Optimization Methods of Blasting Parameters of Large Cross-Section Tunnel in Horizontal Layered Rock Mass

Mei, Jie; Zhang, Wanzhi; Xu, Bin; Zhu, Yongxue; Wang, Bingkun

doi:10.1007/s10706-021-01834-8

Cited by 19 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the basis of model tests and field investigation, Chakraborty et al [11,12] evaluated the joint direction and rock mass quality affecting tunnel overbreak and considered that blasting quality was related to the average rock mass size, depth, and geometric dimensions of the cross-sectional profile. Mei et al [13] used the horizontal layered rock mass large-section tunnel as the research object and proposed the cutting methods of "center holes and four-wedge cutting holes", "empty holes, long holes, short holes, and additional relief holes", and the fine excavation mode of the maximum single hole charging scheme. Meng et al [14] improved smooth blasting parameters and construction technology in large dip tunnels in accordance with the actual construction situation on site, the rock, and the explosive properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rock Mass Structure Effect on Tunnel Smooth Blasting Quality: A Case Study

et al. 2021

View full text Add to dashboard Cite

Taking the Zigaojian tunnel, Hangzhou–Huangshan high-speed railway, China, as background, the rock mass structure effect on smooth blasting quality was studied. Four rock mass structures were determined on the basis of the information collected on the tunnel site. Smooth blasting finite element models were established using LS-DYNA. The accuracy of the numerical calculation model was verified by comparing the overbreak and underbreak between the numerical simulation and monitoring. Orthogonal numerical test was used to study the rock mass structure effect through single factor and main effect analysis methods. With the decrease in rock mass integrity, the smooth blasting overbreak of tunnels with massive integrity structure, massive structure, layered structure, and cataclastic structure increased. For massive integrity structure and cataclastic structure, the peripheral hole spacing should be emphatically considered. Meanwhile, in massive structure and layered structure, the included angle and spacing of structural planes had a great influence on the smooth blasting quality. The research results could provide a reference to improve the quality of similar tunnel smooth blasting.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rock Mass Structure Effect on Tunnel Smooth Blasting Quality: A Case Study

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The over-and underbreaks can be brought about by two main reasons: by the drilland-blast design and execution and by the geomechanical features of the rock mass [15]. Thus, many scientists in their research have raised the problem of drilling and blasting parameter selection to ensure the predefined shape of excavation [16][17][18].…”

Section: State Of the Artmentioning

confidence: 99%

A Method for Large Underground Structures Geometry Evaluation Based on Multivariate Parameterization and Multidimensional Analysis of Point Cloud Data

et al. 2022

View full text Add to dashboard Cite

In underground mining, new workings (tunnels) are constructed by blasting or mechanical excavation. The blasting technique used in underground mines is supported by economic aspects, especially for deposits characterized by hard rocks. Unfortunately, the quality of the result may be different than expected in terms of the general geometry of work or the roughness of excavation surfaces. The blasting technique is also a source of vibrations that may affect other existing structures, affecting their stability. Therefore, it is of great importance to monitor both the quality of the new tunnels and changes in existing tunnels that may cause rockfall from the sidewalls and ceilings of both new and existing tunnels. The length of mining tunnels and support structures in underground mines is massive. Even if one would like to limit monitoring of tunnel geometry to those used every day for major technological processes such as transport, it is a vast amount of work. What is more, any stationary monitoring system is hard to utilize both due to everyday blasting procedures and mobile machine operation. The method proposed here is based on quick LiDAR/Terrestrial Laser Scanner measurements to obtain a cloud of points, which allows generating the spatial model of a mine’s geometry. Data processing procedures are proposed to extract several parameters describing the geometry of the tunnels. Firstly, the model is re-sampled to obtain its uniform structure. Next, a segmentation technique is applied to separate the cross sections with a specific resolution. Statistical parameters are selected to describe each cross section for final 1D feature analysis along the tunnel length. Such a set of parameters may serve as a basis for blasting evaluation, as well as long-term deformation monitoring. The methodology was tested and validated for the data obtained in a former gold and arsenic mine Zloty Stok, Poland.

show abstract

“…Ji et al (2020) proposed an inverted T-shaped hollowing and blasting method for very large cross-section tunnels, which improved the blasting effect. Mei et al (2021) carried out studies on hollowing methods, blast hole placement, charge volume, and charge structure to achieve safe and efficient blasting excavation. Zhang et al (2022) proposed an innovative hollowing and blasting technique based on cavity hollowing and debris throwing.…”

Section: Introductionmentioning

confidence: 99%

Research on the theory and method of reduced-hole blasting for large cross-section tunnel based on explosive energy dissipation

Tian,

Tao,

Xie

2024

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

The traditional tunnel drilling and blasting method places cut holes at the lower center of the excavation face, resulting in an excessive number of blasting holes. With the continuous increase in cross-section area, this design concept can no longer meet the requirements of safe and efficient tunnel boring for large cross-section tunnels. This paper puts forward the theory and method of reduced-hole blasting for large cross-section tunnels, as an alternative to the traditional drilling and blasting method of the “more holes, less charge” design concept. Based on the explosion energy dissipation law and rock’s critical crushing energy dissipation characteristics, the calculation method of the extrapolation distance of the wedge-cut holes is given. The optimum extrapolation distance of the wedge-cut holes was verified using numerical simulation and field tests. The results show that the number of drilling holes can be reduced by about 15.8% using the theory and method proposed in this paper, and at the same time, the damage of retained rock can be effectively controlled. The results of this study can provide a reference for the design of blast network parameters for similar large cross-section tunnels.

show abstract

Optimization Methods of Blasting Parameters of Large Cross-Section Tunnel in Horizontal Layered Rock Mass

Cited by 19 publications

References 21 publications

Numerical Simulation of Rock Mass Structure Effect on Tunnel Smooth Blasting Quality: A Case Study

Numerical Simulation of Rock Mass Structure Effect on Tunnel Smooth Blasting Quality: A Case Study

A Method for Large Underground Structures Geometry Evaluation Based on Multivariate Parameterization and Multidimensional Analysis of Point Cloud Data

Research on the theory and method of reduced-hole blasting for large cross-section tunnel based on explosive energy dissipation

Contact Info

Product

Resources

About