3篇
您的检索式：作者名="Kaiqi Bian"
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| 1 | Experimental study on unloading induced shear performances of 3D saw-tooth rock fractures显示文摘A fractal model governing saw-tooth fractures was first introduced to replicate sandstone samples containing an inclined 3D penetrating rough fracture surface with various joint roughness coefficients(JRC).In conventional triaxial compression,the peak strength for fractured samples increased with both confining pressure and JRC.During the unloading confining pressure process,the normal stress of fractures declined but the shear stress increased,resulting in shear sliding of fractures.The shear displacement of fractures exponentially increased,and the positive normal displacement decreased gradually to negative values under coupling effects of shear contraction caused by normal stress and shear dilation due to climbing effects of fractures.Transition from quasi-static to dynamic sliding of the fractures was identified.The sliding resistance duration increased with confining pressure but decreased with JRC.After prepeak unloading,the fracture surfaces presented a more significant surface wear response and JRC values decreased by 1.70%–59.20%due to more remarkable asperity degradation compared with those after conventional triaxial compression.The theoretical model for shear strength of fractures was established through improving the Ladanyi&Archambault model by introducing the relations between normal stress and surface wear ratios of fractures,which agreed well with the experimental results. | Qian Yin Xinxin Nie Jiangyu Wu Qi Wang Kaiqi Bian Hongwen Jing | 2023 | International Journal of Mining Science and Technology2023，33，4： | 2 |
| 2 | Four organic crystals displaying distinctively different emission colors based on an ESIPT-active organic molecule显示文摘Four crystals A–D based on a structurally simple ESIPT-active molecule 4MPP were obtained by subtly controlling the crystallization conditions. Notably, crystals A and C display single emission bands, which correspond to the keto*(K*) and enol*(E*) emission, respectively. B and D exhibit dual emission with different proportion of E*/K* emissions while D sucessfully achieves white emssion. The distinctively different emission properties of A–D is mainly because of the change in crystal structures. In addition, A displays amplified spontaneous emission, which indicates its potential as single crystal lasers. | Hao Liu Xiao Cheng Zhengyi Bian Kaiqi Ye Hongyu Zhang | 2018 | Chinese Chemical Letters2018，29，10： | 0 |
| 3 | Visualization and early warning analysis of damage degree of surrounding rock mass in underground powerhouse显示文摘Based on the underground powerhouse of Shuangjiangkou hydropower station,Octree theory is adopted to define the indices of the microseismic(MS)spatial aggregation degree and the deviation values of MS count and energy.The relationship between the MS multiple parameters and surrounding rock mass instability is established from three aspects:time,space,and strength.Supplemented by the center frequency of the signal evolution characteristics,A fuzzy comprehensive evaluation model and the evolution trend of the MS event center frequency are constructed to quantitatively describe the early warning state of the surrounding rock mass instability.The results show that the multilevel tree structure and voxels generated based on the Octree theory fit relatively well with the set of MS points in threedimensional space.The fuzzy comprehensive evaluation model based on MS spatial aggregation and MS count and energy deviation values enables three-dimensional visualization of the potential damage area and damage extent of the surrounding rock mass.The warning time and potential damage zone quantified are highly consistent with the characteristics of MS precursors,with wide recognition and field investigation results,which fully validate the rationality and applicability of the proposed method.These findings can provide references for the early warning of surrounding rock mass instability in similar underground engineering. | Yuepeng Sun Haijian Su Peiwei Xiao Peng Li Biao Li Xiang Zhou Kaiqi Bian Nuwen Xu | 2023 | International Journal of Mining Science and Technology2023，33，6： | 0 |
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