Southwest Jiaotong University

Chinese Academy of Sciences

Wuhan 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

China Railway Seventh Group Co., Ltd.

Kaiwen Liu

Jun Gao

Xiao Lin

Ming Zhang

Ke Chen

Zhengyi Wang

Xiaowei Zuo

Feng Wang

Yongtai Wang

Bin Zhou

Ling Wang

Xiaokai Wen

Dan Xu

Huiling Xue

Yuxin Gao

Ruizhe Qiu

Zhongyi Zhang

Yongguo Qi

Junlei Zhou

Yanfei Pei

Juntao Kang

Zhiguo Liu

Dongsheng Xu

Chunfeng Meng

Pengpeng Ni

Tenghui Xu

Geng Chen

Qian Su

Linyue Gao

Songzhen Li

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 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

Growing community of inventors

Chengdu, China

Kaiwen Liu