A Research On Bearing Behavior Of Jacked Pile In Soft Soil

The method of jacked-pile is distinguished by it's measuring of each pile. By manometer each pile can be measured the variable pressure and know the load of pile supporting in any depth as it be pressed into soil. But how to choose final pressure of pile according soil behavior? Whether the vertical capacity of single pile can be estimated according ultimate pressure? This problem deserves full attention in engineering, but up to present it still is a difficult research. The question is very complex, and concern to many subjects, although there are many engineers do the research in various way, it still has no satisfactory result.According to the information of jacked-pile in Su-Nan soft soil, the varied regularity of single pile's capacity as it being pressed in soft soil is discussed. As a whole, a number of main work is made.1.The defects of some theory which be used to analyze the compacting effect of jacked-pile are pointed out. With the concept of cavity expansion, the soil behavior of jacked-pile be carefully analyzed, and the change of soil-stress and soil-strain is obtained. On the basis of it, different ways of calculating the pile resistance and the principle of finally length as well as ultimate pressure is proposed.2.According to experiential formula of the ultimate bearing capacity of jacked-pile in different region. A relationship between piling pressed force and pile bearing capacity is obtained. Then the ultimate bearing capacity of jacked-pile increasing with time is taken account for, and the theoretical answer of it is obtained.3.By use of the measuring data of jacked-pile in WuXi BaoXin iron- infinite Company and WuXi LuoShe dirty-water disposal Factory and according the result of the jacked-piles'static-load test, a method be used to calculate piling resistance in soft soil is obtained. Then the relationship between finally pressure and bearing capacity of single jacked-pile is proposed. Some useful result be get by comparing theoretical data to actual data.4.Based on the soil-condition of jacked-pile, ANSYS,3D FEM software is adopted to analyze soil influence. The displacement penetration method is presented, which lets the pile move downward by means of the displacement boundary condition so that to simulate the piling process of jacked-pile. The method takes some complex problems into account, such as elasto-plasticity constitutive law, large deformation...