5441336555
|
RockType: 1 General H\ GSI Selection: [50 | | OK | |
SURFACE CONDITIONS | ||||||
|
s|»» |
FAIR |
poorI POOR POOR | |||||
|
STRUCTURE |
DECREASING SURFACE OUALITY NcO | ||||||
|
c |
INTACT OR MASSIVE - intact rock speclmens or massive in situ rock with few widely spaced discontinuities tu |
77 80 // // |
7 |
i |
/ |
N/A | |
|
" ] BLOCKY - well interlocked un- £ disturbed rock mass consisting o of cubical blocks formed by three § [ '•■'■■I interseding discontinuity sets Ł |
Z/ |
/ |
7 |
7 | |||
|
i |
O VERY BLOCKY- interlocked, z partially disturbed mass with g formed by 4 or morę joint sets ^ |
// // |
// |
7 |
7 / |
// |
//, |
|
BLOCKY/DISTURBED/SEAMY z - folded with angular blocks formed by many interseding z discontinuity sets. Persistence ^ of beddlng planes or schistosity tu |
;/, |
// |
$ |
7 |
[// | ||
|
f / |
J | ||||||
|
DISINTEGRATED - poorly inter- tu locked, heavily broken rock mass Q with mixture of angular and Nf rounded rock pieces |
7/ |
// |
y/ |
77 f | |||
|
i |
LAMINATED/SHEARED - Lack of blockiness due to close spacing of weak schistosity or shear planes |
N/A |
N/A |
Ll |
ż |
! | |
Figurę 1: Correlation between GSI and rock mass properties and A//and Nc parameters definition. Rocscience [8]
|
mb ( GSI - 100^ m, Z 28-I4D J |
(2) |
|
(GSI -100^ | |
|
(3) | |
|
\ 9-3D ) | |
|
(4) | |
|
2 6' ’ |
where m, is a materiał constant and D is a Disturbance Factor.
A correlation between the GSI index and the rock mass ąuality can be seen in Figurę I.
3 ROCK MASS STRENGTH ASSESSMENT BASED ON JOINT SPACING AND JOINT CONDITIONS
The GSI is insensitive to those rock mass characteristics that most influence rock mass strength. A series of relationships are proposed that seek to partially address this issue by differentiating rock masses having the same GSI. These relationships are functions of two parameters, N/ and Nc. Nf is a function of the characteristics of the fracturing and interlocking and Nc is a function of the joint condition. The variation of these parameters is conceptually shown in Figurę 1, For example a blocky rock with fair joint surface condition might have a GSI=35, in this case the blocky conditions is characterized by the parameter Nr and the fair surface condition by the parameter Nc,
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