浅埋隧道围岩压力的统一表达模型及计算方法

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Abstract Research purposes: Based on the limit equilibrium principle of wedge body, the horizontal pressure ratio coefficient η and generalized lateral pressure coefficient λ were introduced for getting a unified model and calculation method of shallow buried tunnel during the process of surrounding rock pressure calculation. The model aims to replace the calculation methods of surrounding rock pressure under three different working conditions of ultra-shallow buried, shallow buried ( non-biased ) and shallow buried bias in the Code for Design of Railway ( Highway ) Tunnel using a regular mathematical expression form. The uniformity of the calculation form, the uniformity of the physical essence and the consistency of the calculation steps of the surrounding rock pressure formula of shallow tunnel can be realized, and the theoretical defects of the pressure calculation formula in the industry specification, such as different expression, obscure physical connotation and complicated operation, can be overcome.
Research conclusions: (1) The unified model achieves the unification of the calculation formula of surrounding rock pressure under ultra-shallow buried, shallow buried (non-biased) and shallow buried bias in theory, and the mathematical form is simple. (2) It can be extended to the calculation of tunnel surrounding rock pressure in the form of multi-layer soil, non-horizontal ground with surcharge, irregular sliding wedge, small clear distance and multiple-arch form. (3) The results of unified model are completely consistent with those of Code for Design of Railway (Highway) Tunnel. (4) The unified model and calculation method are of great significance to the revision and supplement of industry specifications.

Key words： shallow buried tunnel surrounding rock pressure unified model

Received: 18 May 2022

PACS:

U451.5

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	XU Chong
	WANG Qian

Cite this article:

XU Chong,WANG Qian. A Unified Model and Calculation Method of Surrounding Rock Pressure for Shallow Buried Tunnel[J]. Journal of Railway Engineering Society, 2022, 39(8): 46-52.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I8/46

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