Re: DGMS Mailing List: MMR - Oral Question 2014

6:18:00 pm

Mining Engineer

I am covering my portion: Hope other do some help

What is limit of ground vibration

Varies for different structures belonging to the owner and not belonging to the owner and frequency of the ground vibrations- See details below

Criterion for fixing of threshold vibrations for different structures (DGMS Tech Cir No. 7 of 1997)

Type of Structure	Dominant Excitation Frequency, Hz
Type of Structure	*< 8 Hz*	*8 - 25 Hz*	*> 25 Hz*
*(A) Buildings / structures not belong to owner*
(i) Domestic houses / structures (Kuchha, brick & cement)	5	10	15
(ii) Industrial Buildings (RCC & Framed Structures)	10	20	25
(iii) Objects of historical Importance & sensitive Structures	2	5	10
*(B) Buildings belonging to owner with limited span of life*
(iv) Domestic houses / structures (Kuchha, brick & cement)	10	15	25
(v) Industrial buildings (RCC & framed structures)	15	25	50

>Slipping hole

Is it sleeping hole?
>Fly rock

it is a rock fragment projected under impulse from expanding gases to unwanted distances and has a potential to damage, injure and cause fatalities. The current danger zone is placed at 500 m (consequence based) by DGMS
>Control blasting

The term is loosely used for control of parent rock damage (that falls in contour blasting regime) but involves control of ground vibration, air overpressure and flyrock.
>Satellite holes

Satellite holes are shallow holes drilled in between the production holes and filled with small quantities of explosive to break the rock in stemming zone. Practiced in mines where large boulders emanate from the stemming zone after blasting.

Dr. A K Raina

---In dgms_mail_list@yahoogroups.com, <kumarprabhat1970@gmail.com> wrote :

FMR W&W Prabhat Kumar Oral Questions, 1. what is the speed of dumper in mines by which circular. 2. How much tippers required for 4.5m bucket capacity.

On Thu, Mar 6, 2014 at 3:37 PM, shashank dixit <sdixit2009@yahoo.com> wrote:

I was asked in FMR
Parameters which decides the slope of a mine, pit slope stability, Pit Slope Angle , final pit slope with a very deep discussions.

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On Fri, Feb 28, 2014 7:35 PM PST Siddalingappa T wrote:

>Dear friends,
>i have attend oral exam of SMR
>
>1) Duties & Responsibalities of forman
>2) traffic rule
>3) haul road
>4) risk assisment
>5) types of accident in mines
>
>with regads
>siddalingappa
>
>
>
>On Friday, February 28, 2014 4:11 PM, Kandarp Rami <kkrami@gmail.com> wrote:
>
>
>In w&w
>What is limit of ground vibration
>Slipping hole
>Fly rock
>Control blasting
>Satellite holes
>On Feb 27, 2014 5:01 PM, <indian1989@ymail.com> wrote:
>
>
>>
>>Please discuss your oral questions which was asked by the examiner. It ll very helpful to all miners.
>>Regards,
>>K.Dinesh

--
Prabhat Kumar
Asst.Mines Manager

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Directorate General of Mines Safety, Ministry of Labour & Employment, Govt. of India
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