基于谷仓效应的砂卵石隧道围岩荷载计算研究

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Abstract Research purposes: The sandy cobble surrounding rock particle system has uneven gradation distribution and point-to-point contact between particles, which is easy to cause loose surrounding rock, instability collapse and other outstanding problems in tunnel construction process. According to the typical granular material characteristics of sandy cobble surrounding rock, based on the principle of granary effect, this paper uses the discrete element theory of granular material to explore the calculation method of surrounding rock load of sandy cobble tunnel. The meso-mechanical behavior of sandy cobble soil under different meso-structures is analyzed, and the influence of sandy cobble particle gradation on soil pressure is explored to reveal the influence law of tunnel span on tunnel surrounding rock load.
Research conclusions:(1) A modified Janssen formula for calculating vertical pressure of sandy cobble soil is proposed, and the steering ratio of important coefficient in the formula is determined. (2) The influence law of sandy cobble particle gradation on vertical pressure and lateral pressure of soil is revealed, and the calculation formulas of bottom pressure and lateral pressure of sandy cobble soil are obtained. (3) Through the simulation experiment of different span tunnel model, the vertical load correction coefficient is proposed. The load calculation value of sandy cobble surrounding rock by using the correction coefficient method is similar to the simulation calculation results, which verifies the accuracy of the formula calculation. (4) The load calculation method of sandy cobble surrounding rock based on Janssen model is established, which can provide theoretical basis for fine design of tunnel in sandy cobble stratum.

Key words： surrounding rock of tunnel barn effect sand pebbles load calculation

Received: 21 April 2022

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U455

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	Articles by authors
	WANG Mingsheng
	LU Junfu
	LI Minhao
	DENG Yonggang

Cite this article:

WANG Mingsheng,LU Junfu,LI Minhao, et al. Research on the Calculation of Tunnel Surrounding Rock Load in Sandy Cobble Soil Based on Barn Effect[J]. Journal of Railway Engineering Society, 2023, 40(1): 62-67.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I1/62

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