Study On Bearing Capacity Characteristic Of Cyclic Loading Behavior And Group Anchor Effect For Inflatable Anchor Bolts In Sandy Soil

At present, China's coastal areas are in high-speed development period, in the construction of weak foundation areas and in the utilization process of marine resources, this new type of anchor rod has its special advantages, such as fast and effective reinforcement of soft ground region or the provision of anti-uplift forces and its recyclability. The domestic and foreign scholars have done a lot of research on the new type of anchor to get a lot of achievements. But for the application of a large number of inflatable anchor in practical engineering, there is still a lot of work, such as the study of cyclic loading, anchor group effect and bearing capacity mechanism etc..This article on the basis of previous studies, mainly embarks from the indoor model test of inflatable anchor, and has made exploratory researches on the bearing behavior and anchor group effect under the cyclic loading effect, and the main research is as follows:(1) The inflatable anchor model and the whole set of indoor model test device are designed and developed which can be used for single anchor and group anchor anti-uplift test through a large number of researches and analysis.(2) The anti-uplift force test of the inflatable anchor in two states of the aerated and non aerated in different buriment dept is carried out to obtain the conclusion that the inflatable expansion head part plays a major role for the anti-uplift force of the inflatable anchor and discuss the impact of inflation pressure on the bearing force and displacement of inflatable anchor, and the rule is concluded that the greater the inflation pressure is, the larger the ultimate anti-uplift bearing capacity and maximum displacement will be.(3) Based on the least square method, the regression analysis is carried out on the displacement-load curve of the obtained inflatable anchor, and the relationship is revealed between the displacement and the load basically of the exponential function.(4) Stage loading- unloading test and cyclic loading test of inflatable anchor are carried out to discuss its displacement and bearing capacity characteristics under cyclic loading.(5) The anti-uplift test of single inflatable anchor and group inflatable anchor is carried out. The analysis shows that anchor group effect coefficient becomes increased at first and then decreased with the increase of r the inflatable anchor spacing.(6) Through this paper, a large number of experimental data is obtained to analyze the bearing mechanism of inflatable anchor and the mechanism of anchor group effect.