Mechanical Properties of Reconstituted Australian Black Coal

Jasinge, Dileeka; Ranjith, P.G.; Choi, Sing-Ki Xavier; Kodikara, Jayantha; Arthur, Maclean; Li, Hong H

doi:10.1061/(asce)gt.1943-5606.0000010

Cited by 33 publications

(18 citation statements)

References 12 publications

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“…Hence, a novel method was developed, comprising direct shear testing of reconstituted tunnelling rock spoils. Reconstitution of rock fragments has been performed successfully by Jasinge et al (2009) on Australian black coal, to allow for subsequent testing of the reconstituted material. In the current study, the reconstitution of the microtunnelling spoils would allow for the re-creation of the intensely fractured Tuang Formation, which is also characterised by irregularly sorted rocks with arbitrary joints (Tan, 1993).…”

Section: Development Of Tangential Rock Strength Parametersmentioning

confidence: 99%

Impact of highly weathered geology on pipe-jacking forces

Choo

Ong

2017

Geotechnical Research

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, Malaysia, 7·7 km of trunk sewer lines were constructed in the highly fractured, highly weathered Tuang Formation using a pipe-jacking method. The pipelines were founded at depths of up to 35 m below Kuching City, where the majority of the pipe-jacking activities would traverse the Tuang Formation. Jacking forces in highly fractured geology are not well understood as most jacking force models were derived for drives traversing soils. Therefore, a novel method was developed, whereby equivalent rock strength characteristics were interpreted from direct shear testing on reconstituted tunnelling rock spoils. Tangential peak strength parameters, c 0 t,p and e 0 t,p , were developed from the nonlinear behaviour of the reconstituted spoils and applied to a wellestablished jacking model to assess arching and development of jacking forces from four documented drives. The backanalysed parameters l avg and r EV were used to demonstrate that geology had significantly affected the development of jacking forces. The back-analysis of the studied drives was successfully validated through finite-element modelling. This research shows that the developed parameters c 0 t,p and e 0 t,p and the back-analysed parameters l avg and r EV can be reliably used to predict jacking forces in highly fractured, highly weathered geology.

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Section: Development Of Tangential Rock Strength Parametersmentioning

confidence: 99%

Impact of highly weathered geology on pipe-jacking forces

Choo

Ong

2017

Geotechnical Research

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“…Samples taken from close proximity in the same seam can have very different properties (Jasinge et al 2009). The complexities of coal arise from its origin.…”

Section: Introductionmentioning

confidence: 98%

“…The properties deemed relevant, however, have depended on the purpose of the study or experiment. Jasinge et al (2009) developed a method of making reconstituted black coal specimens by adding Portland cement as a binder. Specimens were made by compacting the coal:cement mixture in a steel mould.…”

Section: Introductionmentioning

confidence: 99%

Development of a reconstituted brown coal material using cement as a binder

2010

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Like any other coal, the highly heterogeneous nature of brown coal can sometimes make it difficult to interpret the results of laboratory experiments. More homogeneous samples with properties reproducible in the laboratory would provide significant advantage, especially in understanding the effects of various factors in the properties of coal. An attempt was made to develop reconstituted coal (RC) samples in the laboratory through an extensive material development and laboratory testing programme. The latter consisted of mainly uniaxial compression tests. The main objective in developing the RC material is to use it in future research on CO 2 sequestration in unmineable coal seams. A highly homogeneous coal sample would make it much easier to identify, for example, the effect of CO 2 sorption on the mechanical, flow and transport properties of coal. Uniaxial compression tests were conducted on some brown coal samples to determine the approximate mechanical properties. The results revealed an average uniaxial compressive strength of 1.46 MPa, an average elastic modulus of 77.43 MPa and a Poisson's ratio of 0.16. The measured properties were used as a reference for the development of RC samples. An extensive laboratory experimental programme was conducted to develop RC samples with the desirable mechanical properties. Portland cement was used as the cementing agent for the RC. Different variables such as percentage of cement, water content, compaction load and curing time were taken into account when developing RC samples. Uniaxial compression tests were carried out to ensure that the RC samples were reasonably homogeneous and the properties were similar to those of natural coal. Percentages of cement by weight of coal such as 4, 6 and 8% were attempted and a 4% cement mix with 50% water was considered most suitable for the RC samples. Average compressive strength of 0.8 MPa (28-day strength) and an average elastic modulus of 34 MPa were achieved for the RC samples. Further efforts at improvement would involve better matching of the uniaxial compressive strength and elastic modulus of RC samples with the natural coal samples.

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“…A number of investigations on the static and dynamic properties of ballasts and the effect of geofabric on rate of ballast degradation rates are well documented (Gentzis, 2007). Studies on the geotechnical properties of coal in relation to engineering applications are also detailed (Indraratna et al, 2006;Jasinge, 2009), but specific attention to wetting effects on stability of stabilized access coal roads have not been investigated in detail. The effects of coal dust fouling on ballast interlocking properties have not been investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Frictional resistance of coal dust fouled uniformly graded aggregates

Okonta¹

2012

Int. J. Phys. Sci.

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Modulus (DSM) of uniformly graded gravel aggregate were investigated. The results show that at increased coal content, the DSFA of the gravel tends to the DSFA of the coal. The rate of decrease of DSFA was dependent on the moisture content of the coal fouled gravel. The DSIFA was higher than the DSFA at any degree of coal fouling. The DSM at small displacement was more sensitive to changes in moisture content of the fouled gravel than friction angles and is thus a better indicator of coal fouling effect.

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Mechanical Properties of Reconstituted Australian Black Coal

Cited by 33 publications

References 12 publications

Impact of highly weathered geology on pipe-jacking forces

Impact of highly weathered geology on pipe-jacking forces

Development of a reconstituted brown coal material using cement as a binder

Frictional resistance of coal dust fouled uniformly graded aggregates

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