Stress Wave Propagation through Rock Joints Filled with Viscoelastic Medium Considering Different Water Contents

Published on Jul 13, 2020in Applied Sciences
· DOI :10.3390/APP10144797
Xiaolin Huang27
Estimated H-index: 27
,
Xiaolin Huang6
Estimated H-index: 6
+ 3 AuthorsLiang Ning2
Estimated H-index: 2
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Abstract
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3 Authors (Wei Wu, ..., Jian Zhao)
43 Citations
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#1Xiaolin Huang (CAS: Chinese Academy of Sciences)H-Index: 6
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Kaiwen Xia (U of T: University of Toronto)H-Index: 6
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The purpose of this article is to further investigate the seismic response of an artificial filled joint under high-amplitude stress waves considering the effect of filling humidity, following our earlier work on dry infill. A steel split Hopkinson pressure bar system is utilized to induce high-amplitude stress waves to the filled joint. In this study, the wet infill is a mixture composed of quartz sand, kaolinite clay, and water. It is found that when the water content is relatively low, i.e., ...
3 CitationsSource
#1Bowen Zheng (CAS: Chinese Academy of Sciences)H-Index: 5
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Abstract Rock joint roughness coefficient (JRC) is an important parameter to determine the shear strength of unfilled hard rock joints. It is of great significance to acquire a representative value of JRC. For irregular undulated joints, the JRC has a strong directivity and surface inclination can reflect the roughness difference under the condition of cyclic shear. Considering Barton's standard joint roughness profiles as an example, the secant angles and tangent angles of surfaces dipping oppo...
34 CitationsSource
#1Songfeng Guo (CAS: Chinese Academy of Sciences)H-Index: 6
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Abstract Roughness is one of the most important parameters of unfilled joint. In this study, a series of numerical tests have been carried out on the progressive failure of rock masses with varied undulate joints. The numerical model reproduced the stress–strain relations obtained in lab tests on the marble samples with smooth joint under the confinement of σ 3 /σ c = 0.013 and 0.27; meanwhile, the results of the numerical model on rock mass with rough joint indicated that with the increase of c...
30 CitationsSource
#1Wei Wu (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 56
#2Jian Zhao (Monash University)H-Index: 63
Keywords: Rock fracture ; Granular materials ; Water content ; P-wave attenuation Reference EPFL-ARTICLE-207324doi:10.1007/s00603-014-0606-9View record in Web of Science Record created on 2015-04-13, modified on 2016-08-09
18 CitationsSource
#1Xiaolin Huang (CAS: Chinese Academy of Sciences)H-Index: 6
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Wanli Dong (CAS: Chinese Academy of Sciences)H-Index: 1
view all 4 authors...
Experiments were conducted to study the relationship between the transmission ratio (TR) and normal stress, joint roughness, joint number and frequency of incident waves, respectively, when ultrasonic waves pass across a rock mass with one joint and multiple parallel joints oriented normally. The ultrasonic waves were generated and received by pairs of piezoelectric transducers and recorded by an ultrasonic detector. The specimens were subjected to normal stress by a hydraulic jack and loading f...
27 CitationsSource
#1Xiaolin Huang (CAS: Chinese Academy of Sciences)H-Index: 6
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Zhifa Zhan (CAS: Chinese Academy of Sciences)H-Index: 5
view all 4 authors...
7 CitationsSource
#1Wei Wu (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 56
#2Jianbo Zhu (California Institute of Technology)H-Index: 25
Last. Jian Zhao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 63
view all 3 authors...
Rock fractures filled with viscoelastic materials, such as sand, usually contribute to rock mass instability under the influence of seismic waves and dynamic loads. The purpose of this study is to verify that the specific fracture stiffness and the specific initial mass of the filling sand are two key fracture parameters in interrelating the physical, mechanical and seismic properties of a rock fracture filled with dry sand. A series of dynamic tests using a split Hopkinson rock bar was conducte...
43 CitationsSource
#1Jianchun Li (CAS: Chinese Academy of Sciences)H-Index: 23
#1Jianchun Li (CAS: Chinese Academy of Sciences)H-Index: 29
Last. Jian Zhao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 63
view all 5 authors...
The present study essentially employs a thin-layer interface model for filled rock joints to analyze wave propagation across the jointed rock masses. The thin-layer interface model treats the rough-surfaced joint and the filling material as a continuum medium with a finite thickness. The filling medium is sandwiched between the adjacent rock materials. By back analysis, the relation between the normal stress and the closure of the filled joint are derived, where the effect of joint deformation p...
43 CitationsSource
#1Wei Wu (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 56
#2Jianbo Zhu (California Institute of Technology)H-Index: 25
Last. Jian Zhao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 63
view all 3 authors...
The purpose of this study is to further investigate the seismic response of a set of parallel rock fractures filled with viscoelastic materials, following the work by Zhu et al. Dry quartz sands are used to represent the viscoelastic materials. The split Hopkinson rock bar (SHRB) technique is modified to simulate 1-D P-wave propagation across the sand-filled parallel fractures. At first, the displacement and stress discontinuity model (DSDM) describes the seismic response of a sand-filled single...
33 CitationsSource
#1Jianbo Zhu (California Institute of Technology)H-Index: 25
#2X.B. Zhao (NU: Nanjing University)H-Index: 14
Last. Jian Zhao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 63
view all 4 authors...
Rock joints have significant effects on wave propagation. When the joints are filled with saturated sand or clay, the filling materials exhibit viscoelastic behavior on wave propagation. In the present study, wave propagation across single and multiple parallel joints filled with viscoelastic medium is examined. Based on a layered medium model, the recursive method is adopted and a modification is made under some special conditions for faster calculation. In the theoretical formulation, analytic...
46 CitationsSource
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The presence of gouge in rock joints significantly affects the physical and mechanical properties of the host rock mass. Wave-based exploration techniques have been widely used to investigate the effects of gouge fill on rock mass properties. Previous research on wave propagation in gouge-filled joints focused on analytical and theoretical methods. The lack of experimental methods for multiple rock joint systems, however, has limited the verification potential of the proposed models. In this stu...
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#1Bowen Zheng (CAS: Chinese Academy of Sciences)H-Index: 5
#2Shengwen Qi (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Songfeng Guo (CAS: Chinese Academy of Sciences)H-Index: 6
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Characterization of the tensile mechanical behaviors of rocks under dynamic loads is of great significance for the practical engineering. However, thus far, its micromechanics have rarely been studied. This paper micromechanically investigated the compression-induced tensile mechanical behaviors of the crystalline rock using the grain-based model (GBM) by universal distinct element code (UDEC). Results showed that the crystalline rock has the rate- and heterogeneity-dependency of tensile behavio...
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