Last edited by Tygozshura
Thursday, July 9, 2020 | History

3 edition of Field Testing of the Explosive-Anchored Rockbolt. found in the catalog.

Field Testing of the Explosive-Anchored Rockbolt.

United States. Bureau of Mines.

Field Testing of the Explosive-Anchored Rockbolt.

by United States. Bureau of Mines.

  • 185 Want to read
  • 33 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 6595
ContributionsParsons, E., Osen, L.
ID Numbers
Open LibraryOL21740990M

3 - FIELD TESTING. DEFORMABILITY TESTS. SM for Determining In Situ Deformability of Rock – Part 1 SM for Determining the Strength of a Rockbolt Anchor (Pull Test) Part 2 SM of Determining Rockbolt Tension Using a Torque Wrench. ISBN: OCLC Number: Description: x, pages: illustrations, figure ; 27 cm: Contents: Site Characterization --The quantitative description of discontinuities in rock masses --Geophysical logging of boreholes --Laboratory and field testing --Petrographic description of rocks --Determining water content, porosity, density.

A field test was then conducted to compare the three support designs. An instrumentation program was put in place in the field, and monitoring results were used to validate the numerical models.   Excavation – In-situ rock tests. Laboratory tests are usually performed in addition to and after field observations and tests. These tests serve to determine index values for identification and correlation, further refining the geologic model of the site and they provide values for engineering properties of the rock used in the analysis and design of foundations and cut slopes.

The pullout test characteristic is described by the proposed model, and a back analysis method is proposed to. Field monitoring is. useful a nd somet imes nec essary to e nsure th e boltin g. The Geokon Model Instrumented Rockbolt is made by inseting a vibrating wire strain gage inside a short length of standard threaded rockbolt or rebar. This short length is then Read each channel in turn and record in a field book and/or by depressing the “STORE” button. When using the .


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Field Testing of the Explosive-Anchored Rockbolt by United States. Bureau of Mines. Download PDF EPUB FB2

Additional Physical Format: Online version: Parsons, Edward W. Field testing of the explosive-anchored rockbolt. [Pittsburgh, Pa.]: U.S. Dept. of the Interior. 1. Introduction.

Rock bolting is the major reinforcement pattern in underground coal mines in China and other major coal mine countries (Peng and Tang,Hou et al.,Mark et al., ).The strength of bolt material has increased significantly in the past 30 years, from low to high and very high strength (Kang and Wang, ).In the early period of rock bolting in China's coal mines Cited by: Rockbolts exposed in underground mines provide us information on the loading conditions, failure modes, and how the rockbolts behaved in fractured rockmasses (Li, ).

Fig. shows a fully cement encapsulated rockbolt and fractures exposed on an excavation face in a cut-and-fill mine drift. The bolt was installed in the roof of the previous cut slice and exposed on the face of the.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

The objective of the method is to measure anchor performance, and not the performance of the rock bolt itself. Thus, to make sure the bolt response during the test is minimal and predictable, high strength, short-length (6 to 8 ft ( to m)) bolts have been specified.

Test samples were prepared from the rebar bolt and the D-Bolt in this study. They had a dog-bone shape, with a mm diameter and a mm length for the middle stretch section.

The tensile test results of these two bolts were similar. As a representative, Fig. 5 shows the result of the D-Bolt. Under tensile loading, the sample was elongated.

F t is the pullout force from field pull-out test and F 0 is the pullout force from numerical simulation by using the grout cohesive strength c g and the grout friction angle φ g.

The grout cohesive strength c g is the average value of the lower limit c g 1 and the upper limit c g 2, while the grout friction angle φ g is the average value of. The Smart Rockbolt was proposed at Lulea University of Technology in Sweden.

The Smart Rockbolt is a standard rock bolt equipped with a strain sensor, accelerometer, processing module and wireless communication module. A photo of the Smart Rockbolt is shown in Figure Integrated with the Internet of Things (IoT) technology, the Smart.

Before rockbolt pullout, the energy absorption values of specimens D, D, and D are kJ, kJ, and kJ, respectively. The energy absorbed by the rockbolt in the pullout test increases with the cement mortar strength when the rockbolt diameter is uniform.

Book was published in (by the ISRM via the Turkish National Group) and contains the complete set of Suggested Methods from to inclusive. Since that time, and as a result of the enthusiasm and dedicated work of Prof. Ulusay and his colleagues, many more Suggested Methods have been generated—leading to this Orange Book, published by.

To investigate the influence of various parameters in the double shear test, a numerical model of a fully grouted rockbolt installed in concrete was.

A number of Indian Standards covering methods of test to assess various properties of rocks are being formulated. This standard covers method for conducting pull-out test on anchor bars and rock bolts is a full-column-grouted rock bolt or bar with cement-sand grout or resin and rock bolt is ungrouted mechanically anchored bolt.

SAMPLING AND TESTING. AND. BASIS FOR USE OF MATERIALS. GENERAL. The Department Standard Specifications, Sectionstates that the minimum required number of samples and tests will be as set out in the Frequency Manual.

This edition of the Frequency Manual was prepared to make the frequency of sampling and testing conform to the. SM for Rapid Field Identification of Swelling and Slaking Rocks - [EUR 4] SM for Large Scale Sampling and Triaxial Testing of Jointed Rock - [EUR 4] BOLTING AND ANCHORING TESTS.

SM for Rockbolt Testing - [EUR 4] SM for Rock Anchorage Testing - [EUR 4] 4. 4 The “Yellow Book’, is out of print and many new SMs have been produced since InProfessor John A. Hudson was elected to the Presidency of the ISRM for the period Responsibility for the Commission on Testing Methods.

to - The Blue Book ISRM Suggested Methods published between and are compiled in The ISRM Blue Book: "The Complete ISRM Suggested Methods for Rock Characterization, Testing and Monitoring", Edited by R. Ulusay and J.A.

Hudson. this book is the complete set of SMs from to inclusive. Contents The book consists of 4 parts including a total of 40 Suggested Methods.

Site Characterization The quantitative description of discontinuities in rock masses, geophysical logging of boreholes. Laboratory Testing Petrographic description of rocks. book for Rock Bolting, 2nd ed., Trans Tech and in the field, surface test sites were chosen in granite, limestone and shale rock masses, as well as an underground case study at the Golden.

This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

A number in parentheses indicates the year of. In the field, the stiffness of the testing machine is replaced by the stiffness of the rock mass surrounding the volume of rock of interest.

Uniaxial compression tests require a careful test set-up and strict specimen preparation. Requirements for specimen preparation and tes ting are discussed in ASTM D.

Rockbolt design examples are given to illustrate the concepts of elastic and plastic designs. It is found that soft cushions placed between mesh and head plate can be employed to absorb wave energy and protect weak connections in a rockbolt-mesh support system, effective slip mechanisms must be designed for fully grouted bolts, and frictional.Humboldt manufactures construction materials testing equipment for use with soil, concrete, cement and asphalt materials.

Humboldt has geotechnical and soil mechanics equipment like triaxial, consolidation and direct shear involving ASTM standards.coal mining operations. Field monitoring, together with laboratory testing and back analyses through the use of numerical modelling, have provided new insight into rock behaviour and the function and performance requirements of rock reinforcement systems.

This section summarises the most commonly used roof-bolting elements and the design.