scholarly journals A design procedure for evaluation and prediction of in-situ cemented backfill performance

2021 ◽  
pp. 227-233
Author(s):  
Xiaoming Wei ◽  
Lijie Guo
Keyword(s):  
Design Procedure ◽  
Cemented Backfill

scholarly journals Underground Cemented Backfill, a Design Procedure for an Integrated Mining Waste Management.

2018 ◽  
Vol 149 ◽  
pp. 02086
Author(s):  
KHALDOUN Abdelhadi ◽  
OUADIF Latifa ◽  
BAHI Lahcen ◽  
BABA Khadija
Keyword(s):  
Experimental Testing ◽  
Chemical Properties ◽  
Design Procedure ◽  
Binder Content ◽  
Cemented Backfill ◽  
Hydraulic Binder ◽  
Definition Of ◽  
Physical And Chemical ◽  
Operation Cost ◽  
And Chemical Properties

From several case studies around the world, it is well known that the binder represents the major part of backfilling operation cost. Therefore, in the case of Imiter operation, research were mainly focused on the optimization of binder content. To this end, the definition of the physical and chemical properties of the future formula ingredients, specifically: tailings, waste material and hydraulic binder, was necessary. Analytical verifications were conducted to predict the UCB mechanical strength according to the defined underground functions and delivery network. Experimental testing, including: uniaxial compression, Immediate Bearing Index (IBI) and slump test, were then conducted to evaluate the possibility of reaching the required strength with the selected materials. The obtained results show that the tailings and mining wastes can be used as backfilling material with a specific binder content depending on each underground application. The followed approach can be applied for a prefeasibility evaluation for a backfilling facility.

scholarly journals Underground Cemented Backfill, a Design Procedure for an Integrated Mining Waste Management.

2018 ◽  
Vol 149 ◽  
pp. 02086
Author(s):  
KHALDOUN Abdelhadi ◽  
OUADIF Latifa ◽  
BAHI Lahcen ◽  
BABA Khadija
Keyword(s):  
Waste Management ◽  
Design Procedure ◽  
Mining Waste ◽  
Cemented Backfill

Design and Performance of a Modified Buckle Transducer for the Measurement of Ligament Tension

1986 ◽  
Vol 108 (2) ◽  
pp. 149-152 ◽  
Author(s):  
D. Barry ◽  
A. M. Ahmed
Keyword(s):  
Design Procedure ◽  
In Situ Measurement ◽  
Performance Characteristics ◽  
Confined Spaces ◽  
Simultaneous Measurements ◽  
Ligament Tension ◽  
And Performance ◽  
Basic Features ◽  
Reduced Risk

The basic features of a modified buckle transducer for the direct in-situ measurement of tension in ligamentous or tendonous tissues are described. The slender shape of the modified design allows measurement in ligaments located in confined spaces with reduced risk of physical interference between the transducer and adjacent bony structures. In addition, simultaneous measurements in different fiber groups of the same ligament are made convenient. The design procedure of the proposed transducer and its performance characteristics are described.

Experimental parametric study on the in-plane stiffness of wood diaphragms

2002 ◽  
Vol 29 (4) ◽  
pp. 554-566 ◽  
Author(s):  
Andre Filiatrault ◽  
David Fischer ◽  
Bryan Folz ◽  
Chia-Ming Uang
Keyword(s):  
Parametric Study ◽  
Design Procedure ◽  
Shear Stiffness ◽  
Experimental Results ◽  
Flexural Stiffness ◽  
Static Tests ◽  
Wood Floor ◽  
Structural Configurations ◽  
Wooden Structures

This paper presents the results of in situ quasi-static tests on a full-scale wood floor diaphragm in a two-storey woodframe house. The main objective of the study was to investigate the in-plane flexibility/rigidity of the diaphragm. Fourteen different diaphragm and structural configurations were investigated. The main parameters considered in the study included the nail schedule, panel-edge blocking, sub-floor adhesive, perpendicular walls above and below the diaphragm, and wall finish materials. The results indicated that panel-edge blocking increased significantly the diaphragm shear stiffness, particularly for diaphragms without sub-floor adhesive. Also, the presence of perpendicular walls acting as additional chord members caused a significant increase in the flexural stiffness of the diaphragm. The design procedure included in the Uniform Building Code (UBC) to compute in-plane diaphragm deformations was assessed by comparing its predictions with the experimental results. The UBC predictions agreed well with the experimental results for some configurations, but the correlation was poor for others.Key words: diaphragms, floor, tests, wood, wooden structures.

Hot In-Place Recycling of Asphalt Pavements: Oregon Experience

1996 ◽  
Vol 1545 (1) ◽  
pp. 113-119 ◽  
Author(s):  
David F. Rogge ◽  
Walter P. Hislop ◽  
Richard L. Dominick
Keyword(s):  
Design Procedure ◽  
Project Selection ◽  
Lessons Learned ◽  
Mix Design ◽  
Asphalt Pavements ◽  
Ride Quality ◽  
Department Of Transportation ◽  
Suitable Candidate

A study was carried out to evaluate the potential of using hot in-place recycling (HIR) as a rehabilitation alternative in Oregon. Data from six Oregon Department of Transportation HIR projects constructed in 1992–1993 were analyzed. The construction equipment, pavement properties, project selection, mix design, and resulting performance are summarized and presented. Only one HIR project was successful in rejuvenating the pavement and restoring ride quality. Of particular interest are the problems encountered in the other projects, which are discussed and show the importance of preliminary engineering and project selection for successful HIR. The lessons learned from the six projects are used as guidelines for selecting suitable candidate pavements for HIR. The results from the HIR projects combined with a literature review and limited laboratory testing led to a recommended HIR mix design procedure. Significant findings include the following: (a) HIR is a developing technology that shows promise for properly selected projects, (b) project selection is the most critical step in the HIR process, and (c) critical mix design inputs come from testing in situ pavement properties and laboratory specimens remolded with rejuvenating agent added.

Towards more accurate design and specification of aeration systems using on-site column testing

2012 ◽  
Vol 66 (3) ◽  
pp. 627-634 ◽  
Author(s):  
Diego Rosso ◽  
Lu-Man Jiang ◽  
David M. Hayden ◽  
Paul Pitt ◽  
Charles S. Hocking ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Design Procedure ◽  
Safety Factors ◽  
Site Specific ◽  
New Approach ◽  
Column Testing ◽  
Accurate Design ◽  
Technical Structure ◽  
Aeration Performance

Fine-pore diffuser systems are selected for their potential energy efficiency, and during design their propensity for fouling and for an increase in pressure drop with time must be considered. Both fouling and pressure-drop increase cause an increase in blower power requirements. This paper presents a new approach to improve this design procedure, without altering the technical structure of the classical approach. While the administrative and bidding milestones are being carried out (i.e., in the first 6 months of the project milestones), an independent aeration team can test candidate diffusers suitable for design in an aeration column in situ. An extended fouling test in the plant's aeration tanks allows the collection of site-specific aeration performance data. These improve the accuracy of the design process, and limit the reliance on safety factors.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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