Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents
Hydromechanical coupling in rock masses is an important issue for many rock mechanics and hydrogeology applications. The change of a water-bearing state will induce the fracture of the intact rocks and further accelerate the shear slip instability of the sheared surface. To investigate the weakening...
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2020-01-01
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Online Access: | http://dx.doi.org/10.1155/2020/4543719 |
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doaj-e957c97db78e48bcb433865d92c7eadc2020-11-25T02:38:45ZengHindawi-WileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/45437194543719Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water ContentsChangang Du0Lulu Sun1Botao Qin2Jiang Xu3Yixin Liu4School of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaSchool of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaSchool of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaHydromechanical coupling in rock masses is an important issue for many rock mechanics and hydrogeology applications. The change of a water-bearing state will induce the fracture of the intact rocks and further accelerate the shear slip instability of the sheared surface. To investigate the weakening effect of water content on the mechanical properties of a rock mass, laboratory direct shear tests combined with three-dimensional analysis of sheared surfaces were carried out on sandstone samples with different water contents. The variogram parameters, sill and range, were applied to quantify the morphology of shear fracture surfaces, to reflect the shear failure process of the intact rock, and to provide a basis for resliding instability of jointed rock. It was determined that the sill represents the height of the fluctuation body in the fracture surface and the range represents the single fluctuation body and may reflect the frequency of fluctuations. The test results revealed that the increase in water content had a clear weakening effect on the shear strength and deformation behavior of rock, especially under saturated conditions. Moreover, the distribution of water in the samples directly affected the crack initiation and propagation and characteristics of the fracture morphology.http://dx.doi.org/10.1155/2020/4543719 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Changang Du Lulu Sun Botao Qin Jiang Xu Yixin Liu |
spellingShingle |
Changang Du Lulu Sun Botao Qin Jiang Xu Yixin Liu Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents Geofluids |
author_facet |
Changang Du Lulu Sun Botao Qin Jiang Xu Yixin Liu |
author_sort |
Changang Du |
title |
Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents |
title_short |
Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents |
title_full |
Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents |
title_fullStr |
Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents |
title_full_unstemmed |
Shear Behavior and Anisotropy Characteristics of the Fracture Morphology of Sandstone with Different Water Contents |
title_sort |
shear behavior and anisotropy characteristics of the fracture morphology of sandstone with different water contents |
publisher |
Hindawi-Wiley |
series |
Geofluids |
issn |
1468-8115 1468-8123 |
publishDate |
2020-01-01 |
description |
Hydromechanical coupling in rock masses is an important issue for many rock mechanics and hydrogeology applications. The change of a water-bearing state will induce the fracture of the intact rocks and further accelerate the shear slip instability of the sheared surface. To investigate the weakening effect of water content on the mechanical properties of a rock mass, laboratory direct shear tests combined with three-dimensional analysis of sheared surfaces were carried out on sandstone samples with different water contents. The variogram parameters, sill and range, were applied to quantify the morphology of shear fracture surfaces, to reflect the shear failure process of the intact rock, and to provide a basis for resliding instability of jointed rock. It was determined that the sill represents the height of the fluctuation body in the fracture surface and the range represents the single fluctuation body and may reflect the frequency of fluctuations. The test results revealed that the increase in water content had a clear weakening effect on the shear strength and deformation behavior of rock, especially under saturated conditions. Moreover, the distribution of water in the samples directly affected the crack initiation and propagation and characteristics of the fracture morphology. |
url |
http://dx.doi.org/10.1155/2020/4543719 |
work_keys_str_mv |
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