Protection Technique of Support System for Dynamic Disaster in Deep Underground Engineering: A Case Study

Yunqiu Liu, Yuemao Zhao (), Kun Wang, Gongcheng Li and Zhengchen Ge
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Yunqiu Liu: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yuemao Zhao: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kun Wang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Gongcheng Li: School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China
Zhengchen Ge: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Sustainability, 2023, vol. 15, issue 9, 1-13

Abstract: During excavation in a deep tunnel, dynamic disaster is an extremely severe impact failure. The necessity of an energy-absorbing support system is analyzed for different characteristics of dynamic disaster (rockburst) failure. The energy-absorbing support system design includes a combination of early-warning, energy-absorbing bolts, and other components. This support system is designed to meet the energy requirement of a rockburst disaster based on an early warning. The energy-absorbing rockbolt uses the stepwise decoupling technique to realize the brittle-ductile transition of the structure, which is referred to as a stepwise decoupling rockbolt (SD-bolt). The ultimate force, ultimate deformation, and energy were calculated as 241 kN, 442.3 mm, and 95.89 kJ under static pull-out load. Monitored by a microseismic system, the support system was tested by moderate rockburst disaster impact on site. Considering similar rockburst disaster failure cases, this energy-absorbing support system can reduce rockburst disaster damage to a certain extent and improve overall safety during deep engineering construction.

Keywords: dynamic disaster; energy absorbing; support system; pull-out test (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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