Small- to Large-Scale Rock Fracture Patterns as Indicators of Shock-Related Fragmentation

2016 ◽  
pp. 483-489
Author(s):  
Sakawat Hossain ◽  
Jörn H. Kruhl
Keyword(s):  
Large Scale ◽  
Rock Fracture ◽  
Fracture Patterns

A new Fourier azimuthal amplitude variation fracture characterization method: Case study in the Haynesville Shale

Geophysics ◽  
2018 ◽  
Vol 83 (1) ◽  
pp. WA101-WA120 ◽  
Author(s):  
Anthony Barone ◽  
Mrinal K. Sen
Keyword(s):  
Seismic Data ◽  
Large Scale ◽  
Rock Fracture ◽  
Crack Density ◽  
Fracture Density ◽  
Success Rates ◽  
High Fracture ◽  
Fracture Characterization ◽  
Free Data ◽  
Seismic Reflectivity

We have evaluated a novel fracture characterization technique using azimuthal amplitude variations (AVAz) present in 3D seismic data, and we implemented it using synthetic and real seismic data targeting the Haynesville Shale. The method we evaluated overcomes many common AVAz limitations and differs from standard AVAz approaches in the following ways: (1) It was explicitly designed to model vertically fractured transverse isotropic (VFTI) media; (2) it can correctly resolve the fracture strike azimuth without a 90° ambiguity and uses a new magnitude-based method that is invariant to the sign of seismic reflectivity [Formula: see text]; and (3) it incorporates advanced inversion techniques to estimate a novel fracture density proxy that responds linearly to crack density. Our method is based on a newly derived relationship that relates seismic reflectivity directly to rock/fracture properties in VFTI media. We validated our method through rigorous testing on more than 400 synthetic seismic data sets. These synthetic tests indicate that our method excels at estimating fracture azimuth and fracture density from surface seismic data with overall success rates around 80%–85% for noisy data and 90%–95% for noise-free data. Applying our method to field data from the Haynesville Shale indicates that the dominant fracture set is oriented at approximately [Formula: see text] relative to geodetic north, i.e., rotated slightly counterclockwise of east–west. We assume a constant azimuth of 80° throughout our relatively small 20 square miles study area, and our method clearly identifies a general area with unusually high fracture density as well as several smaller subzones of dense fracturing. These smaller features appear to be connected by a pervasive large-scale fracture network covering the area with dominant features aligned at roughly parallel and perpendicular to our calculated fracture azimuth. Although we could not directly confirm these fracture characteristics, our results largely agree with previously published information about fracturing in our study area.

scholarly journals Deformation Analysis of Large-Scale Rock Slopes Considering the Effect of Microseismic Events

2019 ◽  
Vol 9 (16) ◽  
pp. 3409 ◽  
Author(s):  
Linlu Dong ◽  
Ying Yang ◽  
Bo Qian ◽  
Yaosheng Tan ◽  
Hailong Sun ◽  
...  
Keyword(s):  
Large Scale ◽  
Rock Fracture ◽  
Three Dimensional ◽  
Seismic Source ◽  
Microseismic Monitoring ◽  
Deformation Analysis ◽  
Left Bank ◽  
Exploratory Research ◽  
Rock Slopes ◽  
Bank Slope

To research the macroscopic deformation of rock microseismic damage, a high-precision microseismic monitoring system was established on the left bank slope of the Baihetan hydropower station in Southwestern China. Based on the microseismic monitoring and field deformation data, the seismic source radius was applied to characterize the rock fracture scale. Numerical simulations introduced the rock micro-fracture information into the three-dimensional numerical model of the left bank slope and established the damage constitutive model. The unloading deformation process of the left bank abutment rock mass is described by numerical calculations. The feedback analysis method considering the effect of microseismic damage is preliminary exploratory research, which provides a new idea for the stability analysis of similar high rock slopes.

Research Status and Development Trend of High Sand Filling Materials

2017 ◽  
Vol 727 ◽  
pp. 1079-1083 ◽  
Author(s):  
Yong Liu ◽  
Jie Chen
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Rock Fracture ◽  
Mining Area ◽  
Development Trend ◽  
Filling Material ◽  
Control Effect ◽  
Filling Materials ◽  
Local Water ◽  
The Stability

The coal is main energy in our country, it takes many economy and environment problems in the process of exploitation process.With the development of large-scale mining area, mining of rock fracture field and the change of the terrain, vegetation and ecological environmental impact of surface water, ground seriously. This paper introduces about goaf paste filling mining which is the important part of coal green mining technology, it is an effective method to solve subsidence and the problem of coal mining surface ecological environment. Occurrence of aeolian sand and flexible strip filling control effect on the stability of water-resisting layer create conditions for the development of the local water filling mining.The paste filling material prepared with cemented Filling materials has the advantages of low cost and environment protection, which can take the various benefits such as economy, society and environment to diggings.

Fracture of Monoliths Fabricated by Stacking Water Processed Green Ceramic Tapes

2005 ◽  
Vol 290 ◽  
pp. 203-207 ◽  
Author(s):  
Jonas Gurauskis ◽  
Javier Pascual ◽  
Tanja Lube ◽  
Antonio Javier Sanchez-Herencia ◽  
Carmen Baudín
Keyword(s):  
Fracture Behavior ◽  
Large Scale ◽  
Room Temperature ◽  
Tape Casting ◽  
Casting Process ◽  
Small Scale ◽  
Interface Defects ◽  
Fracture Patterns ◽  
Zro2 System

A lamination technique for joining ceramic green tapes fabricated from aqueous ceramic slurries via tape casting process is investigated. Monolithic pieces with varying compositions within the Al2O3 / t-ZrO2 system were fabricated by gluing the constituent tapes and pressing at room temperature. The quality of the interfaces between the different tapes in sintered specimens was evaluated by means of the fracture behavior of the pieces during the ball on three balls test. Different fracture patterns were found as a function of pressure and the characteristics of the tapes. Large scale interface defects led to delamination during fracture whereas no critical defects could be observed in the smooth fracture surfaces. Small scale interface defects were revealed by fracture.

Heat Induced Fracturing of Rock in an Existing Uniaxial Stress Field

1985 ◽  
Vol 50 ◽  
Author(s):  
J. I. Mathis ◽  
O. Stehpansson ◽  
B. Bjarnason ◽  
H. Hakami ◽  
A. Herdocia ◽  
...  
Keyword(s):  
Large Scale ◽  
Failure Time ◽  
Rock Fracture ◽  
Failure Process ◽  
Uniaxial Stress ◽  
Time To Failure ◽  
Rock Breakage ◽  
Rock Fracturing ◽  
Thermal Failure ◽  
Thermal Fracturing

AbstractThe thermal fracturing of rock has been the object of several research projects, notably for initial rock breakage in mining [4] as well as crushing [6] In addition, the process has been studied carefully in regards to the storage of radioactive waste underground where rock fracturing could lead to a loss of radioactivity confinement. The Stripa Project, a project concerning large scale testing of procedures for underground storage of nuclear waste, probably has dealt most thoroughly with this subject by theoretical studies and in-situ heater testing in an attempt to describe the thermal failure process in rock [13]This project was designed to test the agreement between theoretical and actual rock fracture times of a rock block, loaded with a physical as well as a thermal load. Laboratory testing consisted of physically loading center-drilled cubes of rock, 0.3 m on a side, uniaxially from 0 to 25 MPa. These were then thermally loaded with a nominal 3.7 kW (factory rating) cylindrical heater until failure occurred. This time to failure was recorded for comparison with a direct mathematical and a finite element solution. For both cases, calculations were performed at specific time-steps and an estimated failure time calculated from the compiled results.

scholarly journals Mechanical Properties of Graphene Nanowiggles

2014 ◽  
Vol 1658 ◽  
Author(s):  
R. A. Bizao ◽  
T. Botari ◽  
D. S. Galvao
Keyword(s):  
Mechanical Properties ◽  
Large Scale ◽  
Graphene Nanoribbons ◽  
Failure Patterns ◽  
Fracture Patterns ◽  
Atomic Chains ◽  
Ultimate Failure ◽  
Strain Stress ◽  
Dynamics Simulations ◽  
Interesting Behavior

ABSTRACTIn this work we have investigated the mechanical properties and fracture patterns of some graphene nanowiggles (GNWs). Graphene nanoribbons are finite graphene segments with a large aspect ratio, while GNWs are nonaligned periodic repetitions of graphene nanoribbons. We have carried out fully atomistic molecular dynamics simulations using a reactive force field (ReaxFF), as implemented in the LAMPPS (Large-scale Atomic/Molecular Massively Parallel Simulator) code. Our results showed that the GNW fracture patterns are strongly dependent on the nanoribbon topology and present an interesting behavior, since some narrow sheets have larger ultimate failure strain values. This can be explained by the fact that narrow nanoribbons have more angular freedom when compared to wider ones, which can create a more efficient way to accumulate and to dissipate strain/stress. We have also observed the formation of linear atomic chains (LACs) and some structural defect reconstructions during the material rupture. The reported graphene failure patterns, where zigzag/armchair edge terminated graphene structures are fractured along armchair/zigzag lines, were not observed in the GNW analyzed cases.

scholarly journals Host-rock deformation during the emplacement of the Mourne Mountains granite pluton: Insights from the regional fracture pattern

Geosphere ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 182-209 ◽  
Author(s):  
Tobias Mattsson ◽  
Steffi Burchardt ◽  
Karen Mair ◽  
Joachim Place
Keyword(s):  
Host Rock ◽  
Large Scale ◽  
Rock Fracture ◽  
Fracture Pattern ◽  
Contact Aureole ◽  
Upper Crust ◽  
Magma Body ◽  
Granite Pluton ◽  
The North ◽  
Emplacement Mechanism

Abstract The Mourne Mountains magmatic center in Northern Ireland consists of five successively intruded granites emplaced in the upper crust. The Mourne granite pluton has classically been viewed as a type locality of a magma body emplaced by cauldron subsidence. Cauldron subsidence makes space for magma through the emplacement of ring dikes and floor subsidence. However, the Mourne granites were more recently re-interpreted as laccoliths and bysmaliths. Laccolith intrusions form by inflation and dome their host rock. Here we perform a detailed study of the deformation in the host rock to the Mourne granite pluton in order to test its emplacement mechanism. We use the host-rock fracture pattern as a passive marker and microstructures in the contact-metamorphic aureole to constrain large-scale magma emplacement-related deformation. The dip and azimuth of the fractures are very consistent on the roof of the intrusion and can be separated into four steeply inclined sets dominantly striking SE, S, NE, and E, which rules out pluton-wide doming. In contrast, fracture orientations in the northeastern wall to the granites suggest shear parallel to the contact. Additionally, contact-metamorphic segregations along the northeastern contact are brecciated. Based on the host-rock fracture pattern, the contact aureole deformation, and the north-eastward–inclined granite-granite contacts, we propose that mechanisms involving either asymmetric “trap-door” floor subsidence or laccolith and bysmalith intrusion along an inclined or curved floor accommodated the emplacement of the granites and led to deflection of the northeastern wall of the intrusion.

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