Direct Shear Tests on JSC-1A Lunar Regolith Simulant

Iai, Masafumi; Luna, Ronaldo

doi:10.1061/(asce)as.1943-5525.0000082

Cited by 16 publications

(7 citation statements)

References 25 publications

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“…The direct shear test has been used for various studies on soil-structure interfacial friction, ranging from fundamental soil mechanics (Jewell, 1986;Simoni and Houlsby, 2006) to its application on geotechnical engineering problems (Arulrajah et al, 2013;Iai and Luna, 2011;Kulhawy and Mayne, 1990). The suitability of using a direct shear test for investigating jacking forces was demonstrated by Staheli (2006), who conducted direct shear testing of sand-pipe interfaces, based on a customised shear box developed by Iscimen (2004).…”

Section: Previous Studies On Jacking Forcesmentioning

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: Previous Studies On Jacking Forcesmentioning

confidence: 99%

Impact of highly weathered geology on pipe-jacking forces

Choo

Ong

2017

Geotechnical Research

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“…The direct shear test has been used to determine shear strength properties of various soilstructure interfaces. Such applications of direct shear testing range from fundamental studies on the effects of dilatancy (Simoni and Houlsby, 2006), particle size (Yu et al, 2006) and shear box platen fixities (Jewell, 1986) to field applications including skin friction generated between various construction materials (Potyondy, 1961), geosynthetic-reinforced structures (Anubhav and Basudhar, 2013;Arulrajah et al, 2013), large-scale hydropower projects, and excavations of lunar regoliths (Iai and Luna, 2011). Direct shear tests can be conducted under conditions of constant normal load (CNL), constant normal stiffness (CNS), or constant volume (CV) (Pellet and Keshavarz, 2014).…”

Section: Direct Shear Testingmentioning

confidence: 99%

Evaluation of Pipe-Jacking Forces Based on Direct Shear Testing of Reconstituted Tunneling Rock Spoils

Choo

Ong

2015

J. Geotech. Geoenviron. Eng.

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The installation of underground trunk sewer lines in the Tuang Formation of Kuching City, Malaysia utilized trenchless technology in the form of the pipe-jacking method. The evaluation of pipe-jacking forces mainly involves empirical models developed for soils, with rather limited considerations for drives through weathered rock. Therefore, a novel approach is proposed to evaluate strength parameters by reconstituting and subsequently shearing scalped tunneling rock spoils in the direct shear apparatus. The direct shear results are then applied to a well-established pipe-jacking force model, which considers arching theory. The outcomes indicate that the back-analyzed frictional coefficients, µ avg are not only reliable but also related to their surrounding geologies due to soil-structure interaction. This study also highlights the significance of lubrication and effect of rock arching in assessing jacking forces. The successful characterization of reconstituted tunneling rock spoils in this paper has shown potential use in assessing jacking forces during micro-tunneling works.

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“…The regolith taken from multiple sites of the Apollo 12 and 14 missions, as well as other missions, had a median grain size of 0.05 mm to 0.735 mm and went as low as 40 mm [2,15,16]. This means the powders could be sieved to the sized used in this experiment without any extra processing.…”

Section: Resultsmentioning

confidence: 99%

“…NASA and other space organizations around the world have been trying to develop technology in order to make the idea of creating settlements on the moon a reality [1,2]. In order to make this idea feasible, large structural components must be able to be made by utilizing in situ resources such as lunar soil.…”

Section: Introductionmentioning

confidence: 99%