Numerical Analysis of Soft Surrounding Rock Deformation in Freezing Shaft Sinking based on Temperature Partition

2021 ◽  
Author(s):  
Yue Qin ◽  
Lei Wang ◽  
Hongming Su
Keyword(s):  
Numerical Analysis ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Shaft Sinking ◽  
Surrounding Rock Deformation

Numerical Analysis of Deformation Influence of Horizontal Adit Construction on Main Tunnel Intersection Structure

2012 ◽  
Vol 204-208 ◽  
pp. 1514-1517
Author(s):  
Zhi Jie Sun
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Stress Concentration ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
3D Finite Element ◽  
Arching Effect ◽  
Highway Tunnel ◽  
Element Simulation ◽  
Surrounding Rock Deformation

The 3D finite element simulation are adopted to study the surrounding rock deformation regularity of main tunnel during the horizontal adit construction stage．The Zhongtiaoshan highway tunnel is taken as an example. The research results are shown as follows：Horizontal adit excavation destroys the original arching effect of the main tunnel, which leads to stress concentration at the intersection of primary supporting structure. The first excavation step plays an important play in the surrounding rock deformation of the intersection. The influence range of the main tunnel which due to the horizontal adit excavation is 1.2D.

Surrounding Rock Consolidation Numerical Analysis of Unsymmetrical Loading Tunnel

2012 ◽  
Vol 170-173 ◽  
pp. 1685-1689
Author(s):  
Xiu Zhu Yang ◽  
Jin Shan Lei ◽  
Ye Hui Ning
Keyword(s):  
Numerical Analysis ◽  
Shear Strain ◽  
Vertical Displacement ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Jet Grouting ◽  
Unsymmetrical Loading ◽  
Shallow Buried Tunnel ◽  
Surrounding Rock Deformation

Jet grouting piles were used to reinforce overlying soil of shallow buried tunnel under unsymmetrical pressure. Displacement and strain was simulated during tunnelling with three steps excavation method under condition of reinforcement and unreinforcement. The results show that larger vertical displacement and shear strain occur during excavation of upper bench, and it changes very little when center and subjacent bench was excavated. This is because upper bench is located in soil, part of center bench in rock, and the whole subjacent bench in rock. Largest shear strain occurs at the arch foot of upper bench. It is concluded that jet grouting piles can control surrounding rock deformation effectively.

scholarly journals Model Test and Numerical Study on Surrounding Rock Deformation and Overburden Strata Movement Law of Gob-Side Entry Retaining via Roof Cutting

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 458 ◽  
Author(s):  
Daoyong Zhu ◽  
Jiong Wang ◽  
Weili Gong ◽  
Zheng Sun
Keyword(s):  
Model Test ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Shanxi Province ◽  
Beam Model ◽  
Physical Test ◽  
Strata Movement ◽  
Deformation Equation ◽  
Surrounding Rock Deformation ◽  
Overlying Strata

The effects of roof cutting techniques on the movement law of the overlying strata and deformation features of the surrounding rock in gob-side entry retaining mines were studied using 200 working faces of the Dianping coal mine in Shanxi Province. Using a mechanical analysis, a cantilever beam model formed by roof cutting was used to derive a deformation equation. The physical model test based on the field prototype revealed an asymmetrically distributed displacement curve and reduced collapse displacement when the rock stratum was far from the cutting seam. Outside of the roof cutting height, the collapse of the overlying strata gradually reached a symmetric distribution with increasing height. The deformation of the retained roadway was mainly concentrated on the roof, and the maximum deformation was 14 mm near the roof cutting side. A numerical simulation of the original size of the model test proved that the laws of strata movement and surrounding rock deformation were consistent with the physical test results. Finally, field measurements were performed, which verified the rationality of this study.

Study on the Deformation Forecasting for the Tunnel Surrounding Rock Using the Neural Network

2013 ◽  
Vol 353-356 ◽  
pp. 828-832
Author(s):  
Guo Feng Wang ◽  
Wen Zhao ◽  
Yong Ping Guan ◽  
Lei Liang
Keyword(s):  
Neural Network ◽  
Maximum Error ◽  
Mining Area ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
The Neural Network ◽  
Sublevel Caving ◽  
Iron Mine ◽  
Set Up ◽  
Surrounding Rock Deformation

The non-pillar sublevel caving method is used in Iron Mine in Banshi. In the mining area, there are many folds and faults, the inclination of ore body changes greatly, and ore and rock are fragmentized. The tunnel often collapsed and the surrounding rock deformation was getting large during the construction stage. Using the data of tunnel surrounding rock deformation, we adopt the neural network method to set up the mapping relation between the tunnel surrounding rock deformation and the project factors, including tunnel deepness, tunnel dimension, measuring time and surrounding rock quality. The analyzing results show that the maximum error between the forecast and the testing data is 13%, which indicates that this method is useful and feasible to the mining engineering. Key words: rock pressure; measure, deformation of the tunnel surrounding rock; neural network; data normalization; mapping

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