ANALYSIS, DESIGN AND CONSTRUCTION OF TIE-BACK ANCHOR FOR COFFER DAM

The concept of a rock anchor system is to create an internally stable mass of soil and also to stabilize the cofferdam that will resist external forces at an adequate level of serviceability. The analysis and design of rock anchor concentrates on achieving secure against a range of potential failure conditions of cofferdam. The design should limit movements of the soil and the cofferdam while providing a practical and economical basis for construction. The design should consider the mobilization of resistance by both anchors and cofferdam elements in response to loads applied to the cofferdam particularly sea water [3]. This paper deals with the analysis, design and installation of cement grouted rock/ground anchors and anchored systems. The analysis, design and construction procedure have been demonstrated through a series of numerical analyse sand a parametric study has also been carried out based on different anchorage capacity. It is concluded that 150 ton anchor capacity is effective in controlling horizontal displacement of cofferdam at different levels. Also this paper deals with the step by step analysis, design and construction procedure implemented at construction site.