堆载对邻近高铁桩基变形影响的数值分析研究

Numerical Analysis of the Influence of Surcharge Loads on the Adjacent High-Speed Railway Pile Deformation

摘要: 软土地基上的堆载会使邻近高铁桩基产生侧向和竖向位移，不同的堆载形式会直接影响桩基的位移规律和大小。基于绍兴万绣路车辆基地施工堆载对邻近杭甬客专影响的工程案例，采用数值模拟的方法，研究堆载作用下高铁桩基变形规律，并探究堆载高度、堆载距离、堆载集中度、堆载刚度、堆载位置等参数对于高铁桩基变形的影响。计算结果表明，高铁桩基以侧向位移为主，且桩基侧向位移随堆载高度增加、堆载距离减小、堆载集中度增大而增加，而堆载刚度的影响和堆载荷载大小有关。此外，当堆载位置变化时，处于堆载边缘的桩基会产生更大的侧向变形，需要对其提供重点关注和保护。研究结果可为软土地区施工堆载的设计与优化提供技术支持。

Abstract: Surcharge loads will cause lateral and vertical displacement of adjacent high-speed railway pile in soft ground. Different types of surcharge loads will directly affect the displacement model and the size of pile. Based on the engineering case of the impact of the construction load on the ad-jacent Hangyong railway in Wanxiulu vehicle base in Shaoxing, the paper studies the defor-mation model of the high-speed railway pile under the surcharge loads by numerical simulation method, then studies the influence of loads height, loads distance, loads concentration, loads stiffness and loads position. The results show that the displacement of high-speed railway pile is mainly the lateral displacement, which will increase with the increase of loads height, the de-crease of loads distance and the increase of loads concentration, and the influence of loads stiffness is related to the magnitude of loads. In addition, when the location of loads changes, the pile at the edge of the loads will produce larger lateral deformation, which needs to be focused on and protected. The research results can provide technical support for the design and optimi-zation of construction loads in soft soil area.