The Research On Curical Methods Of Bridge Engineering Upon Coal Mining:A Case Study Of Tong Yong Expressway

With the social construction and economic development, more and more through the mined-out area highway needs. When a number of reasons, can not escape route highway design mined-out area, you can only pass through the top of the mined-out area. After coal mining, can cause ground movement and deformation, and highway structures will have some impact, structural safety threat, affecting highway operations. In general, the pressure of coal mining influence on the highway in order to exploit the situation into goaf goaf and future Mined two. Goaf is one that has been depleted, ground movement and deformation has occurred, but not yet the end of the mined-out area above the structure will have some impact; the future of coal mining Mined means is carried out in the future, it is ground movement and deformation occur in the future, on the larger structure. Whether face goaf goaf or future, can not maintain the original design structures unchanged, appropriate changes will need to adapt their own ground movement and deformation. For non-built structures, the need for more change the original design; and for both structures, the need for rectification of existing structures to accommodate ground movement and deformation. Thesis project by relying on both tongliang to Yongchuan highway is coming through the mined-out area highways, required for rectification of existing structures, to adapt them to ground movement and deformation, to ensure the safety structure for similar highway through over the next goaf designed to provide a reference. The main contents are as follows:? Introduction to Yongchuan tongliang highway project location, topography, hydrology and meteorology, geological structure, coal pressure profiles and construction situation, to fully understand the engineering background, laying the groundwork for further research;? Detailed discussion of ground movement and deformation of the bridge, analysis sink, tilt, curvature, horizontal movement and horizontal deformation on the bridge and determine which indicators significantly affected. Introduction of ground movement and deformation prediction methods- probability integration method, and the index control and parameter selection, and calculate the projected surface of each bridge movement and deformation results;? Probability integral method using the projected ground movement and deformation values Midas using finite element analysis software to calculate the existing bridge superstructure under the influence of mining can meet the specification requirements. If satisfied, without rectification; if met, proposed reform program and then checking its ability to adapt to the ground displacement and deformation. At the same time, the calculation of bridge substructure and subsidiary structure can accommodate ground movement and deformation;? For simply supported beam, after continuous box girder and the first T beam continued structure reform proposals put forward reasonable and refine the construction process and construction technology;? Mining proposed bridge deformation monitoring displacement control scheme for mining affected by the bridge to monitor and ensure safe operation; at the same time, put forward various sectoral collaboration mechanisms to strengthen coordination between departments.