US 11,808,152 B2
Method for real-time strength estimation, grading, and early warning of rock mass in tunnel boring machine (TBM) tunneling
Lijie Du, Shijiazhuang (CN); Qingwei Li, Shijiazhuang (CN); Yalei Yang, Shijiazhuang (CN); Yong Zhao, Shijiazhuang (CN); and Siming Tian, Shijiazhuang (CN)
Assigned to SHIJIAZHUANG TIEDAO UNIVERSITY, Shijiazhuang (CN); and CHINA STATE RAILWAY GROUP CO., LTD., Beijing (CN)
Filed by Shijiazhuang Tiedao University, Shijiazhuang (CN); and China State Railway Group Co., Ltd., Beijing (CN)
Filed on Feb. 2, 2023, as Appl. No. 18/104,831.
Claims priority of application No. 202210138184.2 (CN), filed on Feb. 15, 2022.
Prior Publication US 2023/0258087 A1, Aug. 17, 2023
Int. Cl. E21F 17/18 (2006.01); E21D 9/00 (2006.01); E21D 9/087 (2006.01); G01V 99/00 (2009.01); G06F 30/13 (2020.01); G06F 30/20 (2020.01); G06Q 10/0639 (2023.01); G06F 119/14 (2020.01)
CPC E21F 17/18 (2013.01) [E21D 9/003 (2013.01); E21D 9/087 (2013.01); E21F 17/185 (2013.01); G01V 99/005 (2013.01); G06F 30/13 (2020.01); G06F 30/20 (2020.01); G06Q 10/06393 (2013.01); G06F 2119/14 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A method for real-time strength estimation, grading, and early warning of rock mass in tunnel boring machine (TBM) tunneling, comprising the following steps:
providing a TBM boring construction including a tunnel boring machine that is tunneling in a TBM boring rock mass;
S1: establishing a general relation model of equivalent strength Rec of the TBM boring rock mass and a field penetration index (FPI) as follow:
Rec=64.981n(FPI)−140.32   Formula (1),
wherein a determination coefficient of Formula (1) is R2=0.9146;
S2: applying the model in Formula (1) to TBM boring construction, acquiring boring parameters of the TBM boring construction in real time, calculating the FPI according to the boring parameters, calculating the equivalent strength Rec of the boring rock mass using the model in Formula (1), and estimating an integrity coefficient Kv of the TBM boring rock mass combined with compressive strength of an intact rock mass of the project with same lithology measured by pre-sampling;
S3: performing grading and early warning on the TBM boring rock mass according to a given grading standard and early warning values based on the equivalent strength Rec and the integrity coefficient Kv calculated using the model in Formula (1) in real time; and
S4: identifying a breakage degree of the TBM boring rock mass based on the graded TBM boring rock mass and adjusting the boring parameters and applying a supporting protection to the TBM boring rock mass with a risk of rock mass collapse of the TBM boring construction according to the breakage degree of the TBM boring rock mass.