scholarly journals Combined support mechanism of rock bolts and anchor cables for adjacent roadways in the external staggered split-level panel layout

2021 ◽  
Author(s):  
Adrian Batugin ◽  
Zhiqiang Wang ◽  
Zehua Su ◽  
Shermatova Sayyora Sidikovna
Keyword(s):  
Mechanical Properties ◽  
Side Wall ◽  
Rock Bolt ◽  
Rock Bolts ◽  
Thick Coal Seam ◽  
Support Mechanism ◽  
Anchor Cable ◽  
Side Rock ◽  
Air Intake ◽  
The Stability

AbstractUsing the spatial structure of the external staggered split-level panel layout, a combined support technology for adjacent roadways was developed and analyzed for a rock bolt and anchor cable mechanism. The influence of the side rock bolt and anchor cable parameters on the mechanical properties of the anchorage body and the support stress distribution of the lateral coal body were revealed using the FLAC3D software. The optimal support parameters of the side rock bolts and anchor cables were subsequently determined, and the support effect of gob-side entry in a mining scenario was verified. The results show that the support of the side rock bolts and anchor cables improves the mechanical properties and stress state of the anchorage body, producing a good protective effect on the coal body of the air-intake entry roof and side wall. This is beneficial to the stability of the side wall and the realization of the suspension effect for roof rock bolts and anchor cables, which in turn makes the surrounding rock maintenance of the gob-side entry to a thick coal seam more favorable.

scholarly journals Combined support mechanism of rock bolt and anchor cable for adjacent roadways in the external staggered split-level panel layout

2020 ◽  
Author(s):  
Adrian Batugin ◽  
Zhiqiang Wang ◽  
Wenyu Lv ◽  
Zehua Su ◽  
Shermatova Sayyora Sidikovna
Keyword(s):  
Mechanical Properties ◽  
Side Wall ◽  
Rock Bolt ◽  
Structure Characteristic ◽  
Thick Coal Seam ◽  
Support Mechanism ◽  
Anchor Cable ◽  
Side Rock ◽  
Air Intake ◽  
The Stability

Abstract Utilizing the spatial structure characteristic of the external staggered split-level panel layout, the combined support technology of adjacent roadways was proposed, and combined support mechanism of rock bolt and anchor cable was analyzed. The influence of side rock bolt and anchor cable parameters respectively on mechanical properties of the anchorage body and support stress distribution of lateral coal body were revealed through FLAC 3D software. The optimal support parameters of side rock bolt and anchor cable were determined subsequently. And the support effect of the gob-side entry under mining influence was verified. Result shows that the support of side rock bolt and anchor cable can improve mechanical properties and the stress state of the anchorage body, which has a good protective effect on the coal body of the air-intake entry roof and side wall. It is beneficial to the stability of the side wall and the realization of the suspension effect for the roof rock bolt and anchor cable, which makes the surrounding rock maintenance of the gob-side entry of the thick coal seam more favorable.

scholarly journals Combined support mechanism of rock bolt and anchor cable for adjacent roadways in the external staggered split-level panel layout

2020 ◽  
Author(s):  
Adrian Batugin ◽  
Wang Zhiqiang ◽  
Su Zehua ◽  
Shermatova Sayyora Sidikovna
Keyword(s):  
Mechanical Properties ◽  
Side Wall ◽  
Support Effect ◽  
Rock Bolt ◽  
Thick Coal Seam ◽  
Support Mechanism ◽  
Anchor Cable ◽  
Side Rock ◽  
Air Intake ◽  
The Stability

Abstract Utilizing the spatial structure characteristics of the external staggered split-level panel layout, the combined support technology of adjacent roadways is proposed, and combined support mechanism of rock bolt and anchor cable were analyzed. The influence of the side rock bolt and anchor cable parameters respectively on the mechanical properties of the anchorage body and support stress distribution of lateral coal body was revealed through FLAC3D software. The optimal support parameters of side rock bolt and anchor cable were determined subsequently. And the support effect of the gob-side entry under mining influence was verified. Result shows that the support effect of side rock bolt and anchor cable can improve the mechanical properties and the stress state of the anchorage body, which has a good protective effect on the coal body of the air-intake entry roof and side wall. It is beneficial to the stability of the side wall and the realization of the suspension effect for the roof rock bolt and anchor cable, which makes the surrounding rock maintenance of the gob-side entry of the thick coal seam more favorable.

scholarly journals Research and Performance Test of New Full-Length Anchorage Material

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Shunjie Huang ◽  
Xiangrui Meng ◽  
Guangming Zhao ◽  
Yingming Li ◽  
Xiang Cheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Performance Test ◽  
Strong Stability ◽  
Full Length ◽  
Anchor Cable ◽  
New Material ◽  
Anchoring Strength ◽  
The Stability ◽  
Ultrafine Cement

It is difficult to support roadway with anchor cable in view of impact tendency in impinging liability roadway; a new material of inorganic and high-performance full-length anchoring material for anchoring cable is developed by adding several modifiers with ultrafine cement as the main material. The purpose is to improve the mechanical properties and durability of cement-based materials, improve the coordination of anchor cable support system, and ensure the stability of surrounding rock of mining roadway. The new full-length anchoring material is developed by optimizing the proportion of different components of the material, and the mechanical properties of the new material were studied. The anchoring force of resin anchoring agent, ordinary Portland cement, blank ultrafine cement, and new full-length anchoring material are tested. Based on SEM microscopic characterization, the fracture types and failure characteristics of resin anchoring agent and full-length anchoring material are researched. The results show that the optimal content of each component of the new inorganic high-performance full-length anchorage material is as follows: the content of component A is 15%, the content of component B is 3%, the content of component C is 0.2%, the content of component D is 1%, and the content of component E is 1%; the tensile test shows that the full-length anchoring material has good bonding property, high anchoring strength, strong stability, and good rock coupling. SEM microstructure and morphology analysis have showed that the new anchorage materials can fully hydrate each other, resulting in a relatively dense stone body. The new full-length anchoring material can effectively improve the anchoring force and improve the stability of the anchor cable and has significant performance advantages and good engineering applicability, and it has the advantages of lower cost and safer to use. The new material is a very good supporting material for roadway.

The Study on Mechanical Properties of Karst Tunnel

2011 ◽  
Vol 243-249 ◽  
pp. 3399-3402
Author(s):  
Bin Li ◽  
Tai Yue Qi
Keyword(s):  
Mechanical Properties ◽  
Numerical Models ◽  
Side Wall ◽  
Surrounding Rock ◽  
Karst Tunnel ◽  
Safety Coefficient ◽  
Coefficient Distribution ◽  
Unfavorable Effect ◽  
Adverse Influence ◽  
The Stability

Several numerical models were built by FLAC3D to simulate tunnel with karst around spandrel, tunnel with karst around springe, tunnel with karst around inverted arch and tunnel with karst around side wall. The influence of karsts on the deformation of lining and the safety coefficient distribution of surrounding rock after excavation was analyzed. The results from the numerical modeling suggest as follows: karst around spandrel has extremely unfavorable effect on the deformation of lining and the safety of surrounding rock above the vault, karst around side wall also seriously affect the stability of tunnel due to the asymmetry pressure on tunnel caused by karst, consequently, auxiliary measures should be taken to handle these two cases; karst around springe and karst around inverted arch has limited adverse influence on the overall safety of tunnel, backfill measures are enough to handle these two cases.

scholarly journals Investigation of rock bolting for tunnels based on an efficient CATIA-ABAQUS model

2019 ◽  
Vol 295 ◽  
pp. 03002
Author(s):  
Hui Lee ◽  
Wei-zhong Chen ◽  
Xian-jun Tan ◽  
Qiao-chu Yang ◽  
Xiao-gang Wang
Keyword(s):  
Knowledge Engineering ◽  
Axial Stress ◽  
Great Influence ◽  
Vertical Displacement ◽  
Rock Bolt ◽  
Rock Bolts ◽  
Distribution Features ◽  
The Stability ◽  
Logarithmic Relationship ◽  
Abaqus Model

As a widely used reinforcement method in tunnel engineering, the accuracy of models in numerical analysis has a vital influence on the reliability of the analysis results. To solve the problem of hard modeling for complicated models, this paper proposes to build models of different characteristics automatically by the means of Enterprise Knowledge Language (EKL) of CATIA, combining knowledge engineering template with parameterization. Furthermore, the stability of surrounding rocks and the distribution features of plastic areas were studied in different cases by CATIA-ABAQUS model. Besides, the effects and contributions of several parameters, including the rock-bolt diameter and interval between rock-bolts have been studied. It was found that: (1) Rock-bolt has a notable effect on the stability of the surrounding rocks. Increasing the diameter of rock-bolts contributes to significantly reduce the plastic area and the vertical displacement. With the increase of the quantity and the diameter of anchors, the degree of influence gradually weakens, showing the logarithmic relationship; (2) When the quantity and diameter of rock-bolts are constant, in the case in which the intervals between rock-bolts are various, the plastic area of surrounding rocks and the axial stress of rock-bolts are larger than that of the same distance, while the vertical displacement are uniform. (3) The excavation process has a great influence on the axial stress of rock-bolts and the redistribution of stresses in the surrounding rock.

Analysis of Yielding Steel Arch Support with Rock Bolts in Mine Roadways Stability Aspect

2014 ◽  
Vol 59 (3) ◽  
pp. 641-654 ◽  
Author(s):  
Tadeusz Majcherczyk ◽  
Zbigniew Niedbalski ◽  
Piotr Małkowski ◽  
łukasz Bednarek
Keyword(s):  
Support System ◽  
Support Systems ◽  
Coal Mines ◽  
Rock Bolt ◽  
Rock Bolts ◽  
Mining Conditions ◽  
Arch Support ◽  
The Stability ◽  
Rock Bolt Support ◽  
Rockbolt Support

Abstract The result of the search for new technological solutions in the field of support for roadways in coal mines has in recent years been the widespread use of steel arch with rockbolt support systems. The efficiency of these systems is affected among other things by the option of installing rock bolts after the actual driving the mine roadway, the increased load capacity that these systems can support, and their resistance to dynamic weight. Large variation in the way that these steel arch support can be connected using different types of rock bolts necessitates mining research revealing the effectiveness of such solutions. Although the steel arch with rockbolt support system is used in the majority of European coal mines, it is still not possible to apply templates of schemes due to the diversity of geological and mining conditions. Therefore, throughout a period of several years, the authors of this article conducted research in situ under conditions of different schemes related to connecting arched support frames with rock bolts, with only selected results being presented in the article. The measurements of convergence, load supported by the system frame, load supported by the rock bolts, and the stratification of roof rocks were analyzed, carried out in two roadways with yielding steel arch support in which strand bolts were applied. The article also proposes the index for working maintenance nuw, used in preliminarily assessing the stability of a given working with a limited number of data concerning geomechanical conditions. Additionally considered are empirical methods used in Poland for designing steel arch with rock bolt support systems. The results of mine research indicate that strengthening yielding steel support with strand bolts through steel beams maintains the stability of a roadway, even when exposed to the exploitation stress. Aside from the impact of exploitation, deformations of the support system are negligible, despite the fact that the tensile forces acting on the rock bolts can reach values of up to 160 kN. Under favorable geological and mining conditions, support system frames can be spread up to 1.5 m apart when using rock bolts between them. The conducted measurement of convergence during a three year period revealed a compression amounting to a few centimeters. The results obtained by the research fully confirm the effectiveness of combined yielding steel arch with rock bolt support systems under different mining conditions.

An analysis of the transport properties and mechanical stability of rapidly solidified Al-Sb alloy

2015 ◽  
Vol 10 (2) ◽  
pp. 2663-2681
Author(s):  
Rizk El- Sayed ◽  
Mustafa Kamal ◽  
Abu-Bakr El-Bediwi ◽  
Qutaiba Rasheed Solaiman
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Melt Spinning ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
Microstructural Analysis ◽  
Alloy System ◽  
Antimony Content ◽  
The Stability ◽  
Rapidly Solidified

The structure of a series of AlSb alloys prepared by melt spinning have been studied in the as melt–spun ribbons  as a function of antimony content .The stability  of these structures has  been  related to that of the transport and mechanical properties of the alloy ribbons. Microstructural analysis was performed and it was found that only Al and AlSb phases formed for different composition.  The electrical, thermal and the stability of the mechanical properties are related indirectly through the influence of the antimony content. The results are interpreted in terms of the phase change occurring to alloy system. Electrical resistivity, thermal conductivity, elastic moduli and the values of microhardness are found to be more sensitive than the internal friction to the phase changes. 

Effect of the surface chemistry on the stability and mechanical properties of the Zirconia-Hydroxyapatite bioceramic

2021 ◽  
Vol 23 ◽  
pp. 100980
Author(s):  
M. Es-saddik ◽  
S. Laasri ◽  
M. Taha ◽  
A. Laghzizil ◽  
A. Guidara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Chemistry ◽  
The Stability

scholarly journals Studies on the Volumetric Stability and Mechanical Properties of Cement-Fly-Ash-Stabilized Steel Slag

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 495
Author(s):  
Mingkai Zhou ◽  
Xu Cheng ◽  
Xiao Chen
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Steel Slag ◽  
Critical Issue ◽  
Expansion Behavior ◽  
Strength Tests ◽  
Road Materials ◽  
Base Course ◽  
The Stability ◽  
Aggregate Base

The stability of steel-slag road materials remains a critical issue in their utilization as an aggregate base course. In this pursuit, the present study was envisaged to investigate the effects of fly ash on the mechanical properties and expansion behavior of cement-fly-ash-stabilized steel slag. Strength tests and expansion tests of the cement-fly-ash-stabilized steel slag with varying additions of fly ash were carried out. The results indicate that the cement-fly-ash-stabilized steel slag exhibited good mechanical properties. The expansion rate and the number of bulges of the stabilized material reduced with an increase in the addition. When the addition of fly ash was 30–60%, the stabilized material was not damaged due to expansion. Furthermore, the results of X-CT, XRD and SEM-EDS show that fly ash reacted with the expansive component of the steel slag. In addition, the macro structure of the stabilized material was found to be changed by an increase in the concentration of the fly ash, in order to improve the volumetric stability. Our study shows that the cement-fly-ash-stabilized steel slag exhibits good mechanical properties and volumetric stability with reasonable additions of fly ash.

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