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Instability mechanism and coupling support technology of full section strong convergence roadway with a depth of 1350 m

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  • NSTL
  • Elsevier
The nonlinear stability control of surrounding rock with large deformation is the key issue in realizing rapid excavation of deep soft rock roadway. Combined with various research methods, this paper deeply analyzes the characteristics of instability. Through the modified DruckerPraeger criterion, the mechanism of roadway instability under the coupling actions of multiple factors is studied, and the control strategy of deep soft rock roadway is given. On this basis, the combined support scheme is optimized and verified by simulation, test and field application. The results show that: (1) Long aging, strong rheology and full section are the basic characteristics of deep soft rock roadway convergence. High resistance and yield are the inherent requirements of nonlinear large deformation roadway support. (2) The asymmetric support of roof and floor violates the objective law that the floor heave of deep soft rock roadway is larger. (3) Roadway instability is the result of comprehensive action of internal and external factors, which reflects the gradual deterioration process of the rock mass. The purpose of the support is to effectively improve the bearing capacity of the surrounding rock and avoid this process. (4) It is an effective measure to improve the support efficiency and an important way to realize the stability control of nonlinear large deformation roadway by combine the parts organically and coordinate their bearing performance.

Soft rock coal roadwayInstability mechanismHigh resistance and yieldFull section convergenceStrong rheologicalBroken surrounding rockCoupling analysisCoupling support technologySOFT-ROCK ROADWAYFAILURE-MECHANISMCOAL-MINEDEFORMATION FAILURESURROUNDING ROCKTUNNELSSTABILITYSTRENGTHSTRESSMASS

Zhan, Qinjian、Shahani, Niaz Muhammad、Zheng, Xigui、Xue, Zhicheng、He, Yongyi

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Guangdong Univ Petrochem Technol

China Univ Min & Technol

2022

10.1016/j.engfailanal.2022.106374

Engineering failure analysis

Engineering failure analysis

EISCI
ISSN：1350-6307
年,卷(期)：2022.139
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