基于变位规律的悬索桥锚碇隧道围岩损伤度安全阈值研究

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Abstract Based on the blasting excavation in tunnel-type anchorage of Aizhai suspension bridge，the characteristic curves of displacement and rock damage degree D of tunnel-type anchorage are obtained by numerical analysis according to the finite element models established under different damage degrees. The results show that the anchorage slides along the direction of cable tensile forces and uplifts vertically under cable tensile forces. There are two inflection points in the curve of displacement and rock damage degree when D = 0.1 and 0.4. When D = 0.2，the curve is a typical mono-peak one. Displacement field of surrounding rock nearby the anchorage has uniform distribution；and the efficiency of sharing and transferring cable forces by anchorage tunnel surrounding rock is higher. When D≥0.3，the curve of displacement and rock damage degree transforms into a typical double peak curve. Displacement field of the anchorages exhibits a mutual independence to a certain extent，and the displacement contours of the anchorages are separated with each other when the cable being overloaded. When D≥0.6，anchorage displacement increases greatly and its field separates completely. Based on the above conclusions，D = 0.2 and 0.6 can be considered as the safety threshold of damage degree of surrounding rock Dcr and critical value of anchorage failure Dur，respectively.

Key words： rock mechanics displacement law tunnel-type anchorage damage degree safety threshold

Received: 01 June 2009

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	LI Gaohui1
	2
	WU Congshi2
	DENG Longbo1

Cite this article:

LI Gaohui1,2,WU Congshi2, et al. STUDY OF SAFETY THRESHOLD OF SURROUNDING ROCK DAMAGE DEGREE OF ANCHORAGE TUNNEL FOR SUSPENSION BRIDGE BASED ON DISPLACEMENT RULE[J]. , 2010, 29(S2): 3633-3640.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3633

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