高速铁路风积土地基沉降预测与变形控制

High speed railway aeolian soil foundation settlement and deformation prediction control

针对高速铁路地基加固时有关区域类型土的问题,以高速铁路风积土地基为研究对象,通过现场监测以及数值模拟分析高速铁路风积土地基的沉降规律,表现为等桩长加固地基沉降成"中心大两边小"的形式分布于变形关键区,由现场监测数据通过拟合得出高速铁路风积土地基的沉降预测模型,通过对施工过程的动态数值模拟分析说明等桩长地基加固桩和土之间存在相对变形,针对这一问题提出了"力大强加固、力小弱加固"的均化变形平衡原理,依据沉降等值线在地基压缩层内的分布,采用变桩长加固控制措施,以地面中心点为原点确定变桩长的"半椭圆"布置形式,通过将变桩长地基加固模拟计算结果与试验路段允许沉降差对比分析,说明变桩长加固技术的优越性.

High speed railway subgrade reinforcement research is improving, but the study of regional soil is relatively lacking. This paper took the high speed railway in aeolian soil foundation as the research object. Through field monitoring and numerical simulation of the settlement of high speed railway aeolian soil foundation, the length of the pile reinforcement of foundation settlement into ＂high at center and small on both sides＂ distributed in the key area of deformation, and the settlement prediction model is composed of field monitoring data obtained by fitting the high-speed railway of aeolian land base. Through the numerical simulation of dynamic construction process of the＇ existence of relative deformation between pile and soil reinforcement analyses length of pile foundation, and then put forward the deformation balance principle of ＂strong reinforcement with large force, week reinforcement small force ＂. Based on the settlement contour in foundation compression distribution within the layer, this study put forward the control measures of reinforcement using long variable pile to the ground, and the center point as the origin gives the length of pile in ＂semi elliptical＂ layout, will become strengthened by simulation results and experimental sections allows the differential settlement of foundation pile length to perform contrast analysis, which illustrates the superior long reinforcement technology of variable pile.