LONG-TERM SETTLEMENT PREDICTION ANALYSIS OF OVERHEAD TRANSMISSION TOWER ON RECENT FILL

Prediction about settlement of concrete foundation for transmission line tower is an important basis for designing transmission line. Settlement monitoring of foundation is a common method to detect the inclination of transmission tower. The calculation method of foundation settlement commonly used in engineering is layer-wise summation method, and there are many curve fitting formulas for predicting future settlement based on the existing monitoring settlement. The practical creep settlement algorithm is one with few parameters and clear physical significance. In the paper, the layer-wise summation method, creep settlement practical algorithm, the three-point method and hyperbolic method were used to calculate and predicte the foundation settlement of the overhead transmission tower on the bauxite backfill site in Yangquan, Shanxi. The results showed that the practical creep settlement algorithm had good applicability. In order to solve the problem of credible prediction interval of curve fitting formula, the effective prediction interval principle was given by the practical creep settlement algorithm. At last, the effective prediction time of concrete foundation with given error limit was predicted.