The Study of the Triaxial Rheological Test of the Argillaceous Siltstone in Malin Mine

2012 ◽  
Vol 446-449 ◽  
pp. 2125-2131 ◽  
Author(s):  
Qi Shu Bai ◽  
Yuan You Xia ◽  
Xin Xi Liu ◽  
Zi Han Yang
Keyword(s):  
Coal Industry ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Creep Characteristics ◽  
Reasonable Evidence ◽  
Roadway Support ◽  
The Stability ◽  
Argillaceous Siltstone ◽  
Rheological Test ◽  
The Relationship

Abstract. Coal being one of the main energy resources in China. Coal industry plays an important role in the domestic economy. Roadway support is a key technology in coal mining, and the mechanical properties of surrounding rock directly affect the stability of roadways and their supporting structure. In order to solve the problem of gateway support for C8 coal seam, In terms of the rheological data got from the argillaceous siltstone samples and the influence that loading history has on rock deformation, it employs Burgers model to reflect the creep characteristics of rock. The analytical results demonstrate that the creep test curves of rock sample basically tallies with the theoretical curves and Burgers clearly describes the creep characteristics of rocks. The relationship between surrounding rock stress and surrounding rock deformation provides roadway support with reasonable evidence.

Coal Seam Roadway Bolt Support Design Method Based on the Supporting Theory of Broken Rock Zone

2013 ◽  
Vol 734-737 ◽  
pp. 535-539
Author(s):  
Hai Yuan Liu ◽  
Zhi Gang Wang ◽  
Ji Li ◽  
Lang Bai
Keyword(s):  
Theoretical Foundation ◽  
Design Method ◽  
Field Application ◽  
Surrounding Rock ◽  
Support Design ◽  
Roadway Support ◽  
The Stability ◽  
Comprehensive Classification ◽  
Classification Index ◽  
Surrounding Rock Deformation

broken rock zone is the main reason for the convergence of surrounding rock deformation, and its thickness not only is a reflection of many factors which influence the stability of surrounding rock, but also is the results of the interaction of many factors, a comprehensive classification index. Roadway support design based on classification result of broken rock zone, has a solid theoretical foundation, and the field application effect is remarkable.

scholarly journals The Research on Stability of Surrounding Rock in Gob-side Entry Driving in Deep and Thick Seam

2021 ◽  
Author(s):  
jianjun SHI ◽  
Feng Jicheng ◽  
Peng Rui ◽  
Zhu Quanjie
Keyword(s):  
Stability Study ◽  
Surrounding Rock ◽  
Support Pressure ◽  
Thick Coal Seam ◽  
Thick Seam ◽  
Working Face ◽  
Pressure Area ◽  
Roadway Support ◽  
The Stability ◽  
Bolt Steel

Abstract The gob-side entry driving is driving in low pressure area, which bears less support pressure and is easy to maintain, so it is widely used. Taking the gob-side entry driving in thick coal seam of Dongtan Coal Mine as an example, the reasonable size of pillar and the section of roadway are numerically simulated by combining numerical with measurement, and the roadway support is designed. According to the distribution of lateral stress in working face, eight pillars of different sizes are designed. By simulating and comparing the stress distribution of surrounding rock and the development range and shape of plastic zone in different positions, the pillar size of gob-side entry driving is optimized to be 4.5m. According to the results of optimization of roadway section, the section of straight wall semi-circular arch roadway is adopted. According to the analysis, the roadway is supported by bolt + steel mesh + anchor cable. By observing the stability of roadway, it provides experience for the stability study of roadway the gob-side entry driving with small pillar in thick seam.

scholarly journals EFFECT OF BLASTING ON THE STABILITY OF LINING DURING EXCAVATION OF NEW TUNNEL NEAR THE EXISTING TUNNEL

2021 ◽  
Vol 30 (1) ◽  
Author(s):  
Tuan Minh Tran ◽  
Quang Huy Nguyen
Keyword(s):  
Field Data ◽  
Damage Zone ◽  
Field Tests ◽  
Surrounding Rock ◽  
In Situ Test ◽  
The Stability ◽  
Relationship Of ◽  
The Impact ◽  
The Relationship

In recent years, experimental and numerical researches on the effect of blasting pressure on the stability of existing tunnels was widely obtained. However, the effect of the blasting pressure during excavation a new tunnel or expansion old tunnels on an existing tunnel has disadvantages and still unclear. Some researches were carried out to study the relationship of the observed Peak Particle Velocity (PPV) on the lining areas along the existing tunnel direction, due to either the lack of in situ test data or the difficulty in conducting field tests, particularly for tunnels that are usually old and vulnerable after several decades of service. This paper introduces using numerical methods with the field data investigations on the effect of the blasting in a new tunnel on the surrounding rock mass and on the existing tunnel. The research results show that not only predicting the tunnel lining damage zone under the impact of blast loads but also determination peak maximum of explosion at the same time at the surface of tunnel working.

Study and Application of Three-Step Supporting Design Method in Coal Roadway

2013 ◽  
Vol 353-356 ◽  
pp. 252-257
Author(s):  
Ren Liang Shan ◽  
Xiang Song Kong ◽  
Ji Jun Zhou ◽  
Wen Feng Zhao ◽  
Yu Tao ◽  
...  
Keyword(s):  
Design Method ◽  
Surrounding Rock ◽  
Second Step ◽  
Preliminary Design ◽  
The Third ◽  
Coal Roadway ◽  
Roadway Stability ◽  
Simulation Calculation ◽  
Roadway Support ◽  
The Stability

Scientific supporting design is of great significance to ensure coal roadway stability. The three-step supporting design method is put forward for coal roadway support: The first step is preliminary design, determine the range of each supporting parameter according to the theoretical calculation and supporting experiences; the second step is numerical simulation calculation, choose the reasonable one through the comparison of schemes; the third step is field monitoring, verify the scheme applicability. After applying the three-step supporting design method to study 3# coal seam roadway in Guandi mine, the optimal supporting scheme is obtained, and good results of underground roadway are achieved, which ensure the stability of roadway surrounding rock. Meanwhile, some rules are summarized which provide references for future roadway supporting design.

Study of the Trellis Support of Working Face Roadway in Impact Coal Seam

2014 ◽  
Vol 941-944 ◽  
pp. 2558-2564
Author(s):  
Yu Kai Lv ◽  
Cong Jiang ◽  
Yao Dong Jiang
Keyword(s):  
In Situ Stress ◽  
Surrounding Rock ◽  
Mine Pressure ◽  
Working Face ◽  
Coal Bumps ◽  
Roadway Support ◽  
The Stability ◽  
The Impact ◽  
Physical And Mechanical Characteristics

Coal bumps happened many times in mining at No.5 seam of Tangshan coal mine. Strengthen the roadway’s support of working face can effectively reduce disaster losses. With the research background of the 3654 working face, the mine pressure monitoring for the existing support form of roadway has been carried on. Perform a numerical simulation for the original roadway support, base on the in-situ stress and physical and mechanical characteristics of surrounding rock in experimental; study the impact of the stability of roadway’s surrounding rock, while the space change of trellis and change of supporting intensity; optimizing the original support form, so as to maximum reducing the impact of the coal bumps.

Numerical Analysis on Concrete Filled Steel Tube Supports Support Technology of III-Level South Roadway in Yangzhuang Mine

2013 ◽  
Vol 711 ◽  
pp. 385-390
Author(s):  
Hong Ying Zhang ◽  
Xue Bin Li ◽  
Zheng Xing Ma ◽  
Chao Wang ◽  
Zheng Ze Wang
Keyword(s):  
Simulation Analysis ◽  
Steel Tube ◽  
Surrounding Rock ◽  
Support Structure ◽  
Roadway Stability ◽  
Geological Conditions ◽  
Roadway Support ◽  
The Stability ◽  
Supporting Force ◽  
Core Concrete

Combined with engineering conditions of the III-level south roadway of Yangzhuang Mine, the deformation of surrounding rock and mechanical characteristics of support structure is analyzed by FLAC3D numerical simulation when the roadway is supported by CFSTS support program . The results shows that: For the weak mudstone surrounding rock and complex geological conditions, the deformation of surrounding rock is fast, large and unsymmetrical deformation, the bolt-net-shotcrete support is difficult to maintain the roadway stability. the CFSTS used Φ219 ×8mm steel tube filled with C50 core concrete, which provides powerful supporting force combined with other roadway support ways and restrict surrounding rock to the roadway space. By FLAC3D simulation analysis shows, the deformation of surrounding rock is small and support structure is mad good use and keep work, which can maintain the stability of roadway.

scholarly journals Stability of Close Chambers Surrounding Rock in Deep and Comprehensive Control Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Weijian Yu ◽  
Fangfang Liu
Keyword(s):  
Control Method ◽  
Large Diameter ◽  
High Stress ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Control Technology ◽  
Internal Damage ◽  
Anchor Cable ◽  
The Stability ◽  
And Control

The purpose of this paper is to solve the problem that deep and close-distance cavern and roadway group were easily affected by the adjacent chamber or roadway excavation disturbance and low stability and significant deformation of surrounding rock occurred. The stability and control technology of surrounding rock in the main shaft and auxiliary shaft system has been analyzed by the adjacent chamber and roadway group of −850 m level in Qujiang Mine, China, as an engineering background. Firstly, the numerical calculation of the excavation chamber was, respectively, carried out in different ways with the propagation theory of the excavation disturbance wave. The results show that the interaction of adjacent chamber excavation was more intense. When excavated at the same time, there is a large increase in the movement of the sides and the roof-floor of the chamber and roadway. Then, the mechanism of interaction between low-high stress and excavation disturbance was considered, the corresponding control principles were provided, and a set of critical technologies and equipment were designed according to the deformation characteristics of the large deformation soft surrounding rock. Finally, the comprehensive control method was put forward with the water pump house as an example, that is, anchor, metal net, grouting, combined anchor cable and large-diameter anchor cable. And the related support parameters were determined by the internal damage of the surrounding rock chamber. The numerical simulation results show that the surrounding rock deformation of the chamber and roadway reduced with the revised support program, which the expansion of the rock mass loose circle prevented effectively. The site test shows that the convergence rate of surrounding rock with the improved support was less than 0.2 mm/d, and the rock deformation of chamber and roadway suppressed significantly.

scholarly journals Failure Mechanism for Surrounding Rock of Deep Circular Roadway in Coal Mine Based on Mining-Induced Plastic Zone

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Yue Yuan ◽  
Weijun Wang ◽  
Shuqing Li ◽  
Yongjian Zhu
Keyword(s):  
Plastic Zone ◽  
Failure Mechanism ◽  
Coal Mine ◽  
Surrounding Rock ◽  
Deformation And Failure ◽  
Uniformity Coefficient ◽  
Shape Coefficient ◽  
The Stability ◽  
The Relationship

In order to reveal the failure mechanism of the deep roadway under mining-induced pressure in coal mine, the boundary equations for the plastic zone around the deep roadway were deduced, and then the evolution laws for morphology of the plastic zone and the relationship between the morphological indexes and the stability of surrounding rock were discussed. The results show that, for the deep roadway, the effect of mining on the plastic zone is more sensitive than that on the shallow one. Even if the changes of mining influence are small, they may also cause extremely serious plastic failure of surrounding rock masses, leading to the sudden instability of the roadway. When the plastic wings of the plastic zone are approximately perpendicular to the roof, floor, or sidewall, the large deformation and failure of the deep roadway are very likely to occur. Compared with the index of the uniformity coefficient, the irregular shape coefficient can be used to better characterize the differences in the plastic zone morphology. Finally, a case study was provided to apply the principles for the formation and extension of a butterfly-shaped plastic zone.

scholarly journals In Situ Monitoring and Numerical Experiments on Vertical Deformation Profiles of Large-Scale Underground Caverns in Giant Hydropower Stations

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hao Wu ◽  
Jian Liu ◽  
Xiaogang Wang ◽  
Lipeng Liu ◽  
Zhenhua Tian
Keyword(s):  
Large Scale ◽  
Surrounding Rock ◽  
In Situ Monitoring ◽  
Rock Deformation ◽  
Vertical Deformation ◽  
Spatial Response ◽  
Underground Caverns ◽  
Hydropower Stations ◽  
The Relationship

Spatial response is a feature of rock deformation in regions surrounding large-scale underground caverns and includes significant vertical components due to the construction method of layered excavation. This vertical response is different to the longitudinal response of excavation deformation surrounding shallow tunnels. The study of longitudinal deformation profiles (LDPs), which describe the spatial response of longitudinal tunnel excavation and surrounding rock deformation, is a mature field. However, there has been no independent discussion of the relationship between vertical excavation and the spatial response of deformation in large-scale underground caverns nor the incremental characteristics of layered excavation. In this paper, we define the attenuation function λ x of unloading strength based on theoretical analyses and numerical simulations. We also propose the concept and form of the vertical deformation profile (VDP) curve for the first time and apply it to the Baihetan and Lianghekou Hydropower Stations. After fitting the complete VDP curve with a Levenberg-Marquardt algorithm, we verify its validity by comparing predicted data with in situ monitoring data. The curve can be used to quantitatively analyze the relationship between layered excavation and incremental deformation of surrounding rock, providing a basis for the rapid evaluation of staged deformation during the excavation of large underground caverns. This study has practical significance for the control of deformation in rock surrounding excavations and decision-making during the construction progress.

Acceleration Discrimination of Stability and Reliability Analysis of Surrounding Rock of Loess Tunnel

2011 ◽  
Vol 105-107 ◽  
pp. 1555-1560 ◽  
Author(s):  
Si Yang Chen ◽  
Zhong Li ◽  
Tian Yu Zhang ◽  
Hua Wen Ou
Keyword(s):  
Stability Analysis ◽  
Reliability Analysis ◽  
Surrounding Rock ◽  
Rock Deformation ◽  
Displacement Method ◽  
Rock Stability ◽  
Stability Of Surrounding Rock ◽  
Forecasting System ◽  
The Stability ◽  
Ultimate Displacement

This paper analyzes the tunnel rock ultimate displacement,proposes using acceleration to determine the tunnel surrounding rock stability.Acceleration compared to determine the stability of surrounding rock ultimate displacement method obtained consistent results.Acceleration improved the ultimate displacement method to determine the shortcomings are difficult to quantify.Acceleration of rock deformation by the positive and negative judgments, rock deformation can clearly reflect the trends and status, you can clearly see which one works in a specific state of rock a dangerous warning signal.With a typical project examples validate the method used to determine the displacement acceleration stability of surrounding rock is accurate, feasible.Research and analysis to help build a tunnel surrounding rock stability analysis of the forecasting system.

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