Research on evolution characteristics of multi-information and stability of goaf under deep tunnel

Feiyue Sun; Jiaqi Guo; Xiaobing Zhang; Shaohua Li; Xiliang Liu

doi:10.56748/ejse.24499

Authors

Feiyue Sun Henan Polytechnic University
Jiaqi Guo Henan Polytechnic University
Xiaobing Zhang Henan Polytechnic University
Shaohua Li China Railway 15th Bureau Group Co., Ltd.
Xiliang Liu Henan Polytechnic University

DOI:

https://doi.org/10.56748/ejse.24499

Keywords:

Deep tunnel, goaf, Safety Distance, Stability Evaluation, Numerical Simulation

Abstract

In order to ensure the safety of construction and operation of the tunnel near the goaf. Based on dynamic numerical analysis, three-dimensional finite difference numerical simulation software was developed by FISH programming. Then, on basis of the construction of practical engineering, the safety distance and energy evolution mechanism in an underlying mining goaf area of deep tunnel are studied. The results show that according to the different safe distance in an underlying mining goaf area of deep tunnel, the tunnel structure is divided into danger zone, influence zone and safe zone. The relationship between the cumulative horizontal energy and stress ratio can be divided into three stages: acceleration, average stability and deceleration. The energy evolution of the three stages can also better reflect the damage and failure mechanism inside the surrounding rock mass. The measured field curve shows that when the safety distance is 12 m, the goaf has limited influence on the stability of the tunnel, and the construction in an underlying mining goaf area of deep tunnel is stable on the whole and meets the safety requirements. The best safe distance between the tunnel and goaf is about one time of the tunnel span.

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