Systematic Drilling and Blasting for Surface Excavations Part 15 ppt

Pre -split blast holes shall be detonated prior to drilling and blasting the adjacent rock except when conditions will not permit this method or when it can be demonstrated to the satisf

EM iiiO-2-3800

i Mar 72

one-fourth the blast hole depth Stemming may be required between each explosive charge in areas where the rock contains open seams, joints or faults Pre -split blast holes shall be detonated prior to drilling and blasting the adjacent rock except when conditions will not permit this method or when it can be demonstrated to the satisfaction of the Contracting Officer that in special cases a millisecond delay system will produce acceptable rock surfaces.

1-5 Seismic Monitoring Specifications, Milton Freewater Quarry.

3-03 BUSTING FOR QUARRY OPERATIONS.

a. General: All blasting operations shall be per-formed in accordance with the applicable provisions of Corps of Engineers Manual EM 385- 1-1 dated 13 March “

1958, entitled ‘ ‘General Safety Requirements” and supple-mented by North Pacific Division Supplement, dated 15 July i960 The Contractor shall furnish to the Contracting Offi-cer prior to each blast a plan of all blast holes showing pat-tern and depth of drilling, type of explosive used, loading pattern, and sequence of firing This plan shall show all holes, charges and existing quarry face relative to quarry boundaries by dimensions and elevations in feet The drilling and blasting plan is for record purposes only, and will not absolve the Contractor of his responsibility for using proper drilling and blasting procedures If the Con-tractor selects and operates a quarry within one mile of any residence, building or bridge subject to vibration dam-age by blasting, the Contractor’s blasting operations shall

be subject to the requirements of paragraphs 3-03 & and 3-03 ~., below.

b Monitoring: All blasting for quarry operations that are within one mile of any residence, bridge, or building shall be monitored for each blast No separate payment will

be made for blasting or monitoring blasts in the riprap quarry, and all costs thereof shall be incidental to and in-cluded in the applicable Item No 7, ‘ ‘Riprap, Class I,”

Item No 8, “Riprap, Class H,” or Item No 9, “Riprap, Class ILI ” For the initial blast of the quarry, the quantity

of explosive shall be limited to an amount which will not cause damage to buildings, bridges, or private property in the area When ground characteristics for any specified

B-ii

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APP B

blasting location have been determined from the initial blast

by instrumentation, the allowable qua,ntit y- distance relations between the amount of explosives used and the distance from the blast site shall be determined from the accepted results

of instrumentation at the given operation for the various weights of explosives The vibration measurements at the nearest building or dwelling shall not exceed a total Energy Ratio of i O Recordings shall be taken at all of the most critical locations The Energy Ratio in a single direction

Ratios in three mutually perpendicular planes of motion Reference: Safety Regulation No 23, dated 20 August 1965, State of New Jersey, Department of Labor and Industry,

Trenton, New Jersey.

c Seismograph: The Contractor shall have a fini-mum of &o approved seismograph instruments for moni-toring blasting operations (see exception, paragraph 3- 03a) Additional instruments will be required if found necessary Locations of instruments shall be subject to the approval of the Contracting Oficer Seismographs for monitoring of quarry blasting shall be placed at opposite locations Each seismograph instrument shall be capable of recording photo-graphically all three components of ground motion The recorded data shall include for each shot:

(1) (2) (3) (4)

(5)

Distance

detonation.

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APP B

(7) Duration of motion in excess of one- one

thousandth of an inch.

second.

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EM ili O-2-3800

Index

1 Mar 72 INDEX

Al,,n,,nlzed slt,rr,, 3-19

Ammonia:

Ammon]t]m:

Blasting:

cav, 3-21-3-24

damage, 2-1, ; i-~-18

Bt, rden, 5-1 5-4

Cartridge:

Cl), krn drills, 4-8, 4-11

Con>hus!ibles 3-Q

Coni>ned veloclty 3-5

Della zrati On, 3-1

Delar:

Veloclty. 3-1 3-4-3-5, 3-o

Drag bit, 4-5

Drill bits 4-1,4-4-4-8

Explos Ivti 2-1, 3-1 ba~e, 3-7, 3-II

Fuel oil 3-9

Gelat, ns 3-13-3-16

Ground:

coal. 3-Q vibrations, 7-5-7-16

Hammer:

bits, 4-8-4-10 drills 4-8-4-15

3-12

Hoop stresses, 2-3

I-i

a

EM lii O-2-3800

Index

i Mar 72

.,

JO1ntinK. 6-4 6-7

3-lZ-3-13

Millisecond:

connector, 3-23-3-24

Prill, 3-!7

R,prap 5-24 Rock [111S. 5-25-5-26

Safety 1- 1-1-2

Seismic:

Sl, trry:

Sodium:

nitrate, 3-9

Stra!ght:

Subdrilling, 5-11-5-12

Water:

gels, 3-18

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