Analysis of Deformation Damage in Deep Well Roadway and Supporting Countermeasures
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TECHNICAL NOTE
Analysis of Deformation Damage in Deep Well Roadway and Supporting Countermeasures Jianjun Shi . Jicheng Feng . Rui Peng . Quanjie Zhu
Received: 8 January 2020 / Accepted: 9 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract The roadway with a depth of 760 m in Menkeqing coal mine is located in a complex rock formation, with mudstone containing gangue, serious roof drainage, developed fractures, and surrounding rock softening under water. In addition, affected by mining, the original support of return air roadway in 2201 workface has been difficult to be effective. In this study, FLAC3D was used for analysis of the process and mechanism of roadway deformation. Based on the analysis and combined with the research on deep roadway support theory research, it is determined that the numerical simulation of the joint support form of the bottom angle of the roadway is effectively controlled by using the 45° bottom corner bolt to control the heaving floor of the roadway. In other words, the surrounding rock grouting ? anchor cable spraying ? bottom corner bolt, and not only the heaving floor of the roadway has been effectively controlled, but also the coal rib and the roof support also have a more obvious prominent effect. According to the design and construction, the roadway maintenance condition is good after the field observation, which indicates that the design parameters are reasonable and can meet the requirements of roadway
J. Shi (&) J. Feng R. Peng Q. Zhu School of Safety Engineering, North China Institute of Science and Technology, Yanjiao Town, East of Beijing 065201, China e-mail: [email protected]
use, which can provide reference for roadway support under similar conditions. Keywords Deep roadway Heaving floor Numerical simulation Bottom corner bolt
1 Introduction According to statistics, China’s coal mine buried in a depth of 1000 m or less amounts to reserves 2.95 trillion ton, accounting for 53% of the total coal resources in the country (Zhang et al. 2013; Ye et al. 2018). As a result of long-term mining, shallow resources are increasingly depleted, so they have to be transferred to deep mining. At present, the depth of coal mining is increasing at a rate of 8–12 m/a, and the eastern mine area is developing at a rate of 10–25 m/ a., and many coal mines are expected to enter a depth of 1000–1500 m in the next 10 years (He et al. 2005; Kang et al. 2015; Xue et al. 2015). According to statistics, many mining depth have been are more than 600–800 m depth. And there are dozens of mines at a depth of more than a kilometer. The maximum mining depth has been is close to 1200 m, such as the majority of the Xinwen mining area, which has been transferred shifted to deep mining, with the average mining depth of more than 900 m (Shi et al. 2016; Sellers and Klerck 2000). It can be expected that as the demand for coal increases,
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Geotech Geol Eng
more a larger number of coal mines will enter the depth of mining below 1000 m (Wang
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