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Saturday, May 16, 2020 | History

2 edition of Determination of the deformation modulus of rock from tunnel and borehole loading tests found in the catalog.

Determination of the deformation modulus of rock from tunnel and borehole loading tests

John R. Booker

Determination of the deformation modulus of rock from tunnel and borehole loading tests

by John R. Booker

  • 347 Want to read
  • 8 Currently reading

Published by University of Sydney, School of Civil and Mining Engineering in Sydney .
Written in English

    Subjects:
  • Rocks -- Testing.,
  • Deformations (Mechanics)

  • Edition Notes

    Statementby J. R. Booker and J. P. Carter.
    ContributionsCarter, J. P., University of Sydney. School of Civil and Mining Engineering.
    The Physical Object
    Pagination12, [8] p. :
    Number of Pages12
    ID Numbers
    Open LibraryOL21972585M

    High pressure dilatometer tests ( No), impression packer tests (75 No), packer In situ testing permeability tests (31 No), mm dia. borehole plate bearing tests (5No.), Imdia. trial pit plate bearing tests (5 No), mm square direct shear tests (5 No.). Borehole geologging (47 No), cross hole 'shooting' (2 No), marine seismic reflection. The modified borehole jacking method, as introduced by De La Cruz in , has important theoretical advantages over the common method which is associated with the name Goodman. So far, however, the modified method has not succeeded, mainly due to a lack of suitable instrumentation. To overcome this problem, a new type of modified borehole jack has been designed, built and tested.

    Engineering Properties of Soil and Rock E-1 Design Manual Chapter Geotechnical Design Originally Issued: Revised: Quick Tips: • The geotechnical designer is responsible for determination of geotechnical parameters. • Selection of soil/rock engineering properties requires that the designer understand the loading. D Standard Test Method for Determination of Water Content of Soil By Direct Heating. D Standard Test Method for Determining In Situ Modulus of Deformation of Rock Using Diametrically Loaded mm (3-in.) Borehole Jack. D Standard Test Methods for pH of Soils.

      Loads on tunnels (1) 1. Loads on Tunnels 2. • The most important potential loads acting on underground structures are earth/rock pressures and water pressure.• Live loads due to vehicle traffic on the surface can be safely neglected, unless the tunnel is . Modified Borehole Jack Method for Elastic Property Determination in Rocks. This paper describes a method of determining thein-situ elastic properties of rock masses with friction-strain gauges and a lengthened borehole jack.. The method involves impressing tangentially-oriented friction gauges on opposite quadrants of a borehole wall, while the remaining quadrants are loaded by the borehole.


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Substance of a speech of the Right Honourable George Canning, in the House of Commons, on Wednesday the 30th of April, 1823, on Mr. Macdonalds motion respecting the negotiations, at Verona, Paris, and Madrid. With an appendix, containing papers presentedto both Houses of Parliament.

Substance of a speech of the Right Honourable George Canning, in the House of Commons, on Wednesday the 30th of April, 1823, on Mr. Macdonalds motion respecting the negotiations, at Verona, Paris, and Madrid. With an appendix, containing papers presentedto both Houses of Parliament.

Determination of the deformation modulus of rock from tunnel and borehole loading tests by John R. Booker Download PDF EPUB FB2

Exact solutions are presented for the radial displacement of plates and cylindrical membranes jacked or expanded against the walls of a circular tunnel or borehole. The deformation modulus is determined by taking the loading curve into account hence, both the permanent and elastic displacements are included in the interpretation.

25 The typical equation used in the interpretation of the deformation modulus is given: (1) E p = E rm = (1 + ν) × 2 V × (∆ P / ∆ V) where E p stands for a deformation Author: İbrahim Ferid Öge.

@article{osti_, title = {Determination of Rock Mass Modulus Using the Plate Loading Method at Yucca Mountain, Nevada}, author = {Finley, R E and George, J T and Riggins, M}, abstractNote = {A suite of plate loading tests has recently been conducted by Sandia National Laboratories at the Exploratory Studies Facility at Yucca Mountain, : R.E.

Finley, J.T. George, M. Riggins. The objectives of this study were (i) to experimentally determine the in-situ deformation modulus of a heavily jointed chert rock mass by performing the Menard Pressuremeter Test (MPT), (ii) to determine geomechanical characteristics of the chert rock mass, (iii) to examine the dependency of deformation modulus to the confining stress for the blocky rock masses, and (iv) to develop empirical Cited by: 9.

Since stiff plate loading is used at the METU testing facility, the relations used in rigid-plate theory are considered in determining the deformation modulus of the rock mass. DEFORMABILITY EQUATIONS FOR ROCK MASS Using the METU method, it is possible to determine the instant, interval and overall deformation modulus of the rock by: The main purpose of this paper is to obtain the rock mass rating (RMR) from different methods considering either the elastic modulus of intact rock specimens (Ei) and the modulus of deformation of.

Modulus of deformation of a rock mass (Em): The ratio of stress (p) to corresponding strain during loading of a rock mass, including elastic and inelastic behaviour (w d), as shown in Figure 1. D and 2) flat jack tests ASTM-D The Plate Loading Test – this in situtest method is used for determining the rock mass modulus of deformation based on ASTM D The test method is designed to be conducted in an adit or small underground chamber.

Several tests were conducted with horizontal and vertical setting in order to. Borehole deformability tests are used for in-situ modulus measurements in boreholes. Instrument setups can be broken down into two groups according to the area of appli-cation: Low pressures and long displacements are required in soils, high pressures and relatively short displacements in rock.

The following methods exist to meet the particular. The most common in situ test for the determination of the deformation modulus of a rock mass is the plate loading test or jacking test such as those shown in Figs.

2 and 3. These tests involve either a pressurized flat jack acting against a strut or a set of hydraulic jacks which apply the load to a. Determination of the in Situ Modulus of Deformation of Rock.

ASTM International, - Deformations (Mechanics) - pages. 0 Reviews. Preview this book. The authors propose the method to estimate deformation properties of rocks by the data on pressuremeter test in hydrofractured interval, allowing in situ values of Young’s modulus and Poisson’s ratio of rocks.

deformation modulus of rock masses was made by Hoek and Diederichs (). triaxial tests on intact rock specimens. At least five well spaced data points should be Rock mass properties 9 the tunnel face is shown in Figure 3 and a back analysis of the behaviour of this material suggests that an appropriate value for V ci.

Bieniawski () recommended that since the tests involving full-scale prototype behavior (tunnel relaxation) give different results by comparison with other in-situ tests for the determination of deformation modulus, two or more methods should be used to crosscheck the results.

ISP5-PRESSIO International Symposium 6 In particular, concerning the scale effect in rock mass deformability, Pinto de Cunha and Muralha () showed the effect of the volume involved in the test of the deformation modulus measured.

Figure 5 shows this phenomenon, where LAB are laboratory tests, BHD are Borehole. Determination of rock mass deformation modulus is very important in different projects, especially in civil and mining engineering works.

In-situ measurements such as dilatometer, plate load and flat jack methods may be applied to determine the deformation modulus. However, these methods are very expensive and time- consuming.

This test determines how in-situ rock reacts to controlled loading and unloading cycles and provide data on defirrnation moduli, creeo and rebound. The modulus of deformation of rock mass is lower than the elastic modulus of intact rock material as determined in the laboratory.

This standard was first published tn The modulus of deformation of rock mass is, however, normally obtained from expensive and time-consuming uniaxial jacking tests, whose results often have a large scatter.

The manufacturer’s specifications are: range of travel is 13 mm ( in.) from closed at 70 mm ( in.) to fully open at 83 mm ( in.), maximum pressure on borehole wall is 64 MPa ( psi), and deformation resolution is mm ( in.). To obtain realistic values of the rock mass deformation modulus, in situ tests, such as plate bearing, flat jack, pressure chamber, borehole jacking and dilatometer tests, need to be conducted.

However, in situ tests are time-consuming, expensive and, in some cases, even impossible to carry out. Therefore, the deformation modulus of a rock mass.

However, this generally decreases the accuracy of the stress determination in all but the most homogeneous and isotropic rock. Modulus of deformation results may be used from other in situ tests, such as Test Methods D and Test Method D, D or other test methods that can determine the modulus of deformation in specific directions.During tunnel excavation, the deformation of surrounding rock due to unload of rock mass will vary with time.

However, the measured displacement of surrounding rock is only a part of the actual.deformation modulus of both intact rocks and rock masses using both dilatometer and plate loading test results.

Palmström and Singh [17] have compared the methodologies for the determination of deformation modulus of rock masses, and made an adjustment to Goodman Jack test results, regarding to Plate Loading Tests. Georgiadis and.