Chinese Academy of Sciences

Southwest Jiaotong University

China Railway Eleventh Bureau Group Co., Ltd

China Railway Eleventh Bureau Group Fourth Engineering Co., Ltd.

Wujiu Railway Passenger Dedicated Line Hubei Co., Ltd

China Railway Southwest Scientific Research Institute Co., Ltd

Wuhan University

Anhui China Railway Engineering Technology Service Co., Ltd

China Railway Fourth Bureau Group Co., Ltd

China Railway Seventh Group Co., Ltd.

Jun Gao

Xiao Lin

Liyun Yang

Ming Zhang

Zhengyi Wang

Xiaowei Zuo

Xiaokai Wen

Dan Xu

Feng Wang

Bin Zhou

Kaiwen Liu

Ling Wang

Huiling Xue

Yuxin Gao

Yongtai Wang

Sheng Wang

Min Chen

Ke Chen

Yanfei Pei

Yongguo Qi

Juntao Kang

Yu Tang

Qian Su

Dongsheng Xu

Tenghui Xu

Geng Chen

Linyue Gao

Dean Liu

Songzhen Li

Zhongyi Zhang

Dexing Wu

Junlei Zhou

Pengpeng Ni

Zhiguo Liu

Lingfa Jiang

Chunfeng Meng

Ruizhe Qiu

Xiaobo Xie

Wenguo Yang

Shanxiong Chen

Xuejun Peng

Xingli Li

Hongming Luo

Xiaozhen Xiang

Disclosed are a method and a device for identifying full-section excavation parameters of large-section tunnel with broken surrounding rock, capable of solving the problem of inaccurate arrangement of blasting hole points in tunnel excavation engineering, and including the following steps: establishing a three-dimensional finite element model based on a blasting section design of a tunnel; performing a simulation with the three-dimensional finite element model based on blasting design parameters to obtain blasting quality parameters; selecting a group closest to a preset quality parameter from multiple groups of the blasting design parameters as target blasting design parameters, wherein the preset quality parameter is an acceptance grade standard of the tunnel; obtaining first thermal imaging information of a first hot spot of a surface to be blasted; calibrating actual hole spacing parameters based on the first thermal imaging information and the target blasting design parameters.

Method and device for identifying full-section excavation parameters of large-section tunnel with broken surrounding rock

A reasonable millisecond time control method for excavation blasting of a tunnel is provided, and includes: acquiring physical mechanical parameters to establish a millisecond blasting model, and designing four dimensions blasting parameters of explosive quantity, hole number, inter-hole millisecond and inter-row millisecond; simulating, based on the millisecond blasting model, a blasting process of an explosive package using blasting parameters to obtain a blasting vibration curve; obtaining single-hole blasting vibration waveforms, solving a vibration synthesis curve through a vibration synthesis theory; comparing the vibration synthesis curve with the blasting vibration curve to obtain a coupling relationship of blasting parameters; determining a target group of explosive quantity and hole numbers, determining a target millisecond through the coupling relationship of blasting parameters, and relating a millisecond blasting control strategy to control, and it is used for tunneling project to reduce cut blasting vibration intensity and achieve precise and intelligent control of millisecond blasting.

Reasonable millisecond time control method for excavation blasting of tunnel

A ballastless track roadbed damage forewarning method considering uncertainty includes the following steps. Step: counting roadbed material parameters and precipitation; Step: establishing a FLAC-PFC model of a ballastless track roadbed and calibrating mesoscopic parameters of a roadbed surface layer; Step: generating a lognormal random field of particle contact friction coefficients and assigning it to particle contact nodes of the roadbed surface layer; Step: perform sampling on the precipitation and adjusting a fluid domain of the roadbed surface layer; Step: determining a worst spatial correlation distance in the random field; and Step: calculating a damage probability pf of the roadbed surface layer under the worst spatial correlation distance; outputting alarm information when pf exceeds an alarm threshold, otherwise, quitting. The method monitors and gives early warning of damage to the roadbed surface layer under dynamic loads, ensuring driving safety.

Ballastless track roadbed damage forewarning method and system considering uncertainty

A safe early warning method and device for full-section tunneling of a tunnel featuring dynamic water and weak surrounding rock, comprising establishing a dynamic coordinate system with an origin thereof moving along a tunnel excavation line, recording the moving distance of the origin, conducting three-dimensional laser scanning with the origin as a center to obtain point cloud data including coordinate data, collecting surrounding rock data; conducting deformation fitting on the point cloud data, calculating a fitting residual error, removing a noisy point, and conducting preprocessing; combining data of preprocessed point cloud, surrounding rock, and the tunnel excavation line to construct a tunnel excavation dynamic model; conducting stress analysis according to the model and determining whether to send out a safety early warning signal. The device comprises a three-dimensional laser scanner, a geological radar device, a displacement module, an industrial computer, a data transmission module, an alarm, and a server.

Safety early warning method and device for full-section tunneling of tunnel featuring dynamic water and weak surrounding rock

Growing community of inventors

Wuhan, China

Jun Gao