Yang Z., Gao Q., Zhou R., Su K., Wan Y., Zhang W., 2015, Study on Field Tests of Capsule-type Underreamed Anchor, Chemical Engineering Transactions, 46, 1021-1026.
Capsule-type underreamed anchor is a new type of anchor that can change the spatial morphology and geometrical size of the underreamed anchor by adjusting the size of the prefabricated bag and therefore meeting the engineering requirement on bearing capacity. A destructive pull-out experiment based on the engineering demands was carried out for this type of underreamed anchor, which was then compared with the conventional anchor. The results showed that the underreamed anchor overcame the problems of low compressive strength and small size of grouting body in the anchoring segment by the function of high- pressure grouting and reaming through bag expansion. This feature is important for the construction works in soft soil which is usually difficult to achieve with the conventional anchor. The uplift bearing capacity of the underreamed anchor was increased significantly by adjusting the size of the prefabricated bag. The data from field test provided an important framework for the study of the load-carrying mechanism and damage mode of capsule-type underreamed anchor and also for the popularization of the anchor in engineering.
