Compressive deformation characteristics of crushed sandstone based on multiple experimental factors

• Autorzy: Sun Yanan , Zhang Peisen , Yan Wei , Yan Fenqian , Wu Junda

Identyfikatory

DOI

10.24425/ams.2020.132711

• Języki publikacji: EN

Abstrakty

EN

In this study, the compressive deformation of crushed sandstone was tested using a crushed rock deformation-seepage test system, and the effects of various factors, including crushed rock grade, grade combination, water saturation status, and stress loading method (i.e., continuous loading or cyclic loading and unloading), on the compressive deformation of crushed sandstone was analyzed from four perspectives including stress-strain, bulking coefficient, deformation mechanism and energy dissipation. The results indicate that the stress-strain relations of crushed sandstone are closely associated with all factors considered, and are well represented by exponential functions. The strain observed for a given applied stress increased with increasing crushed rock grade throughout the loading period. Crushed sandstone grades were combined according to a grading index (n), where the proportion of large-grade rocks in the sample increased with increasing n. The bearing capacity of a water-saturated crushed sandstone sample with n = 0.2 was less than that of an equivalent dry sample for a given applied stress. The stress-strain curve of a water-saturated crushed sandstone sample with n = 0.2 under cyclic loading and unloading was similar to that obtained under continuous loading. Observation and discovery, the deformation mechanism of crushed sandstone was mainly divided into four stages, including crushing, rupture, corner detachment and corner wear. And 20% of the work done by testing machine is used for friction between the crushed sandstone with the inner wall of the test chamber, and 80% is used for the closing of the void between the crushed sandstone, friction sliding, crushing damage.

Słowa kluczowe

EN

rock mechanics; saturated graded crushed rock; compressive deformation; cyclic loading; cyclic unloading

PL

mechanika skał; skały kruche; odkształcenie

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2020
• Tom: Vol. 65, no. 1
• Strony: 129--146
• Opis fizyczny: Bibliogr. 40 poz., rys., tab., wykr.

Twórcy

autor

Sun Yanan

• Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
• Mining Engineering National Experimental Teaching Demonstration Center, Qingdao 266590, China

autor

Zhang Peisen

• Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
• Mining Engineering National Experimental Teaching Demonstration Center, Qingdao 266590, China

autor

Yan Wei

• Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
• Mining Engineering National Experimental Teaching Demonstration Center, Qingdao 266590, China

autor

Yan Fenqian

• Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
• Mining Engineering National Experimental Teaching Demonstration Center, Qingdao 266590, China

autor

Wu Junda

• Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
• Mining Engineering National Experimental Teaching Demonstration Center, Qingdao 266590, China

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)