Deformation Of Deep Excavations Examples And Analysis

With the development of China's urbanization, land is increasingly tense, the increasing scale of excavation.and the location close to busy traffic, traffic volume, surrounding the complex pipeline. Excavations of security or not, related to the surrounding buildings, road usage, come in pit structural safety accidents,and a widening need attention. At present, domestic and international object on moving load on the main research direction of roads, tunnels, bridges, but the structure for the foundation pit under the action of moving loads Study on little response.In the first place,in this paper, through a large number of literature to read, Author sum up the quo of the development and research of the excavation project, the research background, research object and research status under the dynamic response of excavations on moving loads.Secondly,introduced some basic theories and methods of the research structural dynamic response of foundation pit under the moving load, which Included the deformation of the main soil characteristics, yield criteria and constitutive models, the approximation form of moving load, such as point, line, surface load and the basic theory of numerical calculation and tools.Using dynamic analysis to establish the level dynamic equation of supporting piles,to study its mechanical behavior. To a deep excavation, for example, by FLAC3D numerical simulation, combined with the actual monitoring data to prove the feasibility of numerical calculation, and then into the dynamic calculation.One more time, according to the characteristics and practical issues of the moving load,would simulated the moving load with the use of a half-wave load.The research of the question is simplified as problem of partial three-dimensional space, using Mohr-Coulomb Elastic-Plastic Model, Beam element simulates bored pile, anchor is applied with anchor element,the road is used shell element.Simulation of excavation part is an empty element model (null).By calculation and analysis of different boundary model, determines the dynamic response of the analysis of this computing the range of model.the finite difference method to analyze the structure of foundation pit under the action of moving load dynamic response.Finally, by numerical model calculation and analysis, summarized excavations response to the law under the action of moving loads.