Pressure-relief effect of coal rock body of long distance lower protective seam mined based on FLAC3D

Xu, Na; Han, Lei

doi:10.1007/s12404-010-0402-2

Cited by 6 publications

(6 citation statements)

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“…Based on the energy dissipation theory, the optimal energy conversion ratio occurs when the TBM cutters break the rock mass into rock chips with larger size [21]. Meanwhile, invalid energy consumption occurs in the production of rock chips with smaller particle size (including the rock powder).…”

Section: Effective Rock-breaking Ratiomentioning

confidence: 99%

“…Rock chips in TBM are formed by the disc cutters cutting the rock palm surface. According to the rock fragmentation theory [21], the rock-breaking effect of TBM disc cutters is achieved by a mixed action of the tensile failure, crushing failure, and shearing failure of rock mass [22,23]. The rock chip information can directly reflect the "rock-machine" interaction mechanism, identify the quality of surrounding rock and the geology in TBM construction, and indirectly reflect the mechanical properties and tunneling parameters of TBM [24].…”

Section: Introductionmentioning

confidence: 99%

“…TBM transforms mechanical energy into surface energy and increases the free surface in the process of rock breaking [21]. The higher the degree of rock fragmentation, the larger the total surface area of rock chips, and the more work the machine performs.…”

Section: Introductionmentioning

confidence: 99%

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Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Zeng,

Yan,

et al. 2023

Geofluids

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The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking efficiency of TBM. This study is aimed at defining a novel index (effective rock-breaking ratio, P r ) to identify the rock-breaking efficiency of TBM based on the rock chip information. To evaluate this approach, a series of field sieving and measuring tests of rock chips was conducted at the water conveyance tunnel construction projects of China. The rock-breaking efficiency evaluation and tunneling parameter improvement of TBM were researched based on P r index. The results showed as follows: (1) from the perspective of energy conversion, the rock chip surface area was calculated through the rock chip cumulative volume distribution model. P r is used to evaluate the rock-breaking efficiency of TBM based on the proportion of surface area of rock chips with particle size larger than 5 mm; (2) P r has a good linear correlation with coarseness index (CI) and specific energy (SE), the higher the TBM tunneling efficiency, the larger P r and CI values, the less SE values; (3) P r increases at first and then decreases with the rise of thrust force of TBM. The optimal thrust force intervals for grade II and III surrounding rocks can be determined to improve the rock-breaking efficiency of TBM. Findings from this study are insightful in terms of accurately evaluating the excavation efficiency and improving the tunneling parameters of TBM.

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Section: Effective Rock-breaking Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Zeng,

Yan,

et al. 2023

Geofluids

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“…Multi-seam coal mining model shown in Figure 5 is built by the finite element analysis software FLAC 3D [17]. As it can track the stress changes and failure behavior of analysis object based on the finite difference algorithm and large deformation, this software is particularly appropriate for the researches on rock mass, and has become one of the most important tools in mining engineering.…”

Section: Construction Of Analysis Modelmentioning

confidence: 99%

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Zhang¹,

Shimada²,

Sasaoka³

et al. 2013

IJG

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To explore the impact of lateral stress concentration in interlayer rock stratum on the exploitation of protected coal seam, a field experiment was carried out in a multi-seam mining structure. Lateral stress redistribution and interlayer rock failure behavior were surveyed. Then an assistant numerical investigation was implemented to evolve the effect of liberated seam mining and its influence on stress reconstruction in surrounding rock mass. The cause of lateral stress concentration and its impact were discussed finally. Key findings turn out that a certain lateral stress increases in interlayer rock stratum and concentrates on its lower region. Lateral stress concentration and interlayer rock failure are interactional. The former is an inducing factor of the latter; the latter promotes the increase of concentration degree. Extent of lateral stress concentration increases to the maximum as seam distance is about 50 m. But the efficacy of liberated seam mining decreases as the seam spacing gets larger. Protected seam mining is then classified based upon the impact of lateral stress concentration, which helps to prevent the rock burst hazard and then to achieve a reliable mining in deep mines.

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“…Wang et al [13] and Xue et al [14] formulated a fracture evolution law for the overlying strata following coal mining. Tang et al [15], Zhang et al [16], Xu and Han [17], and Zhang et al [18] analyzed the stress distribution and deformation of the protected layer during the mining process of the lower protective layer. Yang et al [19] studied the deformation and failure characteristics of the overlying strata, development law of mining stress and fracture, and size of the stress release area.…”

Section: Introductionmentioning

confidence: 99%

Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Xiong

Chang

et al. 2021

Geofluids

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To study the impact of mining of the lower protective layer on the deformation and failure characteristics of the upper roadway, these characteristics of an 879 gas drainage roadway were studied and analyzed during the mining of the II 1051 working face of the Zhuxianzhuang coal mine using similar simulation experiments and numerical simulation methods. The results indicate that with the continuous excavation of the working face, the range of impact of the mining stress gradually spreads and exceeds the level of the roadway. At the present time, the roadway is in a mining stress-rising area. The two sides of the roadway are sheared, and the roof and floor are under tension–shear composite failure. The floor is the most gravely damaged—the depth of its damage is 2.5 m, and the depths of damage on either side and of the roof are approximately 1–2 m. During the advancing process of the working face, the deformation of the roadway increases slowly at first, then increases sharply, and tends to be stable thereafter. The deformation of the floor is the largest, followed by those of the two sides and the roof; the values are 800, 400, and 300 mm, respectively.

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Pressure-relief effect of coal rock body of long distance lower protective seam mined based on FLAC3D

Cited by 6 publications

References 0 publications

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

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