2 edition of In situ horizontal stress determinations in the Yampa coalfield, northwestern Colorado found in the catalog.
In situ horizontal stress determinations in the Yampa coalfield, northwestern Colorado
David L. Bickel
Bibliography: p. 26-27.
|Statement||by D.L. Bickel and D.A. Donato.|
|Series||Report of investigations / United States Department of the Interior, Bureau of Mines ;, 9149, Report of investigations (United States. Bureau of Mines) ;, 9149.|
|Contributions||Donato, D. A.|
|LC Classifications||TN23 .U43 no. 9149, TA706 .U43 no. 9149|
|The Physical Object|
|Pagination||ii, 43 p. :|
|Number of Pages||43|
|LC Control Number||87600291|
On the geology and physiography of a portion of northwestern Colorado and adjacent parts of Utah and Wyoming by White, Charles A. (Charles Abiathar), bounded. Consequently, stress drop can be inferred only indirectly. For example, the. typical method is to calculate the moment and 'infer the stress drop by using the relation between the moment and the stress drop for a circular brack in an infinite boðý. Thus the stress drop is determined from.
stress levels. In situ stress measurements carried out in the area (Munsamy, ; Walker and Altounyan, ) show that the major horizontal stress is substantially higher than the vertical stress. From the available results, horizontal to vertical stress ratios of and were interpreted. To study the possible mechanisms involved in the. A gravity-induced horizontal stress is not the only source for horizontal stress, otherwise horizontal stress would be equal in all horizontal directions; as is the case within the interior of the moon. Unlike the moon, however, the earth has an additional component of horizontal stress because the earth’s outer shell is subdivided into more.
Gaoligong Mountain tunnel is the key project in the Dali-Ruili Railway. In order to optimize the design and guide construction, In-situ stress has been conducted in five boreholes using hydraulic fracturing method, the current shallow crustal in-situ stress state at the project area are obtained according to the measurements results, and deep in-situ stress is predicted using lateral pressure. of the vertical stress component is generally known and is a factor taken into consideration in the design of mine workings. The effect of horizontal stress less used in coal mining. A mine working can be deformed differently, depending on the differing orientation toward the horizontal components of stress.
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The horizontal stresses were determined in three mines in the yampa coalfield and one mine in the adjacent Danforth Hills coalfield of northwestern Colorado. Stresses were determined from stress-relief measurements using a three-component borehole deformation gauge and overcoring techniques developed by the Bureau.
Get this from a library. In situ horizontal stress determinations in the Yampa coalfield, northwestern Colorado.
[David L Bickel; D A Donato]. In situ horizontal stress determinations in the Yampa coalfield, northwestern Colorado horizontal stresses were determined in three mines in the yampa coalfield and one mine in the adjacent Danforth Hills coalfield of northwestern Colorado.
Stresses were determined from stress-relief measurements using a three-component borehole deformation. Feb.Denver, Colorado Rear Horizontal Stress Abutment Roof damage in the entries and crosscuts in the panels just outby the cave was probably caused by the rear horizontal stress abutment (figure 16).
This abutment did not advance with the mining, but. ri / in situ horizontal stress determination in the yampa coalfield, northwestern colorado, pb, $ 48 ri / cost comparison of gob hole and cross-measure borehole systems to control methane in gobs, pb, $ 15 ri / laboratory assessment of alternative longwall stabilization materials, pb, $ The in situ stress measuring result shows that the maximum horizontal stress is – times of vertical stress and almost times of the minimum horizontal stress in this mineral field.
And the mining-induced stress measuring result shows that, according to the magnitude of front abutment pressure the stress region can be separated.
The Sigra IST (In-situ Stress Tool), developed by Sigra Pty, Ltd. of Australia, is a device for measuring the horizontal in-situ stress field from surface coreholes in advance of underground development. By determining the horizontal stress field prior to mining, the mine layout and production sequence can be optimized to mitigate the effects.
Estimation of In-situ Stress and Coal Bed Methane Potential Fig. 14 Gas content contour maps for a seam O, b seam P, c seam Q and d seam R of Jharia coal ﬁ eld, India. Discharge measurements and sediment samples were taken at streamflow-gaging station Yampa River at Deerlodge Park in and to determine the annual sediment supply to the Yampa Canyon in Dinosaur National Monument.
Forty-three years of discharge records at two tributary sites were combined to determine the historic discharge of the Yampa River at Deerlodge Park.
The Yampa Bed, a Regionally Extensive Tonstein in the Williams Fork Formation, Northwestern Piceance Creek and Southern Sand Wash Basins, Colorado: Us [Croco, Sarah Elizabeth, Brownfield, Michael E., Johnson, Edward A.] on *FREE* shipping on qualifying offers.
The Yampa Bed, a Regionally Extensive Tonstein in the Williams Fork Formation, Northwestern Piceance Author: Sarah Elizabeth Croco, Michael E. Brownfield, Edward A. Johnson. In contrast, the magnitude of the horizontal in situ stress field generally cannot be predicted without measurements.
Brown and Hoek () found that the ratio of the average of the two horizontal stresses to the vertical stress varies widely, from to greater than near the surface and from to at depths be feet. in situ stresses, it became clear that in many cases the horizontal stress actually exceeded the vertical, often by factors of three or more (Dahl and Parsons, ; Hoek and Brown, ).
A number of theories were proposed to explain the presence of horizontal stress. The cumulative effects of changes in dissolved solids from a number of coal mines are needed to evaluate effects on downstream water use.
A model for determining cumulative effects of streamflow, dissolved-solids concentration, and dissolved-solids load was calibrated for the Yampa River and its tributaries in northwestern Colorado. The model uses accounting principles.
The relationship between vertical stress and horizontal velocity is (2) σ = σ 0 + v − v 0 / c a b. Namely, the horizontal velocity is positively correlated with vertical stress. Therefore, the tomographic velocities as Fig. 7 shown can be used to identify high vertical stress areas directly.
Identification of high vertical stress zones. Evaluation of Trends in pH in the Yampa River, Northwestern Colorado, – by Daniel T. Chafin Available from the U.S.
Geological Survey, Branch of Information Services, BoxDenver Federal Center, Denver, COUSGS Water-Resources Investigations Report41 p., 25 figs. ABSTRACT A method to determine in situ stress directions and magnitudes from anelastic strain recovery measurements of oriented core has been used to determine the principal horizontal in situ stresses in the Rollins Sandstone in a deep well near Rifle, Colorado.
The principal horizontal stress directions were determined directly from the principal horizontal strain recovery directions. Horizontal stress and longwall headgate ground control Horizontal stress During the past 15 years, horizon tal stress has become central to the understanding of coal mine ground control.
An important breakthrough was the recognition that the stresses observed in coal mines are caused by global plate-tectonic forces (Mark, ). Determination of in-situ stress and rock strength using borehole acoustic data Article (PDF Available) in SEG Technical Program Expanded Abstracts January with Reads.
Through data independently measured and collected within m, this paper summaries distribution laws of in-situ stress in deep underground coal mines of our country, main existing types of in-situ stress and its directional characteristics.
Figure 1 - General pattern of vertical and horizontal stress redistribution (Gale ) There is also an increase in the vertical stress observed above the pillar behind the face and a large reduction in the horizontal stress.
Tarrant () provides the mechanism for this large stress relief – shear along bedding in the direction of the goaf. COAL RESOURCE OCCURRENCE AND COAL DEVELOPMENT POTENTIAL MAPS OF THE YAMPA QUADRANGLE, ROUTT COUNTY, COLORADO [Report includes 3 plates] Prepared for UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY By DAMES & MOORE DENVER, COLORADO This report has not been edited for conformity with U.S.
Geological Survey editorial .Estimation in-situ stress magnitudes from core disking p. Determination of in-situ stress from oriented core p. An assessment of in-situ rock stress based on the empirical TSI index and the logic tree method p. A new approach for measuring the in situ 3D rock stress tensor in drilled borehole p.
Quality of life on the Colorado Plateau: A report to the respondents in southwestern Colorado and northwestern New Mexico: USGS Open-File Report [Ponds, Phadrea, U.S. Department of the Interior, United] on *FREE* shipping on qualifying offers.
Quality of life on the Colorado Plateau: A report to the respondents in southwestern Colorado and northwestern Author: Phadrea Ponds.