Experimental study on the pull out characteristics of anchorage body in loess and its theoretical approach

With backfill soil layers in the loess area as research object, this paper studies the bearing characteristics of the anchorage body in backfill soil by indoor model test and theoretical approach. The results indicated that the ultimate bearing capacity has a linear relationship with the confining pressure. Moreover, the higher the confining pressure, the larger the ultimate bearing capacity. The ultimate bearing capacity of the anchorage body increases slightly first and then decreases with the water content rising. It reaches the peak when the water content arrived at 13 %. The shear stress of the anchorage body is not evenly distributed along its length, and the stress is the highest near its end. It decreases gradually with the distance from the end of the anchorage body. A load transfer calculation model of the anchorage body is established, and the critical anchorage length and economical anchorage length are obtained. The research results can provide reference for the design and application of anchors in backfill soil in the loess area.