Abstract:From the perspective of observation environment, through the regression analysis of meteorological factors, we find that although there is a linear effect between temperature change, pressure change and strain change, the fitting results are quite different from the actual observed strain change when the strain pressure drops. There is a strong correlation between the start time of the decline and the time when the Meishan reservoir starts to discharge and the time when the water level of the downstream Shihe river rises sharply. The numerical simulation results of the three-dimensional irregular load model show that the early rapid decline of the anomalous strain compressibility of the cave body has little correlation with the load change of the Meishan reservoir in the same period, and has a large correlation with the water level change of the Shihe river. The tectonic stress field in the study area did not change significantly before and after the occurrence of cave-strain and compressive anomaly. Therefore, we preliminarily infer that the abnormal drop of strain and pressure in Jinzhai station cave may be caused by the environmental load changes in the surrounding sites.
LIU Li,ZHENG Haigang,LI Junhui et al. Comprehensive Study on Compressive Anomaly of Cave-Strain Based on Observation Environment[J]. jgg, 2023, 43(9): 980-985.