Macro-Mechanical Parameters Analysis of Rock Slope Based on the Partition Classification Method

2013 ◽  
Vol 790 ◽  
pp. 310-315
Author(s):  
Jun Wang ◽  
Cheng Jun Peng
Keyword(s):  
Rock Mass ◽  
Classification Method ◽  
Left Bank ◽  
Mechanical Parameters ◽  
The Finite Element Method ◽  
Stability Calculation ◽  
Rock Types ◽  
Structure Surface ◽  
The Stability ◽  
Engineering Stability

Accurate mechanics parameters are the precondition of reasonable calculation in the finite element method to calculate the deformation and stability of the rock mass engineering stability. Partition classification method can be used in the simulation of macro-mechanics parameters of rock mass, for the distribution of multiple sets of multi-level joint fissure in some engineering rock, the parameters of the rock mass can be simulated using the numerical method step by step or by group. Based on the partition classification method, the paper simulated the macro-mechanics parameters of natural slope upstream the left bank toe board of Maerdang hydropower station. The slope is divided into three areas according to the rock types and intensity, weathering degree, fracture, the trend and tendency of the fault, spacing and connected rate of the structure surface, the mechanics parameters of the structure surface, the groundwater conditions, and then use the partition classification method to calculate the region's macro-mechanical parameters, the results can be used to provide amount of reasonable parameters for the stability calculation of the slope in the subsequent deformation.

scholarly journals Research on the Layered Rock Mass Excavation Relaxation Stability of Underground Caverns

2020 ◽  
Vol 165 ◽  
pp. 03024
Author(s):  
Ying Zhang ◽  
Heng Zhou ◽  
Shengjie Di ◽  
Xi Lu
Keyword(s):  
Rock Mass ◽  
Mechanical Characteristics ◽  
Generation System ◽  
Yield Zone ◽  
Layered Rock ◽  
Underground Caverns ◽  
Structure Surface ◽  
Layered Rock Mass ◽  
Power Generation System ◽  
The Stability

In order to compare the influence of rock mass parameters weakening on the deformation and stability of excavation caverns in layered rock mass, based on power generation system caverns of a hydropower station, the stability and deformation of the caverns is analyzed. The results show that the mechanical characteristics of the structure surface play a major role in controlling the stability of caverns. And the displacement and yield zone value of plan 3, which adopt elastic-plastic softening model, are significantly larger than other two. The method which consider the residual strength of structure surface is more suitable for the excavation calculation of layered rock mass cavern.

Stability Calculation of High Side Slope of Diversion Power System Inlet on Left Bank of Jinchuan Power Station

2012 ◽  
Vol 212-213 ◽  
pp. 1071-1075
Author(s):  
Liang Qin Tang ◽  
Dong Yan Liu ◽  
Yong Jian Li
Keyword(s):  
Power System ◽  
Limit Equilibrium ◽  
Site Investigation ◽  
Scientific Basis ◽  
Left Bank ◽  
The Finite Element Method ◽  
Slope Ratio ◽  
Stability Calculation ◽  
Slope Structure ◽  
Structural Surface

The diversion power system intake excavation of Jinchuan Hydropower Station forms a slope of about 160m height; its stability is one of the main geological problems of the project. By detailed site investigation, the engineering geological characteristics of intake slope (including the lithology, slope structure, the structural surface and its combinations, rock weathering and unloading, hydrology etc) is analyzed in this paper. On the basis of site slope ratio statistics, the problem of how to select a safe and economic excavation slope ratio has been studied. The finite element method and rigid limit equilibrium method were used to calculate and analyze slope stability under various working conditions. The results of analysis evaluation provide a scientific basis for the design and construction.

Numerical Simulation of Rock Stability under Dynamic Blasting Load

2007 ◽  
Vol 353-358 ◽  
pp. 1041-1044
Author(s):  
Fu Kun Xiao ◽  
Guang Yi Sun ◽  
Li Hui Tian
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Time Dynamic ◽  
Rock Stability ◽  
Dynamic Stress Field ◽  
The Stability ◽  
Short Time ◽  
Blasting Load

In order to study the effect of blast shake on the stability of tunnel during mining process, finite element analysis software for rock and soil engineering is used to simulate the effect of blasting shake. In the simulation, a short-time dynamic load is applied to the rock in the blasting zone. Dynamic stress field in the rock mass and distortion in the surface of the tunnel are calculated with the finite-element method. Equivalent displacement method is utilized to determine the amount of sudden applied load, the actuation duration and the range of action. Consequently, the maximum critical explosive content at the critical shake speed of rock mass can be defined.

Study about Mechanic Parameter of Slope Rock Mass' Structure Plane

2013 ◽  
Vol 368-370 ◽  
pp. 1551-1555
Author(s):  
Si Yu Wu ◽  
Bo Huang ◽  
Rui Jun Liu
Keyword(s):  
Rock Mass ◽  
Deformation Modulus ◽  
Friction Angle ◽  
Mechanical Parameters ◽  
Test Results ◽  
Rock Mass Structure ◽  
Stability Of Slope ◽  
Slope Rock ◽  
The Stability ◽  
Structure Plane

Firstly, the stability of the slope need to determine mechanical parameters of slope rock mass such as deformation modulus, Poissons ratio, cohesion and internal friction angle, etc. For intact rocks, the mechanical parameters mentioned before are easy to determined. While the stability of slope rock mass is controlled by the deformation and intensity. Therefore, how to determine the mechanical parameters of the structure is the key to analyze the stability of slope rock mass. This paper intends to set the slope rock mass below some extra-large bridge as the research object and use numerical calculation to determine the mechanics parameters of rock mass structure plane on the basis of rock sample mechanics test results.

Thick Board Theory on the Bolting Support of the Ribs in Coal Mine Roadway

2011 ◽  
Vol 255-260 ◽  
pp. 3775-3779 ◽  
Author(s):  
Shuang Suo Yang ◽  
Shao Qing Niu
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Rock Mass ◽  
Main Role ◽  
Mechanical Parameters ◽  
Spacing Interval ◽  
Mine Roadway ◽  
Determination Methods ◽  
Stress And Deformation ◽  
The Stability

According to the character that broken rock mass still has higher compressive strength with appropriate support action though it can not bear tensile stress and deformation character of board with different width-thickness ratios, an idea of keeping the stability of both sides of roadway with anchorage body was put forward, namely, the width(height)-thickness ratio of the anchorage body should be higher than that of the sheet. Thus the higher compression and shear strength can play the main role in keeping the roadway stable. A clear and definite theory for bolting support has been put forward, and the determination methods of geometrical and mechanical parameters of bolting support such as bolting strength, bolt length, spacing, interval of row and bolted length etc. have been deduced.

The Stability Analysis of Over-Dip Stratoid Structure Rock Slope

2012 ◽  
Vol 446-449 ◽  
pp. 1963-1966
Author(s):  
Shu Qiang Lu ◽  
Mo Xu
Keyword(s):  
Rock Mass ◽  
Slope Stability ◽  
Rock Slope ◽  
Simulation Analysis ◽  
Limit Equilibrium ◽  
Field Investigation ◽  
Left Bank ◽  
Diversion Tunnel ◽  
Rock Mass Structure ◽  
The Stability

The rock mass structure of granite is massive, so the stability of granite slope is good. Massive rock become stratoid structure when the rock mass contain discontinuities such as joints and faults. The deformation and destruction of the slope rock mass is controlled by the behaviour and orientation of the discontinuities. Especially, the over-dip discontinuities controlled the slope stability. In this paper, based on the abundant field investigation on the slope in left bank diversion tunnel inlets of Nuozadu power station in Lancang River, the types of rock mass structures and the combination between structural planes and slope surface are studied in detail so as to analyze the slope deformation mechanism. Finally, the slope stability is researched systematically by limit equilibrium method and FLAC numerical simulation analysis. A set of technical and methodological system on stability research of over-dip stratoid structure rock slope will hoped to be established.

scholarly journals Mechanical Parameters of Deep-Buried Coal Goaf Rock Mass Based on Optimized GSI Quantitative Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Qingqiu Wang ◽  
Mo Xu ◽  
Yunhui Zhang ◽  
Xinyu Cen ◽  
Xingwang Chang
Keyword(s):  
Rock Mass ◽  
Surface Condition ◽  
Geological Strength Index ◽  
Mechanical Parameters ◽  
Rock Types ◽  
Integrity Index ◽  
Disturbance Factor ◽  
Structural Surface ◽  
Test Result ◽  
Quantitative Formula

In order to obtain the accurate mechanical parameters of deep-buried coal goaf rock mass, the limitation of geological strength index (GSI) in concealed rock mass is analyzed. Based on the test result and analysis of the current normative standards, the classification indexes of rock mass structural are optimized based on discontinuity distance d and rock mass integrity index K v . The ratio of rock mass saturated strength to dry strength, η, is introduced, quantization formula of structural surface conditions is proposed, and the influence of groundwater and rock types is included in structural surface condition classification. The GSI system is improved to better suit all types of deep-buried and water-rich rock masses. Furthermore, the rock mass disturbance factor D’s quantitative formula is listed according to the Hoek–Brown (HB) criterion. Taking the goaf roof under railway as an example, the parameters of deep-buried rock mass are obtained based on the improved quantitative GSI system and HB criterion. This research provides a scientific reference for achieving geological parameters and engineering designing in goaf areas.

scholarly journals Analysis of Stress-Strain States in the Vicinity of Mining Excavations in a Rock Mass with Variable Mechanical Properties

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5567
Author(s):  
Marek Jendryś ◽  
Stanisław Duży ◽  
Grzegorz Dyduch
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Numerical Simulations ◽  
Mechanical Parameters ◽  
Mining Operations ◽  
Axial Forces ◽  
Internal Forces ◽  
Random Variability ◽  
The Stability ◽  
The Impact

Rock mass is a medium created through processes that have lasted over four billion years, and its intrinsic feature is the variability of the parameters that describe it. A particularly high variability of mechanical parameters is observed in Carboniferous sedimentary and metamorphic rocks. The mechanical properties, especially the rock mass strength, are essential for the design and maintenance of the stability of excavations conducted in it and for the safe conduct of mining operations. This article presents the test results confirming the random variability of the mechanical parameters of the rock mass. The second part of the article presents the results of numerical simulations mapping the Carboniferous rock mass along with a 1000 m deep tunnel excavation protected by steel arch supports. Numerical simulations were carried out for models with different variability coefficients of strength and deformation parameters, and the obtained results were analyzed in terms of damage zones and rock mass stress state as well as axial forces in the modelled supports. The results of the simulation demonstrate the impact of the variability of rock mass properties on its state in the vicinity of the excavation and, consequently, on the internal forces in the steel supports and their uneven loading along the length of the excavation. This fact should be taken into account in their design.

Numerical Analysis of Deformation and Stability of Reinforced High Retaining Wall

2013 ◽  
Vol 405-408 ◽  
pp. 227-232
Author(s):  
Yi Tong Liu ◽  
Xing Huang
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Retaining Wall ◽  
Scientific Basis ◽  
The Finite Element Method ◽  
Stability Calculation ◽  
Systematic Analysis ◽  
The Stability ◽  
Reinforced Retaining Wall

To solve the designing problem in control the deformation and stability of reinforced retaining wall in the airport, the paper introduced the method of finite element strength reduction. After the determination of the soil constitutive model, the geogrid reinforcement constitutive model and stability calculation parameters, the research established the stability and deformation numerical simulation model of a reinforced retaining wall, and carried out a systematic analysis of the retaining wall by the finite element method, provided a scientific basis in order to ensure slope safety and optimized the retaining wall design.

scholarly journals The importance of pre-tensioning cable bolts used to reinforce of arch yielding support

2018 ◽  
Vol 66 ◽  
pp. 03003
Author(s):  
Zbigniew Rak ◽  
Jerzy Cieślik ◽  
Jerzy Stasica ◽  
Pavel Dvořák
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Hard Coal ◽  
The Finite Element Method ◽  
Fractured Rock Mass ◽  
Cable Bolts ◽  
Vertical Displacements ◽  
Hard Coal Mining ◽  
The Stability ◽  
Yielding Support

Widespread in Polish hard coal mining, cable bolts are used to reinforce the arch yielding support of roadways. This article attempts to prove that change in approach to long bolting technology can bring significant benefits in terms of improving the stability of roadways, including limiting the development of the fracturing zone in the roof, and ultimately also increasing the frame spacing of arch yielding support. The article contains the results of numerical calculations using the finite element method showing the effect of pre-tensioning on the work of cable bolts installed in a situation when a zone of a fractured rock mass appeared in a roof excavation. As a result of the calculations, the dependence of the final vertical displacements of the roadways roof on different pre-tensioning variants of the cable bolts was presented. The second part of the article presents the practical aspects of the use of cable bolts with pre-tensioning in reinforcing the rock mass and arch yielding support of roadways. In addition, the article identifies the developments in bolting technology which could lead to an increase in work safety and reduce the costs of arch yielding support.

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