scholarly journals Intelligent Classification Model of Surrounding Rock of Tunnel using Drilling and Blasting Method

2020 ◽  
Author(s):  
Mingnian Wang ◽  
Siguang Zhao ◽  
Jianjun Tong ◽  
Zhilong Wang ◽  
Meng Yao ◽  
...  
Keyword(s):  
Surrounding Rock ◽  
Classification Model ◽  
Blasting Method

scholarly journals Comparative Study of the Excavation Damage and Rockburst of the Deeply Buried Jinping II Diversion Tunnels Using a TBM and the Drilling-Blasting Method

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Jing Yang ◽  
Xing-Guo Yang ◽  
Jia-Wen Zhou ◽  
Yong Liu ◽  
Bao-Shun Dong ◽  
...  
Keyword(s):  
Rock Mass ◽  
Stress Concentration ◽  
High Stress ◽  
Tunnel Boring Machine ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
High In Situ Stress ◽  
Damaged Zone ◽  
Blasting Method

The rock mass failure induced by high in-situ stresses during the excavation of deep diversion tunnels is one of the key problems in the construction of the Jinping II Hydropower Station. Based on the results of acoustic wave tests and rockburst statistical analysis conducted, this study focuses on the excavation damaged zone (EDZ) and rockburst events in the Jinping II diversion tunnels excavated using the tunnel boring machine (TBM) method and the drilling-blasting method. The unloading failure mechanism and the rockburst induced by the two different excavation methods were compared and analyzed. The results indicate that, due to the different stress adjustment processes, the degree of damage to the surrounding rock mass excavated using the drilling-blasting method was more serious than that using the TBM method. The EDZ induced by the TBM was usually distributed evenly along the edge of the excavation surface. While, the drilling-blasting method was more likely to cause stress concentration, resulting in a deeper EDZ in local areas. However, the TBM excavation method can cause other problems in high in-situ stress areas, such as strong rockbursts. The drilling-blasting method is more prone to structural controlled failure of the surrounding rock mass, while the TBM method would induce high stress concentration near the edge of excavation and more widely distributed of stress adjustment induced failure. As a result, the scale and frequency of the rockburst events generated by the TBM were significantly greater than those caused by the drilling-blasting method during the excavation of Jinping II diversion tunnels. The TBM method should be used carefully for tunnel excavation in high in-situ stress areas with burial depths of greater than 2000 m. If it is necessary to use the TBM method after a comprehensive selection, it is suggested that equipment adaptability improvement, advanced prediction, and prediction technology be used.

Intelligent rating method of tunnel surrounding rock based on one-dimensional convolutional neural network

2021 ◽  
pp. 1-19
Author(s):  
Gang Yang ◽  
Tianbin Li ◽  
Chunchi Ma ◽  
Lubo Meng ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Sampling Error ◽  
Structural Data ◽  
Surrounding Rock ◽  
Classification Model ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Rock Classification ◽  
One Dimensional ◽  
Rating Method ◽  
Encoding Method

Accurate prediction of surrounding rock grades holds great significance to tunnel construction. This paper proposed an intelligent classification method for surrounding rocks based on one-dimensional convolutional neural networks (1D CNNs). Six indicators collected in some tunnel construction sites are considered, and the degree of linear correlation between these indicators has been analyzed. The improved one-hot encoding method is put forward for transforming these non-image indicators into one-dimensional structural data and avoiding the sampling error in the indicators of surrounding rock collected in the field. We found that the 1D CNNs model based on the improved one-hot encoding method can best extract the features of surrounding rock classification indicators (in terms of both accuracy and efficiency). We applied the well-trained classification model of tunnel surrounding rock to a series of expressway tunnels in China, and the results show that our model could accurately predict the surrounding rock grade and has great application value in the construction of tunnel engineering. It provides a new research idea for the prediction of surrounding rock grades in tunnel engineering.

Stability Analysis of Surrounding Rock Based on QGA-SVM

2014 ◽  
Vol 1065-1069 ◽  
pp. 199-203
Author(s):  
Fu Dong Xie ◽  
Wei Min Yang ◽  
Dao Hong Qiu ◽  
Yi Li
Keyword(s):  
Stability Analysis ◽  
Solution Space ◽  
Surrounding Rock ◽  
Classification Model ◽  
Support Vector ◽  
Rock Classification ◽  
Quantum Genetic Algorithm ◽  
Stability Of Surrounding Rock ◽  
Practical Engineering ◽  
The Stability

In order to analyze the stability of surrounding rock accurately and effectively, a rock classification method based on QGA (quantum genetic algorithm)-SVM (support vector machine) is put forward. QGA was used for global search in the solution space to optimize the kernel function parameters of SVM. And this method improved the classification accuracy of SVM in rock classification. Finally, a rock classification model based on QGA-SVM was established and applied to practical engineering. The result shows that the improved SVM has a higher accuracy in stability analysis of surrounding rock.

scholarly journals Mechanical response of surrounding rock of tunnels constructed with the TBM and drill-blasting method

2012 ◽  
Vol 66 (2) ◽  
pp. 545-556 ◽  
Author(s):  
Feng Ji ◽  
Junfu Lu ◽  
Yuchuan Shi ◽  
Chunhong Zhou
Keyword(s):  
Mechanical Response ◽  
Surrounding Rock ◽  
Blasting Method

Analysis on the Characteristics of Displacement Field Distribution around the Deep Buried and Great Complex Section Tunnel

2012 ◽  
Vol 446-449 ◽  
pp. 2251-2255 ◽  
Author(s):  
Sheng Xiang Lei ◽  
Bo Gao ◽  
Qing Hua Xiao
Keyword(s):  
Retaining Wall ◽  
Maximum Principal Stress ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Hydropower Station ◽  
Spring Back ◽  
Rock Stress ◽  
Large Section ◽  
Blasting Method ◽  
Underground Chamber

Taken the excavation of TBM assembly underground chamber with deeply buried super large and complex section in Jinping Ⅱ Hydropower Station as the background, apply theoretical analysis and experimental method to study the rock deformation and displacement analysis. The result shows that, drilling and blasting method is used for construction which is divided into four layers from top to bottom according to the excavation, they are 8.5m, 5.5m, 6.0m,7.0m from top to bottom, respectively. the displacement of surrounding rock generally moves toward the direction of the free surface. The rock possesses spring back deformation pointing to internal underground chamber. The displacements of arch crown and floor are mainly vertical, and displacement of retaining wall is mainly horizontal. This is significantly different from the rock deformation of underground chamber under general stress after excavation. The chamber displacement distribution under high crustal stress is closely related to stress direction. Location axis of underground chamber should parallel the direction of maximum principal stress. Under the complex and great deeply buried condition, excavation of large section tunnel by digging from the top layer can better release the rock stress, and the rock displacement changes gently, which is conducive to rock mass stability and structure security.

Classification model for surrounding rock based on the PCA-ideal point method: an engineering application

2018 ◽  
Vol 78 (5) ◽  
pp. 3627-3635 ◽  
Author(s):  
Yiguo Xue ◽  
Zhiqiang Li ◽  
Daohong Qiu ◽  
Lewen Zhang ◽  
Ying Zhao ◽  
...  
Keyword(s):  
Ideal Point ◽  
Engineering Application ◽  
Surrounding Rock ◽  
Point Method ◽  
Classification Model

Study of Tunnel Surrounding Rock Classification Based on Drifting Degree and Uncertainty Measurement

2013 ◽  
Vol 353-356 ◽  
pp. 1427-1432
Author(s):  
Lan Hu ◽  
Tao Li ◽  
Wen Ge Qiu
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Measurement Theory ◽  
Surrounding Rock ◽  
Classification Model ◽  
Rock Classification ◽  
Evaluation Standard ◽  
Uncertainty Measurement ◽  
Practical Engineering ◽  
Contrast Analysis

Based on contrast analysis of tunnel surrounding rock classification method, five basic indicators were selected as evaluation factors. Evaluation matrix was constructed by uncertainty measurement theory. Weight was established by introducing drifting degree concept. The principle of maximum membership degree was choosed as evaluation criterion.Then a tunnel surrounding rock classification model was built.This comprehensive evaluation method made full use of its own parameters and evaluation standard to completely avoid the subjective influence of traditional weights determination and the sample set, making itself more objectivity and accuracy, having a strong operability. The practical engineering showed that this model applied to tunnel surrounding rock classification was feasible and had certain superiority, providing a new way for tunnel surrounding rock classification.

Effect of Blasting on the Adjacent Underground Tunnels

2011 ◽  
Vol 90-93 ◽  
pp. 1870-1878 ◽  
Author(s):  
Zu Song Wu ◽  
Guang Qi Chen ◽  
Kouki Zen ◽  
Kiyonobu Kasama ◽  
Dao Liang Wang
Keyword(s):  
Numerical Simulation ◽  
Underground Structure ◽  
Surrounding Rock ◽  
Tunnel Structure ◽  
Underground Structures ◽  
Economical Method ◽  
Explosive Energy ◽  
Finite Element Software ◽  
Severe Effect ◽  
Blasting Method

The blasting method is regarded as a simple, convenient and economical method for constructing the underground structure, so it is advisable method for many underground structures to construct. But the investigation of the effect of the blasting dynamic load on the vicinal tunnel structure is rare, and the effect of blasting on the vicinal structures cannot be ignored either; sometimes, the effect will cause crack and even collapse in the tunnel liner and surrounding rock. So this paper presented the effect of blasting on the vicinal underground structure in differential cases using the finite element software Midas GTS. The investigation in this paper indicated which case will suffer the more severe effect caused by blast and let us know the vibration principle of the underground structure in differential case, and that will provide the knowledge about the vibration caused by blasting to the design and construction by numerical simulation; additionally, this paper has presented the reinforcement method about inserting the bolt into the surrounding rock to analyze how to resist the effect of the blast load. So from this analysis, it can be noted that the blasting method or the explosive energy will be chosen on the basis of different construction shape, and the reasonable location of the bolt will be adopted in order to reduce the effect of the dynamic on the vicinal tunnel structure.

scholarly journals Research on Construction Control Technology of Large-Span and Small Clear Distance Underpass High-Voltage Line Tunnel

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Kun Wang ◽  
Lushi Wang ◽  
Daoliang Wang
Keyword(s):  
High Voltage ◽  
Large Scale ◽  
Surrounding Rock ◽  
Element Analysis ◽  
Partition Wall ◽  
Clear Distance ◽  
Quantity Control ◽  
Smooth Blasting ◽  
The Impact ◽  
Blasting Method

Hanping tunnel is a control project of national highway 310 Dahejia to Qingshui highway project. It needs to cross a 330kV high-voltage transmission line under the condition of small clear distance, which requires high construction requirements. In view of the difficulties such as shallow buried depth of tunnel and small clear distance between tunnel and tower of high-voltage line, multiple excavation blasting method is adopted, and smooth blasting, charge quantity control and damping hole setting are comprehensively used to reduce the impact on the tower and structure of high-voltage line. In order to ensure the smooth progress of the project, the large-scale finite element analysis software is used to simulate the whole excavation project. The influence of the full-section method and the middle partition wall method (CD method) on the surrounding rock and the high-voltage electric tower is compared. It is found that the CD method can effectively control the displacement of the surrounding rock and the tower on it and the uneven settlement.

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