采动区简支梁桥变形计算与数值模拟研究

发布时间：2018-03-11 19:07

本文选题：开采沉陷　切入点：地表移动变形　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：桥梁建筑物广泛分布于全国各大矿区。煤炭开采引起的地表大面积移动变形对矿区沉陷范围内公路、铁路桥梁产生了极大影响。地表移动变形达到甚至超出桥梁最大允许变形时,必将引起桥梁倾斜破坏,严重影响道路交通安全运行。本文以山西阳泉西环高速路采煤区内保安村段简支梁高速路桥为研究对象,通过理论研究分析了采空区上部地表移变形动对简支梁桥结构稳定性影响的主要因素,并借助数值模拟软件模拟研究了桥墩随地表移动变形之间关系。在此基础上,依据项目实际数据预计计算了不同开采布局状况下简支梁桥随地表变形破坏情况。通过以上研究得到:(1)通过理论分析可知采空区内简支梁桥主要受桥墩间不均匀下沉倾斜和水平移动影响;采动区内桥墩主要受地表倾斜影响,桥墩倾斜值小于地表倾斜。(2)模拟求解了简支梁桥移动变形与地表变形之间关系。(3)根据计算不同开采工作面布设情况下简支梁桥变形可知:桥梁位于采空区下沉拐点位置且与所在边界垂直时桥梁倾斜变形最大;随着桥梁走向与所对应采空区边界夹角减小,桥梁倾斜变形逐渐减小;在地表水平移动极值位置处,桥梁桥面与桩基发生较大相对水平滑动,影响桥梁安全。基于以上研究结果在指导矿区合理规划开采方案,合理有效加固桥梁保证道路交通安全运行有重要意义。
[Abstract]:The bridge buildings are widely distributed in the major mining areas of the country. The large area movement and deformation of the surface caused by the coal mining cause the highway within the subsidence area of the mining area. Railway bridges have a great impact. When the surface movement deformation reaches or exceeds the maximum allowable deformation of the bridge, the bridge will be inclined to destroy. This paper takes the simple supported beam highway bridge of Baoan village section in the mining area of Xihuan expressway in Yangquan, Shanxi Province as the research object. In this paper, the main factors that influence the stability of simply supported beam bridges caused by the surface movement and deformation of the upper surface in goaf are analyzed theoretically, and the relationship between the piers' displacement and deformation with the help of numerical simulation software is studied. According to the actual data of the project, the deformation and failure of simply supported beam bridge with the ground surface under different mining layout conditions are calculated. Through the above study, we can get 1: 1) through the theoretical analysis, we can know that the simple supported beam bridge in goaf is mainly affected by the non-uniformity between the piers. The effects of subsidence, tilt and horizontal movement; The pier in mining area is mainly affected by the surface inclination. The relationship between the moving deformation of simply supported beam bridge and the surface deformation is solved by simulation. 3) according to the calculation of the deformation of simply supported beam bridge under different mining working face arrangement, it is known that the bridge is located in the gob area of subsidence. When the point position is perpendicular to the boundary, the slope deformation of the bridge is the largest. With the decrease of the angle between the bridge strike and the corresponding goaf boundary, the inclined deformation of the bridge gradually decreases, and at the extreme position of horizontal movement of the surface, the bridge deck and the pile foundation slide relatively horizontally. Based on the above research results, it is of great significance to guide the rational planning and mining scheme of mining areas and to strengthen bridges reasonably and effectively to ensure the safe operation of road traffic.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325;U448.21

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