昌赣客运专线CFG桩复合地基沉降控制

以昌赣(南昌—赣州)客运专线试验段CFG桩复合地基为例,建立了三维动力响应分析模型,分析列车运行速度、桩长等多个影响复合地基沉降的因素,得出各因素对其沉降的影响程度和规律,确定控制沉降的关键因素.研究结果表明:在列车移动荷载作用下,路基沉降主要集中在路基表层,且路基各结构层沉降沿深度方向和线路横向有明显的衰减;增大桩身长度、垫层厚度或桩身弹性模量,均可减小复合地基各结构层的沉降.

Settlement Control of Composite Foundation with CFG Piles on Nanchang-Ganzhou Passenger Dedicated Railway

Based on the CFG pile composite foundation of the Nanchang-Ganzhou Passenger Dedicated Railway test section,a three-dimensional dynamic response analysis model was established,the factors that affect the settlement of the composite foundation such as the train running speed and pile length were analyzed.The degree and law of the influence of various factors on the settlement were obtained,and the key factors to control settlement were determined.The research results show that the subgrade settlement is mainly concentrated on the surface of the subgrade,and the settlement of each structural layer of the subgrade has obvious attenuation along the depth direction and the lateral direction of the line,under the action of train moving load.Increasing the length of pile body,cushion thickness or elastic modulus of pile body can reduce the settlement of each structural layer of composite foundation.