Active lateral pressure to rigid retaining walls in the presence of an adjacent rock mass

2022 ◽  
Vol 15 (2) ◽  
Author(s):  
Mahdi Maleki ◽  
Meysam Imani
Keyword(s):  
Rock Mass ◽  
Lateral Pressure ◽  
Retaining Walls ◽  
Adjacent Rock

scholarly journals Numerical Simulation on Large Deformation of Weak Rock Mass Tunnel Under High Geostress

2018 ◽  
Vol 175 ◽  
pp. 03025
Author(s):  
Feng Zhou ◽  
Hongjian Jiang ◽  
Xiaorui Wang
Keyword(s):  
Rock Mass ◽  
Large Deformation ◽  
Lateral Pressure ◽  
Simulation Analysis ◽  
Pressure Coefficient ◽  
Surrounding Rock ◽  
Analog Simulation ◽  
Lateral Pressure Coefficient ◽  
High Geostress ◽  
The Stability

The problem about the stability of tunnel surrounding rock is always an important research object of geotechnical engineering, and the right or wrong of the result from stability analysis on surrounding rock is related to success or failure of an underground project. In order to study the deformation rules of weak surrounding rock along with lateral pressure coefficient and burying depth varying under high geostress and discuss the dynamic variation trend of surrounding rock, the paper based on the application of finite difference software of FLAC3D, which can describe large deformation character of rock mass, analog simulation analysis of surrounding rock typical section of the class II was proceeded. Some conclusions were drawn as follows: (1) when burying depth is invariable, the displacements of tunnel surrounding rock have a trend of increasing first and then decreasing along with increasing of lateral pressure coefficient. The floor heave is the most sensitive to change of lateral pressure coefficient. The horizontal convergence takes second place. The vault subsidence is feeblish to change of lateral pressure coefficient. (2) The displacements of tunnel surrounding rock have some extend increase along with increasing of burying depth. The research conclusions are very effective in analyzing the stability of surrounding rock of Yunling tunnel. These are going to be a reference to tunnel supporting design and construction.

Calculation of Retaining Walls with Anchoring at Different Levels

2015 ◽  
Vol 725-726 ◽  
pp. 185-189
Author(s):  
Alexey Melentev ◽  
Vladimir Korovkin
Keyword(s):  
Lateral Pressure ◽  
Retaining Wall ◽  
Bending Moment ◽  
Retaining Walls ◽  
Neutral Axis ◽  
Plastic Yielding ◽  
Optimal Production ◽  
Upper Limit ◽  
Different Levels ◽  
Practical Recommendations

Shows the proposed method for the calculation of mirroring duhaney retaining wall. This method is through the use of multiple design schemes can more accurately determine the lateral pressure on the wall, given compliance supports. In this case, the bending moment diagram in the wall and supports efforts depend on the variable diagrams of lateral pressure on the wall associated with the position of the line relative to its elastic neutral axis. Given the uncertainty about the quantities displacement of supports, it is proposed to take into account the upper limit of the voltage equal to the appearance of the yield plateau in the anchor rod. In this case, the plastic yielding of the anchor rod to limit effort in it, due to the redistribution of stresses to the other rod. Practical recommendations for the optimal production of works in the construction of continuous dvuhankerny walls.

scholarly journals STABILITY ASSESSMENT OF ADJACENT ROCK MASS IN THE DEVELOPMENT OF COALBED OUTLETS

2018 ◽  
pp. 51-59
Author(s):  
Olga G. Bessimbaeva ◽  
Elena N. Khmyrova ◽  
Farit K. Nizametdinov ◽  
Elena A. Oleinikova
Keyword(s):  
Rock Mass ◽  
Coal Seam ◽  
Active Phase ◽  
Geological Structure ◽  
Stability Assessment ◽  
South Side ◽  
Southern Side ◽  
The Stability ◽  
External Forces ◽  
Adjacent Rock

The problems of stability assessment of the quarry’s southern side during the development of the coal seam D6 are considered. To  assess the stability of the quarry’s southern side in the development  of coalbed outlets, modern research methods are applied: study of  the geological structure and analysis of the adjacent rock mass  state, the creation of an observation station and the production of observations, calculation of stability of adjacent rock mass of the  quarry’s south side and the research results analysis. Quarry’s south  side consists of clayey sediments up to 5 m, then siltstones and  mudstones up to 10-20 m and a coal seam with a capacity of up to  5 m. The substantiation of the calculated strength characteristics of  rocks composing the slopes of the quarry ledges, which determine the stress state of the slopes arising under the influence  of internal and external forces, is done. Instrumental observations of the laid station and the survey of cracks on the quarry’s side allowed  to determine the contours of the deformation zone and the  landslide prism size. A geomechanical model of adjacent rock mass  was created and the stability assessment was carried out for the  geological section along the line of the maximum development  depth. After additional loading on the quarry’s southern side slopes,  the safety factor of stability is nу = 1.69−173, which means active  phase termination of quarry’s side deformation and sustainable condition.

scholarly journals Structural Analysis of Cantilever Retaining Wall using STAAD PRO and Compare with Manual Calculations

2021 ◽  
Vol 9 (VII) ◽  
pp. 582-588
Author(s):  
Nikhil Nimkarde
Keyword(s):  
Reinforced Concrete ◽  
Structural Analysis ◽  
Safety Factor ◽  
Lateral Pressure ◽  
Retaining Wall ◽  
Base Plate ◽  
Retaining Walls ◽  
Higher Moments ◽  
Seismic Zones ◽  
Different Types

Reinforced concrete retaining walls have a vertical or sloping stem cast by the base plate. They are considered suitable for a height of 6 m. It resists lateral pressure on the ground by the cantilever action of the stem, plate on the legs and heel plate. The tendency of the wall to slide forward due to lateral pressure on the ground should be investigated, and a safety factor of 1.5 should be provided against slipping. Consolidated retaining walls are best at a height of 6 m. For a greater height, the pressure on the ground due to the preserved filling will be higher due to the effect of the lever arm, the base produces higher moments, which leads to a higher section for designing stability, as well as to the design structures of the structure. In this paper, structural analysis should be performed in the case of wall retention with different types of joints and span. The cantilever retaining wall and the buttress retaining wall are modeled for different seismic zones.

Numerical Study on Tunnel Mechanics in Jointed Rock Mass with Finite Element Method

2011 ◽  
Vol 99-100 ◽  
pp. 790-795
Author(s):  
Ming Gao Zhang ◽  
Heng Bin Wu ◽  
Ze Ping He ◽  
Ting Qiang Zhou
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Plastic Zone ◽  
Lateral Pressure ◽  
Numerical Study ◽  
Pressure Coefficient ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Lateral Pressure Coefficient ◽  
Element Method

Tunnel mechanics mainly depend on joints properties in layered and jointed rock mass, and most of the present methods adopted in numerical analysis are distinct element method. Combining to the Gaixiaba tunnel, considering the jointed properties such as dip angles, distances and lateral pressure coefficient, the finite element models are made in this paper. Results show that the plastic zone and total displacement presented a symmetric distribution with the axial of joints dip, and the plastic zone is very similar to the results suggested by Goodman. The dip angles, distances of joints and lateral pressure coefficient have significant effect on the tunnel mechanics.

Moderate blasting technologies: Experience and prospects for introduction in Polyus mines

2021 ◽  
pp. 86-92
Author(s):  
R. A. Rakhmanov ◽  
◽  
V. N. Lushnikov ◽  
I. A. Alenichev ◽  
◽  
...  
Keyword(s):  
Rock Mass ◽  
Efficient Method ◽  
Dynamic Effect ◽  
Seismic Effect ◽  
Rock Fragmentation ◽  
Blast Design ◽  
Current Task ◽  
Mining Safety ◽  
And Control ◽  
Adjacent Rock

It is commonly known that rock fragmentation by blasting is the most economically efficient method to prepare large volumes of rock mass to excavation and handling. The drilling and blasting technology accepted by a mine governs both rock fragmentation quality and mining safety connected with slope stability. Therefore, optimization of drilling and blasting is an objective calling for the effective blast design and control. This article presents the main principles and methods of moderate blasting implemented at Polyus company towards minimization of impact on pit walls and benches. The main point is stagewise reduction of the dynamic effect exerted by blasting on rock mass when approaching the ultimate pit limits. Polyus company initiated the far and wide review and introduction of the best international practices for improvement of blasting operations near the ultimate pit limits. The article describes the activities undertaken within implementation of projects on drilling and blasting technology justification and improvement to enhance stability of pit walls and, as a consequence, to reduce geotechnical hazards. As a complimentary measure to abate seismic effect of explosions on adjacent rock mass, the nonelectric blasting is replaced by electronic blast initiation systems with more accurate delay intervals, which almost nullifies probability of simultaneous ignition of two or more charges and ensures, thereby, the acceptable and seismically safe modes of blasting of large rock blocks. Furthermore, the introduction of the electronic blasting cardinally changes the approach to blasting order and sequence per intervals in blast holes depending on the current task within a block to be blasted.

scholarly journals Design Diagrams for the Analysis of Active Pressure on Retaining Walls with the Effect of Line Surcharge

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Mojtaba Ahmadabadi ◽  
Mohammad Karim Faghirizadeh
Keyword(s):  
Pressure Distribution ◽  
Lateral Pressure ◽  
Limit Equilibrium ◽  
Pressure Coefficient ◽  
Failure Surface ◽  
Retaining Walls ◽  
Software Environment ◽  
Active Pressure ◽  
Failure Wedge ◽  
Different Soils

In this study, a formulation has been proposed to calculate the pressure on wall and determine the angle of failure wedge based on limit equilibrium method. The mentioned formulation is capable of calculating active pressure coefficient, culmination of forces in failure surface, and pressure distribution on wall with the effect of line surcharge. In addition, based on the proposed method, a simple formula has been proposed to calculate the angle of failure wedge by the effect of surcharge. Moreover, the proposed approach has the advantage of taking into account the effect of surcharge on elastoplastic environment by considering the parameters of soil and determining the extent to which the surcharge is effective in pressure distribution on the wall. However, in most previous methods and specifications, resultant lateral pressure from surcharge in elastic environment had been considered. Finally, based on the obtained results, the design diagrams for different soils and different surcharges have been proposed. According to these diagrams, pressure on wall, pressure distribution on wall, and angle of failure wedge will easily be achieved. Also, a computer program has been written in MATLAB software environment. Using the results of these codes, the pressure on wall with the effect of surcharge, the angle of failure wedge, and pressure distribution on wall will be determined.

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