软弱围岩隧道台阶法施工中拱脚稳定性及其控制技术

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Abstract Taking a railway tunnel as background，combining with numerical analysis method and in-situ tests， the deformation characteristics of arch springing and destabilization mode of surrounding rocks during construction of the tunnel by bench cut method were analyzed. In addition，corresponding control measures for arch springing stability were discussed. The following results are achieved. (1) During the construction of tunnel，the settlement and horizontal convergence of arch springing are notable. Therefore，the control of arch springing deformation is one of the key measures to prevent the occurrence of large deformation of weak surrounding rocks. (2) The high yield degree of surrounding rocks at arch springing is one of the prime reasons for large deformation of arch springing. During the construction of tunnel by the bench cut method，damage forms of bedrock at foundations change from local destabilization of arch springing to integral shear failure with the increase of bench height. (3) Based on the control effects of arch springing deformation，the section of tunnel with the surrounding rock of class IV can be excavated by long bench cut method，the section with the surrounding rock of class V should be excavated by short bench cut method，and for the section with the surrounding rock of class VI，the micro-bench cut method is recommended. (4) For tunnels with weak surrounding rocks，proper bench height increment is beneficial to the stability of surrounding rocks under the condition that the working face stability is ensured. (5) The techniques of widening arch springing and setting temporary inverted arch are of obvious effects for controlling the deformation of arch springing. But the technique of widening arch springing is suitable for projects where arch settlement is remarkable，and the temporary inverted arch technique is more applicable to the sections with remarkable horizontal convergences.

Key words： tunneling engineering railway tunnel weak surrounding rocks stability of arch springing control techniques numerical analysis in-situ test

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	Articles by authors
	LI Wenjiang1
	2
	SUN Minglei1
	ZHU Yongquan1
	ZHU Zhengguo1
	LI Yuliang3

Cite this article:

LI Wenjiang1,2,SUN Minglei1, et al. ARCH SPRINGING STABILITY AND ITS CONTROL techniques DURING CONSTRUCTION of tunnels with weak surrounding rocks BY BENCH CUT METHOD[J]. , 2012, 31(S1): 2729-2737.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2729

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