Analysis Of Simulation To The Process Of Deviation Rectification By Drawing Out Soil Method To Masonry Pagoda

Deviation rectification by drawing out soil method is a dynamic process, it must control the tower body’s stress and displacement. Through reducing the side of small settlement pressure area on tower’s foundation, lead the tower has a rigid body rotation according to established program, this process involves construction technology, soil physical and mechanical properties, the foundation and upper structure interaction, the structural safety of tower body and other aspects.In this paper, it will combine with a masonry pagoda project, carried out numerical simulation analysis of mechanism to the key factors, it include the depth, diameter, distance of the hole, main work is as follows:(1) Based on the measured frequency through pulsating method and use inversion method to obtain the model parameters, numerical model was established. The hole depth decided the effective area of the weaken layer, when these hole has the same depth, it was disadvantage to control the rectification rate, the soil between the hole easily to exceed the ultimate bearing capacity, make the settlement deformation too fast. Proposals to control the same depth to back inclination critical plane, then continue to dig several holes which has a great influence to deviation, make the rectification gentle. The hole depth should be slightly more than the projection of tower gravity center.(2) When the diameter of the hole was small, the rectification process tends to be stable, displacement and stress changes smoothly, has a good controllability. Conversely, larger diameter makes correcting process tends to uncontrollable. Therefore, the hole diameter has the key effect to control the rectification rate. (3) When the hole distance was large enough, the soil between two adjacent holes tend to be no interaction. The change of hole distance could influence weaken foundation, the distance also has a great influence to effective section. The plastic zone between adjacent holes has a large effect on rectification. In order to guarantee the back inclination rate controllable, the parameter of diameter and distance should be comprehensive consider and design.(4) Heap load assist can effectively improve rectification, and favorable to the tower stability and stress. The load should be split to multi-stages and loading slowly. strictly prevent the stress of most soil exceed the ultimate bearing capacity at the same time, lead to deformation too fast. The contact between ring beam and tower bottom will appear large extrusion stress at non correction side, which even has a risk of crush. The cross section between ring beam and tower will occur lager share stress, negative to the safety of tower.