scholarly journals The material ratio of roadside backfill body based on spatiotemporal law of ground pressure: a case study of Xingtai Mine, China

2022 ◽  
Author(s):  
Xinyuan Zhao ◽  
Xinwang Li ◽  
Ke Yang ◽  
Lichao Cheng ◽  
Yiling Qin
Keyword(s):  
Maximum Pressure ◽  
Engineering Practice ◽  
Coal Face ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Ground Pressure ◽  
Supporting Effect ◽  
Optimal Material ◽  
Similar Simulation Test

Abstract The material ratio of the roadside backfill body in gob-side entry retaining determines its mechanical properties, which plays an important role in the supporting effect of the roadway surrounding rock. In this paper, a similar material modeling is used to verify the spatiotemporal law of the ground pressure in the engineering case of dense solid backfilling mining in Xingtai Mine, China. Based on that law, the theoretical requirements for the bearing performance of the roadside backfill body are proposed. Finally, a material ratio that meets the theoretical requirements is obtained by compression test, and the deformation and failure characteristics of the backfill body with this ratio are analyzed. The results show that the maximum pressure of the backfill body measured in Xingtai Mine is 5.5 MPa, which is about 40 m away from the coal face, after 40m, the pressure of the backfill body will not increase anymore. The similar simulation test also proved that the ground pressure behind the coal face increases gradually and tends to be stable during the backfilling process, which shows certain spatiotemporal characteristics. Through the proportioning experiment, it is determined that the optimal material ratio of the roadside backfill body is gangue: fly ash: cement = 10:3:1, which meets the theoretical requirement that the strength of the roadside backfill body at any position is not less than the ground pressure at that position. The research results provide a reference for the engineering practice of gob-side entry retaining in dense backfilling mining.

Research on Supporting Countermeasure of B103W01 Transport Roadway in Shajihai Coal Mine

2013 ◽  
Vol 401-403 ◽  
pp. 2221-2225
Author(s):  
Shu Jiang Zhao
Keyword(s):  
Coal Mine ◽  
Deformation Mechanism ◽  
Soft Rock ◽  
Single Type ◽  
Engineering Practice ◽  
Deformation And Failure ◽  
Constant Resistance ◽  
Supporting Effect ◽  
Deformation Mechanics ◽  
Coupling Support

For the soft rock roadwaysupporting problems, using the conventional methods cannot effectively controlthe deformation and failure. This paper took B103W01 transport gateway projectin Shajihai coal mine as example and analyzed its deformation failure reasonand deformation mechanism and determined the specific measures of transformingcompound mechanism of deformation mechanics into a single type. In the end, weput forward coupling support technology of constant resistance and largedeformation bolt + hollow grouting anchor + corner grouting steel pipe, whichhad been applied to engineering practice. The monitoring results showed thatthe supporting effect was good. So it can be used for reference for the similarconditions of roadway supporting.

Deformation failure characteristics of weathered sandstone strata tunnel: a case study

2021 ◽  
pp. 105565
Author(s):  
Ke Wang ◽  
Shuoshuo Xu ◽  
Yujian Zhong ◽  
Zhilin Han ◽  
Enlin Ma
Keyword(s):  
Failure Characteristics

Service Elicitation Method Using Applied Qualitative Research Procedures

2011 ◽  
pp. 1-17 ◽  
Author(s):  
Ville Alkkiomäki ◽  
Kari Smolander
Keyword(s):  
Qualitative Research ◽  
Research Method ◽  
Systems Development ◽  
Engineering Practice ◽  
Use Case ◽  
Elicitation Method ◽  
Grounded Theory Research ◽  
Service Oriented ◽  
Theory Research

This chapter introduces QSE, the Qualitative Service Elicitation method. It applies qualitative research procedures in service elicitation. Service engineering practice lacks lightweight methods to identify service candidates in projects with tight schedules. QSE provides a systematic method to analyze requirement material in service-oriented systems development with a feasible effort. QSE uses the procedures of the grounded theory research method to elicit service candidates from business process descriptions and business use case descriptions. The chapter describes the method with examples and a case study.

scholarly journals Deformation and failure characteristics of weathered granite under uniaxial compression

AIP Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 075222 ◽  
Author(s):  
Lingfan Zhang ◽  
Duoxing Yang ◽  
Zhonghui Chen
Keyword(s):  
Uniaxial Compression ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Weathered Granite

scholarly journals From Academia to Start-up: A Case Study with Implications for Engineering Education

2014 ◽  
Vol 4 (1) ◽  
pp. 24
Author(s):  
Bill Williams ◽  
José Figueiredo
Keyword(s):  
Knowledge Production ◽  
Critical Analysis ◽  
Qualitative Data ◽  
Engineering Students ◽  
Role Play ◽  
Engineering Practice ◽  
Start Up ◽  
Mode 2

This study uses the characterization of contrasting modes of knowledge production to follow the activity of a group of engineers who migrated from an academic environment to a successful start-up firm. Qualitative data from interviews of two key members of the team were used to characterize their activities in the two settings. The authors relate the engineering practice described in the interviews to the Gibbons Mode 1 and Mode 2 knowledge production phases and note the importance of a phase change in the transition between the two modes. The resultant case-study contributes material for use in role-play activity with engineering students to help develop interdisciplinary skills. The study also presents a critical analysis to evaluate the merits of the Mode 1 and Mode 2 framework for analysis of engineering practice at the level of the firm.

scholarly journals Experimental study on deformation and failure characteristics of discontinuous prefabricated fractured tuff

2019 ◽  
Vol 16 (5) ◽  
pp. 862-874
Author(s):  
Yang Song ◽  
Heping Wang ◽  
Meng Ren
Keyword(s):  
Shear Failure ◽  
Failure Process ◽  
Dissipated Energy ◽  
Uniaxial Compression Test ◽  
Tensile Shear ◽  
Joint Spacing ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Peak Intensity ◽  
Dip Angle

Abstract To study more fully the characteristic law of deformation and failure of tuff jointed rock mass of prefabricated parallel discontinuous joint test specimens, the uniaxial compression test was used. The stress–strain curve, peak intensity, deformation parameters, energy characteristics, etc., of the rock test specimens were systematically studied under different combinations of joint dip angle and joint spacing. The research found that: (1) during the failure process of tuff, the peak intensity and elastic modulus followed a U-shaped change pattern and the minimum value was reached when α = 60°; (2) the fracture modes of test specimens with different joint dip angles were different. When α = 30° and 45°, failure characteristics were mixed modes of tensile or tensile shear failure. When α = 60°, failure characteristics were shear. At α = 75°, the failure characteristic was tensile shear failure. (3) The absorbed and dissipated energy of the rock increased nonlinearly at each stage of deformation. (4) We quantified rock energy damage through a correlation between dissipated energy and absorbed energy of the rock in the process of energy evolution, and obtained an evolution of the relationship between the dissipated energy ratio, crack dip angle and crack spacing. Based on different fracture distribution methods and according to the strain equivalence principle, the constitutive equation of the pre-peak rock damage was obtained.

Mining voids: Extraction and emotion at the Australian coal frontier

Polar Record ◽  
2020 ◽  
Vol 56 ◽  
Author(s):  
Hedda Haugen Askland
Keyword(s):  
Polar Region ◽  
New South ◽  
The Arctic ◽  
Resource Extraction ◽  
Coal Face ◽  
South Wales ◽  
Australian Coal ◽  
Temporal Dimensions ◽  
Social Landscapes

Abstract Wollar is a small village located in the Mid-Western Region in New South Wales, Australia. Geographically removed, climatically different and culturally distinct from the Arctic, it might seem as a distant case for the exploration of Arctic Uchranotopias and resource extraction; the topic of this Special Issue. Yet, the affective and temporal dimensions of mining are not necessarily restricted to distinct regions, and there are theoretical opportunities for cooperative analysis across diverse regions. By bringing forward this case study, I aim to illustrate how the concepts of mining emotions and Uchranotopia have applicability beyond the polar region and how a broader theory of mining emotions may be advanced. Through the notion of “mining voids,” I investigate how discourses of extraction as prosperity clash with lived experiences at the coal face. Mining voids—both present and future—have become markers for physical and social landscapes and, as a metaphor, it embeds the contradiction between utopian narratives of a coal-sponsored future and dystopian imaginings at the coal face. Through analysis of the discourses of mining voids and how, as the voids materialise, emotions are mined, I will tie this case study to the debate of Arctic resource extraction and community making, affect and temporality.

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