Strata Mechanics
Strata Mechanics
HORG : RAJENDRA SINGH
 
Unique knowledge base of geo-mining conditions of Indian coalfields enabled this group to device an efficient engineering approach for underground mining and helped the industry in enhancing value of the reserve and establishing new business plan. This group has successfully completed different important in-house and industry-sponsored projects (including nine S&T projects of the Ministry of Coal, Govt. of India and two foreign collaborative projects), development of some popular methods of mining for safe and clean extraction of difficult coal seams. These developments have received appreciations from the associated industry and academicians and resulted in considerable number of publications in the best rock-mechanics/mining engineering journals. This small group has earned a number of prestigious honours / awards in the area of rock mechanics and mining methods. The contributions are well proven and, almost all coal mining industry of the country are doing business on the basis of R&D outputs of this group.  
 
This is a group of scientists working, mainly, for safety and efficiency of underground coal mining. Applications of the basic rock mechanics principles for improvement in practical mining conditions are thrust area of this group. There are total four Group-IV scientists (two Ph D's and two M Techs), two senior technical officers (one PhD and the other M Sc) in the group. With a multi-disciplinary manpower [dominated by Mining Engineers], this group has developed good knowledge base and experiences of Indian coalfields to deal with the safety and efficiency problems of underground coal mining. 
 

 


Strata Mechanics
Strata Mechanics :
This section is working to utilisethe basic rock mechanics principles to address theproblems of underground coal mining. Consistent involvement in different geo-technical investigations helped in developing good understanding of geology and rock mass characteristics for an efficient design of the underground mining structures.This sections has made significant R&D contributions in the thrust area (underground coal mining) of CSIR-CIMFRon the basis of following available skill and expertise:
1. Knowledge and understanding of geo-mining conditions of Indian coalfields for efficient design of underground mining structures.
2. Expertise to deal with strata-mechanics problems of underground mining of thick/difficult coal seams.
3. Skill and expertise for underground instrumentation/monitoring and analysis of stratacontrol parameters.
4. Simulation (physical and numerical) skill for strata mechanics investigations
5. Knowledge and experience to design geo-technical elements of continuous miner based mechanised depillaring of the existing rectangular/square pillars.
 
Mandate of the Section:
R&D for safe and efficient underground coal miningof a difficult coal seam, utilising basic principles of rock mechanics and ground control. Extensive laboratory testing including study on simulated models (both, physical and numerical) and field studies are basic tools of the sectionto study the response of rock-mass underthe redistributed state of stress conditions of an underground excavation for an efficient design of different mining structures.
 
Important Achievements of the Section:
Strata Mechanics section of CSIR-CIMFR has made significant contributions in development of the award winning mining methods like - cable bolting based depillaring of thick seams in single lift and wide stall mining. Our recently developed mining methods like: “Underpinning based simultaneous extraction of contiguous sections under fragile parting” and “Cross development based underground extraction of a critically thick coal seam standing on pillars and the development made along the roof horizon” have added new dimension in the field of optimal underground extraction of thick and contiguous coal seams of the country. Based on simple ideas and results of simulations, conventional superimposed bottom section development of a thick coal seam (already developed along roof horizon) was replaced by staggered one by this section for depillaring of complete thickness of a thick seam in single lift by Blasting Gallery (BG) method. Improved stiffness of natural support through staggered development of the bottom section arrested strata control problems, which were often encountered by the conventional superimposed development based BG method. Mechanisation and automationof underground coal mining falls under current research activitiesof the sectiont. Considering uniqueness of our site conditions, a model is developed for the rib designin mechanised depillaring of rectangular/square pillars. The section has made, at least, two successful efforts to replaceimported approach by an indigenous design. In fact, one of such effort of the sectionhas made national record of coal production from a depillaring panel. The section also made valuable contributions for automatic measurement of strata deformation,nature and amount of stress redistribution during underground coal mining, online monitoring and analysis of strata control parameters, coal mining of deep seated deposits andcuttability of Indian coal seams with special emphasis on coal seams with igneous intrusions.
Thissection of CSIR-CIMFR collaborated with the University College London and developed vision system for automatic spatial information extraction through active triangulation and monitoring of hazardous areas of underground mines. A joint research project under ASCR, Czech Republic - CSIR, India (2009-2014) is recently completed on “Rock mechanics investigations to meet challenges of strata control of deepunderground coal mining. Under this joint project,the potential of de-stress blasting is successfully demonstratedto mitigate coal bump/rock bursts problems and to manage hard and massive roof strata. Considering advantage of experiences of coal mining, available atCamborne School of Mines (CSM), UK, this section of CSIR-CIMFR established a goodco-operation with this institute to built-up scientific and technical knowledge for future coal mining problems in Indian coalfields.

NameDesignationEmail & phonePhoto
Head of the Research Group
Dr. Rajendra Singh

Briefbiodata
Head of Section & Chief Scientist E-mail : rajendra@cimfr.res.in, rsingh1_2@ yahoo.com
Phone : +91-326-2296043 (O), 09334245661(M)
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Section 1: Strata Mechanics
Dr. Arun Kumar Singh

Briefbiodata
Principal Scientist
Research Group: Strata Mechanics
E-mail : arun@cimfr.nic.in, aksingh72@ yahoo.com
Phone : +91-0326 2296043 Extn. 4333(O)
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Mr. Rakesh Kumar

Briefbiodata
Principal Scientist Phone : +91-0326 2296043 / Extn. 4328 (O) Service image
Mr. Ashok kumar

Briefbiodata
Scientist
Research Group: Strata Mechanics
E-mail : ashok@cimfr.nic.in, ashok.bhu.min09@gmail.com
Phone : +91 326 2296043 / Extn. 4326 (O)
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Mr. Sahendra Ram

Briefbiodata
Senior Technical Officer E-mail : sahendra18@gmail.com
Phone : +91-0326 2296043 (O), 0326 2396258 / Extn. 4235
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Mr. Amit Kumar Singh

Briefbiodata
Senior Technical Officer E-mail : amitcmri@ yahoo.co.in
Phone : +91-326 2296043 / Extn. 4328
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Section 2: Nonconventional Gases
Dr. Harendra Singh

Briefbiodata
Sr. Principal Scientist E-mail : hsingh@cimfr.res.in, hsingh86@ yahoo.com
Phone : +91-0326 -2296027/28/29 (O)
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Dr. V.A.Mendhe

Briefbiodata
Principal Scientist E-mail : avmendhe@ yahoo.com
Phone : +91-0326 -2296027/28/29/4352 (O)
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Mr. J. Kispotta Sr. Scientist
Research Group: Strata Mechanics
E-mail : johnkispotta@cimfr.nic.in, jk_cimfr@rediffmail.com
Phone : +91 94711 62559, +91-326 -2296027/28/29 / Extn. 4416 (O)
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Dr. D. Mohanty

Briefbiodata
Sr. Scientist E-mail : drdmohanty@cimfr.res.in
Phone : +91-0326 -2296027/28/29 / Extn. 4343 (O)
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Mr. Jaywardhan Kumar

Briefbiodata
Scientist E-mail : kumar.jaiwardhan@gmail.com
Phone : +91-326 2296007 / Extn. 4346 (O)
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Mr. KK. Singh Senior Technical E-mail : singh.kk1315@ gmail.com
Phone : +91-326 -2296027/28/29 / Extn. 4317
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12 Results
Sl. No.A brief description of Facilities/ Equipment/Tools/software with photos
Section 1: Strata Mechanics
1

A List of Important Facilities and Infrastructure:
 

 1.   Facilities for numerical and physical simulations,

 2.  Bore-hole penetratometer (40 m length)

 3.  Data logger based instrumentation facility for strata movement study

 4.  Automatic total station (Leica)

Strata Movement Studies In Laboratory on Physical Models

Field and laboratory studies for the design of mining structures during CM based mechanised depillaring

Nature and amount of strata movement of laminated and massive roof strata and corresponding stress development over the natural support. 

Results of numerical simulation showing plan view of stress concentrations over a rib/snook (of three different sizes) after one and four rows of pillar extractions.

Appropriate strategy of staggered bottom section development (plan & section) for efficient underground extraction of total thickness of a thick coal seam in single lift by BG  method. 

Superiority of  cable bolting based thick seam mining (developed by CIMFR) over the BG method and a photo of cable-bolted gallery during the field trial . 

Underpinning based simultaneous extraction of thick and contiguous sections with thin and laminated parting.

Concept o f wide-stall mining and its comparison with conventional splitting/stooking for optimisation of the coal recovery below surface or sub-surface constraints 

 

Section 2: Nonconventional Gases
1
 
Sl. No.NameSponsorDurationObjectiveMajor output(if any)
Section 1: Strata Mechanics
1Scientific study for suggesting appropriate method of final extraction of No. 3 seam at Bartunga Hill Mine, Chirimiri Area, SECLSouth Eastern Coalfield Limited, SECLFrom 16.12.09 to 15.12.11

Study for suggesting appropriate method of final extraction of No. 3 seam at Bartunga Hill Mine, Chirimiri Area, SECL

On the basis of field and laboratory investigations (simulation), different possible method for final extraction of No. 3 seam is compared and finally an appropriate method of mining for the seam extraction is suggested. 

2Advice for installation of extensometer, its monitoring and analysis of the observed data over the caving panel at KTK1 Incline mine, BHPL area, SCCL.Singareni Collieries Company Limited, SCCLFrom 09.06.11 to 08.06.11

Advice for installation of extensometer, its monitoring and analysis of the observed data over the caving panel at KTK1 Incline mine, BHPL Area, SCCL.

As per the existing site conditions, an extensometer is designed for monitoring and analysis process of bed separation in the roof horizon during depillaring of seam.

3Performance evaluation of cable bolting based depillaring method for underground extraction of panel LK-1(A) of Lower Kajora seam through underground instrumentation and monitoring at Central Kajora Colliery, ECL.Eastern Coalfield Limited, ECLFrom 05.07.12 to 04.07.14

Performance evaluation of cable bolting based depillaring method for underground extraction of panel LK-1(A) of Lower Kajora seam through underground instrumentation and monitoring at Central Kajora Colliery, ECL

Manner of extraction, support density, safe withdrawal limit value of stress, convergence and load is suggested for better production, productivity and safety of the mine.

4Performance evaluation of Limited Span method for underground partial extraction of 50LN panel of Patpahari seam through underground instrumentation and monitoring at Bhatgaon Colliery, SECLSouth Eastern Coalfield Limited, SECLFrom 08.02.13 to 07.02.2016

Performance evaluation of Limited Span method for underground partial extraction of 50LN panel of Patpahari seam through underground instrumentation and monitoring at Bhatgaon Colliery, SECL

Manner of extraction, support density, safe withdrawal limit value of stress, convergence and load is suggested for better production, productivity and safety of the mine.

5Design of suitable method of depillaring including widening and heightening of existing galleries for working of panels B5 and B6 of No. 1 seam at GDK-11 Incline mine, RG-I Area, SCCL along with underground instrumentation and monitoring during extraction of the panel.CATTERPILLAR GLOBAL MINING EUROPE GmbH-IPO (Earlier known as Bucyrus Europe GmbH-IPO)From 22.02.13 to 21.02.2015

Design of suitable method of depillaring  including widening and heightening of existing galleries for working of panels B5 and B6 of No. 1 seam at GDK-11 Incline mine, RG-I Area, SCCL along with underground instrumentation and monitoring during extraction of the panel.

On the basis of field and laboratory investigations (simulation), design of different basic elements of the mechanised depillaring like rib/snook, roof bolt based breaker-line etc. for the Continuous Miner based depillaring is done for better production, productivity and safety of the mine.

6Advice on precise measurement, 3D modelling of coal heaps and coal volume computation at Bhubaneswari OCP, MCL.Mahanadi Coalfield Limited, MCLFrom 15.03.13 to 14.03.15

Advice on precise measurement, 3D modelling of coal heaps and coal volume computation at Bhubaneswari OCP, MCL

Precise measurement, 3D modelling of coal heaps and coal volume computation at open cast mines is done by surveying and using a software.

7Performance evaluation of cable bolting based depillaring method for underground extraction of panel K-6(A) of Kajora top seam through underground instrumentation and monitoring at Madhusudanpur 7 Pit and Incline Colliery, ECLEastern Coalfield Limited, ECLFrom 18.03.13 to 17.03.15

Performance evaluation of cable bolting based depillaring method for underground extraction of panel K-6(A) of Kajora top seam through underground instrumentation and monitoring at Madhusudanpur 7 Pit and Incline Colliery, ECL

Manner of extraction, support density, safe withdrawal limit value of stress, convergence and load is suggested for better production, productivity and safety of the mine on the basis of field and laboratory investigations.

8Performance evaluation of cable bolting based depillaring method for underground extraction of panel LK-2 of Lower Kajora seam through underground instrumentation and monitoring at Central Kajora Colliery, ECL.Eastern Coalfield Limited, ECLFrom 03.05.13 to 02.05.16

Performance evaluation of cable bolting based depillaring method for underground extraction of panel LK-2 of Lower Kajora seam through underground instrumentation and monitoring at Central Kajora Colliery, ECL.

Manner of extraction, support density, safe withdrawal limit value of stress, convergence and load is suggested for better production, productivity and safety of the mine on the basis of field and laboratory investigations..

9Advice on precise measurement, 3D modelling of coal heaps and coal volume computation at open cast mines of MCL.Mahanadi Coalfield Limited, MCLFrom 16.06.13 to 15.06.15

Advice on precise measurement, 3D modelling of coal heaps and coal volume computation at open cast mines of MCL.

Precise measurement, 3D modelling of coal heaps and coal volume computation at open cast mines is done by surveying and using a software

10Strata control studies based advice for safe depillaring in Continuous Miner panel CM1of L1B seam at Pinoura Mine, SECL.SMS Infrastructure LimitedFrom 24.06.13 to 23.06.16

Strata control studies based advice for safe depillaring in Continuous Miner panel CM1of L1B seam at Pinoura Mine, SECL.

On the basis of field and laboratory investigations (simulation), design of different basic elements of the mechanised depillaring like rib/snook, roof bolt based breaker-line etc. for the Continuous Miner based depillaring is done for better production, productivity and safety of the mine.

10 Results