遂渝线无砟轨道桩-网结构路基及其试验研究

研究目的：为实现无砟轨道铁路路基严格工后沉降的控制,遂渝线无砟轨道综合试验段首次采用了桩-网结构路基方案,其工作机理及其承载特性需要研究。研究方法：采用数值计算分析、离心模型试验、室内循环加载动态模型试验、现场实验等方法对无砟轨道桩-网结构路基承载特性、工作机理进行了系统的试验研究,基于试验研究研究成果,就桩-网结构路基定义、工作原理、设计技术进行了讨论。研究结果：基于试验研究研究成果,初步提出了桩-网结构路基定义、工作原理、设计技术。研究结论：桩-网结构路基具有竖向沉降变形小、变形稳定时间短的突出优点。桩-网结构可用于无砟轨道铁路深厚软弱地基加固、已建土质路堤的加固、无砟轨道道岔区等特殊地基加固。

Experimental Research on Pile-Mesh Structure Subgrade of Ballastless Track of Suining-Chongqing Railway

Research purposes:In order to realize the strict control of the post construction settlement of railway subgrade of ballastless track,the pile-mesh structure subgrade is adopted in the ballastless track integrated experimental section of Suining-Chongqing Railway for the first time,so it is necessary to do the research on mechanism and load bearing characteristic of pile-mesh structure.Research methods:The experimental researches are done on the load bearing characteristic and mechanism of the pile-mesh structure subgrade of ballastless track by adopting numerical calculation analysis,centrifuge model test,indoor cyclic loading dynamic model test and in-site test and etc.Based on the research results,the definition,working principle and design technology of the pile-net structure subgrade are discussed.Research results:The definition,working principle and design technology are presented according to the outcomes of test and research.Research conclusions:As the pile-mesh structure subgrade has the merits of less deformation due to "vertical settlement and less deformation-stable time,so the pile-mesh structure can be used for strengthening the deep,soft and weak subsoil of ballastless track railway,completed embankment and the special subsoil,such as in the turnout area of ballastless track.