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| 1 | Rock brittleness indices and their applications to different fields of rock engineering:A review显示文摘Brittleness is an important parameter controlling the mechanical behavior and failure characteristics of rocks under loading and unloading conditions,such as fracability,cutability,drillability and rockburst proneness.As such,it is of high practical value to correctly evaluate rock brittleness.However,the definition and measurement method of rock brittleness have been very diverse and not yet been standardized.In this paper,the definitions of rock brittleness are firstly reviewed,and several representative definitions of rock brittleness are identified and briefly discussed.The development and role of rock brittleness in different fields of rock engineering are also studied.Eighty brittleness indices publicly available in rock mechanics literature are compiled,and the measurement method,applicability and limitations of some indices are discussed.The results show that(1)the large number of brittleness indices and brittleness definitions is attributed to the different foci on the rock behavior when it breaks;(2)indices developed in one field usually are not directly applicable to other fields;and(3)the term“brittleness”is sometimes misused,and many empirically-obtained brittleness indices,which lack theoretical basis,fail to truly reflect rock brittleness.On the basis of this review,three measurement methods are identified,i.e.(1)elastic deformation before fracture,(2)shape of post-peak stressestrain curves,and(3)methods based on fracture mechanics theory,which have the potential to be further refined and unified to become the standard measurement methods of rock brittleness.It is highly beneficial for the rock mechanics community to develop a robust definition of rock brittleness.This study will undoubtedly provide a comprehensive timely reference for selecting an appropriate brittleness index for their applications,and will also pave the way for the development of a standard definition and measurement method of rock brittleness in the long term. | Fanzhen Meng Louis Ngai Yuen Wong Hui Zhou | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，1： | 8 |
| 2 | POWER FLOW ANALYSIS AND APPLICATION SIMULATION OF ELECTROMAGNETIC CONTINUOUSLY VARIABLE TRANSMISSION显示文摘With the structure of two air gaps and two rotors,the electromagnetic continuously variable transmission(EMCVT) is a novel power-split continuously variable transmission(CVT).There are two kinds of power flowing through the EMCVT,one is mechanical power and the other is electric power. In the mean time,there are three power ports in the EMCVT,one is the outer rotor named mechanical power port and the other two are the inner rotor and the stator named electric power ports.The mechanical power port is connected to the driving wheels through the fmal gear and the electric ports are connected to the batteries through the transducers.The two kinds of power are coupled on the outer rotor of the EMCVT.The EMCVT can be equipped on the conventional vehicle being regarded as the CVT and it also can be equipped on the hybrid electric vehicle(HEV) as the multi-energy sources assembly.The power flows of these two kinds of applications are analysed.The back electromotive force(EMF) equations are illatively studied and so the dynamic mathematic model is theorized.In order to certify the feasibility of the above theories,three simulations are carried out in allusion to the above two kinds of mentioned applications of the EMCVT and a five speed automatic transmission(AT) vehicle.The simulation results illustrate that the efficiency of the EMCVT vehicles is higher than that of the AT vehicle owed to the optimized operation area of the engine.Hence the fuel consumption of the EMCVT vehicles is knock-down. | LUO Yutao TAN Di MENG Fanzhen | 2008 | Chinese Journal of Mechanical Engineering2008，21，6： | 3 |
| 3 | Cognitive decline following major surgery is associated with gliosis, β-amyloid accumulation, and τ phosphorylation in old mice显示文摘 | Yanjie Wan Jing Xu Fanzhen Meng Yuhua Bao Yeying Ge Niyati Lobo Marcela P. Vizcaychipi Denghai Zhang Steve M. Gentleman Mervyn Maze Daqing Ma | 2010 | Critical Care Medicine2010，，11： | 1 |
| 4 | Secret sharing scheme with inherited characteristic显示文摘To assure the shareholders can look for their “legal” attorneys to renew the secret, once the secret sharing scheme is initialized, a secret sharing scheme with inherited characteristic is constructed. In this scheme, each shareholder can produce a new share by his algorithm, which is equivalent to the primary one. Together with other shares, the primary secret can be renewed. Since this scheme is constructed not by replacing the primary share with a new share produced by the dealer in his primitive secret sharing scheme, so no matter how much shares the shareholder produces, these shares can not be gathered together to renew the secret in this scheme. Compared with the existing secret sharing schemes, this scheme provides more agility for the shareholders by investing each of them a function but not affect its security. | Ye Zhenjun Meng Fanzhen | 2006 | Journal of Systems Engineering and Electronics2006，17，4： | 1 |
| 5 | Chaotic Video Encryption Algorithm Based on Baker Map显示文摘 | Meng Z Fanzhen W LIUZhong-xin S U N | 2011 | Journal of Image and Graphics2011，9，11： | 1 |
| 6 | Cognitive decline following major surgery is associated with gliosis, β-amyloid accumulation, and τ phosphorylation in old mice显示文摘 | Yanjie Wan Jing Xu Fanzhen Meng Yuhua Bao Yeying Ge Niyati Lobo Marcela P. Vizcaychipi Denghai Zhang Steve M. Gentleman Mervyn Maze Daqing Ma | 2010 | Critical Care Medicine2010，，11： | 1 |
| 7 | The Application of Spanning Tree Algorithm in Arabic Language Rules for Contextual Analysis | BIAN Fuping MENG Fanzhen HOU Wenhua(Department of Mathematics, Tianjin University, Tianjin 300072) | 1996 | Systems Science and Systems Engineering1996，6，4： | 0 |
| 8 | Design and realization of threshold secret sharing scheme with random weights显示文摘A new threshold secret sharing scheme is constructed by introducing the concept of share vector, in which the number of shareholders can be adjusted by randomly changing the weights of them.This kind of scheme overcomes the limitation of the static weighted secret sharing schemes that cannot change the weights in the process of carrying out and the deficiency of low efficiency of the ordinary dynamic weighted sharing schemes for its resending process.Thus,this scheme is more suitable to the case that the number of shareholders needs to be changed randomly during the scheme is carrying out. | Ye Zhenjun Fang Zhenming Wang Chunfeng Meng Fanzhen | 2009 | Journal of Systems Engineering and Electronics2009，20，5： | 0 |
| 9 | Shear behavior and off-fault damage of saw-cut smooth and tension-induced rough joints in granite显示文摘The damage of rock joints or fractures upon shear includes the surface damage occurring at the contact asperities and the damage beneath the shear surface within the host rock.The latter is commonly known as off-fault damage and has been much less investigated than the surface damage.The main contribution of this study is to compare the results of direct shear tests conducted on saw-cut planar joints and tension-induced rough granite joints under normal stresses ranging from 1 MPa to 50 MPa.The shear-induced off-fault damages are quantified and compared with the optical microscope observation.Our results clearly show that the planar joints slip stably under all the normal stresses except under 50 MPa,where some local fractures and regular stick-slip occur towards the end of the test.Both post-peak stress drop and stick-slip occur for all the rough joints.The residual shear strength envelopes for the rough joints and the peak shear strength envelope for the planar joints almost overlap.The root mean square(RMS)of asperity height for the rough joints decreases while it increases for the planar joint after shear,and a larger normal stress usually leads to a more significant decrease or increase in RMS.Besides,the extent of off-fault damage(or damage zone)increases with normal stress for both planar and rough joints,and it is restricted to a very thin layer with limited micro-cracks beneath the planar joint surface.In comparison,the thickness of the damage zone for the rough joints is about an order of magnitude larger than that of the planar joints,and the coalesced micro-cracks are generally inclined to the shear direction with acute angles.The findings obtained in this study contribute to a better understanding on the frictional behavior and damage characteristics of rock joints or fractures with different roughness. | Fanzhen Meng Feili Wang Louis Ngai Yuen Wong Jie Song Muzi Li Chuanqing Zhang Liming Zhang | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，4： | 0 |
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