ML20148B265

Vibration Study:Primary Blast - West Face Pottstown Trap Rock,Santagona Quarry,700624. Prepared for Dames & Moore

ML20148B265
Person / Time
Site:	Limerick
Issue date:	06/30/1970
From:	VIBRA TECH ENGINEERS, INC.
To:
Shared Package
ML20148B258	List: ML20148B256 ML20148B260 ML20148B265 ML20148B270
References
NUDOCS 8001210283
Download: ML20148B265 (14)

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VIBRATION STUDY FOR DAMES & MOORE Limeri<.k Generating Station Project SAM.UM$A%wS$NDhk Primary Blast - llest Face

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June 30,1970 VIBRATION STUDY FOR DAMES & MOORE Pottstown Trap Rock - Sanatoga Quarry Primary Blast - West Face June 24, 1970 PURPOSE The purpose of this study was to measure the vibration effects from the primary blast on June 24, 1970 at the above named operation and to determine their capacity to cause structural damage and to certify conformance to the

, Pennsylvania State Law.

THE BLAST This blast consisted of 14 vertical holes, 6 inches in diameter, drilled to an average depth of 36 to 59 feet. The spacing and burden of the holes was 15 x 20 feet with an a'vcrage of 12 feet of stemming material confining

. the charge in each hole.

The total load of 6631 pounds of Dupont Powder ' Company's HDP-1 Primers, Pourvex Extra, and ANFO "P" explosives was detonated in 14 separate i

firing periods by means of Millisecond Electric Delay Blasting Caps #1 thru #14..

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The maximum amount of explosives per delay period was 629 pounds.

Time of detonation was 11:03 A.M.

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- June 30, 1970 WEATHER CONDITIONS 1.

Type of day

- Clear 2.

Wind direction - From the Southwest 3.

Temperature

- Approximately 78 F SEISMOGRAPH STATIONS For registration of the vibration effects from the subject blast two Vibra-Log 3-Component Seis' ographs were employed.

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Station #1:

Velocity Seismograph #178 (0.2 Range) was placed on the ground about 100 feet west southwest of Stack #A-20, approximately 250 feet west of the blast.

Station #2:

4 Velocity Seismograph #151 (1.0 Range) was placed on the ground at the Limerick ~Ge~nerating Station Site at Coordinate 3780 east and 6680 north, approximately 2800 feet south southeast of the blast.

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THE SEISMOGRAPH RECORD The seismograph record represents a photograph of the velocity of vibrations of the surface on which the instrument is sitting, at the recording location, in the form of 3 lines. The bottom line (longitudinal) represents horizontal velocity on a line joining the blast and the recording location; the top line (transverse) represents velocity at right angles to this; and the middle line represents vertical velocity. Deviations of these lines from their positions of rest amount to the velocity of the ground magnified by an instrument factor depending on the range used for the seismograph test. In this case the range was set at 0.2 and 1.0 and the velocities were obtained by measuring the deviations of the traces in inches and dividing by the proper calibration factor.

Vertical lines on the record indicate the passage of time in 0.02 seconds, with every second being indicated by an accent mark.

RESULTS Recent studies by the United States Bureau of Mines and other Authorities in the field of blast vibrations and thelt e:Tects on structures have resulted in a new criteria based on veloc

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inches per second. Below is a table of standards based on a velocity criteria.

VELOCITY PROBABLE DEGREE OF DAMAGE Below 2.0 inches per second Recommended safe vibration level.

Above 4.0 inches per second Threshold - very minor perceptible damage; plaster cracks, etc.

Above 5.5 inches per second

. Minor - no apparent weakening of the structure; glass, plaster, masonry damage.

Above 7.5 inches per second Major - serious structural failure through cracking, distortion or shifting.

The above table is based on the Maximum Velocity on any one component of an instrument measuring motion in three mutually perpendicular planes.

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Dames & Moore

. June 30, 1970

_RESULTS CONTINUED The Commonwealth of Pennsylvania Law states that in blasting operations the

" Peak Particle Velocity" of the ground shall not exceed 2.0 inches per second in any one of three mutually perpendicular planes, in the vertical and horizontal directions, at the immediate location of any dwelling house, public building, school, church, commercial or institutional building.

Tabulated below are the measurements resulting from this blast.

SEISMOGRAPH MAXIMUM NO. &

COMPONENT VELOCITY LOCATION (in g

1. 1/8 Transverse 1.60 Quarry Vertical 1.50 Location Longitudinal 1.90

1. 151 Transverse 0.03 ~

Proj ect Vertical 0.02 Site Lonoitudinal 0.02 Note:

The safety of the recorded vibration

- - effects is further substantiated by the New Jersey and Massachusetts Blasting Codes.

. CONCLUSIONS 4

According to all recognized damage indices, the recorded vibration effects from the subject blast were below that necessary to cause structural damage to even old pre-stressed plaster, normally the weakest material of construction, at the seismograph stations, in the immediate vicinity of the stations, or beyond the seismograph stations in the same general direction and also conforined to the Pennsylvania State Law governing blast vibrations.

Respectfully submitted, VIB,RA-TECH ENGINEERS, INC.

\\ L Ah J.bbnJ.besetar Field Engineer

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d BLAST AND SEISMOGRAPHIC REPORT

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CiientD. AM E h....I.dco.Cf,.............................. ope ra eion.

). MEA.l.4K....bEff.D//.p. 5.Mi 0 (Job Loc.ation)

Specifie Blast Location 66.l... N...

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Date.........6.r..L$.~10........,..... Time of Bi,t....\\.l.':

Blast No.....

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h.."ic" (cro.c.rual notes......l.9...... Hoie Diameter.....6.71........... Ayerage Depth.

no. of ss out one)

Ayerage Subgrade Drilling...........k............... Hole Spacings.......$.4 Burde ns....... D l Ayerage Stemming to Top Charge......l.E........ Type and Delay Nos. Used.d.h....E.6 IC?.. 5.9 D eekin g In f o r m a tion (if any).................................

Total Weight of Explosives.h.h.)..!...........Lbs.

Averaq Explosives Load per Hole....M.k.........Lbs.

Make and Ty e oi Explos,iy,,esD.h.0N.)..bMA.\\$.X...N.O.b...).0,,1,$],,,,,,,,,,,,,,,,,_.,,,,,,,,

A...c....V...,..P...p'...s..s 5.0......eep.\\..P....eg... ge.t. s...r

• Maximum Amount of Explosives Per Firing Period.........h.b.h..................

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.....Lb s.

If Supplementary Holes, Snake Holes, etc., were used give information as above.

Weather and Sky Conditions..b.S.$.k..........

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BLAST AND SEISMOGRAPHIC REPORT

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N...N... '".. 3.7.dC.W.M...M...b0.M....b.d.-SE.

Speeific B1ast Location B l a s t No................................ Da t e..........h..~.

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D e ck in g I n io r m a tion (i f any).........................................................................

Total Weight of Explosi.ves h.h.)..!...........Lbs.

Avera Explosives Load p :: Hole..b.k.......Lbs.

..A...o....4Tyge of ExplosgesD h.0N.).b.W.6.EX......*[.@.b.).0,,h,$,],,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

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Decembcir 12, 1979

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Mr. J. R. Reiney, Jr.

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Dear Mr. Reiney:

VME-Nitro

• Consult has revic Nd?t'he., photographic tape and data

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l shcots portaining' to a; quarry' bl'a'st."on. April 8,1976 at 12:15 PM.,

1 the tape is identifiable wit 1Y!th.e te.p'c print-out submitted with the data shcotis.

The scalp tiloughflisticd as.25 on the data sheets is not confirmable on the original ~tiape.

This indicates the following:

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.... nl [.....2j.'.".y Particle velocity Plane Longitudinal J

.28 inches per second Vertical

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.19 Transverse

.32 Resultant

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The data sheet indicates that the sca' led distance for this shot was:

20.4.

For trap rock, the above particle velocitics appear modcrate to low.

Sincoroly, MLh.'..\\.

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FIELD TEST DATA

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2. Send one copy to your home office file.

1 Keep one copy on job for ready reference, FOR SEISMOGRAPH

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4. Seis range for velocity recorder only.

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i Recording NoESC-ll.5 - 1 O.[-7 6 se,s. NoYED-4.S__ G-21 4-t~

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