软岩填筑高速铁路路基的适用性探讨

Applicability Exploration on the Filling Subgrade of High Speed Railway with Soft Rock

研究目的:元古界以及新生代软岩在我国广泛分布,随着软岩地区高速铁路的大量修建,软岩填筑高速铁路路基适用性问题倍受关注。本文在武广高速铁路相关研究与应用的基础上,深入探讨软质岩填料高速铁路路基的适用性,意在降低造价、保护环境,提高经济与社会效益。研究结论:(1)软岩块石的成份和性质复杂,且可变性大,用于高速铁路路基填料前,应从其强度、水理性、可破碎性、崩解性、矿物组成、破碎后的颗粒组成以及外力作用下的颗粒变化等多方面,进行适用性评价;(2)易破碎、不易软化、不含蒙脱石等不良矿物的软岩,可以用作高速铁路路基填料;(3)风化不均匀的软岩,不能直接用作高铁路基填筑,其改良后高铁路基的适用性,应根据其破碎性、崩解性、矿物组成以及颗粒分析等进行评价,全风化软岩应根据其矿物组成、颗粒组成等,参照现有的土类填料评价其适应性;(4)本文提出的软岩填筑高速铁路路基适用性评判方法、标准等,对软岩地区修建高速铁路具有一定的指导意义。

Research purposes： Proterozoic and Cenozoic soft rocks are widely distributed in our country. With a large number of high - speed railway being bult at the soft rock area, it is a main issue on the adaptability of using soft rock as filling materials for subgrade of high speed railway. The adaptability of filling the subgrade of high speed railway with soft rock was systematically studied based on the related application achievement in Wuhan -Guangzhou High Speed Railway, in order to reduce the cost, protect the environment and improve the economic and social benefits. Research conclusions： （ 1 ） Because the complicated material composition and characteristic, systematically experiment should be done in order to evaluate the adaptability of using soft rock as filling materials for subgrade of high speed railway. The experiment research aspect involve strength, water rational, broken resistance, disintegration, mineral composition, particle analysis and particle variations undei external force of the soft rock. （2） The type of soft rock can be used as the filling materials for high speed railway subgrade, which can be easily broken, different to soften, not excluding harmful materials like montmorillonite. （3）The non -uniform weathering soft rock cant be used as the filling materials directly. The adaptability of non - uniform weathering soft rock after improved, was dependent on the broken resistance, disintegration, mineral composition and particle analysis of it. The adaptability of the completely weathered soft rock can refer to the soil filling classification standard distinguished by the mineral and particle composition. （4） The group classification standard of the soft rock stone and the evaluation method of filling the subgrade of highspeed railway in this paper with soft rock have an important significance of the high - speed railway in soft rock region.