Investigations on Cutting Force and Temperature Field of Pick Cutter Based on Single Factor and Orthogonal Test Methods

Deng, Long-Chuan; Li, Xiaozhao; Chen, Yiwei; Zhuang, Qiya; Zhu, Longhai; Zhang, Chi

doi:10.1007/s00603-022-03099-w

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Orthogonal test analysis is a method based on mathematical statistics and orthogonal principle [24]. It involves selecting typical points from a large number of experimental points and arranging these in multifactor experiments scientifically by using an orthogo- measure can be divided into injecting with constant pressure or injecting w flow.…”

Section: The Orthogonal Test Modelmentioning

confidence: 99%

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Zhang

Meng

et al. 2023

Sustainability

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With the excavation of a metro station in a confined water-rich stratum as our background, the sensitivity of four typical recharge parameters is analyzed by using numerical simulation. Based on the orthogonal analysis method, an optimal recharge scheme was obtained. The results show that the main influential factors of ground settlement and groundwater recovery are recharge pressure and recharge depth. The main influential factor of retaining structure deformation and influence radius of recharge is the distance between the recharge wells and the foundation pit. For the groundwater recharging of a deep excavation in the water-rich confined area of Jinan, China, the optimal effect can be achieved when setting recharge wells with a depth of 50 m arranged in a line with a spacing of 10 m at a horizontal distance of 20 m away from the retaining wall and recharge pressure is 40 kPa. With the same construction difficulty, the maximum settlement in optimized scheme decreased 71.19%, the flux of groundwater recovery increased 11.96%, the maximum horizontal displacement of the wall decreased 15.61%, and the influence radius of recharge enlarged 8.62% compared to original scheme.

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Section: The Orthogonal Test Modelmentioning

confidence: 99%

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Zhang

Meng

et al. 2023

Sustainability

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“…(1978), have played pivotal roles by making noteworthy contributions. Recent research by Deng and colleagues (Deng et al ., 2022a, b, 2023, 2024) has significantly advanced the understanding of rock-cutting processes. Their work involves the study of novel PDC cutters, full-scale mechanical rock-cutting platforms and investigations into cutting forces and temperature fields.…”

Section: Introductionmentioning

confidence: 99%

A study of rotary cutting machine (RCM) performance on Korean granite

Shin,

Farrokh,

Jung

et al. 2024

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PurposeDespite the many advantages this type of equipment offers, there are still some major drawbacks. Linear cutting machine (LCM) cannot accurately simulate the true rock-cutting process as 1. it does not account for the circular path along which tunnel boring machine (TBM) disk cutters cut the tunnel face, 2. it does not accurately model the position of a disk cutter on the cutterhead, 3. it cannot perfectly replicate the rotational speed of a TBM. To enhance the knowledge of these issues and in order to mimic the real rock-cutting process, a new lab testing equipment was developed by Hyundai Engineering and Construction.Design/methodology/approachA new testing machine called rotary cutting machine (RCM) is designed to simulate the excavation process of hard-rock TBMs and includes features such as TBM cutterhead, RPM simulation, constant normal force mode and constant penetration rate mode. Two sets of tests were conducted on Hwandeung granite using different disk cutter sizes to analyze the cutting forces in various excavation modes. The results are analyzed using statistical analysis and dimensional analysis. A new model is generated using dimensional analysis, and its results are compared against the results of actual cases.FindingsThe effectiveness of the new RCM test was demonstrated in its ability to apply various modes of excavation. Initial analysis of chip size revealed that the thickness of the chips is largely dependent on the cutter spacing. Tests with varying RPM showed that an increase in RPM results in an increase in the normal force and rolling force. The cutting coefficient (CC) demonstrated a linear correlation with penetration. The optimal specific energy is achieved at an S/p ratio of around 15. However, a slightly lower S/p ratio can also be used in the design if the cutter specifications permit. A dimensional analysis was utilized to develop a new RCM model based on the results from approximately 1200 tests. The model's applicability was demonstrated through a comparison of TBM penetration data from 26 tunnel projects globally. Results indicated that the predicted penetration rates by the RCM test model were in good agreement with actual rates for the majority of cases. However, further investigation is necessary for softer rock types, which will be conducted in the future using concrete blocks.Originality/valueThe originality of the research lies in the development of Hyundai Engineering and Construction’s advanced full-scale laboratory rotary cutting machine (RCM), which accurately replicates the excavation process of hard-rock tunnel boring machines (TBMs). The study provides valuable insights into cutting forces, chip size, specific energy, RPM and excavation modes, enhancing understanding and decision-making in hard-rock excavation processes. The research also presents a new RCM model validated against TBM penetration data, demonstrating its practical applicability and predictive accuracy.

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“…Mechanical excavation has become the mainstream technology for underground construction, and has been widely applied to river crossings, road tunnels, metro tunnels, mining projects and so on (Deng et al 2022a(Deng et al , 2022b. Cutters, a quiet important part in the excavation machine, contact directly with the rocks.…”

Section: Introductionmentioning

confidence: 99%

Rock abrasiveness prediction based on multi-source physical, mechanical and mineralogical properties

Wu,

Li,

Deng

et al. 2024

Preprint

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Rock abrasiveness is a vital parameter that affects cutter wear, tunneling efficiency, and cost budgeting during mechanical excavation. The Cerchar abrasivity index (CAI), a suggested standard parameter to characterize the rock abrasiveness, can be obtained through the laboratory test. Understanding the correlations between the CAI and physical, mechanical, and mineralogical properties helps to precisely evaluate the cutter wear and improve the excavation efficiency. In this study, 27 groups of rock samples collected from around the country were determined to establish the correlations between the CAI and 17 commonly used rock parameters using simple regression and multiregression. Based on PCC results, the possibility of linear relationships between CAI and 17 rock physical, mechanical, and mineralogical parameters was analyzed for determining the appropriate model. Subsequently, simple linear regression and Boltzmann models were developed based on physical and mechanical parameters, the model based on the porosity showed the excellent forecasting performance over other models. Through the analysis on the coefficient of determination (R2) value, a better multiregression model (R2=0.922) based on the mechanical parameters was obtained, but a more feasible model (R2=0.912) based on the thermal conductivity, diffusion coefficient, elastic modulus, and Rock Abrasivity Index (RAI) was also suggested after consideration of the simplicity and period of parameter measurement. After classification of rock types, the linear correlations strengthened significantly especially for the mineralogical properties, the CAI showed a linear correlation with equivalent quartz content (EQC) and RAI for the granite and sandstone, the quartz content (Q) still showed no relation with CAI.

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Investigations on Cutting Force and Temperature Field of Pick Cutter Based on Single Factor and Orthogonal Test Methods

Cited by 7 publications

References 38 publications

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

A study of rotary cutting machine (RCM) performance on Korean granite

Rock abrasiveness prediction based on multi-source physical, mechanical and mineralogical properties

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