ASTM D4395-17
Standard Test Method for Determining In Situ Modulus of Deformation of Rock Mass Using Flexible Plate Loading Method

Standard No.

ASTM D4395-17

Release Date

2017

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4395-17

Scope

5.1 Results of this type of test method are used to predict displacements in rock mass caused by loads from a structure or from underground construction. It is one of several tests that should be performed. The resulting in situ elastic modulus is commonly less than the elastic modulus determined in the laboratory.

5.2 The modulus is determined using an elastic solution for a uniformly distributed load (uniform stress) over a circular area acting on a semi-infinite elastic medium.

5.3 This test method is normally performed at ambient temperature, but equipment can be modified or substituted for operations at other temperatures.

Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection, etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.

1.1 This test method covers the preparation, equipment, test procedure, and data reduction for determining in situ modulus of deformation of a rock mass using the flexible plate loading method.

1.2 This test method is designed to be conducted in an adit or small underground chamber; however, with suitable modifications it could be conducted at the surface.

1.3 This test method is usually conducted parallel or perpendicular to the anticipated axis of thrust, as dictated by the design load and to diametrically opposite surfaces.

1.4 Both instantaneous deformation and primary creep can be obtained from this test method.

1.5 Time-dependent tests not covered by this standard can be performed but are to be reported in another standard.

1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

1.6.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope.

1.7 The values stated in inch-pound units are to be regarded as standard, except as noted below. The values given in parentheses are mathematical conversions to SI units that are provided for information only a......

ASTM D4395-17 Referenced Document

• ASTM D2113 Standard Practice for Rock Core Drilling and Sampling of Rock for Site Investigation
• ASTM D3740 Standard Practice for Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
• ASTM D4394 Standard Test Method for Determining the In Situ Modulus of Deformation of Rock Mass Using the Rigid Plate Loading Method
• ASTM D4403 Standard Practice for Extensometers Used in Rock
• ASTM D4879 Standard Guide for Geotechnical Mapping of Large Underground Openings in Rock
• ASTM D5079 Standard Practices for Preserving and Transporting Rock Core Samples
• ASTM D5434 Standard Guide for Field Logging of Subsurface Explorations of Soil and Rock
• ASTM D6026 Standard Practice for Using Significant Digits in Geotechnical Data
• ASTM D6032 Standard Test Method for Determining Rock Quality Designation (RQD) of Rock Core
• ASTM D653 Standard Terminology Relating to Soil, Rock, and Contained Fluids

ASTM D4395-17 history

• 2017 ASTM D4395-17 Standard Test Method for Determining In Situ Modulus of Deformation of Rock Mass Using Flexible Plate Loading Method
• 2008 ASTM D4395-08 Standard Test Method for Determining In Situ Modulus of Deformation of Rock Mass Using Flexible Plate Loading Method
• 2004 ASTM D4395-04 Standard Test Method for Determining the In Situ Modulus of Deformation of Rock Mass Using the Flexible Plate Loading Method
• 1984 ASTM D4395-84(1998) Standard Test Method for Determining the In Situ Modulus of Deformation of Rock Mass Using the Flexible Plate Loading Method