Controlled Blasting Technology for Connection Passage between Metro Shield Sections in Hard Rock Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective At present, a relatively systematic, mature and rapid excavation construction method for the connection passage construction in hard rock stratum has not been formed yet. Due to the small cross-section and limited operating space in the connection passage, construction with the conventional construction method is less efficient with significant construction risks. Therefore, it is necessary to conduct in-depth study on the technology of controlled blasting in the connection passage of metro shield section in hard rock stratum. Method Taking the connection passage in a shield section of Fuzhou Metro Line 4 as a case study, the controlled blasting technology suitable for this project is proposed. According to the engineering characteristics of the project, the calculating parameters required by the maximum single blast charge for a single-section are set up. In addition, based on the distance between the designed connection passage and the objects to be protected, three levels of maximum single-section charges are calculated, and the schemes for blasting hole design, charge structure design and charge blockage are proposed. Six ground settlement measuring points are selected on the ground above the connection passage, and the settlement curves of the six points during construction are obtained to analyze the influence of blasting on ground settlement. Result & Conclusion The measures of reserving protection layers, treating rock masses as rock walls, shallow hole differential blasting, and digital micro-difference initiation being taken in the process of construction, effectively reduce the explosion impact and blasting vibration, achieving the preset goal of safe blasting and rapid excavation.
Authors and Affiliations
Xinhui FU, Yuanhui YAO, Changtao LIU, Honggang ZHAO, Xiang XIAO, Jianpeng QIN
Keywords
Related Articles
- EP ID EP744334
- DOI 10.16037/j.1007-869x.2024.09.026
- Views 49
- Downloads 0
Gauge Deterioration Prediction of Urban Rail Transit Lines Based on CEEMD and SVR
［Objective］ In order to strengthen the status ma-nagement of urban rail transit line sections, it is necessary to predict the overall deterioration trend of the gauge in space. ［Method］ CEEMD (complementary ensemble...
Impact Analysis of Ground Traffic and Proposed Jinan Metro Line 6 on Nearby Ancient Brick-wood Structure Vibration
［Objective］ The vibration impact of ground traffic on nearby ancient buildings is becoming increasingly prominent. It is necessary to analyze the influence of ground traffic and the proposed Jinan Metro Line 6 on the v...
Overall Overhead Property Development Scheme of Partially Operating Co-site Parking Lot
[Objective] In order to fully utilize the increasingly scarce urban land resources of Suzhou and leverage its geographical advantages, taking Sangtian Island Co-site Parking Lot of Suzhou Rail Transit Line 2 and Line 6 a...
Variable-position System for Balises in Automated Vehicle Depot
Objective The restriction and impact of balises in the maintenance trench of automated vehicle depots on vehicle maintenance grow increasingly prominent. Therefore, it is necessary to conduct a research on the variable-p...
Numerical Study on Shape Discrimination of Land Subsidence Groove during Double-line Shield Construction
Objective The shape of the land subsidence grooves during double-line shield construction varies with the clear distance and buried depth of the tunnel. Thus, it is necessary to conduct an in-depth study on the evolution...