Title: tensile mechanical properties of sandy mudstone in different sedimentary ages
Author: Yang Zhiliang, Zhang Cun, song Honghua, Yang Donghui, Ma Binjie
Author:
China University of mining and Technology (Beijing) School of energy and mining
Beijing Key Laboratory of associated energy precision mining, Beijing 100083
Summary:
In order to analyze the influence of different sedimentary ages on the tensile mechanical properties of weakly cemented sandy mudstones in the west of China, the Brazilian splitting acoustic emission test was carried out based on the mineral composition and microscopic analysis of the sandy mudstones of Zhidan group, Zhiluo group and Yan'an group of Cretaceous, The peak energy rate, failure mode, acoustic emission characteristics, damage variable evolution and tensile mechanical characteristics were studied in the process of splitting. The results show that the micro morphology of the sand mudstones in the top and bottom of Hongqinghe River in Zhidan group, Zhiluo group and Yan'an group are laminated, vermicular, dimple and granular respectively, with tensile strength of 1.78, 2.38, 6.13 and 5.27 MPa, The peak energy rates are 420.9571.1,2419.5 and 1420.0 J / M 2, respectively. The failure mode of Zhidan group sandy mudstone is single, without crack bifurcation, Zhiluo group sandy mudstone has coarse crack, Yan'an group sandy mudstone has main crack bifurcation, even tear, showing multiple failure modes. The cumulative impact number and cumulative energy of Yan'an group sandy mudstone are higher than Zhidan group and Zhiluo group; The damage variable D of sand mudstone in Yan'an formation shows a step-by-step sharp increase, while that of Zhidan group and Zhiluo group shows a gradual change, with obvious differences. Key words: sand mudstone; sedimentary age; Brazil split; acoustic emission; tensile properties; damage variable citation format: Yang Zhiliang, Zhang Cun, song HONGHUA, etc. study on tensile mechanical properties of sand mudstone in different sedimentary ages [J]. Journal of China University of mining and technology, 2020, 49(2):271-279.
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