隧道初期支护与围岩相互作用的时空演化特性

doi:10.13722/j.cnki.jrme.2017.0117

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Abstract

The principle of dynamic interaction between surrounding rock and support is the core issue of tunnel support design. Based on the elastoplastic softening model and non-associated flow rule， the elastic-plastic analysis of deep buried circular tunnel is carried out. Then taking into account the aging characteristic of shotcrete and the process of tunnel construction，the coupling model of the interaction of primary support and surrounding rock is established. The dynamic interaction between surrounding rock and support of an analytical section at different places from the face is then obtained during tunnel excavation. Through a specific case study，the supporting effects of steel rib and lattice girder under different supporting opportunities are compared，and the effects of shotcrete hardening characteristic on the stability of surrounding rock control and the supporting structure safety are analyzed，thus the following conclusions are obtained. Lattice girder is more flexible than steel rib，which is favour of the release of surrounding rock stress and displacement，but less able to control surrounding rock deformation and more sensitive to the change of support opportunity. The development of shotcrete supporting force can be divided into four stages including slow growth，rapid growth，growth slowdown and stability，of which the distribution ratio for each stage varies with the supporting time. During the early stage of the supporting structure，the load on shotcrete can be greater than its current limit bearing capacity and leads to its failure. The selection of supporting opportunity should take the steel arch types，shotcrete hardening characteristic and tunnel advancing rate into consideration to achieve the ideal support effect under the premise of supporting safety. Dynamic interaction between primary support and surrounding rock can be forecast and the application of convergence confinement method in tunnel support design can be more accurate by the research results，thus provides a theoretical basis for the support design during tunnel construction process.

Key words： tunnel engineering strain softening stress relief concrete hardening dynamic interaction of support and surrounding rock reasonable supporting opportunity

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	Articles by authors
	SUN Zhenyu
	ZHANG Dingli
	FANG Qian
	TAI Qimin
	YU Fucai

Cite this article:

SUN Zhenyu,ZHANG Dingli,FANG Qian, et al. Spatial and temporal evolution characteristics of interaction between primary support and tunnel surrounding rock[J]. , 2017, 36(S2): 3943-3956.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0117 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3943

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