The Application of Precise Trigonometric Leveling in Foundation Pit Monitoring

Geometric geoid method is the conventional method of foundation pit vertical displacement monitoring. This method is strongly influenced by the environment of foundation pit construction site. It is hard to measure in some narrow space foundation pit engineering. In this paper, the characteristics of three trigonometric leveling methods were summarized, and the source of measuring error and accuracy of total station precise trigonometric leveling was studied. Combining with engineering survey test, the measurement accuracy of TCA2003 total station precise trigonometric leveling was discussed. Then the feasibility and reliability of substituting precise trigonometric leveling for second-order leveling was analyzed. Finally, the process and condition of the application of total station precise trigonometric leveling were put forward.