路基是有生命力的结构物——我国高速铁路路基建设取得的成就和需要继续解决的问题

系统归纳总结我国高速铁路路基技术体系形成、发展、完善的历程和高速铁路路基建设10年来在地基处理、路基结构层设计和填筑、路堤式路堑、过渡段、路基边坡支挡防护和防排水、路基结构与附属电缆沟槽和接触网支柱等基础的系统集成、沉降变形观测与评估等方面变革和发展取得的成就,指出正是高速铁路对路基工程刚度和变形的严苛要求,促进了我国高速铁路路基技术的革命性变革和不断进步,强化了路基结构物的建造理念,凝聚了路基结构物的生命力;同时,在非饱和土、膨胀土(岩)等方面阐释路基建设过程中仍需继续研究解决的问题。希冀本文有助于我国高速铁路路基技术体系的不断完善、创新发展,进一步提升我国高速铁路路基建造水平,增强满足列车安全、高速、舒适运营的生命力。

The Subgrade is a Vital Structure—Achievements and Remaining Problems in Subgrade Construction of High Speed Railway

This paper summarizes the formation,development and improvement of subgrade technical system and addresses the achievements in the past decade in terms of foundation treatment; subgrade structural design and reclamation; embankment cut; transitional section; support and water proof for subgrade slope; integrated foundation of subgrade structure with auxiliary cable channel and catenary post pit; observation and evaluation of settlement deformation. It is the high speed railway,which sets high requirements for subgrade engineering rigidness and deformation control,that has resulted in innovation and improvement of subgrade technology,in reinforcement of subgrade structure engineering concepts and prolonged life cycle of subgrade structures. The remaining problems are explained in perspectives of nonsaturated soil and swelling soil encountered in subgrade engineering. It is hoped that this paper may serve to promote the improvement and development of subgrade technical system and the level of subgrade construction,and further vitalizes the operation of high speed trains in a safer,higher speed and more comfort manner.