scholarly journals Study and Application on Stability Classification of Tunnel Surrounding Rock Based on Uncertainty Measure Theory

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Hujun He ◽  
Yumei Yan ◽  
Cuixia Qu ◽  
Yue Fan
Keyword(s):  
Measure Theory ◽  
Influence Factors ◽  
Surrounding Rock ◽  
Uncertainty Measure ◽  
In Situ Data ◽  
Rock Stability ◽  
Practical Engineering ◽  
Stability Classification ◽  
Recognition Criterion

Based on uncertainty measure theory, a stability classification and order-arranging model of surrounding rock was established. Considering the practical engineering geologic condition, 5 factors that influence surrounding rock stability were taken into account and uncertainty measure function was obtained based on the in situ data. In this model, uncertainty influence factors were analyzed quantitatively and qualitatively based on the real situation; the weight of index was given based on information entropy theory; surrounding rock stability level was judged based on credible degree recognition criterion; and surrounding rock was ordered based on order-arranging criterion. Furthermore, this model was employed to evaluate 5 sections surrounding rock in Dongshan tunnel of Huainan. The results show that uncertainty measure method is reasonable and can have significance for surrounding rock stability evaluation in the future.

scholarly journals Surrounding Rock Stability Classification Method of Coal Roadway Based on In Situ Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yongjie Yang ◽  
Gang Huang ◽  
Lingren Meng
Keyword(s):  
Fuzzy Clustering ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
Evaluation Indexes ◽  
Rock Stability ◽  
Coal Roadway ◽  
Fuzzy Clustering Method ◽  
Stability Classification

In situ stress is one of the most important factors affecting surrounding rock stability classification of coal roadway. Most surrounding rock stability classification methods do not fully consider the influence of in situ stress. In this paper, the author applied a fuzzy clustering method to the classification of surrounding rock stability of coal roadway. Taking into account the complexity of the classification of surrounding rock, some factors such as the strength of surrounding rock, in situ stress, the main roof first weighting interval, the size of the chain pillar, and the immediate roof backfilled ratio are selected as the evaluation indexes. The weight coefficients of these evaluation indexes are determined by unary regression and multiple regression methods. Using fuzzy clustering and empirical evaluation method, the classification model of surrounding rock stability of coal roadway is proposed, which is applied to 37 coal roadways of Zibo Mining Group Ltd., China. The result is in good agreement with practical situation of surrounding rock, which proves that the fuzzy clustering method used to classify the surrounding rock in coal roadway is reasonable and effective. The present model has important guiding significance for reasonably determining the stability category of surrounding rock and supporting design of coal roadway.

Application of Catastrophe Theory in Surrounding Rock Stability

2013 ◽  
Vol 712-715 ◽  
pp. 974-978
Author(s):  
Din Ge Kong ◽  
Kai Hu
Keyword(s):  
Catastrophe Theory ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Rock System ◽  
Instability Problem ◽  
Rock Stability ◽  
Highly Nonlinear ◽  
Practical Engineering ◽  
Simplified Mechanical Model ◽  
Catastrophic Model

Surrounding rock system of underground engineering is highly nonlinear, and there is no unified cognition for its stability criteria. Introduces the basic principle of catastrophe theory, focusing on the cusp catastrophic model, build a simplified mechanical model for the surrounding rock, and the instability of surrounding rock of the cusp catastrophic model is obtained. In practical engineering, it is show that catastrophe theory is an effective method to study the instability problem of the tunnel.

scholarly journals Study on the Influence of In Situ Stress Distribution on the Stability of Roadway Surrounding Rock

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Tao Li ◽  
Hao Gong ◽  
Guoliang Xu
Keyword(s):  
Stress Distribution ◽  
Principal Stress ◽  
Three Dimensional ◽  
Maximum Principal Stress ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
Rock Stability ◽  
Induced Stress ◽  
Stress Direction

In order to understand the instability characteristics of surrounding rock in the process of deep roadway excavation, a three-dimensional numerical model was established by FLAC3D to systematically analyze the influence of roadway surrounding rock stability under different in situ stress distribution forms, and the environmental coefficient of mining-induced stress η was defined, the larger the environmental coefficient of mining-induced stress is, the larger the surrounding rock stress environment is, and the range where the η coefficient is greater than 0.2 is called with the destruction-danger zone. When the initial vertical stress is maximum principal stress and minimum principal stress, by comparing the roadway along the middle ground stress direction and minimum or maximum in-situ stress direction, the variation characteristics of displacement, failure zone and failure hazard zone of roadway surrounding rock are obtained, which provides theoretical basis for the treatment of disaster accidents such as roadway surrounding rock instability and rock burst caused by deep high in-situ stress.

scholarly journals The evaluation of potential for the exploration and development of coalbed methane resources based on an improved uncertainty measure optimization model

2018 ◽  
Vol 37 (1) ◽  
pp. 315-331 ◽  
Author(s):  
Jie Fang ◽  
Hujun He ◽  
Le An ◽  
Gang Jin
Keyword(s):  
Coalbed Methane ◽  
Measure Theory ◽  
Influence Factors ◽  
Uncertainty Measure ◽  
Practical Application ◽  
Coal Basin ◽  
Entropy Weight ◽  
Qinghai Province ◽  
Using Data ◽  
Exploration And Development

The recognition criteria of credible degree in uncertainty measure theory are improved based on the concept of distance discriminant and used to evaluate the potential for exploration and development of coalbed methane. This paper uses a systematic approach to establish a mathematical model based on entropy weight and improved uncertainty measure theory. In this model, uncertainty influence factors were analyzed qualitatively and quantitatively using data for the Muli coalfield of Qinghai province, China. The uncertainty measure function is based on experimental data, and the weight of index is determined by entropy weight theory. Optimization credible degree recognition criteria were used to evaluate the potential for coalbed methane exploration and development of six mines in the Muli coalfield. These data indicate that evaluation results obtained using entropy weight and improved uncertainty measure theory have practical application and can effectively assess the exploration and development potential of coalbed methane in a coal basin.

ANSYS Simulating Analysis of a 3D High-Temperature Stope Reinforced in Advance with Fully Grouted Cable Bolts

2012 ◽  
Vol 170-173 ◽  
pp. 525-528 ◽  
Author(s):  
Feng Lin Zhan ◽  
Ping Ye
Keyword(s):  
High Temperature ◽  
Ground Surface ◽  
Surrounding Rock ◽  
In Situ Experiment ◽  
Copper Mine ◽  
Rock Stability ◽  
Cable Bolts ◽  
Simulating Analysis

By using ANSYS, 3D high-temperature stope models based on the in-situ experiment of reinforcement with fully grouted cable bolts in the test stope hangingwall of Dongxiang Copper Mine are established and analyzed. Results show that both displacements of ground surface and stope hangingwall are in their allowable scopes. The surrounding rock rising displacement caused by heated rock expansion can partly or fully offset the subsidence displacement caused by gravity. Hangingwall rising displacement occurs if stope temperature is equal to or greater than 100°C. Mining is safe if stope temperature is equal to or less than 500°C. The stope hangingwall anchoring parameters can meet the requirements of surrounding rock stability in the process of extraction.

Analysis of Influence Factors of Tunnel Surrounding Rock Stability and Researches of its Control Methods

2013 ◽  
Vol 438-439 ◽  
pp. 979-982
Author(s):  
Xian Kai Bao
Keyword(s):  
Influence Factors ◽  
Surrounding Rock ◽  
Control Methods ◽  
Engineering Construction ◽  
Entire Process ◽  
Rock Stability ◽  
Stability Of Surrounding Rock ◽  
Relationship Of ◽  
The Relationship ◽  
Non Destructive

This paper analyzes various factors about the surrounding rock stability in tunnel, on this basis, proposes control methods and ideas about the surrounding rock stability in tunnel, and discusses in detail the relationship of bolt working load and the surrounding rock stability. Using the approach of non-destructive monitoring bolts can be well monitor the surrounding rock stability of entire process. The result will provide great reference for research studies on stability of surrounding rock and the engineering construction.

Research Status and Development Trends of Roadway Surrounding Rock Stability Classification

2014 ◽  
Vol 580-583 ◽  
pp. 1352-1357 ◽  
Author(s):  
Ren Liang Shan ◽  
Xiang Song Kong ◽  
Jian Liu ◽  
Jian Fang Li ◽  
Yao Bai ◽  
...  
Keyword(s):  
New Technology ◽  
Surrounding Rock ◽  
Development Trends ◽  
Research Status ◽  
New Methods ◽  
Rock Stability ◽  
Safe Production ◽  
Stability Classification

Stability classification of roadway surrounding rock is of great significance as the prerequisite of safe production in roadway engineering. Based on a great number of issues analysis, the research status of roadway surrounding rock stability classification has been dissected from aspects of classification indexes and methods. At the end, it has put forward that choosing scientific and reasonable indexes, applying combined technology with more than three methods, using new technology and new methods are the three development trends of roadway surrounding rock stability classification research.

Design and Field Test of Bolt-Mesh-Cable Support of Extraction Drift in Soft Thick Seam with a Large Angle

2011 ◽  
Vol 243-249 ◽  
pp. 3565-3571
Author(s):  
Dong Ming Guo ◽  
Jing Zhao Zhuang ◽  
Yi Zhang ◽  
Yan Bin Wang ◽  
Ren Shu Yang
Keyword(s):  
Large Angle ◽  
Support Effect ◽  
Surrounding Rock ◽  
Surface Load ◽  
Thick Seam ◽  
Rock Stability ◽  
Ground Pressure ◽  
Geological Conditions ◽  
Stability Classification ◽  
Bolt Support

Considering the poor support results of extraction drift in soft thick seam with a large angle in Dujiacun Mine, and there’s no similar design in such engineering geological conditions. Firstly, determined surrounding rock stability classification of the drift and obtained that roadway surrounding rock of this mine is type. According to the approximate range of this type roadway surrounding rock, selected parameters of bolt support, then using FLAC3Dsoftware simulated support effect of the roadway with different parameters of bolt support, analyzed the extent of the support effect of various parameters. The simulation results show that the optimal program is φ2200mm round steel bolt in the roof andφ2500mm equal strength thread steel in the two sides. Monitoring results of ground pressure displacement of surface, load of bolt and amount of roof separation show that bolt-mesh-cable support is safe and effective.

scholarly journals Stabilization of Rock Roadway under Obliquely Straddle Working Face

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5759
Author(s):  
Peng Wang ◽  
Nong Zhang ◽  
Jiaguang Kan ◽  
Bin Wang ◽  
Xingliang Xu
Keyword(s):  
Dynamic Pressure ◽  
Stability Control ◽  
Surrounding Rock ◽  
Horizontal Distance ◽  
Floor Rock ◽  
Rock Stability ◽  
Ground Pressure ◽  
Working Face ◽  
Rock Roadway

A floor rock roadway under an oblique straddle working face is a typical dynamic pressure roadway. Under the complex disturbance of excavation engineering works, the roadway often undergoes stress concentration and severe deformation and damage. To solve the problem of surrounding rock stability control for this roadway type, this study considered the East Forth main transport roadway in the floor strata of the 1762(3) working face of the Pansan coal mine. In situ ground pressure monitoring and numerical simulation calculation using the FLAC2D software were carried out. The influence laws of the surrounding rock lithology, the vertical and horizontal distance between the roadway and overlying working face, the positional relationship between the roadway and the overlying working face, and the support form and strength of the rock surrounding an oblique straddle roadway were obtained. Within the range of mining influence, the properties of the rock surrounding the roof and floor were very different, and the deformation of the rock surrounding the two sides exhibited regional difference. The influence range of the mining working face on the rock floor of the roadway was approximately 30–40 m, and that of horizontal mining was approximately 50–60 m. The mining influence on the rock surrounding the side roadway of the working face is large, but the mining influence on the roadway below is small. Using FLAC2D, the stress and displacement characteristics of the rock surrounding the obliquely straddle roadway were compared and analyzed when the bolt support, combined bolt and shed support, and bolt–shotcreting–grouting support were adopted, the proposed support scheme of bolting and shotcreting was successfully applied. The deformation of the rock surrounding the roadway was satisfactorily controlled, and the results were useful as a reference for similar roadway maintenance projects.

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