Stress Histories of Partially Grouted Anchors in Slope Under Surface Load

Abstract:

Through model tests, an analysis was made of the stress characteristics of partially grouted anchors in soil slope under surface load with a focus on the stress characteristics of each row anchor and its changes with the load time under the loads, the stress histories of anchor with surface load’s increase, as well as time of anchors’ maximum and stable stress states under different loads. Comparison was done about stress differences between partially grouted anchor and fully grouted anchor. Results show that the strain of top partially grouted is the largest and that of bottom anchors is the lowest under ground loads; the strain of top and middle partially grouted anchors is larger than the bottom anchors’ under lower loads, but the strain of bottom fully grouted anchor is the largest and that of top fully grouted anchor is the lowest; under larger loads, the strain of top grouted anchors are the largest and that of bottom anchors is the lowest, which is similar to the fully grouted anchors; under the same load, the strain of partially grouted anchor increases under a sustained load, and then decreases; with the increase of loads, the peak strain increases to the maximum at first, and then decreases gradually, but increases at last. So, when a structure of anchors is designed to support a man made soil slope, all level loads should be considered in order to make the slope safe.