A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design of Stable Parallelepiped Coal Pillars Considering Geotechnical Uncertainties
https://orcid.org/0000-0003-3329-0385
Abstract The stability of underground parallelepiped coal pillars formed during trunk road development in inclined coal seams is very important for safe access to the mine workings. These protective coal pillars developed around the trunk roads have the longest life span in coal mines. Although these pillars are designed with high safety factors, their failures continue to occur especially in inclined coal mines. The acute corners of parallelepiped coal pillars are highly stressed and prone to failure. These failures may be attributed to the deterministic safety factor which does not consider field geotechnical uncertainties in their design parameters. This research work identified the geotechnical uncertainties in pillar designs and incorporated them in designing stable pillars in inclined coal seams. A probabilistic approach based on limit state function has been proposed for designing stable parallelepiped coal pillars and validated in an inclined coal mine. In this study, the working stresses of the inclined coal pillars are varied for evaluating their influence on pillar reliability using the three cases of the limit state functions namely, empirical, numerical average, and numerical maximum. The pillar reliabilities were estimated by Monte Carlo Simulation. The results indicate that the empirical and numerical average cases yielded stable pillars, whereas the numerical maximum case provided an unstable design. The correlation between safety factor and reliability has been established which can predict the reliability for a given safety factor of pillars with a similar range of design inputs. Further, the threshold values of pillar sizes, acute corner angles, and seam gradients for the reliable pillar design have been determined by sensitivity analysis. These findings can help in designing stable parallelopiped pillars, especially in inclined coal seams to reduce pillar failures and enhance mine safety.
Highlights Key geotechnical uncertainties in coal pillar stability parameters are identifiedA limit state function-based probabilistic design approach is proposed to include geotechnical uncertainties.The reliabilities of parallelepiped pillars in inclined coal seams are estimated using the Monte Carlo Simulation method.The correlation between pillar reliability and the safety factor of parallelepiped coal pillars is established.Threshold values of design parameters are determined for stable parallelepiped pillars using sensitivity analysis.
Design of Stable Parallelepiped Coal Pillars Considering Geotechnical Uncertainties
https://orcid.org/0000-0003-3329-0385
Abstract The stability of underground parallelepiped coal pillars formed during trunk road development in inclined coal seams is very important for safe access to the mine workings. These protective coal pillars developed around the trunk roads have the longest life span in coal mines. Although these pillars are designed with high safety factors, their failures continue to occur especially in inclined coal mines. The acute corners of parallelepiped coal pillars are highly stressed and prone to failure. These failures may be attributed to the deterministic safety factor which does not consider field geotechnical uncertainties in their design parameters. This research work identified the geotechnical uncertainties in pillar designs and incorporated them in designing stable pillars in inclined coal seams. A probabilistic approach based on limit state function has been proposed for designing stable parallelepiped coal pillars and validated in an inclined coal mine. In this study, the working stresses of the inclined coal pillars are varied for evaluating their influence on pillar reliability using the three cases of the limit state functions namely, empirical, numerical average, and numerical maximum. The pillar reliabilities were estimated by Monte Carlo Simulation. The results indicate that the empirical and numerical average cases yielded stable pillars, whereas the numerical maximum case provided an unstable design. The correlation between safety factor and reliability has been established which can predict the reliability for a given safety factor of pillars with a similar range of design inputs. Further, the threshold values of pillar sizes, acute corner angles, and seam gradients for the reliable pillar design have been determined by sensitivity analysis. These findings can help in designing stable parallelopiped pillars, especially in inclined coal seams to reduce pillar failures and enhance mine safety.
Highlights Key geotechnical uncertainties in coal pillar stability parameters are identifiedA limit state function-based probabilistic design approach is proposed to include geotechnical uncertainties.The reliabilities of parallelepiped pillars in inclined coal seams are estimated using the Monte Carlo Simulation method.The correlation between pillar reliability and the safety factor of parallelepiped coal pillars is established.Threshold values of design parameters are determined for stable parallelepiped pillars using sensitivity analysis.
Design of Stable Parallelepiped Coal Pillars Considering Geotechnical Uncertainties
https://orcid.org/0000-0003-3329-0385
Abstract The stability of underground parallelepiped coal pillars formed during trunk road development in inclined coal seams is very important for safe access to the mine workings. These protective coal pillars developed around the trunk roads have the longest life span in coal mines. Although these pillars are designed with high safety factors, their failures continue to occur especially in inclined coal mines. The acute corners of parallelepiped coal pillars are highly stressed and prone to failure. These failures may be attributed to the deterministic safety factor which does not consider field geotechnical uncertainties in their design parameters. This research work identified the geotechnical uncertainties in pillar designs and incorporated them in designing stable pillars in inclined coal seams. A probabilistic approach based on limit state function has been proposed for designing stable parallelepiped coal pillars and validated in an inclined coal mine. In this study, the working stresses of the inclined coal pillars are varied for evaluating their influence on pillar reliability using the three cases of the limit state functions namely, empirical, numerical average, and numerical maximum. The pillar reliabilities were estimated by Monte Carlo Simulation. The results indicate that the empirical and numerical average cases yielded stable pillars, whereas the numerical maximum case provided an unstable design. The correlation between safety factor and reliability has been established which can predict the reliability for a given safety factor of pillars with a similar range of design inputs. Further, the threshold values of pillar sizes, acute corner angles, and seam gradients for the reliable pillar design have been determined by sensitivity analysis. These findings can help in designing stable parallelopiped pillars, especially in inclined coal seams to reduce pillar failures and enhance mine safety.
Highlights Key geotechnical uncertainties in coal pillar stability parameters are identifiedA limit state function-based probabilistic design approach is proposed to include geotechnical uncertainties.The reliabilities of parallelepiped pillars in inclined coal seams are estimated using the Monte Carlo Simulation method.The correlation between pillar reliability and the safety factor of parallelepiped coal pillars is established.Threshold values of design parameters are determined for stable parallelepiped pillars using sensitivity analysis.
Design of Stable Parallelepiped Coal Pillars Considering Geotechnical Uncertainties
Kumar, Ranjan (author) / Mandal, Prabhat Kumar (author) / Ghosh, Nilabjendu (author) / Das, Arka Jyoti (author) / Banerjee, Gautam (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Uncertainties in Geotechnical Design
| British Library Online Contents | 1995
Geotechnical Uncertainties and Reliability-Based Design
| ASCE | 2013
Geotechnical Aspects of Thousand Pillars Temple at Warangal
| British Library Conference Proceedings | 1990
Assesment of uncertainties in geotechnical design parameters
| British Library Conference Proceedings | 1991
Uncertainties in Geotechnical Data
| Wiley | 2013