urban underground space exploration

Abstract Urban underground space exploration is an important way to solve urban underground problems, Identifying the geological structure of urban underground space is of great significance for urban development. Gravity exploration is one of the most commonly used and effective geophysical exploration methods, using a high-precision gravimeter to collect small changes in the gravity field within the survey area and obtain underground spatial anomalies through data analysis. This paper introduces the gravity exploration method, elaborates on the principle of microgravity measurement, constructs a cavity anomaly model, and conducts simulations to provide theoretical support for carrying out gravity measurement. Finally, experimental tests of the cavity model were carried out at the test site to verify the feasibility of microgravity measurement in urban underground space detection.