Determination of Blasting Charges for the Site of the Department of External Affairs Building, Sussex Drive

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Publisher’s version / Version de l'éditeur:

Technical Note (National Research Council of Canada. Division of Building Research), 1967-08-01

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Determination of Blasting Charges for the Site of the Department of

External Affairs Building, Sussex Drive

Ferahian, R. H.

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DIVISION OF BUILDING RESEARCH

4N

NATIONAL RESEARCH COUNCIL OF CANAD

ｙ＼［Ｇｾｩｊ

'fE

C

1HIN

J[

CAlL

NOTlE

No.

00

PREPARED BY .H. _rahlan _CHECKED _BY T. D. N .. _APPROVED _BY _• _{• H.}

Ausu8t 1967

PREPARED FOR Limited Dl.tri uti 11

SUBJECT

XT AL A A

Thia report a a atudyof . vibl'aUo m aaur m nts

ta n at th aU • a eh Councll, u ..sex Driv , Ottawa.

due to t at laatin carri d out at the ait. of the propoaed

h adquarter a for h Dep rtm nt of xlerna! Affair.. The

purpose of the t at last. .a to detel'min maxim\lD'l charg •

• uch that 1 1. of vibration. would b acceptabl to the

National ea••rch Council.

T T AND CO CLU 10

Th bla.t.. r carried out i te.t ar •• A. a

de

( i ur 1). At th s location th overburd aa r mov d

and appro bnatelya 10 .. by 10-ft surface of th rock 08 d

into hleh th t ••t hol.a er driU.. Th maximum depth.

of th bor hoi. we , . and

6

It in r a. A. B, and C,

re.p etively The magnitu • of the char ges r bl at ar .

sho n in Tab! I. All ahot. re ain 1 blaata, t I.,

no d.l y capa ... U8 d. ometlm a mol' n 0 ill

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2

-After consultation with the persons at NR.C whose work would be most affected by the bl sting, it was found

acceptable to use charges uch that nowhere would velocities

be higher than those produced by a single 4-lb char e in test

area A. This dictates the charge to

i

lb per delay (0.65 lb

single) in th vicinity of test area C. Using this restdction

as a criterion, the proposed charge zone are shown in

Figure 1. The charges shown are for delayed blasting

where an economic number of blasts can be fired

simul-taneously. For single bla t the weights shown can be

increased by a third. Although the proposed charge in

the vicinity of test area C is comparativ ly small, it is

deemed adequate as the rock elevation there is 175 ft.

the same as the basement floor elevation. Consequently,

the maximum depth of rock blasting would be of the order

of 3 ft. The rock in this area was found to contain

horizontal seams which makes it easily removable, even manually.

It should be no ed that the velocity levels pr opos ed

will cause interruption of the 8 nsitive work at NRC. but

will ensure that no permanent damage is caused to the

instrument. The res archers whose experiments will be

most affected by the blasting xpressed their desire that

blasting be carried out between midnight and 10:00 a. m.

This i a stringent requirement; it is suggested. however,

that the bl sting be re tricted to either the beginning or the end of the working day (e. g. before 10:00 a. m. or

after 4 p. m., but not both). In addition. it will be necessary

that the blasting contractor ke p the contact man at NRC

well inform d of his plan beforeh nd.

To ensur e that the vibration levels dur ing the actual excav tion do not exceed the limits decided upon. the blasting will be monitor ed either by the National

R.esearch Council or by th Dep rtment of Public Works.

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-

TABLE I - PARTICLE VELOCITIES MEASURED DURING EXPERIMENTAL BLASTS

• e

_....

""-1. ..;. T Il! !<' ｾＯ［Ｚ［ＭＺｾｩ 0.0018 ｾｾＪＨ［［ｾＧＮＺＭ . 0.015 0.005 0.Q06 ｾｾＧ ;t..: it 0.048 O. Q48 0.054

ｏｾｏｾｏ

ＰｾＰＹＸ 0.024 0.030 L • "',11' Electron Microscope ｾｓｵ｢Ｍ｢｡ｳ･ｭ･ｮｴ slab on, bedrock <:;［ＭｾｾｾｾｦＧｬＧＺＺ［Ａ［［ｏｾ 009

'YJO'

023 ＺＢｾＮ 0: 021 ［ｾＮＬＮｾＺｾＧｾ

o

ＺｾＧＰＺＲＲＮＧ

ＧＱＺ［ＺｩＱＧＺｾｏＧ

015 .". ""t' ｾＭ_ L ＧＮｴｾＺ［ ";'-i, • ＰＮ［ｾｑＮａＩＮﾷＹｩｾＮＬＮＺＮＧＮｾＮＺｾＮ＿ＮＩＹＮ 009

O:OO-? '

ＧＺ［［［ｾＧｌ 009 0.:e-'42 ',;",1).024 ＧｾＺＢＢＧＮ［ ,IｾＬＬＭＩﾣＮＬ O,!tl8,<;"'f) 024 ｾＺＧＺＯｾｾｾＧ

.

ＺＺﾷＺｊｾ［Ｎ＼ｾｦＺ

.

ＰＮｾＳＶ ' , . , cＺｾＬ

ＰＥＱｾＵ

ｾＮｾＺｩＺＯＡｾＺ

o

/&ts

::0.

0009 .:';'1/:' ,.···c. , - , ＧｪＤｾ［ , <,170 cpS ':ＺＮｾ ,' __ f ;_. ｾＺｾＧｲｾＧｪＧｾｭ . 0.011 O.ＰＲｾｩＧ 0.030

L

T

0.008 0.004 0.003 0.009 0.015 0.020 .f_ ::.-iＮｉＺｾ • ''1: Calorimeter. (Room 5, Basement) 0 .. 009 0.017 ＰｾＰＳｑ

ir

'J

..

"'-;'":'.

,;:kf

ＬｩＨｪＮｾＬＺ 0 048 ＧｾｾｩＺ［ O· 044 .ＭｾｾＧＬ

.

J

OJ'

ｏｾＬｾ［Ｌ 0.036

;: "'.; . lh

ＬｯｾｾＬ

O.041

''-

:iJ,

Ｎｾ . :ｴＧＺＧｾ

.

ｾｾｾｯ｡ｱｾＮ 0.0018 , I;

SO;,

｡ｾ｡ 640 cpa ＢＱｾｾＧ f· ｾＺｬ ./ ｾ :r Dlm. +0. <H32 +0.0365 +0.0062 +0,0217 +0'.0033·, ｾ［ＬＬｾ -0.0043 :;t, +0.0197' ｉｾ i' :l: . ｾｽ ... ﾣｾＢｾＧＬ ;. Vacuum.Spectroscope, Pure Physics (Room 61. Basement Long. Veloc. in./sec

On theti,:

I

Scale

ｓｨｩｦｴｾＺＪ

End Wall on Cia,,":) 0.021 0.024 0.027 0.030 0.015 0.006 0.006 0.011 0.014 0.015 At Pier on Sand

z .,

ＺＱｾ ..-Z .! ".ＭＭｾ '1·,,· J(. > •".1 8 \'ｾＧ . 4 4:[ Ｌｾ 4 .' 8 '"

｟ＺＮ＿ｉｊｾ

Ｚ［［Ｚｽｾｾ

ＢＧ［ｾＧ､ｦ :4! .'1" B1as-t Area

"

.

ＺｉｾｩＺｩＢ

""

ｾＺＭｾＢＭｾＬＭＭＭｬｦｦｾｾｆＢＬＬｾＬｾｽｲＭＭＧｾＧｾｬＮ＿ｾＬＧ［Ｌ［

Measured by ｩ｜ﾷ［Ｚｴｾ｢･ｲｴｩＮ ',Positive shift:E'4:S Ｇｾｷ｡ｴＧｾｦｯｭ Sussex ｄｴＮＬｩｹ･ＬｾＮ

ｓｾｩｦｴ

ｭ･｡ｳｵｲ･､ｾｦＬＡｯｲ･

sta1"t of blasting

ＧＺｾｽ＾ｑＺ

q017:F·

Ｚ［ｾＺ＿ｩｲ

q , , : ,

,

.

ＬｾｾＮＭＺｴＥＮｾｴＭＺ＾

:

Ｌ＼｝ｾＱｦＭＮＬＧ

• .";tt;

V/

L,and T ｩｮＴｩｾｾｴ･ particle ve.loeities::,in ｶ･ｲｴＬｾ｣ｾＮＱｾｬｯｮｧｩｴｵ､ｩｾｴｾｻｰ･ｲｰ･ｾｩｪｩ｣ｵｬ｡ｲ to Sussex' Dr.ＩＢＬｾＱＮｬ､

',. tr;insverse (pai,ijel to Sussex Drｾ ). ｔｨｾｰｩ｣ｫｵｰＬｾＧｷ･ｲ･ｭｯｵｮｴ･ｾｾｯｮ a

wetU

perpendicular' toＵｾＸｾｾｾ Drive.

approximately ＳｴｬｾＮ｡｢ｯｶｾ the basementsl.b. ＮＮＮＮＬ［Ｌ［［ＺｾＬ ' r , ':,'".'

·f' (27 June 1967) A A A " B B B "j'ae§j'une 19(7) ｣ＺｾＧ >',111;. C ﾻｾＺＬＺ C ,J;':, C C

,

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t'