Inversion Analysis of Rock Mass Mechanical Parameters and Stability Analysis of Emergency Rescue Section in Adit 5# of Xianglushan Tunnel

HAN Gang; HUANG Shu-ling; DING Xiu-li; MA Xu-qiang; ZHANG Yu-ting; HE Jun

doi:10.11988/ckyyb.20221069

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (12) : 56-61. DOI: 10.11988/ckyyb.20221069

STABILITY ANALYSIS OF WEAK SURROUNDING ROCK MASSES

Inversion Analysis of Rock Mass Mechanical Parameters and Stability Analysis of Emergency Rescue Section in Adit 5# of Xianglushan Tunnel

HAN Gang, HUANG Shu-ling, DING Xiu-li, MA Xu-qiang, ZHANG Yu-ting, HE Jun

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Abstract

The 5# adit of Xianglushan tunnel under construction of Central Yunnan Water Diversion Project features complex geological conditions as it crosses active fault zones. Severe water-mud bursting disasters and prominent stability problems of surrounding rock hinder the construction progress and project safety. According to field monitoring and geophysical exploration data, we determined the mechanical parameters of surrounding rock at emergency rescue section by using inversion analysis based on neural network and genetic algorithm; on this basis, we simulated the whole process of construction, excavation, and support, and analysed the surrounding rock stability. Results manifested that the surrounding rock mass of emergency rescue tunnel section of adit 5# was in an overall stable state. Except that the deformation of surrounding rock on the right side of the tunnel section K0+501-513 was relatively large, the deformation of other parts was less than 15 cm in general; the depth of plastic zones was within the range of 2-5 m; and the stress of support structures was at a normal level. The research findings would guide the safe and rapid construction of subsequent tunnel sections of 5# adit or tunnels with similar geological conditions.

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inversion of rock mass parameters / neural network / genetic algorithm / stability analysis / Xianglushan Tunnel

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HAN Gang, HUANG Shu-ling, DING Xiu-li, MA Xu-qiang, ZHANG Yu-ting, HE Jun. Inversion Analysis of Rock Mass Mechanical Parameters and Stability Analysis of Emergency Rescue Section in Adit 5# of Xianglushan Tunnel[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(12): 56-61 https://doi.org/10.11988/ckyyb.20221069

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