岩溶地基高速铁路路基关键技术分析

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Abstract Research purposes: Karst foundation is widely distributed in China, and high-speed railway has strict requirements on the stability and deformation of subgrade. The construction of high-speed railway subgrade engineering on karst foundation must simultaneously solve the two key technical problems of foundation collapse and settlement deformation control, which requires high-precision exploration of karst foundation, targeted reinforcement measures, and effective reinforcement construction and quality inspection methods.
Research conclusions: (1) Complex karst areas are faced with problems such as the concealment, heterogeneity and diversity of karst development. Conventional exploration technologies should be combined with new exploration technologies such as high-resolution remote sensing, Beidou satellite and unmanned aerial vehicle to improve the efficiency and accuracy of karst foundation exploration. (2) The karst foundation of high-speed railway can be reinforced by grouting, composite foundation, reinforced concrete pile foundation structure and their combination measures in combination with the stratum type and karst evaluation zone. The design of reinforced concrete pile foundation structure should consider the location and shape change of karst caves and the dissolution change process of karst fracture zone. The structure of CFG pile composite foundation should consider the impact of shoot tip of karst bedrock surface. (3) Karst grouting should adopt the dynamic construction process of "combination of exploration and grouting, and implementation in sequence". The quality of grouting reinforcement construction can be compared and analyzed before and after grouting by using electrical sounding, Rayleigh wave method and electromagnetic wave CT detection at the same section, and judged by water pressure test. (4) This research can provide useful reference for the construction of high-speed railway in karst areas.

Key words： karst foundation high-speed railway subgrade engineering key technologies

Received: 23 April 2023

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TU213

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	Articles by authors
	YAO Yuchun
	LI Anhong
	ZHOU Bo
	XIAO Chaoqian
	CHU Yuguang

Cite this article:

YAO Yuchun,LI Anhong,ZHOU Bo, et al. Analysis on Key Technologies of High-speed Railway Subgrade in Karst Foundation[J]. Journal of Railway Engineering Society, 2023, 40(8): 35-39.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I8/35

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