高速铁路无砟轨道软土地基沉降区深部转移的不平顺控制理论及应用

Theory and Application of Irregularity Control by Shifting the Settlement Part to a Deeper Position for the Soft Soil Foundation of High-speed Railway Ballastless Track

提出将软土地基沉降区向深部转移以控制轨道不平顺的思想,结合产生沉降的某高速铁路路基地质条件建立地基沉降传递模型,阐释了沉降区转移到深部以后,利用沉降变形向上传递过程中波长增加、幅值随之衰减以控制轨道不平顺的基本原理;研究刚性桩加固地基中下卧层沉降变形对轨道不平顺及刚性桩加固区稳定性的影响规律,验证基本原理的可用性和刚性桩加固技术实现沉降区深部转移的可行性;应用沉降区转移控制轨道不平顺理论分析判断现场地基沉降区位置,与实测结果一致,验证了本文理论的实用性。

This paper put forward the concept of shifting the settlement part of the soft soil foundation to a deeper position to control the track irregularity.A subgrade settlement transfer model was built based on the actual foundation geological conditions of a high speed line where settlement problem occurred.Then an analysis was made on the basic principle of realizing track irregularity control by taking advantage of wavelength increase and amplitude decrease during the upward transfer process of settlement deformation when the settlement part was shifted to a deeper position.The effects of the underlying layer deformation of the rigid pile reinforced foundation on track irregularity and the stability of rigid pile reinforced parts were studied.The adaptability of the basic principle and the feasibility of using rigid pile reinforcing technology to achieve the settlement part transferring to a deeper position were verified.The onsite foundation settlement part position calculated with the track irregularity control theory by using settlement part shifting is consistent with the measured results,which demonstrates the application value of such theory.