Strength of fabricated enclosed roadway support structure for TBM-excavated coal mine roadways: Experimental and numerical study

Tang, Bin; Song, Cheng; Yeboah, Mathias; Cheng, Hua; Tang, Yongzhi; Wang, Chuanbing

doi:10.1016/j.tust.2022.104779

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The distribution of support pressure is the key factor to determine the stability of the working face and ensure the safety of miners. The evolution of the support pressure distribution is affected by many factors, such as the geological structure of the coal seam, the excavation method, the properties of the roof and floor strata, geological fault zones, and the type of filling wall [17,18]. Generally, as the work faces the deep coal seam, the support pressure tends to increase due to the increase in the weight of the overlying strata.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

et al. 2023

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Monitoring and providing warnings for coal mine rockburst disasters is a worldwide problem. Several rockburst accidents have occurred in a 1301 belt transport chute near a 1300 fully mechanized caving mine face. To address this issue, an empirical study of the occurrence mechanism of rockbursts in the adjacent area of the fully mechanized top-coal caving face was carried out. This paper mainly addresses the following issues: (1) based on microseismic monitoring technology, the distribution characteristics of the host-rock-supported pressure of the 1300 working face were measured, and the evolution and distribution of the deep-well caving working face host-rock-supported pressure were analyzed. It is revealed that the occurrence mechanism of rockburst in the adjacent area is actually caused by the evolution and superposition of the lateral abutment pressure of the 1300 stope, and the stress of the original rock along the 1301 belt transport down chute; (2) a theoretical calculation model of dynamic and static abutment pressure in longwall stope is built, and an example is tested. The results show that the peak position of lateral abutment pressure of the coal body outside the 1300 goaf is around 63 m, and the peak value of abutment pressure is around 47 MPa; (3) coal body stress monitoring, bolt dynamometer detection, and other means are compared and analyzed. At the same time, with the help of CT geophysical prospecting and drilling cutting measurements, it is concluded that the 1301 belt transport down chute is in the bearing pressure influence zone (superimposed zone), which further verifies the validity of microseismic analysis results and the accuracy of the above theoretical model. Based on this, the early warning system and prevention measures for rockburst based on microseismic monitoring are proposed. The engineering practice shows that the dynamic and static bearing pressure distribution and evolution law of the working face can be dynamically obtained by using microseismic technology, which provides a basis for the accurate prediction and treatment of rockbursts.

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Section: Introductionmentioning

confidence: 99%

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

et al. 2023

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Mechanical Behaviors of Steel Segment Support Structures for TBM-Excavated Coal Mine Tunnels: Experimental and Numerical Study

Tang,

Mao,

et al. 2024

Int J Civ Eng

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A Fully Prefabricated Pile-Wall Composite Scheme of Open-Cut Tunnel and the Mechanical Behavior of the Composite Structure during Construction

Ma,

Li,

2024

Buildings

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In open-cut assembled subway tunnels, foundation pit enclosure piles are typically cast in place. However, this conventional approach limits the functionality of the piles to serving as retaining structures during excavation, resulting in resource inefficiency and the underutilization of prefabrication techniques. To address this issue, a fully prefabricated pile-wall composite scheme is proposed for cut-and-cover tunnels to optimize the retaining effect of the piles and leverage the benefits of prefabricated technology. In this scheme, the retaining pile and lining are both prefabricated. The pile is the temporary retaining structure during pit excavation and a part of the sidewall. This scheme was researched and applied in Jinan, China. Field monitoring and numerical simulation were used to investigate the load transfer within the fully prefabricated pile-wall composite structure (PPWS) and its mechanical response, respectively. The results show: (1) The development of lateral earth pressures on the PPWS experienced three stages. The lateral earth pressure distribution indicates that the PPWS can fully activate the retaining effect of precast piles. (2) Following the backfilling of the joints, the horizontal displacement at the bottom of the precast pile reduced by 0.39 mm. Numerical simulation results indicate the effectiveness of precast pile restraint in PPWS. (3) The PPWS exhibited uniform deformation transition at the joints. The joints play a crucial role in coordinating deformation between the precast piles and sidewalls, utilizing the restraining effect of the precast piles.

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Strength of fabricated enclosed roadway support structure for TBM-excavated coal mine roadways: Experimental and numerical study

Cited by 3 publications

References 15 publications

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

Mechanical Behaviors of Steel Segment Support Structures for TBM-Excavated Coal Mine Tunnels: Experimental and Numerical Study

A Fully Prefabricated Pile-Wall Composite Scheme of Open-Cut Tunnel and the Mechanical Behavior of the Composite Structure during Construction

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