Failure Reasons and Support Countermeasure of Intersecting Roadwayss in Deep Soft Rock

2013 ◽  
Vol 275-277 ◽  
pp. 2740-2743
Author(s):  
Jing You Yin ◽  
Er Qiang Li ◽  
Jia Wei Liu
Keyword(s):  
Soft Rock ◽  
Stability Control ◽  
Impact Factors ◽  
Underground Engineering ◽  
Deformation And Failure ◽  
Engineering Construction ◽  
Roadway Stability ◽  
Characteristics Analysis ◽  
Soft Rock Roadway ◽  
The Impact

In mining engineering construction, more and more involved in deep soft rock roadway stability control problem, also encountered deep soft rock underground engineering intersection problem, but its classification and support measures are far from perfect and systematic. This paper begins with a brief deep soft rock mine intersection classification, then summarize the deformation and failure characteristics, analysis of the impact factors and the reasons of its destruction, for roadway intersection supporting method is recommended.

Investigation on Deformation and Failure Characteristics and Stability Control of Soft Rock Roadway Surrounding Rock in Deep Coal Mine

2011 ◽  
Vol 255-260 ◽  
pp. 3711-3716 ◽  
Author(s):  
Ju Cai Chang ◽  
Guang Xiang Xie
Keyword(s):  
Coal Mine ◽  
Plastic Region ◽  
Soft Rock ◽  
Stability Control ◽  
Surrounding Rock ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Deep Coal Mine ◽  
Soft Rock Roadway ◽  
Rock Roadway

Numerical simulation and field measurement were carried out to investigate into laws of deformation and movement and the evolving characteristics of the plastic region around the roadway based on engineering conditions of deep soft rock roadway in Wangfenggang colliery, Huainan Mining area. The mechanism of controlling the surrounding rock stability of soft rock roadway in deep coal mine was demonstrated. The supporting of soft rock roadway in deep coal mine must be compatible with deformation and failure characteristics of surrounding rock, and it can keep the stability of surrounding rock. The combined supporting with high strength and prestress bolting-anchoring and integral surrounding rock grouting reinforcement can effectively control the surrounding rock deformation of soft rock roadway in deep coal mine. But every working step must be pay attention to sequence on the time and space so that it can play an integral supporting effect. Research results are put into practice accordingly and good control effect has been achieved.

Deformation Failure Analysis and Stability Control Technology of Large Section Soft Rock Chamber in Deep Coal Mine

2013 ◽  
Vol 353-356 ◽  
pp. 1035-1039
Author(s):  
Chang Hui An ◽  
Gui Bin Zhang ◽  
Zhi Da Liu ◽  
Kai Zhao ◽  
Wei Guo ◽  
...  
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Stability Control ◽  
Surrounding Rock ◽  
Mine Safety ◽  
Large Section ◽  
Deformation And Failure ◽  
Deep Coal Mine ◽  
Ground Pressure ◽  
The Impact

The chambers of certain coal mine in Shandong such as central substation situate in soft rock which consists of mudstone and fine sandstone, etc. Obvious ground pressure behaviors, large deformation and failure of surrounding rock have serious effect on mine safety production, with the impact of various complicated deep large ground pressure. This paper presents a rational scheme to control the surrounding rock steadily, based on analysis of deformation and failure on large section soft rock chamber, combined with the concept of the" combined supporting technology of long and short anchors" and "the combined supporting technology of three anchors".

scholarly journals Research on Supporting Method for High Stressed Soft Rock Roadway in Gentle Dipping Strata of Red Shale

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 423
Author(s):  
Chunde Ma ◽  
Jiaqing Xu ◽  
Guanshuang Tan ◽  
Weibin Xie ◽  
Zhihai Lv
Keyword(s):  
Failure Process ◽  
High Stress ◽  
Soft Rock ◽  
In Situ Stress ◽  
Mechanical Parameters ◽  
Deformation And Failure ◽  
Deep Mine ◽  
Plastic Energy ◽  
Roadway Stability ◽  
Phosphate Mine

Red shale is widely distributed among the deep mine areas of Kaiyang Phosphate Mine, which is the biggest underground phosphate mine of China. Because of the effect of various factors, such as high stress, ground water and so on, trackless transport roadways in deep mine areas were difficult to effectively support for a long time by using traditional supporting design methods. To deal with this problem, some innovative works were carried out in this paper. First, mineral composition and microstructure, anisotropic, hydraulic mechanical properties and other mechanical parameters of red shale were tested in a laboratory to reveal its deformation and failure characteristics from the aspect of lithology. Then, some numerical simulation about the failure process of the roadways in layered red shale strata was implemented to investigate the change regulation of stress and strain in the surrounding rock, according to the real rock mechanical parameters and in-situ stress data. Therefore, based on the composite failure law and existing support problems of red shale roadways, some effective methods and techniques were adopted, especially a kind of new wave-type bolt that was used to relieve rock expansion and plastic energy to prevent concentration of stress and excess deformation. The field experiment shows the superiorities in new techniques have been verified and successfully applied to safeguard roadway stability.

Creep Characteristics Analysis of Oil Shale and its Application

2010 ◽  
Vol 29-32 ◽  
pp. 2614-2619 ◽  
Author(s):  
Jun Guang Wang ◽  
Bing Liang
Keyword(s):  
Oil Shale ◽  
Stability Control ◽  
Creep Model ◽  
Test Results ◽  
Creep Properties ◽  
Creep Stage ◽  
Creep Characteristics ◽  
Roadway Stability ◽  
Theoretical Significance ◽  
Characteristics Analysis

to study oil shale creep properties, we use rock SJ-1B three-axis creep instrument on oil shale to carry three axis creep test. Through test results, the creep of oil shale is nonlinear, and in accelerating creep stage oil shale injury increased dramatically. Using Burgers creep model introduced damage variable to analyse the oil shale surrounding stress and displacement field and Systematically analyse the creep properties under various support intensity. So it has important theoretical significance and value for the oil shale resource development and roadway stability control.

Soft Rock Roadway Mesh Shell Lining Experimental Study of the Mechanical Properties

2013 ◽  
Vol 671-674 ◽  
pp. 774-777 ◽  
Author(s):  
Hong Xia Li ◽  
Yong Wei Wang ◽  
Bai Xiao Tang
Keyword(s):  
Mechanical Properties ◽  
Soft Rock ◽  
Confining Pressure ◽  
Test Results ◽  
Underground Engineering ◽  
High Level ◽  
Theoretical Test ◽  
Soft Rock Roadway ◽  
Rock Roadway ◽  
Reliable Basis

Similar model experiment under confining pressure, research latticed shell lining the mechanical properties and the carrying capacity of new support for the underground engineering - network shell support, according to the model experiments and theoretical. Test results prove that the the latticed shell supporting structure has good mechanical properties and a high level of support is a reliable form of support. Can make up for the deficiencies of the existing soft rock roadway structure, calculated to provide a reliable basis for mesh shell lining theoretical analysis.

scholarly journals Nonlinear Large Deformation Mechanism and Stability Control of Deep Soft Rock Roadway: A Case Study in China

2019 ◽  
Vol 11 (22) ◽  
pp. 6243 ◽  
Author(s):  
Dong Wang ◽  
Yujing Jiang ◽  
Xiaoming Sun ◽  
Hengjie Luan ◽  
Hui Zhang
Keyword(s):  
Large Deformation ◽  
Coal Mine ◽  
Deformation Mechanism ◽  
Soft Rock ◽  
Stability Control ◽  
Surrounding Rock ◽  
Gansu Province ◽  
Soft Rock Roadway ◽  
Coupling Support ◽  
Rock Roadway

Improving the safety and stability of soft surrounding rock with nonlinear large deformation gives a strong guarantee for the safe mining and sustainable development of deep coal mines. In order to control the nonlinear large deformation of the surrounding rock in a deep soft rock roadway, this paper discusses the nonlinear large deformation mechanism and coupling support countermeasures of a typical engineering application at Xin’an coal mine in Gansu province, China. The series of experiments and theoretical analysis described in this paper reveal the phenomena, properties, and reasons for the nonlinear large deformation of soft surrounding rock in detail. Then, the type of nonlinear large deformation mechanism is determined and transformed from a composite one to a simple one. Based on experimental results and mechanism transformation, a suitable coupling support countermeasure, which contains the Constant Resistance Large Deformation (CRLD) bolt, steel mesh, floor hollow grouting cable, and steel fiber concrete, is proposed to reduce the nonlinear large deformation and the potential risk during mining. The application shows that the coupling support countermeasure can effectively reduce the nonlinear large deformation of the surrounding rock and help to maintain the stability of the deep soft rock roadway at Xin’an coal mine.

scholarly journals Evolution of Interior and Exterior Bearing Structures of the Deep-Soft-Rock Roadway: From Theory to Field Test in the Pingdingshan Mining Area

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4357
Author(s):  
Qingxian Huang ◽  
Xufeng Wang ◽  
Xuyang Chen ◽  
Dongdong Qin ◽  
Zechao Chang
Keyword(s):  
Field Test ◽  
Soft Rock ◽  
Field Measurements ◽  
Mining Area ◽  
Surrounding Rock ◽  
Roadway Stability ◽  
Geological Conditions ◽  
Soft Rock Roadway ◽  
Bearing Structure ◽  
Rock Roadway

Pingdingshan mining area is one of the typical deep mining areas in China, and most of the mines in this area are troubled by the difficulties of the deep-soft-rock roadway support. Based on the concept of synergistic interactions of the interior and exterior bearing structure of the surrounding rock and, considering the specific geological conditions of the research site, we establish the mechanical model of the interior and exterior bearing structure of the roadway. Based on numerical simulation, we reveal the influence of main factors, such as support strength and mechanical characteristics, of surrounding rock on the distribution and evolution of the interior and exterior bearing structure. We found that increasing the support strength and mechanical parameters of surrounding rock can make the exterior bearing structure close to the roadway enhance the bearing characteristics of the interior and exterior bearing structure and improve the roadway stability. The distribution characteristics of the interior and exterior bearing structure of the roadway under six different support strengths and six different grouting parameters were systematically investigated by field measurements. According to the field test results, an effective strategy for controlling the deep-soft-rock roadway is proposed, which provides a good reference for surrounding rock control of the deep-soft-rock roadway in the Pingdingshan mining area and mines with similar mining conditions.

The Coupling Support Technology for Y Style Large Span Intersection in Deep Soft Rock Roadway

2011 ◽  
Vol 199-200 ◽  
pp. 1773-1776 ◽  
Author(s):  
Zhan Jin Li ◽  
Xue Li Zhao ◽  
Yang Zhang
Keyword(s):  
Failure Modes ◽  
Soft Rock ◽  
Theoretical Research ◽  
Deformation And Failure ◽  
Key Technology ◽  
Large Span ◽  
Soft Rock Roadway ◽  
Crossing Point ◽  
Coupling Support ◽  
Rock Roadway

Because of crossing point’s large span, stress concentration clearly, result in parts of the intersection of poor support, construction and maintenance difficult, especially Y-Intersection is more serious part of deformation and failure. Through situ investigation and theoretical research, summarize the typical failure modes of the deep large Y-intersection, analyze the main reasons for destruction of the crossing point that is both sides of Bovine unconstrained and supported respectively. The new coupling supporting design—bolt-mesh-cable + truss to control the top of crossing point , while the key technology of the double control bolt is used to control the Crossing point.—is proposed.

Research on Supporting Techniques of Deep and Large-Section Coal Roadway Blow Thin Fractured Bedrocks

2011 ◽  
Vol 368-373 ◽  
pp. 1078-1083
Author(s):  
Kui Sheng Ma ◽  
Min Song ◽  
Hou Li Fu
Keyword(s):  
Control Mechanism ◽  
Soft Rock ◽  
Stability Control ◽  
Element Analysis ◽  
Scheme Design ◽  
Coal Roadway ◽  
Flac 3D ◽  
The Stability ◽  
Soft Rock Roadway ◽  
Rock Roadway

This paper is basis on previous studies, taking The main haulage roadway of the western district of Zhaogu No.1 mine ,which belongs to Jiaomei group, as the background of study. On the basis of understanding the mechanical properties and engineering characteristics of soft rock, proposing the stability control mechanism and supporting scheme design countermeasure of fractured soft rock roadway. Numerical analysis was made to the stability of roadway surroundings used the FLAC-3D finite element analysis software, and a set of reasonable supporting technology schemes and parameters were proposed.

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