Differentiation and analysis on rock breaking characteristics of TBM disc cutter at different rock temperatures

Published on Dec 16, 2015in Journal of Central South University1.716
路 DOI :10.1007/S11771-015-3032-6
Qing Tan3
Estimated H-index: 3
(CSU: Central South University),
Gui-ju Zhang1
Estimated H-index: 1
(CSU: Central South University)
+ 1 AuthorsJian-fang Li1
Estimated H-index: 1
(CSU: Central South University)
Source
Abstract
In order to study rock breaking characteristics of tunnel boring machine (TBM) disc cutter at different rock temperatures, thermodynamic rock breaking mathematical model of TBM disc cutter was established on the basis of rock temperature change by using particle flow code theory and the influence law of interaction mechanism between disc cutter and rock was also numerically simulated. Furthermore, by using the linear cutting experiment platform, rock breaking process of TBM disc cutter at different rock temperatures was well verified by the experiments. Finally, rock breaking characteristics of TBM disc cutter were differentiated and analyzed from microscale perspective. The results indicate the follows. 1) When rock temperature increases, the mechanical properties of rock such as hardness, and strength, were greatly reduced, simultaneously the microcracks rapidly grow with the cracks number increasing, which leads to rock breaking load decreasing and improves rock breaking efficiency for TBM disc cutter. 2) The higher the rock temperature, the lower the rock internal stress. The stress distribution rules coincide with the Buzin Neske stress circle rules: the maximum stress value is below the cutting edge region and then gradually decreases radiant around; stress distribution is symmetrical and the total stress of rock becomes smaller. 3) The higher the rock temperature is, the more the numbers of micro, tensile and shear cracks produced are by rock as well as the easier the rock intrusion, along with shear failure mode mainly showing. 4) With rock temperature increasing, the resistance intrusive coefficients of rock and intrusion power decrease obviously, so the specific energy consumption that TBM disc cutter achieves leaping broken also decreases subsequently. 5) The acoustic emission frequency remarkably increases along with the temperature increasing, which improves the rock breaking efficiency.
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References17
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#1Hong-yan Zuo (CSU: Central South University)H-Index: 4
#2Zhou-quan Luo (CSU: Central South University)H-Index: 3
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A single freedom degree model of drilling bit-rock was established according to the vibration mechanism and its dynamic characteristics. Moreover, a novel identification method of rock and soil parameters for vibration drilling based on the fuzzy least squares (FLS)-support vector machine (SVM) was developed, in which the fuzzy membership function was set by using linear distance, and its parameters, such as penalty factor and kernel parameter, were optimized by using adaptive genetic algorithm....
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#3Peng Wang (USST: University of Shanghai for Science and Technology)H-Index: 122
The mechanical properties of heated granite subjected to two different cooling ways, namely cooled in the water (fast-cooling) and cooled in the air (slow-cooling) at room temperature, were studied respectively. The effects of the heating temperatures and cooling ways on the failure mode and failure mechanism of heated granite were analyzed. The tested results indicated that the longitudinal wave velocity, uni-axial compressive strength, and initial elastic modulus of heated granite decreased wi...
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Experiments on granite under uniaxial compression at high temperature of 25~850掳C and after high temperature of 25~1300掳C were conducted to study the effect of temperature on rock strength and deformation quality. The results show that: (1) Fitting curves between temperature strain and thermal expansion coefficient with temperature are closely first order growth exponential function relation at high temperature. Temperature strain has mutagenicity after high temperature, which can not reflect ro...
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#1Lihui Wang (TJU: Tianjin University)H-Index: 4
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Abstract Prediction of disc cutter wear extent is a critical factor for improving the working performance of tunnel boring machines (TBMs). In this study, three TBM working performance parameters are demonstrated to be directly influenced by disc cutter wear and selected as factors that predict disc cutter wear extent; new equations that describe the specific energy (SE) requirement of all disc cutters on the cutterhead are developed, and the SE rule is revealed based on mechanical analysis of t...
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#1Jung-Woo Cho (SNU: Seoul National University)H-Index: 10
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A series of numerical experiments was performed to simulate rock fragmentation by TBM disc cutter. We used AUTODYN-3D to simulate three-dimensional dynamic failure observed in linear cutting machine (LCM) tests. By acquiring the mean rolling force and the mass of rock debris during the numerical test, we were able to calculate the specific energy which is defined as energy required to cut through a unit volume of rock. Before performing the main simulations to determine the optimum cutter spacin...
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Disc cutter is the key part in Tunnel Boring Machine (TBM). Wear and tear of disc cutter is the main reason of low efficiency and high cost of this machine. Forces and deformations of disc cutter ring are foundation for its design and assembly. In this paper, the analysis of stress and deformation are carried to study their distribution; Wear mechanism of disc cutter ring is presented; modal analysis is carried to study the vibration of disc cutter ring. The results show the yield strength and r...
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Dec 16, 2009 in ICIRA (International Conference on Intelligent Robotics and Applications)
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Cutter head is one of the most important components for the full-face rock tunnel boring machine (TBM), in which the layout design of the disc cutters is a key issue. Considering the complex engineering technical requirements, this paper studied an ant colony optimization (ACO) algorithm to solve the disc cutters plane layout problem. The searching space of the design variables (disc cutters' position) were dispersed by setting several different search steps, then an ACO algorithm was adopted to...
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#1Hongyuan Liu (USYD: University of Sydney)H-Index: 29
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The rock fragmentation process induced by a single button-bit, two neighboring button-bits, and multiple button-bits are numerically studied using the rock and tool interaction code (R- T2D ) . Through this study, a better understanding of the bit-rock fragmentation mechanisms is gained. It is found that side crack is initiated from the crushed zone or bifurcated from Hertzian crack to propagate approximately parallel to the free rock surface but in a curvilinear path driven by the tensile stres...
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#1Richard E. Gertsch (MTU: Michigan Technological University)H-Index: 6
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A series of full-scale laboratory disc cutting tests was conducted with a single disc cutter (432 mm diameter and a constant cross-section profile) and a single rock type (a coarse-grained red granite). Normal, rolling, and side forces were measured for a series of spacings and penetrations, from which other cutting parameters also were calculated. Although the increases of normal and rolling forces with increased spacing and penetration are as expected, the results illuminate additional aspects...
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#1Qiuming Gong (NTU: Nanyang Technological University)H-Index: 23
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TBM performance depends on the rock breakage efficiency induced by TBM cutterhead. The rock breakage process is the interaction process between TBM and rock mass, which is affected by the TBM specifications, such as cutter thrust force, cutter tip width and profile, cutter spacing, revolution per minute, and torque, and rock mass properties mainly including rock material strength, rock brittleness index, joint spacing and orientation. In this study, rock chipping process induced by two TBM cutte...
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