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学者姓名：龚秋明
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Abstract ：
The brittle failure induced by high in-site stress occurring at the tunnel face significantly affect the TBM performance. To study the rock mass failure mechanism under the combined effect of high stress and TBM cutters, three groups of true-triaxial rockburst tests were conducted, simulating the failure processes using the loading scheme "one-single face free and the remaining five surfaces loaded". Conditioned granite specimens previously cut by the TBM cutter were prepared, and the different stressed conditions were determined based on the in-situ stress field of the Yinhan water conveyance tunnel. As the confining stress increased, the peak strength of the rock specimen also increased, and the final rupture was more violent, leading to a rockburst. The failure process recorded by the high-speed camera and the failure pattern showed a clear change. The rock conditioned by the TBM cutter was more susceptible to brittle failure under high stress, and the failure depth was greater. The stressstrain curves in the & sigma;1 direction and the AE characteristics indicated that as the loading stress increased, the damage in the rock changed from a dominant tensile failure to a dominant shear failure, gradually extending to deeper areas of the rock. This alteration changed the rock mass mechanical behavior of the tunnel face, i.e., its stability and boreability, consequently influencing the rock breakage process by TBM cutters. As the severity of failure increased, the TBM performance shifted from a low efficiency rock-breaking performance limited by the cutter thrust to a high efficiency rock-breaking performance limited by the muck capacity and safety control.
Keyword ：
Tunnel face Tunnel face TBM performance TBM performance High in-situ stress High in-situ stress True-triaxial rockburst test True-triaxial rockburst test Rockburst Rockburst
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| GB/T 7714 | Lu, Jianwei , Gong, Qiuming , Yin, Lijun et al. True-triaxial experimental study on the brittle failure of granite conditioned by the TBM disc cutter [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2023 , 170 . |
| MLA | Lu, Jianwei et al. "True-triaxial experimental study on the brittle failure of granite conditioned by the TBM disc cutter" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 170 (2023) . |
| APA | Lu, Jianwei , Gong, Qiuming , Yin, Lijun , Thuro, Kurosch , Su, Guoshao . True-triaxial experimental study on the brittle failure of granite conditioned by the TBM disc cutter . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2023 , 170 . |
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Abstract ：
Button cutters are commonly used in hard rock drilling because the inserted carbide buttons provide exceptional wear resistance, impact resistance, and high strength in challenging geological formations. One of the most pressing issues in designing a button cutter is to study the rock breaking mechanisms of carbide buttons. In this study, the three-dimensional discrete element method (DEM) was employed to investigate the rock breaking mechanism and cutting performance of five widely used carbide buttons, i.e., spherical, saddle, wedge, conical, and parabolic buttons. The simulation results were compared with laboratory tests to reveal the rock indentation process. The crack propagation pattern, energy dissipation, and damage evolution associated with the force-penetration depth curve were investigated. Tensile damage was the primary determinant for crack propagation and coalescence. By systematically exploring the penetration index, specific energy, and crack propagation characteristics, the conical button had a high rock breaking efficiency when the penetration depth was low, and the saddle button had a high rock breaking efficiency when the penetration depth was high. The findings can provide references for the design of a button cutter.
Keyword ：
carbide button carbide button numerical simulation numerical simulation crack propagation crack propagation breaking mechanism breaking mechanism damaged zone damaged zone
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| GB/T 7714 | Ma, Yanan , Gong, Qiuming , Zhou, Xiaoxiong et al. The Modelling of Rock Fragmentation Mechanisms by Carbide Buttons Using the 3D Discrete Element Method [J]. | APPLIED SCIENCES-BASEL , 2023 , 13 (10) . |
| MLA | Ma, Yanan et al. "The Modelling of Rock Fragmentation Mechanisms by Carbide Buttons Using the 3D Discrete Element Method" . | APPLIED SCIENCES-BASEL 13 . 10 (2023) . |
| APA | Ma, Yanan , Gong, Qiuming , Zhou, Xiaoxiong , Yin, Lijun , Ma, Hongsu . The Modelling of Rock Fragmentation Mechanisms by Carbide Buttons Using the 3D Discrete Element Method . | APPLIED SCIENCES-BASEL , 2023 , 13 (10) . |
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Abstract ：
The HuaiFu tunnel section of Shenzhen Metro Line 12 is located in Baoan District, Shenzhen, with a total length of approximately 1750 m. The excavated grounds are extremely complicated, with soft soil ground, mixed ground, fault zones, and hard rock ground with a length of over 1200 m. A dual-mode shield TBM with EPB and single-shield modes was employed in the tunnel section. To evaluate the tunnelling performance of the dual-mode shield TBM, two sets of monitoring systems were applied to acquire the cutterhead working performance during the dual-mode shield TBM tunnelling, and the tunnelling difference between the dual-mode shield TBM and composite EPB shield in hard rock ground were analysed. As for the cutterhead working performance, relative sliding occurred between the cutter and tunnel face, and the cutter wear curve increased linearly in any ground and excavation modes. Under different grounds and excavation modes, the cutterhead temperature thresholds were different, and the time-domain and frequency-domain of the cutterhead vibration were different. As for the tunnelling difference, the single-shield mode offered a higher penetration rate, fewer cutter replacements, lower energy consumption and faster advance rate than the EPB mode. The advance rate of EPB mode was higher than that of the composite EPB shield due to the faster cutterhead rotation speed. The results can provide guidance for excavation mode selection of the dual-mode shield TBM and type selection of TBM for similar grounds.
Keyword ：
Monitoring system Monitoring system Cutterhead working performance Cutterhead working performance Composite EPB shield Composite EPB shield Excavation mode Excavation mode Tunnelling performance Tunnelling performance Dual-mode shield TBM Dual-mode shield TBM
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| GB/T 7714 | Wu, Fan , Gong, Qiuming , Li, Zhigang et al. Study on Tunnelling Performance of Dual-Mode Shield TBM by Cutterhead Working Performance and Tunnelling Difference Comparison: A Case in Shenzhen Metro Line 12 [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (7) : 5315-5333 . |
| MLA | Wu, Fan et al. "Study on Tunnelling Performance of Dual-Mode Shield TBM by Cutterhead Working Performance and Tunnelling Difference Comparison: A Case in Shenzhen Metro Line 12" . | ROCK MECHANICS AND ROCK ENGINEERING 56 . 7 (2023) : 5315-5333 . |
| APA | Wu, Fan , Gong, Qiuming , Li, Zhigang , Huang, Liu , Sun, Qianwei , Liu, Qiuyu . Study on Tunnelling Performance of Dual-Mode Shield TBM by Cutterhead Working Performance and Tunnelling Difference Comparison: A Case in Shenzhen Metro Line 12 . | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (7) , 5315-5333 . |
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Abstract ：
HighlightsThe indentation tests with different types of carbide buttons were conducted.The indentation process and crack pattern under the indenter were analyzed.The conical and saddle buttons are better by exploring the PI, SE, and crack pattern.
Keyword ：
Button cutter Button cutter Rock-breaking efficiency Rock-breaking efficiency Fluorescent crack visualization method Fluorescent crack visualization method Indentation test Indentation test Carbide button Carbide button
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| GB/T 7714 | Ma, Yanan , Gong, Qiuming , Yin, Lijun et al. Preliminary Study on the Carbide Button Selection of a Button Cutter for Beishan Granite Using Indentation Tests [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (10) : 7721-7735 . |
| MLA | Ma, Yanan et al. "Preliminary Study on the Carbide Button Selection of a Button Cutter for Beishan Granite Using Indentation Tests" . | ROCK MECHANICS AND ROCK ENGINEERING 56 . 10 (2023) : 7721-7735 . |
| APA | Ma, Yanan , Gong, Qiuming , Yin, Lijun , Ma, Hongsu , Kang, Le . Preliminary Study on the Carbide Button Selection of a Button Cutter for Beishan Granite Using Indentation Tests . | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (10) , 7721-7735 . |
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Abstract ：
In most cases, TBM tunnels are constructed in jointed rock masses. Rock chip properties can be used to interpret the response of the rock mass to the TBM tunnelling. Engineering-scale simulations can help us to explain the relationship between rock chip properties and rock mass conditions. In this study, a GPU-based DICE2D programme is presented to meet the computation requirements of the engineering-scale simulation. The smooth joint model (SJM) was also incorporated into DICE2D via an improved joint side checking approach. Using the SJM-embedded DICE2D, a multiple-cutter penetration model was set up. The combined influence of joint spacing and angle on the rock breaking process and rock chip properties were analysed. Further, a rock chip extraction algorithm was proposed to quantify the shape and size distribution. The results showed that in the rock masses with the close joint spacing, the smaller the alpha angle, the blockier the rock chips were. As the joint spacing increase, the rock chips become flat. Both the joint spacing and alpha angle affected the size distribution. The overall size of rock chips decreased with the increasing joint spacing, and first increased with the increasing alpha angle and then decreased when the alpha angle was over 60 degrees. The very closely jointed rock mass at the alpha angle of 90 degrees was an exception because rock slabs would be produced. In addition, in the jointed rock mass with the joint spacing less than 250 mm and 60 degrees-75 degrees alpha angle, or in the highly jointed rock masses with 90 degrees alpha angle, significant differences between the forces acting on the different cutters were revealed.
Keyword ：
Rock breaking mechanism Rock breaking mechanism Jointed rock mass Jointed rock mass Tunnel boring machine Tunnel boring machine DICE2D DICE2D Rock chip Rock chip
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| GB/T 7714 | Zhou, Xiaoxiong , Gong, Qiuming , Liu, Xiaoli et al. Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2022 , 55 (12) : 7547-7568 . |
| MLA | Zhou, Xiaoxiong et al. "Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation" . | ROCK MECHANICS AND ROCK ENGINEERING 55 . 12 (2022) : 7547-7568 . |
| APA | Zhou, Xiaoxiong , Gong, Qiuming , Liu, Xiaoli , Xu, Hongyi , Yin, Lijun . Rock Chip Properties of TBM Penetration in Jointed Rock Masses Based on an Improved DICE2D Simulation . | ROCK MECHANICS AND ROCK ENGINEERING , 2022 , 55 (12) , 7547-7568 . |
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Abstract ：
A new concept called the transmission ratio of ground volume loss (TRGVL) is proposed to describe the variation law of ground volume loss with depth above the tunnel. Based on the developed Gaussian function, the formula for TRGVL is deduced. Further, the first-order derivative of TRGVL is presented to evaluate the dilation and compression degree of the soil at any depth above the tunnel. A total of 15 cases, involving eight field project cases and seven model test cases, are investigated to validate rationality of the proposed formula. The results of field projects and model test cases indicate variation in TRGVL presents four forms. By analysing the volumetric deformation of the soil above the tunnel, formation mechanism of the each form of TRGVL is revealed. Finally, the evolution of the four forms of TRGVL is used to evaluate the disturbance degree of the soil above the tunnel.
Keyword ：
Soil volumetric deformation Soil volumetric deformation Ground volume loss Ground volume loss Surface and subsurface settlement Surface and subsurface settlement Developed Gaussian function Developed Gaussian function Tunnel excavation Tunnel excavation
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| GB/T 7714 | Lin, Qingtao , Tian, Yu , Lu, Dechun et al. A prediction method of ground volume loss variation with depth induced by tunnel excavation [J]. | ACTA GEOTECHNICA , 2021 , 16 (11) : 3689-3707 . |
| MLA | Lin, Qingtao et al. "A prediction method of ground volume loss variation with depth induced by tunnel excavation" . | ACTA GEOTECHNICA 16 . 11 (2021) : 3689-3707 . |
| APA | Lin, Qingtao , Tian, Yu , Lu, Dechun , Gong, Qiuming , Du, Xiuli , Gao, Zhiwei . A prediction method of ground volume loss variation with depth induced by tunnel excavation . | ACTA GEOTECHNICA , 2021 , 16 (11) , 3689-3707 . |
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Abstract ：
盾构隧道施工刀盘状态实时监测系统研制
Keyword ：
盾构机 盾构机 实时监测系统 实时监测系统 滚刀磨损 滚刀磨损 刀盘状态 刀盘状态 滚刀转速 滚刀转速
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| GB/T 7714 | 龚秋明 , 王庆欢 , 王杜娟 et al. 盾构隧道施工刀盘状态实时监测系统研制 [J]. | 龚秋明 , 2021 , 58 (2) : 41-50 . |
| MLA | 龚秋明 et al. "盾构隧道施工刀盘状态实时监测系统研制" . | 龚秋明 58 . 2 (2021) : 41-50 . |
| APA | 龚秋明 , 王庆欢 , 王杜娟 , 邱海峰 , 吴帆 , 现代隧道技术 . 盾构隧道施工刀盘状态实时监测系统研制 . | 龚秋明 , 2021 , 58 (2) , 41-50 . |
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Abstract ：
下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究
Keyword ：
既有隧道 既有隧道 卵石地层 卵石地层 地表沉降 地表沉降 盾构下穿 盾构下穿 模型试验 模型试验 隧道变形 隧道变形
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| GB/T 7714 | 路德春 , 雷春明 , 李晓强 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 [J]. | 路德春 , 2021 , 47 (4) : 328-337 . |
| MLA | 路德春 et al. "下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究" . | 路德春 47 . 4 (2021) : 328-337 . |
| APA | 路德春 , 雷春明 , 李晓强 , 苗金波 , 龚秋明 , 杜修力 et al. 下穿施工时盾构-卵石地层-既有隧道相互作用模型试验研究 . | 路德春 , 2021 , 47 (4) , 328-337 . |
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Abstract ：
Intelligent tunnelling has become an important direction for the development of TBM technology recently. As a result of the interaction between rock mass and TBM cutterhead, mucks are very important for predicting rock mass conditions and evaluating rock breaking efficiency. A real-time muck analysis system for assistant intelligence TBM tunnelling is proposed in this paper. Machine vision was applied to take the muck images continuously in the high-speed conveyor belt. The image segmentation and feature extraction of the mucks are conducted by using a deep learning algorithm. The proposed system also measured the mass and volume flow of the muck by installing a belt scale and a scanner to monitor the stability of the rock mass on the tunnel face. After the system was completed, it was installed on an indoor simulation experimental platform. A series of experiments were conducted to verify the design functions and measurement accuracy. Additionally, the system was applied to a TBM tunnelling project. The application results showed that the proposed system reached its design requirements and functions, and can provide muck data support for further assistant intelligent TBM tunnelling. © 2020 Elsevier Ltd
Keyword ：
Belt conveyors Belt conveyors Deep learning Deep learning Rocks Rocks Image segmentation Image segmentation Rock mechanics Rock mechanics Learning algorithms Learning algorithms
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| GB/T 7714 | Gong, Qiuming , Zhou, Xiaoxiong , Liu, Yongqiang et al. Development of a real-time muck analysis system for assistant intelligence TBM tunnelling [J]. | Tunnelling and Underground Space Technology , 2021 , 107 . |
| MLA | Gong, Qiuming et al. "Development of a real-time muck analysis system for assistant intelligence TBM tunnelling" . | Tunnelling and Underground Space Technology 107 (2021) . |
| APA | Gong, Qiuming , Zhou, Xiaoxiong , Liu, Yongqiang , Han, Bei , Yin, Lijun . Development of a real-time muck analysis system for assistant intelligence TBM tunnelling . | Tunnelling and Underground Space Technology , 2021 , 107 . |
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Abstract ：
Rock mass characteristics (RMC) model is the one of serval prediction models for TBM penetration rate that considers the interaction between the rock mass and cutters. The first version was developed in 2009. However, it was a relative site specific model and the machine parameters were ignored. To update the RMC model, a comprehensive data base which included the results of the laboratory cutting tests and the in site penetration tests was compiled. Firstly, the correction factors of the cutter spacing and cutter shape were set up based on the laboratory tests, which were then used to normalize the data with the given machine parameters. Finally, two critical parameters in RMC model, i.e., the specific rock mass boreability index (SRMBI) and the exponent c, were estimated by regression analysis using the rock mass parameters. Now SRMBI in the updated model represents the boreability of a rock mass excavated by the given machine setup at penetration rate of 1 mm/rev. A higher SRMBI implies the rock mass is more difficult to be bored. The exponent c decides the increment in cutter normal force for the increasing penetration rate, c together with the rock mass strength reflect the different TBM cutting modes. Since the rock specimens in the laboratory tests was intact and the rock masses in the in site penetration tests contain the joints, the updated model reflects the reduction in the required thrust force caused by the joints in nature. The updated RMC model covered a wide range of the geological context and machine parameters. It could be used to predict TBM penetration rate and optimize the operating parameter in the given stroke. The equations in the updated model need further modification when more test data is collected, and the in situ stress needs to be taken into consideration.
Keyword ：
Rock mass boreability Rock mass boreability Rock breakage process Rock breakage process TBM penetration Rate TBM penetration Rate Test database Test database TBM performance Prediction TBM performance Prediction
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| GB/T 7714 | Gong, Qiuming , Xu, Hongyi , Lu, Jianwei et al. Rock mass characteristics model for TBM penetration rate prediction- an updated version [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2021 , 149 . |
| MLA | Gong, Qiuming et al. "Rock mass characteristics model for TBM penetration rate prediction- an updated version" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 149 (2021) . |
| APA | Gong, Qiuming , Xu, Hongyi , Lu, Jianwei , Wu, Fan , Zhou, Xiaoxiong , Yin, Lijun . Rock mass characteristics model for TBM penetration rate prediction- an updated version . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2021 , 149 . |
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