为了实现受采动影响铁路桥梁的安全运行，应用概率积分法预计了S2 S7工作面开采对三连铁路桥产生的最大移动与变形值。在此基础上分析了下沉、倾斜及水平变形对桥梁结构的影响。结果表明：桥梁下沉后铁路桥下过水断面净空高度满足规范要求；桥梁纵向倾斜不影响行车，可通过不断调整轨面来满足规范要求的桥梁横向倾斜且不影响墩台的稳定性；桥梁纵向压缩不会影响正常使用，但桥梁基础横向拉伸变形已达Ⅲ级。针对桥梁基础有可能遭受到较大损害的情况，提出了采用扁钢对桥墩及桥台进行加固的设计方案，并提出了保证线路正常运行的安全措施。实践表明，经过加固的铁路桥经受住了S2 S7工作面的采动影响，达到了铁路桥下安全采煤的目的。%In order to realize the safety service of the railway bridge influenced by mining,the probability integral method was used to predict the movement and deformation values of the Sanlian railway bridge at the S2 S7 working face during mining. Based on this,the effect of subsidence,inclination and horizontal deformation on structure of railway bridge was analyzed. The results showed that the wetted cross section height under the railway bridge is in accord with the requirement of criterion,the longitudinal inclination of the bridge beam did not influence the driving,and the horizontal inclination met the requirement of the criterion by adjusting the orbit plane,so it cannot influence the stability of the bridge pier. The longitudinal compression of the bridge did not affect the use, but the tensile deformation of the bridge lateral basis reached Class III, resulting that the bridge foundation may suffer the great damage. In view of this,the design which adopted the flat steel to strengthen the bridge pier and abutment was proposed,and the safety measures for the normal service of the bridge were put forward. The practice showed that the strengthened railway bridge can bear the mining influence of S2 S7 working face,to achieve the safety coal min-ing under railway bridge.
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