Displacement Analysis On Prop-structure For Diaphragm Wall Of Deep Foundation Pit

With the development of economy, economical and practical for traffic especially waterway transportation demand is higher and higher, the reconstruction of shiplocks. creating a lot of deep foundation pit engineering, the scale and depth increases ceaselessly. This kind of deep foundation pit engineering, if use existing design of foundation pit engineering theory (strength control design) and the conventional construction technology has been difficult to satisfy the requirements of foundation pit surrounding environment protection. Although in recent years. many scholars and engineering and technical personnel already in foundation pit engineering design of the deformation control aspects of many studies, But looking for excavation process related foundation pit bracing structure deformation and displacement and near formation around the relationship among building deformation regularity aspect still has many problems to solve. This topic Based on the ShiQiao third-line lock in yangzhou, putting the pit excavation engineering, supporting structure and foundation pit surrounding soils in a system to research. Using ABAQUS software. combined with large finite element ShiQiao third-line lock of deep foundation pit engineering. the whole process of excavation numerical simulation analysis. Analyzing soil excavation and the excavation unloading soil caused the bottom of foundation pit supporting uplift. outside the settlement of soil structure. supporting structure, the deformation and stress changes of deep foundation pit engineering support structure the excavation process horizontal displacement. stress variation, basal soil and reinforcement of surface subsidence uplifts is summarized. and obtain some deep foundation pit design and construction of the conclusions have practical significance. The following are main research results in this paper:1, Supporting structure (the deformation of underground continuous wall) to the obvious regularity, the excavation process, the wall to the top first move, with the foundation pit excavation pit, wall body bottom displacement is more and more big. the wall body is obvious to the foundation pit in central inside of the concave. The whole wall body for slope deformation can estimate of the deformation, stable to provide the reference.2. Level one and two in foundation pit excavation, wall body vertical maximum horizontal displacement occurred in wall body, and displacement of the top three or four growing rapidly, while the bottom slope excavation put wall horizontal displacement has larger development, top displacement has not changed much. After the excavation, the maximum horizontal displacement occurred in wall bottom, minimum horizontal displacement occurred in1-2under excavated plane2m range.3. the stress changes, supporting structure with the excavation and maximum stress value increases ceaselessly, in foundation pit excavation is after3. Because of foundation pit slope excavation face three level4put far from supporting structure excavated plane (tertiary12m from wall), so in recent three level4excavation little impact on wall body stress change.4. Underground continuous wall to wall or clipping and the soil of the maximum horizontal displacement occurred in the soil where soil than other earlier into plastic zone, because pit soil caused soil hole to rebound, thus in the pit mobile soil wall bottom stress concentration.5. Excavation unloading, soil caused pits, its uplift soil uplift in foundation pit is larger, the amount in central support structure of soil near uplifts is small. Outside the settlement of soil pit excavation in the distance a range, the biggest settlement occurs in land even after wall to wall.6. Comparing the different thickness of wall in the same soil, same excavation depth, excavation deformation. Diaphragm wall displacement, stress, etc. obtained the thickness of the wall deformation influence law.