铜永高速公路压煤采动路段桥梁工程整改措施研究

发布时间：2018-05-29 23:26

本文选题：高速公路 + 桥梁工程　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着社会建设与经济发展,越来越多高速公路需要穿过采空区。当存在诸多原因,高速公路设计路线不能避让采空区时,只能在采空区上方穿过。煤层采动后,会引起地表的移动变形,会对高速公路结构物产生一定的影响,威胁结构安全,影响高速公路运营。根据采空区的开采情况,可将采空区分为准采空区、新采空区和老采空区。其中,准采空区是指已经设计规划尚未开采的采区,新采空区是指正在开采或停采时间少于一年的采空区,而老采空区是指已停止开采且停采时间超过一年的采空区。不同采空区由于开采时间不同,所引起的地表移动变形程度也不同。老采空区由于停采一段时间,地表移动变形不活跃,趋于平稳;而准采空区是由于未来采动所形成,地表移动变形尚未发生,未来一旦发生将十分活跃。无论是针对于哪种采空区,都要考虑地表移动变形对结构物的影响。对于未建结构,需要充分考虑压煤采动对地表移动变形影响来进行初步设计和施工图设计;而对于已建或者新建结构,则需要考虑治理采空区或整改结构物来使结构物适应压煤采动所引起的地表移动变形。论文中所依托的工程铜梁到永川高速公路就是既有高速公路穿过准采空区,需要对既有桥梁工程进行整改,使其适应地表移动变形,保证结构安全。论文的主要研究内容如下:①基于现场调研和勘察资料,介绍铜梁到永川高速公路工程的地理位置、地形地貌、水文气象、地质构造、压煤概况与施工现状;②详细论述地表移动变形对桥梁的影响,分析下沉、倾斜、曲率、水平移动和水平变形对高速公路的影响,并判断哪些指标影响显著。介绍地表移动变形的预计方法——概率积分法,及其指标控制的选取和参数的选取,并计算每个桥梁所预计的地表移动变形结果;③采用概率积分法所预计的地表移动变形值,运用Midas有限元分析软件,计算既有桥梁上部结构受力在采动影响下能否满足规范要求,并计算桥梁下部结构和附属结构能否适应地表移动变形,来分析原设计桥梁对未来采动所引起地表移动变形的适应能力;④根据原桥梁适应地表移动变形能力的分析结果,针对简支梁、连续箱梁和先简支后结构连续T梁提出合理的整改方案,使其适应地表移动变形,并细化施工过程与施工工艺;⑤提出桥梁采动位移变形监测控制方案,对受采动影响桥梁进行监控,确保运营安全;同时,提出各个部门协作机制,加强部门间的协作。
[Abstract]:With social construction and economic development, more and more highways need to pass through goaf. When there are many reasons, the highway design route can not avoid goaf, can only pass above the goaf. After the coal seam is mined, it will cause the surface movement and deformation, will have certain influence on the expressway structure, threaten the structure safety and affect the expressway operation. According to the mining conditions of goaf, goaf can be divided into quasi goaf, new goaf and old goaf. The quasi goaf refers to the goaf which has been designed and planned, the new goaf is the goaf where the mining time is less than one year, and the old goaf is the goaf that has stopped mining and stopped mining for more than one year. Because of different mining time, the surface movement and deformation caused by different goaf are different. Because the old goaf has stopped mining for a period of time, the surface movement deformation is not active and tends to be stable, while the quasi goaf is formed because of the future mining movement, and the surface movement deformation has not occurred yet, once it occurs in the future, it will be very active. No matter which kind of goaf, the influence of surface movement and deformation on structure should be considered. For the unbuilt structure, it is necessary to fully consider the influence of coal mining on the surface movement and deformation to carry out preliminary design and construction drawing design, while for the constructed or newly built structure, Therefore, it is necessary to treat the goaf or to modify the structure to adapt to the surface movement deformation caused by coal mining. The project from Tongliang to Yongchuan Expressway in this paper is to pass through the quasi goaf of the existing expressway. It is necessary to rectify the existing bridge engineering to adapt to the surface movement and deformation and to ensure the safety of the structure. The main contents of this paper are as follows: 1. Based on the field investigation and survey data, this paper introduces the location, topography, hydrometeorology, geological structure, coal compaction and construction status of Tongliang to Yongchuan expressway project. (2) the influence of ground movement and deformation on the bridge is discussed in detail, and the influence of subsidence, inclination, curvature, horizontal movement and horizontal deformation on the expressway is analyzed, and which indexes are judged significantly. This paper introduces the prediction method of surface movement and deformation-probabilistic integral method, the selection of index control and parameter selection, and calculates the predicted surface movement deformation result of each bridge by using probabilistic integral method. The finite element analysis software Midas is used to calculate whether the superstructure of the existing bridge can meet the requirements of the code under the influence of mining, and whether the substructure and subsidiary structure of the bridge can adapt to the ground movement and deformation. To analyze the adaptability of the original designed bridge to the ground movement and deformation caused by the mining movement in the future. According to the analysis results of the original bridge adapting to the surface movement and deformation, the simply supported beam is aimed at. The continuous box girder and the continuous T beam with simple support and then structure are put forward a reasonable rectification scheme to adapt to the ground surface movement and deformation, and the monitoring and control scheme of bridge mining displacement deformation is put forward by refining the construction process and construction technology. Monitoring the bridges affected by mining to ensure the safety of operation, at the same time, put forward the coordination mechanism of various departments to strengthen the cooperation between departments.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445

【参考文献】