Significance of a new preliminary treatment method of the Pen206_18 borehole penetrometer’s pressure readouts for a reliable analysis of rock stress-strain parameters

• Autorzy: Pierszalik Rafał

Identyfikatory

DOI

10.24425/ams.2022.140708

• Języki publikacji: EN

Abstrakty

EN

This article describes some selected aspects of a preliminary treatment of measurement cycle results obtained by a new Pen206_18 type hydraulic borehole penetrometer (a borehole jack type), a tool of an in situ determining of mechanical properties of rocks. The pre-treatment of the measurement cycle results is a necessary step to prepare the data for a following appropriate analysis of stress-strain parameters of rocks. Aforementioned aspects are focused mainly on a pre-treatment of hydraulic pressure readouts. The Pen206_18 type penetrometer is a modified version of a standard Pen206 type penetrometer. The standard version, based on a digital measurement of a critical hydraulic pressure, has been in use in polish hard coal mines for almost 15 years to determine various rock strength parameters. In contrary, the Pen206_18 type penetrometer now provides simultaneous recording of two main measurement cycle parameters (hydraulic pressure and a head pin stroke) during the whole measurement cycle duration. A recent modification of the penetrometer has given an opportunity to look closer at various factors having an influence on the measurement cycle data readouts and, as a consequence, to lay a foundation for a development a new penetrometric method of determining stress-strain parameters of rocks. In this article it was shown that just before a main stage of the measurement cycle, a transitional stage could occur. It complicates a determination of the beginning of an useful set of measurement cycle data. This problem is widely known also in other static in situ methods of determining stress-strain parameters. Unfortunately, none of various known workouts of this problem were sufficiently adequate to the pre-treatment of the penetrometric measurement cycle results. Hence, a new method of determining the beginning of the useful set of pressure readouts has been developed. The proposed method takes into account an influence of an operational characteristics of the measuring device. This method is an essential part of a new pre-treatment procedure of the Pen206_18 measurement cycle’s pressure readouts.

Słowa kluczowe

EN

rock; stress; strain; analysis; penetrometer; jack

PL

penetrometr; skała; zmęczenie

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2022
• Tom: Vol. 67, no. 1
• Strony: 159--178
• Opis fizyczny: Bibliogr. 13 poz., fot., rys., wykr.

Twórcy

autor

Pierszalik Rafał

• Central Mining Institute (GIG), 1 Gwarków Sq., 40-166 Katowice, Poland

• https://orcid.org/0000-0003-2961-6696

Bibliografia

• [1] A. Kidybiński, J. Gwiazda, Z. Hładysz, Ocena mechanicznych własności skał oraz stateczności górotworu hydraulicznym penetrometrem otworowym. Prace Głównego Instytutu Górnictwa, Seria Dodatkowa. Katowice (1976).
• [2] R.E. Goodman, T.K. Van, F.E. Heuze, Measurement of Rock Deformability in Boreholes. In: Proceedings of the 10th U.S. Symposium on Rock Mechanics, University of Texas, Austin, TX, 523-555 (1970).
• [3] ASTM D4971-02, Standard Test Method for Determining the In situ Modulus of Deformation of Rock Using the Diametrically Loaded 76-mm (3-in.) Borehole Jack. ASTM International, West Conshohocken, PA, (2002). DOI: https://doi.org/10.1520/D4971-16.
• [4] R. Pierszalik, S. Rajwa, A. Walentek, K. Bier, 2020. A Pen206 borehole jack suitability assessment for rock mass deformability determination. Arch. Min. Sci. 65 (3), 639-660 (2020). DOI: https://doi.org/10.24425/ams.2020.134135.
• [5] P.H.V. Nguyen, M. Rotkegel, H.D. Van, Analysis of Behaviour of the Steel Arch Support in the Geological and Mining Conditions of the Cam Pha Coal Basin, Vietnam. Arch. Min. Sci. 65 (3), 551-567 (2020). DOI: https://doi.org/10.24425/ams.2020.134134.
• [6] A. Walentek, T. Janoszek, S. Prusek, A. Wrana, Influence of longwall gateroad convergence on the process of mine ventilation network-model tests. International Journal of Mining Science and Technology 29, 585-590 (2019). DOI: https://doi.org/10.1016/j.ijmst.2019.06.013.
• [7] IRB Ogrodzieniec. Penetrometr otworowy typu Pen206. Dokumentacja techniczno-ruchowa + Załącznik A – pulpit Pen206E (2008).
• [8] A. Nierobisz, Oznaczanie własności mechanicznych skał za pomocą hydraulicznego penetrometru otworowego nowej generacji. Górnictwo i Geoinżynieria 34 (2), 491-500 (2010).
• [9] A. Nierobisz, J. Gawryś, K. Bier, Analiza konstrukcji hydraulicznego penetrometru otworowego i jego modernizacja dla zwiększenia zakresu pomiarowego. Przegląd Górniczy 72 (6), 1-15 (2016).
• [10] F.E. Heuze, Estimating the Deformability and Strength of Rock Masses – In-Situ Tests, and Related Procedures. In: STRATCOM Advanced Concept Technology Demonstration (ACTD), Albuquerque (2003). DOI: https://doi.org/10.2172/15005085.
• [11] M. Rezaei, M. Ghafoori, R. Ajalloeian, Comparison between the In situ Tests’ Data and Empirical Equations for Estimation of Deformation Modulus of Rock Mass. Geosciences Research 1 (1), 47-59 (2016). DOI: https://doi.org/10.22606/gr.2016.11005.
• [12] A. Palmström, R. Singh, The deformation modulus of rock masses – comparisons between in situ tests and indirect estimates. Tunnelling and Underground Space Technology 16 (3), 115-131 (2001). DOI: https://doi.org/10.1016/S0886-7798(01)00038-4.
• [13] M. Bukowska, A. Kidybiński, Wpływ czynników naturalnych masywu skalnego na jego wytrzymałość określaną metodami penetrometryczną i laboratoryjną. Prace Naukowe Głównego Instytutu Górnictwa, Research reports mining and environment 1, 35-46 (2002).

Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)