Study on the Feasibility of the Upward Mining Above the Goaf of the Irregular Roadway Mining Under the Influence of Hard and Thick Strata

2019 ◽  
Vol 37 (6) ◽  
pp. 5035-5043 ◽  
Author(s):  
Li Tang ◽  
Saijiang Liang
Keyword(s):  
Upward Mining

scholarly journals Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study

2018 ◽  
Vol 5 (8) ◽  
pp. 180346 ◽  
Author(s):  
Jinwen Bai ◽  
Guorui Feng ◽  
Shanyong Wang ◽  
Tingye Qi ◽  
Jian Yang ◽  
...  
Keyword(s):  
Coal Seam ◽  
Initial Stress ◽  
Central Region ◽  
Coal Mine ◽  
Mechanical Analysis ◽  
Field Monitoring ◽  
Vertical Stress ◽  
Plastic Damage ◽  
Residual Coal ◽  
Upward Mining

Upward mining of the residual coal seam over an abandoned pillar working is one of the effective measures to alleviate the contradiction between limited resources and increased consumption. Interburden stability over an abandoned pillar working plays a significant role in guaranteeing the safety of upward mining; however, it has not yet been extensively studied and understood. In this study, the vertical stress of the interburden over an abandoned pillar working was first investigated. The mechanical model of the interburden was established and the damage conditions were analysed. Then, the stability of the interburden over 38502 abandoned workings in Baijiazhuang coal mine was determined by mechanical analysis and field monitoring. The results show that: (i) Vertical stress of the interburden over abandoned mining zones is clearly lower than the initial stress, indicating the existence of a de-stressed effect. Moreover, vertical stress of the interburden over residual coal pillars is greater than the initial stress, which is the evidence of a stress concentration effect. (ii) The interburden over an abandoned pillar working should be regarded as an elastic rectangular plate supported by generalized Kelvin bodies in mechanical modelling. (iii) The interburden over abandoned mining zones may experience two damage stages. In the first stage, initial plastic damage appears at the central region of interburden. In the second stage, the plastic damage evolves from the central point to the surrounding areas. (iv) The mechanical analysis and field monitoring both indicate the initial damage occurred at the central region over 38502 abandoned workings in Baijiazhuang coal mine before upward mining. Related rock control measures should be implemented in that region to guarantee the safe mining of the residual coal seam.

Roof Broken Characteristics and Overburden Migration Law of Upper Seam in Upward Mining of Close Seam Group

2019 ◽  
Vol 37 (4) ◽  
pp. 3193-3203 ◽  
Author(s):  
Dezhong Kong ◽  
Shijiang Pu ◽  
Shangshang Zheng ◽  
Chunhua Wang ◽  
Yahui Lou
Keyword(s):  
Migration Law ◽  
Upward Mining

scholarly journals Subsidence control method by inversely-inclined slicing and upward mining for ultra-thick steep seams

2021 ◽  
Author(s):  
Huayang Dai ◽  
Peng Li ◽  
Nurpeissova Marzhan ◽  
Yueguan Yan ◽  
Chongliang Yuan ◽  
...  
Keyword(s):  
Control Method ◽  
Upward Mining

Mechanical Model and Analysis on Movement of Rock Strata between Coal Seams in Pillar Upward Mining of Left-Over Coal

2011 ◽  
Vol 58-60 ◽  
pp. 393-398
Author(s):  
Guo Rui Feng ◽  
Jing Zheng ◽  
Ya Feng Ren ◽  
Cong Ming Zhong ◽  
Li Xun Kang
Keyword(s):  
Differential Equation ◽  
Mechanical Properties ◽  
Partial Differential Equation ◽  
Mechanical Model ◽  
Theoretical Foundation ◽  
Control Measures ◽  
Coal Seams ◽  
Set Up ◽  
Rock Strata ◽  
Upward Mining

Work out control measures for pillar upward mining of left-over coal, in view of coal floor movement, this paper analyzes theoretical foundation and mechanical properties of mechanical model on coal floor movement of rock strata between coal seams in pillar upward mining of left-over coal and presents a simplified corresponding mechanical condition. Taking into the relation between layer movement and time consideration, the PTh model is used to show its rheological properties. By using a two-dimension model, mechanical model of coal floor movement is set up and both ends of cantilever beam are fixed. Finally, subsiding partial differential equation is induced at different districts in pillar upward mining of left-over coal. After solving the equation, prediction model about law of coal floor movement at different districts is gotten in pillar upward mining of left-over coal, which provides a theory basis for further study on upward mining.

scholarly journals Study on Deformation and Failure Characteristics of Surrounding Rock of Overlying Roadway under Upward Mining in the Deep Mine

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Teng-Gen Xiong ◽  
Ju-Cai Chang ◽  
Kai He ◽  
Ya-Feng Su ◽  
Chao Qi
Keyword(s):  
Protective Layer ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Deep Mine ◽  
Composite Failure ◽  
Working Face ◽  
Numerical Simulation Methods ◽  
The Impact ◽  
Two Sides ◽  
Upward Mining

To study the impact of mining of the lower protective layer on the deformation and failure characteristics of the upper roadway, these characteristics of an 879 gas drainage roadway were studied and analyzed during the mining of the II 1051 working face of the Zhuxianzhuang coal mine using similar simulation experiments and numerical simulation methods. The results indicate that with the continuous excavation of the working face, the range of impact of the mining stress gradually spreads and exceeds the level of the roadway. At the present time, the roadway is in a mining stress-rising area. The two sides of the roadway are sheared, and the roof and floor are under tension–shear composite failure. The floor is the most gravely damaged—the depth of its damage is 2.5 m, and the depths of damage on either side and of the roof are approximately 1–2 m. During the advancing process of the working face, the deformation of the roadway increases slowly at first, then increases sharply, and tends to be stable thereafter. The deformation of the floor is the largest, followed by those of the two sides and the roof; the values are 800, 400, and 300 mm, respectively.

scholarly journals Location Selection and Control Technology of New Driving Roadway in Upward Mining Roof

2019 ◽  
Vol 384 ◽  
pp. 012019
Author(s):  
Cong Liu ◽  
Jie Li ◽  
Zhennan Liu ◽  
Pengrui Qiu ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Control Technology ◽  
Location Selection ◽  
And Control ◽  
Upward Mining
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