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高速铁路无砟轨道要求路基工后沉降不宜大于15mm,路桥或路隧处的沉降差异不应大于5 mm,工后沉降控制要求较高。对填筑期间沉降完成速度快、完成比例大的圆砾土、卵石土等低压缩性土,工后沉降分析时多以经验取值。以某客运专线DK151+200~DK151+767段路基为例,根据其不同地段的填高、基底地质条件及结构类型,结合工后沉降理论估算值,分别采取了挖除换填、CFG桩联合堆载预压等地基加固处理方案;通过分析现场沉降观测资料,介绍了圆砾土、卵石土等低压缩性土的沉降特性,验证了该地段地基加固处理方案的合理性,提出了该类土在填筑期间的沉降完成比例可达75%及考虑6个月预压期后其沉降完成比例可达95%等结论。
High-speed railway ballastless track requires subsidence post-construction settlement should not be greater than 15mm, road and bridge or road tunnel settlement difference should not exceed 5mm, post-construction settlement control requirements. Settlement during the completion of filling fast, to complete a large proportion of large gravel, pebble soil and other low-compression soil, post-construction settlement analysis to experience more value. Taking the embankment of DK151 + 200 ~ DK151 + 767 in a passenger dedicated railway line as an example, according to the filling of different sections, the geological conditions of the basement and the type of structure, combined with the post-construction settlement theory estimates, By analyzing the settlement data of the site, the settlement characteristics of low-compressive soil such as round gravel soil and pebble soil are introduced, and the rationality of the foundation consolidation treatment scheme is verified. Subsidence of the soil during the completion of filling up to 75% and 6 months after the pre-compression period to consider the completion of its settlement up to 95% of the proportion of conclusions.