In-situ Test Study on Pressured Anchor through Soft Soil in Coastal Foundation Pit

Thick marine marshy soft clay are widely distributed in the north shore of Qingdao Jiaozhou Bay. To study the applicability of pressured anchor through the thick soft soil, in-situ comparative tests about pressure-dispersive anchor, tensioned anchor and capsule type pressured expanding anchor were carried out. The test results show that the ultimate bearing capacity of pressure-dispersive anchor and capsule type pressured expanding anchor is less than acceptance standard value. Relative to the ultimate bonding strength and the local bearing capacity, the overall instability of anchorage body caused by the bending of anchor during hole formation may be the main reason for the insufficient ultimate bearing capacity of pressured anchor through soft soil. It is suggested that tensioned anchor should be used first for the prestressed anchor crossing soft soil in coastal foundation pit engineering.