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Design Of Concrete Structures

박응격 저, 「行政學講義」(서울 : 박영사, 1993)

Cemented paste backfill (CPB) is accepted as the optimal backfilling material for many underground mines. However, the lack of in-stope backfill pressure data poses fundamental problems from both operational and research standpoints. In response to the requirement for in situ data, a comprehensive field instrumentation project has been conducted. Results are presented here for two stopes at the Cayeli Mine, where geotechnical instruments were installed at the barricades and throughout the stopes. Measurements from a large (slow rise rate) stope with high binder content CPB demonstrated a rapid departure from hydrostatic loading, resulting in relatively low barricade pressures. Conversely, data from a smaller (fast rise rate) stope with lower binder content CPB demonstrated that when cement hydration is retarded, high barricade pressures occur. These examples illustrate the relationship between CPB rise rate and the moderating effect of cement hydration on in situ pressures, which ultimately control barricade pressures. Once CPB gains shear strength, arching of pressures occurs. In situ pressures were reduced with proximity to stope walls and further, under stope access brows, demonstrating that barricade location influences barricade loads. The application of real-time pressure monitoring of pastefill barricades has been demonstrated as an important tool in optimizing operational backfilling efficiency.

In situ measurements of cemented paste backfill at the Cayeli Mine

Finite elements in the analysis of pressure vessels and piping, an addendum: A bibliography (2001–2004)

Butt fusion is an effective method for joining high-density polyethylene (HDPE) pipe on job sites. However, there is lack of quantitative methods to evaluate pipe joint quality. The objective of th...

/pdf/effect-of-joint-contamination-on-the-quality-of-butt-fused-3ciibf372g.pdf

Effect of joint contamination on the quality of butt-fused high-density polyethylene (HDPE) pipe joints

Rehabilitation of a watermain by grouted sliplining is usually carried out when the existing pipe is only partially deteriorated. Although designs that neglect the structural contributions from the existing pipe and the grout are generally conservative, the performance of the rehabilitated pipe needs to be better understood for effective design and management of buried water pipes. Presented in this paper is a practical method for the determination of load sharing and circumferential stresses in a sliplined pressure pipe. The laboratory tests show that the load carrying capacity of a cast iron pipe increases substantially after it is sliplined and grouted. Results also indicate that the eccentricity between the host pipe and the inserted pipe and the direction of eccentricity have an impact on the rupture load of the sliplined pipe. The effects of the host pipe wall thickness and the grout strength are also discussed. Although the method is based on a pressurized watermain, it can be used to assess the lo...

Structural performance of sliplined watermain

Vibrating-wire earth pressure cells are often used to measure soil pressure in fills and embankments or contact pressure between soil and buried structures. Instrumentation companies provide each c...

/pdf/the-influence-of-temperature-on-earth-pressure-cell-readings-16pfugxagx.pdf

The influence of temperature on earth pressure cell readings

This paper describes the thermal performance of different configurations of trenches using various trench geometries and backfill and insulation materials. A limited number of laboratory tests were conducted to confirm the thermal properties of the backfills reported in the literature. The frost protection of water service is measured in terms of the number of days it takes for the frost front to reach the depth of water service lines under sustained subzero surface temperatures. The study specifically included typical granular materials used within the City of Ottawa (formerly the Region of Ottawa-Carleton), but the findings can be equally applied to other urban areas in Canada where the surficial terrain is rocky. The thermal analyses of the trenches were conducted using the finite element method that appropriately represents phase changes when the temperature falls below the freezing point of water. The analyses indicate that the use of sandwich insulation is ineffective, and that latent heat of backfi...

Thermal performance of trench backfills used for frost protection of water service lines

The exterior beads formed during a butt fusion process were used for non-destructive testing of the quality of butt-fused HDPE pipe joints. This innovative concept was tested using a dimensionless quality parameter that is based on tensile energy to break (TEB) values obtained from tensile testing of both the bead and joint specimens. The results show an r2 of 0·87 for a linear regression between these two sets of specimens, which supports the hypothesis that the external bead squeezed out of a butt-fused joint can be used to test the quality of the joint itself. Statistical analysis was carried out to determine the effects of other tested parameters. Furthermore, four distinct failure modes have been identified and a quality test protocol using the quality parameter is proposed.

/pdf/innovative-approach-to-testing-the-quality-of-fusion-joints-2k2ozw31gf.pdf

Jack Q. Zhao

Papers

Effect of joint contamination on the quality of butt-fused high-density polyethylene (HDPE) pipe joints

Structural performance of sliplined watermain

The influence of temperature on earth pressure cell readings

Thermal performance of trench backfills used for frost protection of water service lines

Innovative approach to testing the quality of fusion joints