铁路隧道基底病害产生机理及整治措施

运用理论分析及模型试验和现场试验的方法,对铁路隧道基底结构的受力状态、病害产生的机理以及病害的整治措施进行研究。研究表明:隧道基底结构在列车静载作用下处于受弯拉的受力状态,在列车运行荷载作用下则会产生挠曲振动,其基底结构会随之产生疲劳破损直至断裂;隧道基底病害的产生和发展是列车动载、地下水、施工质量等多种因素综合作用的结果,各因素之间又有着相互促进,相互恶化的关系。对隧道基底病害的整治要采用改善隧道基底的结构形式和排水设计、减弱列车振动对基底结构及基岩的影响以及保证施工质量等多种措施和手段进行综合治理。

Study on Mechanism and Treatment Measures of Foundation Base Disease in Railway Tunnel

By using the methods of theoretic analysis, model experiment and spot test, the mechanical condition of tunnel bed, the mechanism of tunnel bed disease and the treatment measures are studied. The study results show that the tunnel bed is on bend state under static train load, and it will vibrate under dynamic train load, the tunnel bed structure will fatigue and rupture under the dynamic load. The results also show that the (occurrence) and development of rail tunnel bed disease are caused by the combination action of multi-factors, these include the dynamic train load, underground water and the construction quality of tunnel bed and so on, they promote each other and the traveling condition in tunnel are worsen. Then the synthetical treatment (measures) of tunnel bed disease are put forward, that is to improve the material and the drainage design of tunnel bed, decrease the influence on tunnel bed and floor rock by dynamic train load, assure the construction quality etc.