IS 12955 : Part 2 : 1990 Code of practice for in-siitu determination of rock mass deformability using flexible dilatometer Part 2 Radial displacement

1 Scope

1.1 This standard (Part 2) covers the method for determinationof deformation modulus of rock in-situ using an expanding, probe(dilatometer) to exert pressure on the walls of a drillhole. Theresulting hole expansion (dilation) is measured directly by adisplacement transducer in the probe. Deformability characteristicsof the rock mass at the dilatometer location may be calculated fromthe relation between pressure dilation. Anisotropy of deformabilityin the plane perpendicular to the drillhole may also be determined.

2 Reference

List of Referred Indian Standards

IS 11315 : Part 1 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 1 Orientation

IS 11315 : Part 2 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 2 Spacing

IS 11315 : Part 3 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 3 Persistence

IS 11315 : Part 4 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 4 Roughness

IS 11315 : Part 5 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 5 Wall strength

IS 11315 : Part 6 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 6 Aperture

IS 11315 : Part 7 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 7 Filling

IS 11315 : Part 8 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 8 Seepage

IS 11315 : Part 9 :1987 Method for the quantitativedescription ofdiscontinuities in rock mass:Part 9 Number of sets

IS 11315 : Part 10 :1987 Method for the quantitative description ofdiscontinuities in rock mass:Part 10 Block size

IS 11315 : Part 11 :1985 Method for the quantitative description ofdiscontinuities in rock mass:Part 11 Core recovery and rock quality