Changliang Han

China University of Mining and Technology

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Nong Zhang

China University of Mining and Technology

Zhengzheng Xie

China University of Mining and Technology

Houqiang Yang

China University of Mining and Technology

Yuxin Yuan

Xi'an University of Science and Technology

Dongjiang Pan

Xuzhou University of Technology

Feng Guo

China University of Mining and Technology

Kai Song

Wuhan University of Technology

Yuxin Guo

China University of Mining and Technology

Guojie Yan

China University of Mining and Technology

Chenghao Zhang

Harbin Institute of Technology

Cooperative Institutions

China University of Mining and Technology

Xuzhou University of Technology

China University of Petroleum, Beijing

Ministry of Education of the People's Republic of China

Huainan Mining Industry Group (China)

Central South University

Chinese Academy of Sciences

China University of Geosciences

Xi'an University of Science and Technology

Shandong University

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Discontinuous Deformation Characteristics of Deep Buried Roadway Roofs and Linkage Control of Thick Layer Cross-Boundary Anchorage: A Case Study

Energies (2023)

Changliang Han Nong Zhang Houqiang Yang Qifeng Zhao Kai Song

After deep mining, the discontinuous deformation characteristics of roadway roofs become more and more obvious, resulting in the emergence of separation fractures in the rock mass, which seriously affects the stability of the roof rock mass. By taking the air return roadway 21204 (ARR 21204) in Hulusu Coal Mine as the engineering background, this article reveals the discontinuous deformation characteristics of deep buried roadway roofs through field research, numerical simulation, theoretical analysis and engineering practice. After roadway excavation, the rock masses in different shallow roof horizons show different degrees of stress unloading, resulting in the occurrence of discontinuous deformation phenomena in rock masses. With the rise of the roof rock horizon, the degree of discontinuous deformation fades away until a continuous deformation zone with small deformation and stable rock strata appears. In addition, with the increase in the roadway buried depth, the extent of the discontinuous deformation of the roof and its extended range tend to increase. In view of the discontinuous deformation control of the roof, the technology of linkage control of thick layer cross-boundary anchorage is proposed. By establishing the thick anchorage ring of the roof, the bolts cross the discontinuous deformation zone to support the stable rock strata in the deep continuous deformation zone, thereby realizing the linkage control of the large and small displacement of the rock masses in these two zones and limiting the progressive damage of the roof rock mass from shallow to deep. The industrial test shows that the scope of the separation fracture zone on the roof is controlled at the shallow stratum of 0.85 m due to the great decrease in the surface displacement of roadway, which effectively restricts the progressive upward extension of the discontinuous deformation zone of the roof. The research results can provide references for the safe and efficient control of roadway roofs under deep mining conditions.

10.3390/en16052160

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Citations (6)

Failure mechanism and lessons from two-wing polycrystalline diamond compact drill bit drilling in coal roadways

Engineering Failure Analysis (2024)

Feng Guo Nong Zhang Zhengzheng Xie Changliang Han Yongle Li

Bit (key)

Polycrystalline diamond

Drill bit

Failure mechanism

10.1016/j.engfailanal.2024.109089

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Citations (1)

A rapid observation method applied to roadway cross-section reduction

Journal of China University of Mining and Technology (2011)

Changliang Han

Section (typography)

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Deformation Field Evolution and Failure Mechanisms of Coal–Rock Combination Based on the Digital Speckle Correlation Method

Energies (2019)

Zhengzheng Xie Nong Zhang Fanfei Meng Changliang Han Yanpei An

The stability of a deep composite roof is a powerful guarantee for the safe and efficient production of a coal mine. The coal–rock combination, the single rock or coal bodies have different bearing capacity; thus, we can accurately obtain the deformation field evolution and failure mechanisms of the combination, which is useful in the deformation control of a composite roof. In this study, based on the digital speckle correlation method (DSCM), a uniaxial compression test was applied to coal–rock combinations with different height ratios. The results revealed that the compressive strength, elastic modulus, and secant modulus of the combination gradually decreased, while the decreasing amplitude weakened with the increase of coal height. Additionally, the strain field map of the combination had different characteristics in different stages. As the height of the coal body continuously increased, the gradient of the strain cloud and the area of local strain increase moved upwards. Moreover, the cracks caused by the failure of the coal body in the combination triggered the failure of the rock body. According to the test results, two principles are proposed for the deformation control of the composite roof, and are expected to be useful in applications for the similar geological conditions.

Digital image correlation

10.3390/en12132511

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Citations (26)

Little about the essentiality of the muscle capability of cooperation and relaxation in sprinsh teaching

Journal of Jinggangshan Medical College (2006)

Changliang Han

The sprint teaching is one of the important contents in the physical training.Along with the improving of the the training technic,it is not enough focusing on the step length and step frequency,the relaxation capability must be the key point.I have consulted a lot of literature and data to anlyse the strengthen of the relaxation capability,which should improve the speed.The article is something primary about the the cooperation and relaxation capability of the muscle,and I wish people would pay more attention to this in sprint teaching and training.

Sprint

Muscle relaxation

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Digital image processing-based automatic detection algorithm of cross joint trace and its application in mining roadway excavation practice

International Journal of Mining Science and Technology (2022)

Yuxin Yuan Nong Zhang Changliang Han Sen Yang Zhengzheng Xie

This paper proposes a digital image processing-based detection algorithm for cross joint traces of coal roadway heading face. Initially, the acquired images were preprocessed, i.e., adaptive correction was conducted for non-uniform illumination images based on the 2D gamma function. The edge detection algorithm was then applied to extract the edges of the structural plane, followed by the filtration of the non-structural plane noises. Moreover, the Hough transform algorithm was applied to extract the linear edges; finally, the edges were locally connected in accordance with the angle and distance criteria. The experimental results show that this algorithm can be used to reduce the noise caused by non-uniform illumination and avoid the mutual interference of multi-scale edges, so as to effectively extract the traces of the cross joint. Furthermore, Q-system and rock mass rating (RMR ) , were applied to conduct a quantitative evaluation on the stand-up time of unsupported roof in the four test images. The Q-system quality scores are 26.7, 43.3, 3.1, and 6.7, and the RMR quality scores are 56.84, 58.73, 48.42, and 51.42, respectively. The stand-up time of unsupported roofs with a span of 4.6 m are 30, 36, 7.7 and 14 d, respectively.

Hough Transform

10.1016/j.ijmst.2022.09.009

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Citations (16)

Multi-scale experimental study on the failure mechanism of high-strength bolts under highly mineralized environment

Geomechanics and Geophysics for Geo-Energy and Geo-Resources (2024)

Zhe He Nong Zhang Zhengzheng Xie Qun Wei Changliang Han

Abstract High-strength bolts have become indispensable support materials in geotechnical engineering, but the incidence of safety accidents caused by bolt fractures under complex geological conditions is increasing. To address this challenge, this study focuses on a typical roadway in the Xinjulong coal mine, employing a combination of mechanical performance testing, microscopic and macroscopic analyses to investigate the failure mechanism of bolt breakage. The research indicates that the cracks in the failed bolts underground exhibit subcritical patterns, with the presence of oxides and Cl elements, and multiple intergranular fractures internally, consistent with the characteristics of stress corrosion failure. Additionally, inherent defects in the bolts are also a primary cause of failure. For instance, for type A bolts, the levels of P and S elements significantly exceed the normative requirements, forming inclusions, while the low content of elements like Si and V leads to reduced plasticity, toughness, and corrosion resistance. Furthermore, the excessive pitch in type A bolts leads to stress concentration and cracking under complex loads. The study concludes that the synergistic effect of stress corrosion cracking and inherent flaws in bolts are the main causes of failure. Therefore, it is recommended to enhance the reliability and safety of bolt support by optimizing the bolt shape and developing anti-corrosion bolts, thereby achieving long-term stability in underground engineering.

Failure mechanism

10.1007/s40948-024-00824-3

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Efficient Excavation and Support Cooperation Technology for Surrounding Rock of Deep Buried Long-Distance and Large Section Gob-Side Roadway: A Case Study

Geofluids (2022)

Houqiang Yang Changliang Han Nong Zhang Xudong Li Yitao Liu

The gob-side roadway technology is widely used in coal mining in China, as it can improves the recovery rate of coal resources and alleviate the shortage of mining replacement. However, it is still difficult to control the stability of surrounding rock in gob-side roadway under deeper mining depth and more complex stress environment. With the auxiliary transportation roadway 30207 (ATR 30207) of the Muduchaideng Coal Mine as engineering background, this paper introduces the engineering case of gob-side roadway characterized by deep buried, long-distance, and large section. Through comprehensive methods, we studied and put forward the efficient excavation-support cooperation technology for surrounding rock of gob-side roadway. The research shows that the head-on cutting of gob-side roadway causes the stress to transfer and gradually adjust in the heading face to form a steady-state advanced abutment stress field. The coupling effect of the advanced abutment stress and the lateral abutment stress of goaf are the main reasons for repeated hole collapse of anchor cable drilling in solid coal rib, development and expansion of the roof separation fracture, and the low excavation speed. Supposed that upon the heading face support is completed, the next excavation-support cycle is quickly started during the early stage of stress adjustment, and the time effect can be fully utilized to alleviate the disturbance intensity of the advanced abutment stress in the heading face, as well as reduce the damage of rock mass. This paper puts forward the time-effect collaborative control countermeasures of the roof and rib in gob-side roadway of “hole collapse anchor cable of solid coal rib lag construction and waits for pressure relief and rapid excavation-support cycle in the heading face.” Engineering practice shows that the mine pressure behavior of roadway roof and solid coal rib is effectively controlled, and the roadway forming speed is greatly improved, which can provide reference for the efficient excavation-support design of gob-side roadway under the conditions of deep buried, long-distance, and large section in similar deep mines.

Abutment

10.1155/2022/6895887

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Citations (5)

Rapid Excavation and Stability Control of Deep Roadways for an Underground Coal Mine with High Production in Inner Mongolia

Sustainability (2018)

Zhengzheng Xie Nong Zhang Deyu Qian Changliang Han Yanpei An

For large underground coal mines producing 10 million tons a year, rapid excavation and stability of deep roadways are pivotal to ensure sustainable, safe, and efficient production. This paper provides a case study of Hulusu Coal Mine in Inner Mongolia, where roadway excavation speed was insufficient to meet production needs. Moreover, deformation in the roofs of the roadways was severe. To achieve rapid excavation and control the stability of deep roadways, a new support system was proposed and constructed in a roadway at a depth of 640 m. The system consisted of long flexible bolts pretensioned to high levels and spaced at large intervals. Roadway excavation and construction of a support system were conducted simultaneously. Field measurements indicated that the new support system effectively controlled deformation and fracture development during excavation and mining. Maximum displacements of the roof during excavation and mining were 10 and 30 mm, respectively. The axial load on bolts surged during excavation as a result of slight deformations caused by excavation operations. This active response of the bolts is beneficial to the prevention of roof deformation during excavation and mining. During mining, fissures propagated up to only a depth of 1.4 m into the surrounding rock mass. The new support system formed a thick reinforced anchorage zone, which greatly improved the bearing capacity of the roof. Compared with the previous support system, the new system allowed the maximum excavation speed (31.5 m/day) to increase by 85.3%. This successful case provides a practical reference for similar roadway projects.

Inner mongolia

Electronic stability control

10.3390/su10041160

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Citations (33)

Development and Simulation of an Adaptive Vehicle for In-Pipe Inspection Task

Lecture notes in electrical engineering (2012)

Hong Zhao Changliang Han

10.1007/978-3-642-25778-0_79

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