Evaluation of Tie-Back Anchor Response

The various components of deformation associated with tie-back anchor loads are investigated and a method for determination of each of the significant components is developed. Elastic theory is used to develop graphs for determination of anchor movement in terms of dimensionless parameters related to load, anchor geometry and an equivalent soil modulus. In addition, an approximate procedure is developed for the possible minor contribution of the anchor extension. Due to uncertainties associated with soil modulus, determination of anchor movements on this basis may be inaccurate. The load test program which is common practice in the field construction sequence could be used to back-calculate a soil modulus which could then be used directly for prediction of response for other anchors in the same soil. This modulus may be used as an indicator of an appropriate modulus value to be used in conjunction with numerical analyses of the flexible wall system.