Abstract: The development of marine energy is gradually moving towards the deep sea. Large offshore platforms at deepwater areas put forward a higher requirement for the bearing capacity to the mooring structures. Aiming at the problem of insufficient bearing ratio of traditional torpedo anchors, we developed a novel deepwater grouting torpedo anchor. The anchor drives the grouting pipe into the seabed, and then grouts into the seabed; the grout squeezes the soil and forms a grouting consolidation block around the anchor; thereby, the pullout resistance of the anchor will be greatly improved. The model tests were carried out using the self-designed marine anchor grouting and pulling test system, and the effects of different grouting quantities on the grout diffusion characteristics and the bearing characteristics of the anchor were studied. The results show that the grout can better wrap the anchor, grout block is inverted cone and bond closely with the anchor, and they can bear the upper load together. The maximum bearing ratio of grout block can reach 24.6, much higher than 2.4-4.1 of traditional torpedo anchors, thus verifying the feasibility of deepwater grouting torpedo anchor. With the increase of grouting quantity, the cross-sectional area and overall height of grout block are increased, and the overall bearing capacity of the grouting torpedo anchor also is enhanced.

Key words: marine mooring structure, deepwater grouting torpedo anchor, torpedo anchor, bearing characteristics, model test