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Maximising the efficiency of Menard pressuremeter testing in cohesive materials by a cookie-cutter drilling technique

Tolooiyan, A ORCID: 0000-0001-8072-636X, Dyson, AP ORCID: 0000-0002-5353-2962, Karami, M, Shaghaghi, T, Ghadrdan, M and Tang, Z 2021 , 'Maximising the efficiency of Menard pressuremeter testing in cohesive materials by a cookie-cutter drilling technique' , Engineering Geology, vol. 287 , pp. 1-16 , doi: 10.1016/j.enggeo.2021.106096.

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Abstract

Menard pressuremeter testing has been widely used in geotechnical engineering applications for 40 years and is an important technique in determining in-situ horizontal stress distributions. In this study, Menard pressuremeter testing is combined with a “cookie-cutter” insertion technique to determine horizontal stresses for a soft-rock in an operational Australian mine. The method presents an alternative to the Self-Bored Pressuremeter, with cookie-cutter drill rods allowing for sample recovery and further laboratory testing. The method accommodates for the presence of gravel and hard layered materials that present a risk of damage to cutting shoes of Self-Bored Pressuremeter devices. The combination of a sonic drill rig, coupled with the cookie cutter rods produces a close tolerance pocket resulting in “pseudo self boring pressuremeter tests”. The undrained shear strength, unload-reload shear modulus and in-situ horizontal stress are presented from pressuremeter tests conducted in the region for the first time. The undrained shear strength was observed in the range of 0.47–0.57 MPa, the unload-reload shear modulus between 17.43 and 18.25 MPa, the lift-off pressure in the range of 0.35–0.61 MPa. The K0 of coal was equal to 1, with interseam materials ranging from 2.1 to 3.5. Results of the cookie-cutter insertion method are compared with conventional drilling methods, with the cookie-cutter insertion test providing results in good agreement with both advanced triaxial laboratory tests and FEM numerical analysis. Cookie-cutter pressuremeter tests were conducted on cohesive soils at Australia's second-largest open-pit mine, with pressuremeter test results presented for Victorian brown coal for the first time.

Item Type: Article
Authors/Creators:Tolooiyan, A and Dyson, AP and Karami, M and Shaghaghi, T and Ghadrdan, M and Tang, Z
Keywords: pressuremeter test, in-situ stress, soft rock, Victorian brown coal, cohesive soil, cookie-cutter
Journal or Publication Title: Engineering Geology
Publisher: Elsevier Science Bv
ISSN: 0013-7952
DOI / ID Number: 10.1016/j.enggeo.2021.106096
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© 2021 Elsevier B.V. All rights reserved.

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