Abstract: Prestressed ground anchors have received wider applications in China recently. When the ground anchor is applied in the deep excavation with high pullout capacity requirements, high pressure jet grout can be applied in the bond zone of the anchor. However, due to underground feature of the grouting zone, it is difficult for the quality assurance and quality control during the construction. Further, the required load tests for the ground anchors are usually not conducted in the practice. As a result, the application of ground anchors for the deep excavation in Suzhou area is relatively rare. This paper presents a case history of a deep excavation support design for the General Children’s Hospital building. High pullout capacity prestressed ground anchor with high pressure jet grout method was used. Both the design and testing required by the code were strictly followed and the results were satisfactory.

Key words: prestressed ground anchor with high pressure grout, pullout capacity, required test for ground anchors, design and construction parameters