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Drilling and blasting

Notes

Mechanical(First year) 10EME14

GE2116 ENGINEERING PRACTICES LABORATORY

CE2305 FOUNDATION ENGINEERING

Nitte Meenakshi Institute of Technology, Bangalore

Questions


I n underground face blasting, the pull is found to be 10% less than the drillhole length. The headings of 3.6 m width are supported by prop density of 1.44/m2. The hole length is 1.5 m, and 6 rounds of blasting are done in the panel per shift. The number of props to be erected in a shift is ____________________.
1 Answer

A 20 mm HSS drill with a point angle of 118 ̊ is used for drilling a through hole on a metallic plate of thickness 100 mm with a cutting speed of 333.33 mm/s and feed of 0.22 mm/rev. Assuming that the drill is touching the surface of the plate at the start, the drilling time (in s) is closest to
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Match the following features with the mining methods:
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D uring bench blasting in a quarry, 50 kg of an explosive with a yield of 5 MegaJoule/kg is required to break 100 m3 of marble. In this case, the energy expended in breaking a unit volume of marble in MegaNewton/m2 would be _________________.
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For a dam site investigation, drilling was carried out up to a depth of 20 m. The total length of recovered core pieces, each over 100 mm, add up to 16 m. The Rock Quality Designation (RQD) of the foundation rock mass is __________%.
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A through hole is drilled in an aluminum alloy plate of 15 mm thickness with a drill bit of diameter 10 mm, at a feed of 0.25 mm/rev and a spindle speed of 1200 rpm. If the specific energy required for cutting this material is 0.7 N·m/mm3 , the power required for drilling is ______ W (round off to two decimal places).
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Which one of the following is INCORRECT about oil based drilling muds? (A) Good rheological properties at higher temperatures (as high as 250 oC) (B) Effective against corrosion (C) Detection of gas kick is difficult (D) Less inhibitive than water based muds Gate-2018-General-Aptitude
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The main source of error in computing the orientation of planar features from drill cores is -gate Geology & Geophysics 2017
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I n a sublevel stope, 20 m high excavation is made with ring drilling in a 6 m wide orebody. In an effective shift time of 6 hrs, three rings are blasted resulting in 9 m extraction length. LHDs of 5.0 m3 bucket capacity and cycle time of 5 minutes are used for ore transportation. The number of LHDs required for this operation is _________________.
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The purpose of a boring operation in relation to a drilling operation is to
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Match the following:
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Primary and secondary indicators of kick in a well where the indicators are: Gate-2018-General-Aptitude
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In a drilling rig, the crown block and the traveling block have three and two sheaves, respectively. A single wireline connects the hoisting drum to the deadline anchor as shown in the figure. Neglect the weight of the pulleys and the wireline, and friction between the sheaves and wireline. The ratio of the deadline load to static crown load is _______ (round off to 2 decimal places).
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For item 5, you will demonstrate an understanding of logical progression and completeness. Read the paragraph. Choose the sentence that does NOT belong in the paragraph.
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T aylor’s tool life equation is used to estimate the life of a batch of identical HSS twist drills by drilling through holes at constant feed in 20 mm thick mild steel plates. In test 1, a drill lasted 300 holes at 150 rpm while in test 2, another drill lasted 200 holes at 300 rpm. The maximum number of holes that can be made by another drill from the above batch at 200 rpm is ______ (correct to two decimal places).
1 Answer
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