摘要
铁路轨道及铁路路基稳定性问题是火车通道工程中的重要问题,在火车轨道下面进行下穿通道施工,若是在施工期间不进行有效的保护,会严重破坏既有铁路的整体运营。因此极有必要在施工期间对既有路基影响分析。研究发现:(1)在轨道下穿施工期间,由于铁路轨道及铁路路基本身的稳定性以及火车不间断运行,施工影响不仅仅是单一性质,在振动荷载的影响下产生交叉影响;(2)由于施工的影响,破坏了原有的地层稳定性,同时在火车运行的影响下,进一步加深了施工范围内的地层应力变化,同时影响到了地表土层的变形,破坏了路基的原始状态,引起沉降及其变形;(3)通过数据实测进行拟合,因施工引起的沉降变化规律与高斯曲线相似,通过在施工中针对不同的施工状况采取不同的控制措施,可以有效的控制沉降,保证施工安全。
Railway track and railway subgrade are important equipment in railway passage engineering. Underpass construction under railway track will seriously damage the integrated operation of existing railways if it is not effectively protected during construction. Therefore, it is necessary to analyze the influence of existing roadbed during construction. It is found that :(1) during the construction of track underpass, because of the stability of railway track and its basic body and the uninterrupted operation of trains, the construction impact is not only a single nature, but also a cross-effect under the influence of vibration load;(2) because of the influence of construction, the original stratum stability is destroyed, and the construction is further deepened under the influence of train operation, the change of stratum stress within the scope affects the deformation of the surface soil layer, destroys the original state of the roadbed, and causes settlement and deformation;(3) by fitting the measured data, the settlement change law caused by construction is similar to Gauss curve, by adopting different control measures according to different construction conditions in construction, settlement can be effectively controlled and construction safety can be guaranteed.
出处
《建筑技术开发》
2019年第6期85-87,共3页
Building Technology Development
基金
国家重点研发计划项目(2018YFC0808700)
关键词
铁路路基
轨道下穿通道
地表变形
破坏模式
railway subgrade
track underpass
surface deformation
failure mode
