安全监测, 土压力计, 测值异常, 监控指标阈值, 智能监控

The measurements of earth pressure cells are influenced by many factors including gauge structure and materials, manufacturing craftsmanship, installation, environmental impacts, uneven and varying loads, data processing, etc. Currently their accuracy and reliability is still controversial in domestic engineering circle. In a large-scale water diversion project, there are more than 3 500 earth pressure cells mainly installed to observe the load of earth on concrete structures either from the bottom, flank or top. As of the end of 2023, some of them had registered negative values, and some had exhibited unusual large annual variation in measurements or even out of the range of the gauges. In this paper, the causes of abnormal values by earth pressure cells are discussed. As well, the typical patterns of normal and abnormal values by all the earth pressure cells are systematically summarized, based on reviewing the measurements by all the earth pressure cells. Suggestions on the application of earth pressure cells and the setting of thresholds of safety monitoring indexes are put forward, which can be referred by similar projects.

safety monitoring, earth pressure cell, abnormal measurement, threshold of monitoring index, intelligent monitoring