Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone

In the underground environment with large buried depth and high ground stress, man-made disturbance is very easy to cause the rapid expansion of primary fractures in the rock, and then developed into the macrodynamic performance of rock. Based on the propagation law of elastic waves in discontinuous...

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Main Authors: Wenwu Zhong, Xin Zhang, Tao Li, Xin Yang, Wei Deng, Jianchao Shi
Format: Article
Language:English
Published: Wiley 2022-01-01
Series:Geofluids
Online Access:http://dx.doi.org/10.1155/2022/7895498
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author Wenwu Zhong
Xin Zhang
Tao Li
Xin Yang
Wei Deng
Jianchao Shi
author_facet Wenwu Zhong
Xin Zhang
Tao Li
Xin Yang
Wei Deng
Jianchao Shi
author_sort Wenwu Zhong
collection DOAJ
description In the underground environment with large buried depth and high ground stress, man-made disturbance is very easy to cause the rapid expansion of primary fractures in the rock, and then developed into the macrodynamic performance of rock. Based on the propagation law of elastic waves in discontinuous media, the application of acoustic emission detection technology can quickly determine whether there are primary fractures in the rock and predict its approximate location. In this work, CT scanning experiments of intact sandstone specimens and fractured sandstone specimens were performed. The gray value distribution of intact sandstone specimens and fractured sandstone specimens was studied. The sandstone specimens were divided into 4 zones (I~IV) from top to bottom. The height of each zone is from 0 mm to 25 mm, and the upper end face of each zone is the starting face. Acoustic emission experiments of intact sandstone and fractured sandstone are carried out based on the equilateral triangle sensor array. The dispersion of AE wave velocity and amplitude in intact sandstone specimens and fractured sandstone specimens is studied. The results show that the crack evolution law of sandstone specimens before and after preloading is closely related to the density distribution. The regular trend is from low density to high density. And the decay law of AE eigenvalue before and after preloading of sandstone specimen is consistent with the change trend of gray value. This shows that it is feasible to explore the spatial location of primary fractures and the degree of development of primary fractures in the rock through the equilateral triangle sensor array. In the actual project, it can provide some guidance and suggestions for related projects.
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spelling doaj-art-45ac5664f7d548f397a50ec46557f49d2025-02-03T01:20:02ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/7895498Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated SandstoneWenwu Zhong0Xin Zhang1Tao Li2Xin Yang3Wei Deng4Jianchao Shi5School of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringIn the underground environment with large buried depth and high ground stress, man-made disturbance is very easy to cause the rapid expansion of primary fractures in the rock, and then developed into the macrodynamic performance of rock. Based on the propagation law of elastic waves in discontinuous media, the application of acoustic emission detection technology can quickly determine whether there are primary fractures in the rock and predict its approximate location. In this work, CT scanning experiments of intact sandstone specimens and fractured sandstone specimens were performed. The gray value distribution of intact sandstone specimens and fractured sandstone specimens was studied. The sandstone specimens were divided into 4 zones (I~IV) from top to bottom. The height of each zone is from 0 mm to 25 mm, and the upper end face of each zone is the starting face. Acoustic emission experiments of intact sandstone and fractured sandstone are carried out based on the equilateral triangle sensor array. The dispersion of AE wave velocity and amplitude in intact sandstone specimens and fractured sandstone specimens is studied. The results show that the crack evolution law of sandstone specimens before and after preloading is closely related to the density distribution. The regular trend is from low density to high density. And the decay law of AE eigenvalue before and after preloading of sandstone specimen is consistent with the change trend of gray value. This shows that it is feasible to explore the spatial location of primary fractures and the degree of development of primary fractures in the rock through the equilateral triangle sensor array. In the actual project, it can provide some guidance and suggestions for related projects.http://dx.doi.org/10.1155/2022/7895498
spellingShingle Wenwu Zhong
Xin Zhang
Tao Li
Xin Yang
Wei Deng
Jianchao Shi
Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
Geofluids
title Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
title_full Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
title_fullStr Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
title_full_unstemmed Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
title_short Study on Microscopic Characteristics of Spatial Distribution of Fractures in Deteriorated Sandstone
title_sort study on microscopic characteristics of spatial distribution of fractures in deteriorated sandstone
url http://dx.doi.org/10.1155/2022/7895498
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