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| 1 | Estimation of the three-dimensional in situ stress field around a large deep underground cavern group near a valley显示文摘Understanding three-dimensional(3D)in situ stress field is of key importance for estimating the stability of large deep underground cavern groups near valleys.However,the complete 3D in situ stress fields around large deep underground cavern groups are difficult to determine based on in situ stress data from a limited number of measuring points due to the insufficient representativeness and unreliability of such measurements.In this study,an integrated approach for estimating the 3D in situ stress field around a large deep underground cavern group near a valley is developed based on incomplete in situ stress measurements and the stress-induced failures of tunnels excavated prior to the step excavation of the cavern group.This integrated approach is implemented via four interrelated and progressive basic steps,i.e.inference of the regional tectonic stress field direction,analyses of in situ stress characteristics and measurement reliability,regression-based in situ stress field analysis and reliability assessment,and modified in situ stress field analysis and reliability verification.The orientations and magnitudes of the 3D in situ stress field can be analyzed and obtained at a strategic level following these four basic steps.First,the tectonic stress field direction around the cavern group is deduced in accordance with the regional tectonic framework and verified using a regional crustal deformation velocity map.Second,the reliability of the in situ stress measurements is verified based on the locations and depths of stressinduced brittle failures in small tunnels(such as exploratory tunnels and pilot tunnels)within the excavation range of the cavern group.Third,considering the influences of the valley topography and major geological structures,the 3D in situ stress field is regressed using numerical simulation and multiple linear regression techniques based on the in situ stress measurements.Finally,the regressed in situ stress field is further modified and reverified based on the stress-induced brittle failures of small tunnels and the initial excavation of the cavern group.A case study of the Shuangjiangkou underground cavern group demonstrates that the proposed approach is reliable for estimating the 3D in situ stress fields of large deep underground cavern groups near valleys,thus contributing to the optimization of practical excavation and design of mitigating the instability of the surrounding rock masses during step excavations. | Dingping Xu Xiang Huang Quan Jiang Shaojun Li Hong Zheng Shili Qiu Huaisheng Xu Yonghong Li Zhiguo Li Xingdong Ma | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，3： | 6 |
| 2 | A local homogenization approach for simulating the reinforcement effect of the fully grouted bolt in deep underground openings显示文摘Fully grouted bolts are a key component of the support system for underground openings.Although considerable effort has been made in the simulation of the reinforcement effect of the fully grouted bolts on the rock masses surrounding underground openings,most of the work has limited significance since the structural element approach is used.This study proposes a local homogenization approach(L-H approach)that integrates elastoplastic mechanics,composite mechanics,and analytical approaches with numerical simulation to effectively simulate the reinforcement effect of the fully grouted bolt on deep surrounding rock masses.In the L-H approach,the representative volume of bolted rock mass(RVBRM)with a fully grouted bolt is established based on the original mesh model utilized in the rockbolt element approach.The RVBRM is a regular quadrangular prism with a cross-sectional size equal to the bolt spacing and a length equal to the bolt length.The RVBRM is homogenized by the L-H approach from a unidirectional bolt-reinforced composite into a homogeneous transversely isotropic medium whose mechanical properties are described by a new transversely isotropic elastoplastic model.The L-H parameters for the RVBRM are obtained using analytical approaches,composite mechanics,and known parameters of the rock mass and bolt.Using the L-H approach,the reinforcement effect of the fully grouted bolt on the bolted rock specimen and the surrounding rock mass in Jinping II Diversion Tunnel#2 with a depth greater than 2000 m is simulated.The results show that the predictions of the L-H approach are more in agreement with the physical model results of bolted rock specimen and provide a more realistic response of the bolted surrounding rock mass.The L-H approach demonstrates that fully grouted bolts with common bolt spacings and diameters substantially enhance the elastic modulus,shear strength,and tensile strength of the rock mass in the direction of the bolt axis. | Dingping Xu Xiuyang Liu Quan Jiang Shaojun Li Yangyi Zhou Shili Qiu Fei Yan Hong Zheng Xiang Huang | 2022 | International Journal of Mining Science and Technology2022，32，2： | 3 |
| 3 | Thermoelectric response of spin polarization in Rashba spintronic systems显示文摘 | Cong Xiao Dingping Li Zhongshui Ma | 2016 | Frontiers of physics2016，11，3： | 1 |
| 4 | Field theoretical approach to spin models显示文摘We developed a systematic non-perturbative method base on Dyson–Schwinger theory and theΦ-derivable theory for Ising model at broken phase.Based on these methods,we obtain critical temperature and spin spin correlation beyond mean field theory.The spectrum of Green function obtained from our methods become gapless at critical point,so the susceptibility become divergent at Tc.The critical temperature of Ising model obtained from this method is fairly good in comparison with other non-cluster methods.It is straightforward to extend this method to more complicate spin models for example with continue symmetry. | Feng Liu Zhenhao Fan Zhipeng Sun Xuzong Chen Dingping Li | 2021 | Frontiers of physics2021，16，6： | 0 |
| 5 | Chiral universality class of normal-superconducting and exciton condensation transitions on surface of topological insulator显示文摘新二维的系统象拓扑的绝缘体(TI ) 和试验性地调查状况的可能性就一十年以前认为异国情调的 graphene 提议的表面那样。这些状况与一个相对论的系列在电子系统包括 chiral 类型的量阶段转变。调停声子(常规) 在出现在 TI 的表面上的迪拉克半金属配对引起转变进 chiral 在这些无差距的系统的超导的状态,和激子冷凝作用长在狭窄乐队的半导体的物理被想象。以本地吸引力或排斥从显微镜的 Dirac Hamiltonian 开始, Gaussian 近似的 Bardeen-Cooper-Schrieffer 类型在功能的积分的框架被开发。由于一种 ultrarelativistic 分散关系,有量,这被显示出管理零温度的转变到一个超导的状态或激子的批评的点压缩了状态。有批评代表的量转变与常规的极大地不同并且属于 chiral 普遍性班。我们讨论这些结果的应用程序到表面超导性在 TI 在被发现并且估计声子配对的可行性的最近的实验。 | Dingping Li Baruch Rosenstein B. Ya. Shapiro I. Shapiro | 2015 | Frontiers of physics2015，10，3： | 0 |
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