沪宁城际客运专线搅拌桩复合地基沉降超限整治措施研究

在沪宁城际客运专线K300+199~+284段，为有效地控制地基沉降，在地基处理时，采用了搅拌桩加垫层等形式的结构；但由于复杂的地层及水文条件导致个别地段地基沉降超限，影响客运专线运行速度与安全。对此，分析了沪宁城际K300+199~+284无砟轨道地段的搅拌桩加垫层复合地基沉降超限的原因，并采取了有针对性的整治措施，能够保证轨道结构变形不超限。

Study on Treatment Measuresfor Excessive Settlement of Mixing Piles Composite Foundation on Huning Intercity Passenger Dedicated Line

In the K300 ＋ 199 ～ ＋ 284 Section of Huning Intercity Passenger Dedicated Line, the structure which combines mixing piles with bed course was adopted during the foundation treatment in order to control the foundation settlement; however, as a result of the excessive settlement of several sections caused by complex strata and hydrological conditions, the running speed and safety was still affected. Thus, the reasons why such composite foundation combining mixing piles with bed course in the K300 ＋ 199 ～ ＋ 284 ballastless track section of Huning Intercity PDL had excessive settlement were analyzed, in relation to which the treatment measures were adopted and was captable of ensuring the track structure deformation not to overange.