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| 1 | Fast Marching Method for Microseismic Source Location in Cavern-Containing Rockmass: Performance Analysis and Engineering Application显示文摘Microseismic(MS)event locations are vital aspect of MS monitoring technology used to delineate the damage zone inside the surrounding rock mass.However,complex geological conditions can impose significantly adverse effects on the final location results.To achieve a high-accuracy location in a complex cavern-containing structure,this study develops an MS location method using the fast marching method(FMM)with a second-order difference approach(FMM2).Based on the established velocity model with three-dimensional(3D)discrete grids,the realization of the MS location can be achieved by searching the minimum residual between the theoretical and actual first arrival times.Moreover,based on the calculation results of FMM2,the propagation paths from the MS sources to MS sensors can be obtained using the linear interpolation approach and the Runge–Kutta method.These methods were validated through a series of numerical experiments.In addition,our proposed method was applied to locate the recorded blasting and MS events that occurred during the excavation period of the underground caverns at the Houziyan hydropower station.The location results of the blasting activities show that our method can effectively reduce the location error compared with the results based on the uniform velocity model.Furthermore,the obtained MS location was verified through the occurrence of shotcrete fractures and spalling,and the monitoring results of the in-situ multipoint extensometer.Our proposed method can offer a more accurate rock fracture location and facilitate the delineation of damage zones inside the surrounding rock mass. | Ruochen Jiang Feng Dai Yi Liu Ang Li | 2021 | Engineering2021，7，7： | 10 |
| 2 | Investigation of the influence of intermediate principal stress on the dynamic responses of rocks subjected to true triaxial stress state显示文摘Precisely understanding the dynamic mechanical properties and failure modes of rocks subjected to true triaxial stress state(σ1>σ2>σ3,whereσ1,σ2,andσ3 are the major principal stress,intermediate principal stress,and minor principal stress,respectively)is essential to the safety of underground engineering.However,in the laboratory,it is difficult to maintain the constant true triaxial stress state of rocks during the dynamic testing process.Herein,a numerical servo triaxial Hopkinson bar(NSTHB)was developed to study the dynamic responses of rocks confronted with a true triaxial stress state,in which lateral stresses can maintain constant.The results indicate that the dynamic strength and elastic modulus of rocks increase with the rise of intermediate principal stressσ2,while the dynamic elastic modulus is independent of the dynamic strain rate.Simulated acoustic emission distributions indicate that the intermediate principal stressσ2 dramatically affects dynamic failure modes of triaxial confined rocks.Asσ2 increases,the failure pattern switches from a single diagonal shear zone into two parallel shear zones with a small slant.Moreover,a recent triaxial Hopkinson bar experimental system using three bar pairs is also numerically established,and the measuring discrepancies are identified between the two numerical bar systems.The proposed NSTHB system provides a controllable tool for studying the dynamic triaxial behavior of rocks. | Wei You Feng Dai Yi Liu Hongbo Du Ruochen Jiang | 2021 | International Journal of Mining Science and Technology2021，31，5： | 6 |
| 3 | A new perspective of customer perceived value显示文摘 | JIANG Ruochen LIU R R | 2004 | Journal of Customer Behaviour2004，3，2： | 1 |
| 4 | Research Progress of Traditional Chinese Medicine in Treating Dysphagia After Stroke显示文摘Dysphagia is a common complication after stroke,which does not only affect the quality of life of patients,but also increase the risk of death.Traditional Chinese medicine(TCM)treatment has always played an important role in the clinical treatment of dysphagia after stroke,but its mechanism has not been fully elucidated.Literatures on the use of TCM for the disease in the recent 5 years have been reviewed,and the problems existing in the development and treatment of the disease are discussed in this article,in an attempt to provide new ideas for the treatment of the disease.This paper presents a summary of traditional Chinese medicine treatment for the disease in the past five years,including traditional Chinese medicine compound and acupuncture. | Xingxing Shu Sina Feng Liduo Shen Ruochen Jiang Hui Zhang | 2021 | Journal of Clinical and Nursing Research2021，5，6： | 0 |
| 5 | A fracture model for assessing tensile mode crack growth resistance of rocks显示文摘Evaluating the fracture resistance of rocks is essential for predicting and preventing catastrophic failure of cracked structures in rock engineering.This investigation developed a brittle fracture model to predict tensile mode(mode I)failure loads of cracked rocks.The basic principle of the model is to estimate the reference crack corresponding to the fracture process zone(FPZ)based on the maximum normal strain(MNSN)ahead of the crack tip,and then use the effective crack to calculate the fracture toughness.We emphasize that the non-singular stress/strain terms should be considered in the description of the MNSN.In this way,the FPZ,non-singular terms and the biaxial stress state at the crack tip are simul-taneously considered.The principle of the model is explicit and easy to apply.To verify the proposed model,laboratory experiments were performed on a rock material using six groups of specimens.The model predicted the specimen geometry dependence of the measured fracture toughness well.More-over,the potential of the model in analyzing the size effect of apparent fracture toughness was discussed and validated through experimental data reported in the literature.The model was demonstrated su-perior to some commonly used fracture models and is an excellent tool for the safety assessment of cracked rock structures. | Mingdong Wei Feng Dai Yi Liu Ruochen Jiang | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，2： | 0 |
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