DGMS Circulars - Technical. Standards and Safety Provisions of Diesel Equipments for using in belowground coal and metalliferous mines. - (ALL . DGMS. D.G.M.S. CIRCULARS (Upto June ). Sl. No. Description Mine codes—With the introduction of computers in the office of DGMS, every mine has . Most of the Circulars are in PDF format and would require Adobe Acrobat Reader , This can be freely downloaded and installed from the link below: Download.
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DGMS (Genl) Circular no. 2 of Maintenance of flame safety lamps. DGMS( Tech) Circular no.1 of Use of vital safety itmes in mines. (PDF format). Most of the Circulars are in PDF format and would require Adobe Acrobat Reader , This can be freely downloaded and installed from the link. Notes contain complete compiled DGMS Circular along with National Safety Conferences in a single PDF file. CLICK ME TO.
A three-layer, feed-forward back propagation neural network consists of 6 input parameters, 5 hidden neurons, and one output parameters were trained. Obtained results were compared based on correlation of determination R2 and standard error between recorded and predicted values of PPV.
Keywords: ground vibration monitoring, wireless sensor network, peak particle velocity, multivariate regression analysis, artificial neural network. Introduction Extensive research has been carried out on blasting and its adverse effects on nearby important structures.
Blasting is an essential component for fragmentation of the overburden and mineral deposits. It is a more economical process for mining rock excavation.
Extreme levels of structural vibration triggered by ground vibration from blasting can result in damage to or failure of structures . Ground vibrations are acoustic waves that propagate through the rock. They differ from the ground vibrations caused by earthquakes in terms of seismic source, the amount of available energy and traveled distances . The generated seismic waves can damage the surrounding structure and livelihood thus it is essential to monitor and predict the blast-induced ground vibration in mines.
Ground vibration is influenced by a number of parameters such as explosives characteristics and blast design . Normally, PPV is one of the most important parameters adopted for evaluation of ground vibration and associated damage.
Different researchers were proposed a number of vibration prediction equations and all these equations estimate the PPV mainly based on two parameters: maximum charge used per hole and distance between blast face . The existing systems like Instantel Minimate plus, Micromate, Blastmate-II are generally used to monitor ground vibrations in mines . The existing blast-induced ground vibration monitoring systems are of wire-based systems for acquiring and transferring the field data.
In addition, the wire-based systems can only be applied to a limited area and the system becomes incapable if damages occur to the wires, which happens frequently . The conventional vibration sensors composed as depicted in Fig.
Depending on the type, it has 1 to 8 input channels. Generally, in a surface mine, maximum one blast has been done per day. So, the problem with conventional vibration sensors is that if vibration needs to measure at several points different positions , requires additional geophone sensors, which are expensive or if single geophone has considered, data collection was tedious and time-consuming. To study progressive caving behaviour of roof strata in the goaf with face retreat, at least three 3 multi-point Borehole Extensometers shall be installed from the surface along the central line of the longwall panel at not more than m interval.
In case of presence of goaved-out workings in the overlying seams vertically above the longwall panel, the location and interval between such Extensometers may vary to the extent that may be required to avoid drilling of boreholes through such goaved-out workings.
Subsidence survey and maintenance of its records shall be done as per the DGMS circular no 4 of or its revised version. A part plan of the longwall workings depicting strata monitoring instrumentation with suitable index, shall be kept and maintained in the office of the mine. In every longwall panel, strata monitoring plan shall be kept under the charge of an Assistant Manager holding 1st Class Manager's Certificate of Competency with relevant experience in longwall, who shall also be assisted with adequate number of trained supervisors and manpower.
The owners, Agents and Mangers of all coal mines having longwall workings are advised to ensure compliance with this circular. DGMS Legis.
Standards of illumination in opencast metalliferous mines Sir,. In pursuance of Regulation 2 of Metalliferous Mines Regulations, , the standards of illumination to be provided during working hours at different places or areas where natural light is insufficient in opencast metalliferous mines have been specified vide Government notification no.
The said Notification is reproduced below for guidance and strict compliance in ail opencast metalliferous mines. The mine lighting should be designed and installed with proper lamps and fixtures in regard to height, orientation, spacing and reflectors or other accessories, so as to secure a uniform distribution of light on the work area for visual comfort and avoiding objectionable shadows, sharp contrasts of intensity, glare, light clutter excessive groupings of light and light pollution to prevent strain on the eyes of the workmen, work fatigue and medically defined stress.
At strategic locations like electric substation, and any other places as determined by the Manager, emergency lighting arrangement by separate source shall also be provided. Where the width of haul roads is more, the lighting arrangements shall be provided either by rows of lights erected on both sides of the road or by a centrally erected row over the divider, so as to maintain illumination as per standard.
It shall also be ensured that adequate light reaches up to edges of the active dump. Illumination Plan: Where any area of the mine is not in use or not needed to be lighted, the same shall be clearly marked and demarcated on the plan with reasons to be recorded.
The plan shall be kept signed and dated by the surveyor and the official authorized for maintaining the Sighting standard and countersigned and dated by the manager.
This Circular supersedes all the earlier Issued Circulars on Standards of illumination in opencast metalliferous mines. In pursuance of Regulation 2 of Coal Mines Regulations, , the standards of illumination to be provided during working hours at different places or areas where natural light is insufficient in opencast coal mines have been specified vide Government notification no. GSR E , dated The Notification is reproduced below for guidance and strict compliance in all opencast coal mines.
GSR, dated 18th June, , published in the Gazette of India Part II, Section 3 i on 28lh June, , hereby specify that the standards of lighting to be provided during working hours at different places or areas, where natural light is insufficient in opencast coal mines shall be in the manner as specified in the following table and in conformity with the general guidelines for illumination mentioned thereunder:.
Serial No. In case of haul roads, orientation of light fittings should be kept so adjusted as to have emittance of light across the road and not along the road.
It shai! The plan shall be kept signed and dated by the surveyor and the official authorized for maintaining the lighting standard and countersigned and dated by the manager. This Circular supersedes all the earlier issued Circulars on Standards of illumination in opencast coal mines. Flag for inappropriate content.
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