Pull-out model test of anti-floating multi-bell-shaped anchor under cyclic loading
In order to study the reasons for the deterioration of the anchor performance caused by groundwater variation,a series of physical model tests were employed to explore the anchorage enhancement of the expanded anchor in the anti-floating process.Firstly,a single pull-out test was carried out through the indoor model test,and the change of bearing capacity of multi-bell-shaped expanded anchor under different buried depths during the pull-out process was obtained.Secondly,according to the ultimate uplift bearing capacity obtained from the single pull-out test,the cyclic test was carried out to explore the evolution mechanism of the bearing performance of the multi-bell-shaped expanded anchor under different cyclic amplitudes,cyclic times and cyclic frequencies.Finally,the image particle velocity method(PIV)was used to analyze the deformation mechanism of the surrounding soil,and the variation characteristics of the surrounding soil displacement under single pulling-out and cyclic loading were obtained.The test results show that the axial load-displacement curve of the bell-shaped expansion anchor can be roughly divided into three stages:elasticity,vibration and failure.With the increase of buried depth,the ultimate bearing capacity and soil displacement of the anchor increase.Under the action of cyclic loadings,the increase of the cyclic load ratio,the number of cycles and the cycle frequency will weaken the bearing capacity of the anchors.
万方数据
维普
