Research On Influence Of The Anchor Pile On The Bearing Capacity Of The Testing Pile In The Static Load Test Of Friction Pile In Loess

The high-rise buildings are usually pile-dwellings. In recent years, as a great number of high-rise buildings have been constructed, the design and test of piles have been greatly developed. The static load test of pile is one of safety and reliable ways to test pile foundation. However, the soil-pile system is complicated and soils vary significantly from place to place. As far the theory and program of design and test of piles are not enough perfect to meet the practical requirements.With more and more high-rise constructions have been builded, the static load test of pile is adopted as the foremost way to identify vertical ultimate bearing capacity of single pile. But the influence of the anchor pile on the bearing capacity of the testing pile has been hardly studied in the static load test of pile. The research for this influence is significant of great importance.According to some data of static load tests of pile in Sian region, load-transfer function of the upper and lower segment of soil surrounding the pile are defined as the bilinear soft model and hard model respectively. Moreover, under the static load on the friction pile, a small portion of friction resistance is derived from end-bearing capacity. So the end-bearing capacity is ignored in the thesis. The research on the influence of the anchor pile's surrounding stress field on the friction testing pile's surrounding stress field in the static load test is put forward in the analysis of force mechanism in loess.Based on the generalized transmission method of load is established, to a certain extent the influence of the anchor pile's surrounding stress field on the testing pile's surrounding stress field is studied in the static load test in Sian region. The generalized transmission method of load is compiled in Frotran to trace out simulated actual curve and modificatory curve, in order to modify the ultimate bearing capacity of the testing pile.Through the research on the influence of the anchor pile's surrounding stress field on the friction testing pile's surrounding stress field in the static load test, modificatory value is confirmed under the different space between piles and different diameter in Sian region.