软弱围岩隧道管棚预支护开挖土压分布模型试验

doi:10.13722/j.cnki.jrme.2015.0901

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Abstract 36 sets of orthogonal model tests on the ultimate bearing capacity of the pre-support system of tunnels with pipe roof in soft surrounding rock were carried out. The pre-supporting system with pipe roof was found to effectively prevent the collapse when cross-cover ratio H/D = 1. The 120° arrangement of pipe shed advanced support reduced 59.5%(H/D = 2) and 64.8%(H/D = 3) of the maximum surface settlement. The 150° arranged pipe roof reduced 63.2%(H/D = 2) and 76.8%(H/D = 3) surface maximum settlement. The recommended range of width parameter K of Peck formula was given by fitting the experimental data. K increased with the density of pipe roof，and increased about 0.13 in 120° pipe arrangement，about 0.19 in 150° pipe arrangement. The limit bearing capacity of supported surrounding rocks was approximately doubled in the ultimate load tests，and the destruction form was changed from the dome collapse into the sidewall squeezing in the process of the tunneling and loading.

Key words： tunnelling engineering weak surrounding pre-supporting system with pipe roof model test supporting force Peck parameter

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	Articles by authors
	GUO Xuan1
	ZHANG Hongru1
	MENG Jiao1
	ZHANG Xiaoxin2
	WANG Mengshu1
	ZHU Ying1

Cite this article:

GUO Xuan1,ZHANG Hongru1,MENG Jiao1, et al. Model test to earth pressure distribution on pipe roof of tunnels#br# as pre-supporting system in weak surrounding rock[J]. , 2016, 35(6): 1214-1224.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0901 OR http://www.rockmech.org/EN/Y2016/V35/I6/1214

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