Investigation on the evolution and control of surrounding rock fracture under different supporting conditions in deep roadway during excavation period

Xie, Zhengzheng; Zhang, Nong; Feng, Xiaowei; Liang, Dongxu; Wei, Qun; Ming-yue, Weng

doi:10.1016/j.ijrmms.2019.104122

Cited by 73 publications

(43 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rocks have complex mechanical properties, laboratory experiments alone are not adequate to study their properties and some in situ measurements are necessary . In particular, strain information along the rock bolts should be collected to reveal long‐term movements of the rock mass and to allow an operator to take necessary precautions . With the development of optical fiber technology and its use in sensing and measurement, this technology is increasingly used in monitoring stress, overburden deformation, temperature, humidity, and moisture .…”

Section: Introductionmentioning

confidence: 99%

Monitoring and correction of the stress in an anchor bolt based on Pulse Pre‐Pumped Brillouin Optical Time Domain Analysis

Liu

Chai

Chen

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

Bolt is an important connection in underground construction and monitoring its stress characteristics is essential to evaluate the effectiveness of bolt. The strain information collected along a rock bolt reveals the long-term movement characteristics of rock mass, which greatly helps toward disaster prevention and risk warning.Grooving on the surface of a bolt and embedding an optical fiber is one of the main methods for monitoring the anchorage performance and stress distribution around the bolt in underground engineering. In this study, Pulse Pre-Pumped Brillouin Optical Time Domain Analysis (PPP-BOTDA) technology is used to evaluate the stress, axial force, and shear stress distribution of the bolt under tensile load for different types (grooved and nongrooved) of bolts embedded in concrete with resin as anchoring agent. The results show that the PPP-BOTDA sensor can be used to monitor the stress state of the bolt embedded in concrete with resin as anchoring agent when the bolt is subjected to a tensile force. However, the apparent stress value measured in this way is not the actual stress value of the bolt, but is an increased value caused due to the groove. The closer to the exposed end of the bolt, the greater is the deviation between the apparent stress value and the actual stress value of the bolt. Based on the monitoring results from this experimental study, a stress reduction calculation method is proposed, which can change the measured value into the actual stress of the bolt. K E Y W O R D Saxial force, bolt, PPP-BOTDA technology, pullout test, shear stress 2012 |

show abstract

Section: Introductionmentioning

confidence: 99%

Monitoring and correction of the stress in an anchor bolt based on Pulse Pre‐Pumped Brillouin Optical Time Domain Analysis

Liu

Chai

Chen

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…The mechanisms associated with the new support scheme are elaborated by means of numerical simulation from another publication. The reliability of this new supporting system has been confirmed in similar case studies [17,23]. In this study, the support effectiveness of the new support scheme was analyzed by some accurate field measurement methods.…”

Section: Resultsmentioning

confidence: 73%

“…However, the Daliuta coal mine is relatively shallow and has a simple geological condition. The driving speed of BMRET in China's deep roadways is around 15-25 m/day [17].…”

Section: Introductionmentioning

confidence: 99%

Application of Bolter Miner Rapid Excavation Technology in Deep Underground Roadway in Inner Mongolia: A Case Study

Qian

Zhang

et al. 2020

Sustainability

Self Cite

View full text Add to dashboard Cite

Rapid excavation could mitigate the imbalance relationship between excavation speed and production needs that plays a pivotal role in the sustainable development of large underground coal mines. This paper provides a case study on Bolter Miner Rapid Excavation Technology (BMRET) in Menkeqing Coal Mine, which has a high production of 13 million tons per year in Inner Mongolia. The temporal characterization of excavation procedures is analyzed in detail based on field monitoring data. The improvement of the roadway driving process and efficiency under a new support design is introduced, and corresponding evaluation methods, including parallel operation index ( P x ) and unit drilling-hole index ( D x ), are proposed for BMRET. A field application is conducted to verify the effectiveness of the improved BMRET, which fully considers the structure characteristic of the bolter miner machine. The performance and reliability of this new support scheme are monitored in terms of roadway convergence and axial force of cable through professional instrumentation programs in the field. The results show that the average excavation speed of the BMRET is 36.15 m/day (1080 m/month), an increase of 99.72% compared with the original excavation technology, which indicates that the BMRET could provide high efficiency in roadway excavation and effectively control the stability of deep roadways. It is pivotal to apply BMRET to ensure sustainable and highly efficient coal production. This case study provides reference and guidance for rapid excavation of deep underground roadways with similar geological conditions.

show abstract

“…Increasing the thickness of the roof anchoring layer to the stable rock layer can fully mobilize the performance of the deep surrounding rock and promote the increase of the resistance of bolt to limit the rock deformation in time. The close connection between the shallow soft rock and the deep stable rock layer, contributes to better control of the deformation of shallow soft rock, with the linkage of large and small displacement [27]. Moreover, it can also eliminate the development of the separated fissures outside the traditional short bolt, which improves the stability of the roof greatly.…”

Section: Long High-performance Sustainable Bolt Technologymentioning

confidence: 99%

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

et al. 2020

Self Cite

View full text Add to dashboard Cite

High-efficiency maintenance and control of the deep coal roadway roof stability is a reliable guarantee for safe production and sustainable development of a coal mine. With belt haulage roadway 3108 in MenKeqing coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to reveal the law of improving the bearing state of bolts by increasing the thickness of the roof anchoring layer. Also, the mechanism of the high-efficiency and long anchoring of the roof is revealed. Results show that increasing thickness of the roof anchorage layer could mobilize deep rock mass to participate in the bearing and promote the bolt to increase the resistance in a timely manner to limit the deformation of rock mass. Through the close link between shallow soft rock mass and deep stable rock mass, the deformation of the shallow rock mass is well controlled and so are the development and expansion of the roof separated fissures from shallow to deep. Long high-performance sustainable bolt technology for roof are proposed and carried out to control the stability of the deep roadway roof. Engineering practice indicates that deformations of roof could be efficiently controlled. The maximum deformations of the roof and sidewall-to-sidewall are 17 mm and 24 mm, respectively. No obvious separation fissures are found in the anchoring range of roof. This study provides a reference for roof stability control of deep roadway under similar conditions.

show abstract

Investigation on the evolution and control of surrounding rock fracture under different supporting conditions in deep roadway during excavation period

Cited by 73 publications

References 24 publications

Monitoring and correction of the stress in an anchor bolt based on Pulse Pre‐Pumped Brillouin Optical Time Domain Analysis

Monitoring and correction of the stress in an anchor bolt based on Pulse Pre‐Pumped Brillouin Optical Time Domain Analysis

Application of Bolter Miner Rapid Excavation Technology in Deep Underground Roadway in Inner Mongolia: A Case Study

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

Contact Info

Product

Resources

About