复杂地质条件重力锚岩体力学试验及工程应用

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Abstract Research purposes: The mechanical parameters of the rock and soil mass of the gravity anchor foundation are an important basis for the analysis (or review) of stability against sliding. In this paper, seven geologically representative foundations were selected and in-situ mechanical tests were carried out on the bottom of the gravity anchor foundation at the Jinsha River Bridge in the Tiger Leaping Gorge of Shangrila-Lijiang Expressway, to obtain mechanical parameters such as bearing capacity and friction coefficient of the base.
Research conclusions: (1) The characteristic value of bearing capacity of crushed stone soil is 119 kPa and the base friction coefficient is 0.44, the characteristic value of bearing capacity of the strongly weathered phyllite is 508 kPa and the base friction coefficient is 0.35, the base friction coefficient of the cleavage dense zone in the excavation area is 0.45, which does not meet the design requirements. (2) The characteristic value of bearing capacity of the cleavage dense zone on the right side of the anchorage foundation is 719 kPa and the friction coefficient of the base is 0.95, the characteristic value of bearing capacity of the cleavage dense zone in the excavation area of the left anchor rake angle of the anchorage foundation is 720 kPa, the characteristic value of moderate weathered sandy slate bearing capacity is 1.44 MPa and the base friction coefficient is 1.22, the characteristic value of medium weathered sandy slate with phyllite is 1.44 MPa and the base friction coefficient is 0.65, and the characteristic value of strong weathered sandy slate with phyllite 719 kPa, which all meet the design requirements. (3) For the foundations of the crushed soil with the stone mass and the strongly weathered sandy slate with phyllite that does not meet the design requirements, the measures such as excavation and replacement of concrete, consolidation grouting, are used for reinforcement, and then the anti-slip stability factors of gravity anchors are reviewed. (4) The research results can provide reference for the safe and stable operation of gravity anchorage under complex geological conditions.

Key words： gravity anchorage characteristic value of bearing capacity base friction coefficient construction measure

Received: 28 April 2021

PACS:

TU459

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	Articles by authors
	GUO Xifeng
	YU Meiwan
	WANG Xinze

Cite this article:

GUO Xifeng,YU Meiwan,WANG Xinze. Rockmass Mechanical Tests and Its Engineering Application about Complicated Geological Conditions Gravity Anchorage Basement[J]. Journal of Railway Engineering Society, 2022, 39(11): 57-62.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I11/57

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