Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry

Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry

In mine backfill design, the estimation of stress generation from the backfilling material is crucial to ensure the stablity of the underground structure and safety for the underground workers. Under elevation of temperature which may be caused by geothermal gradient and exothermic reaction of cemen...

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主要作者: Ting`, Wee Kiet
格式: Thesis
语言:English
出版: 2019
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TA Engineering (General)
Civil engineering (General)
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id my-unimas-ir.25203
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institution Universiti Malaysia Sarawak
collection UNIMAS Institutional Repository
language English
topic TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
spellingShingle TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
Ting`, Wee Kiet
Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
description In mine backfill design, the estimation of stress generation from the backfilling material is crucial to ensure the stablity of the underground structure and safety for the underground workers. Under elevation of temperature which may be caused by geothermal gradient and exothermic reaction of cement hydration, cemented paste backfill (CPB) was speculated to generate additional stress towards the confined surrounding. This thesis presents a series of experimental work to explain the mechanism of deposition within narrow wall in terms of stress-strain behaviour under thermal alteration. The physical and mechanical properties of the proposed material is studied. A model was designed and developed to investigate the stress-strain-temperature behaviour of CPB that fulfilled the necessary boundary condition to replicate a mining stope. Preliminary tests were conducted on the model to ensure its accuracy. CPB as the primary sample and uncemented paste backfill (UCPB) as control sample were studied regarding their stress-strain behaviour by applying different heating pattern during and after deposition. Both materials experienced thermal expansion when there is gain in temperature. Under semi-confined condition, the material will exert thermal stress onto the adjacent wall. The final stress can be up to 50% greater than the peak stress estimated by conventional theorem upon elevation of temperature by 30 ℃. UCPB and CPB experience different mechanism when there is a change in temperature but generally reflects the behaviour obtained from the full-scale monitoring. The test showed a good correlation with the anomaly observed within full-scale monitoring. Based on the finding, an empirical formulation is established to explain and predict the stress behaviour throughout the slurry-paste deposition.
format Thesis
qualification_level Master's degree
author Ting`, Wee Kiet
author_facet Ting`, Wee Kiet
author_sort Ting`, Wee Kiet
title Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
title_short Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
title_full Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
title_fullStr Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
title_full_unstemmed Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry
title_sort stress-strain-temperature behaviour of deposited cemented slurry
granting_institution Universiti Malaysia Sarawak (UNIMAS)
granting_department DEPARTMENT OF CIVIL ENGINEERING
publishDate 2019
url http://ir.unimas.my/id/eprint/25203/1/TING%20WK.pdf
_version_ 1783728292582391808
spelling my-unimas-ir.252032023-08-21T08:40:38Z Stress-Strain-Temperature Behaviour of Deposited Cemented Slurry 2019-05-27 Ting`, Wee Kiet TA Engineering (General). Civil engineering (General) TN Mining engineering. Metallurgy In mine backfill design, the estimation of stress generation from the backfilling material is crucial to ensure the stablity of the underground structure and safety for the underground workers. Under elevation of temperature which may be caused by geothermal gradient and exothermic reaction of cement hydration, cemented paste backfill (CPB) was speculated to generate additional stress towards the confined surrounding. This thesis presents a series of experimental work to explain the mechanism of deposition within narrow wall in terms of stress-strain behaviour under thermal alteration. The physical and mechanical properties of the proposed material is studied. A model was designed and developed to investigate the stress-strain-temperature behaviour of CPB that fulfilled the necessary boundary condition to replicate a mining stope. Preliminary tests were conducted on the model to ensure its accuracy. CPB as the primary sample and uncemented paste backfill (UCPB) as control sample were studied regarding their stress-strain behaviour by applying different heating pattern during and after deposition. Both materials experienced thermal expansion when there is gain in temperature. Under semi-confined condition, the material will exert thermal stress onto the adjacent wall. The final stress can be up to 50% greater than the peak stress estimated by conventional theorem upon elevation of temperature by 30 ℃. UCPB and CPB experience different mechanism when there is a change in temperature but generally reflects the behaviour obtained from the full-scale monitoring. The test showed a good correlation with the anomaly observed within full-scale monitoring. Based on the finding, an empirical formulation is established to explain and predict the stress behaviour throughout the slurry-paste deposition. Universiti Malaysia Sarawak (UNIMAS) 2019-05 Thesis http://ir.unimas.my/id/eprint/25203/ http://ir.unimas.my/id/eprint/25203/1/TING%20WK.pdf text en validuser masters Universiti Malaysia Sarawak (UNIMAS) DEPARTMENT OF CIVIL ENGINEERING REFERENCES Abdul-Hussain, N., & Fall, M. (2012). Thermo-hydro-mechanical behaviour of sodium silicate-cemented paste tailings in column experiments. Tunnelling and Underground Space Technology, 29, 85-93. Aubertin, M., Li, L., Arnoldi, S., Belem, T., Bussière, B., Benzaazoua, M., & Simon, R. (2003). Interaction between backfill and rock mass in narrow stopes. In: 39th U.S. Rock Mechanics Symposium. Symposium conducted at 12th Panamerican Conference on Soil Mechanics and Geotechnical Engineering, USA, 1157-1164. 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