Numerical Simulation of Deformation and Failure Mechanism of Main Inclined Shaft in Yuxi Coal Mine, China

Disturbance stresses can cause deformation and damage to a tunnel’s rock, potentially threatening the mine’s safety. This paper investigates the effects of disturbance damage on the main inclined shaft due to the excavation of an electromechanical chamber in a deep inclined shaft at Yuxi Mine. Specifically, a numerical model was constructed using Midas GTX NX and Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) to match the actual engineering conditions, and to reveal the stresses and deformations in the surrounding rock of the main inclined shaft before and after the excavation of the main inclined shaft, the electromechanical chamber and the head chamber. The results revealed that the surrounding rock stress around the main inclined shaft is significantly influenced by excavation disturbance. The bottom bulge occurred due to the unstable vertical and shear stresses in the bottom coal bed moving into free space. After the excavation of the electromechanical chamber, the maximum displacement of the floor can be increased from 0.35468 m to 0.64301 m, nearly doubled, and a large area of surrounding rock deformation occurs in the inclined shaft falling roadway. Affected by excavation disturbance, the maximum deformation of floor can reach 1.06 m, with a wide fluctuation range. The main area of damage to the surrounding rock was identified, except for the main inclined shaft, which occurred near the intersection of the inclined shaft and the drop level location. This area is mainly affected by superimposed tensile stress damage, prone to large area floor heave and spalling. The research content is expected to provide certain theoretical support in taking measures to deal with the deformation and failure of the surrounding rock in a main inclined shaft.

[1]  Chuang Sun,et al.  Investigation of Deep Shaft-Surrounding Rock Support Technology Based on a Post-Peak Strain-Softening Model of Rock Mass , 2021, Applied Sciences.

[2]  Yuanyuan Pu,et al.  Risk assessment of dynamic disasters in deep coal mines based on multi-source, multi-parameter indexes, and engineering application , 2021, Process Safety and Environmental Protection.

[3]  Zhou Jifang,et al.  Long-term mechanical and acoustic emission characteristics of creep in deeply buried jinping marble considering excavation disturbance , 2021 .

[4]  F. Ma,et al.  Case Study of Roadway Deformation Failure Mechanisms: Field Investigation and Numerical Simulation , 2021 .

[5]  H. Jing,et al.  Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam , 2020 .

[6]  Chun Wang,et al.  Study on Rib Sloughage Prevention Based on Geological Structure Exploration and Deep Borehole Grouting in Front Abutment Zones , 2020 .

[7]  Wenbin Guo,et al.  Study on the Failure Mechanism for Coal Roadway Stability in Jointed Rock Mass Due to the Excavation Unloading Effect , 2020, Energies.

[8]  Feng Gao,et al.  Theoretical and technological exploration of deep in situ fluidized coal mining , 2019, Frontiers in Energy.

[9]  Dongsheng Zhang,et al.  Study on Surrounding Rock-Bearing Structure and Associated Control Mechanism of Deep Soft Rock Roadway Under Dynamic Pressure , 2019, Sustainability.

[10]  Zhaoyang Song,et al.  Effect of combined mining with steeply dipping seam on stability of surrounding rock of inclined shaft in weakly cemented stratum , 2019, IOP Conference Series: Earth and Environmental Science.

[11]  A. Wu,et al.  Study on repair control technology of soft surrounding rock roadway and its application , 2018, Engineering Failure Analysis.

[12]  Xiaojie Yang,et al.  Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata , 2018 .

[13]  P. Kulatilake,et al.  Effect of rock mass and discontinuity mechanical properties and delayed rock supporting on tunnel stability in an underground mine , 2018 .

[14]  L. Tian,et al.  Mechanical and crack evolution characteristics of coal–rock under different fracture-hole conditions: a numerical study based on particle flow code , 2018, Environmental Earth Sciences.

[15]  H. Jing,et al.  A case study on large deformation failure mechanism of deep soft rock roadway in Xin'An coal mine, China , 2017 .

[16]  L. Srivastava,et al.  Empirical estimation of strength of jointed rocks traversed by rock bolts based on experimental observation , 2015 .

[17]  Hongwen Jing,et al.  Numerical simulation of a jointed rock block mechanical behavior adjacent to an underground excavation and comparison with physical model test results , 2015 .

[18]  Maruti Kumar Mudunuru,et al.  On enforcing maximum principles and achieving element-wise species balance for advection-diffusion-reaction equations under the finite element method , 2015, J. Comput. Phys..

[19]  Dongsheng Zhang,et al.  Simulation of water resource loss in short-distance coal seams disturbed by repeated mining , 2015, Environmental Earth Sciences.

[20]  Yuanping Cheng,et al.  Gas outburst disasters and the mining technology of key protective seam in coal seam group in the Huainan coalfield , 2013, Natural Hazards.

[21]  Daigoro Hayashi,et al.  Finite element modeling of stress distributions and problems for multi-slice longwall mining in Bangladesh, with special reference to the Barapukuria coal mine , 2009 .

[22]  Doug Stead,et al.  Evaluation of coal longwall caving characteristics using an innovative UDEC Trigon approach , 2014 .

[23]  Hua Cheng,et al.  The experimental study on inner shift lining structure of freezing shaft in deep thick aquiferous soft rock , 2012 .

[24]  Lin Jian,et al.  Numerical simulation of zonal distrigation of surrounding rock mass in deep mine roadways , 2010 .

[25]  Xie Pan-shi,et al.  Numerical Simulation and Determination of Bolt Parameters of Roadways , 2006 .

[26]  He Man,et al.  Research on the non-linear mechanics characters of large section cavern excavating within soft rock by numerical simulation , 2002 .

[27]  Stability analysis for compressed air energy storage cavern with initial excavation damage zone in an abandoned mining tunnel , 2022, Journal of Energy Storage.