Prasnna Jain

National Institute of Rock Mechanics Bengaluru · Engineering Geology

Geological and geotechnical evaluation for the 7–9 m diameter and 100 m length, 10 numbers of parallel draft tube tunnels were carried out. The draft tubes are constructed to connect the underground pump house and surge pool for lifting the water. Due to adverse geological conditions and the complex geometry of the structure, a sequential excavatio...

Southern Districts of Telangana State of India are the worst drought-prone and distressed areas. There is a tremendous shortage of drinking water, as these are fluoride-affected areas. As a result, a large part of the population of these districts is being forced to migrate to other parts of the country. In view of the drought situation in the area...

Detailed engineering geological investigations were carried out for a railway tunnel which was constructed more than two decades ago. 3D engineering geological mapping was carried out using Brunton Compass and Total Station Surveying instruments in 1:100 scale. Coarse-grained pink and grey granite, hornblende-biotite gneiss and dolerite dyke of Arc...

Safe and economical subsurface excavation requires a holistic assessment of the ground. Possibilities of stress-induced and structural failures need thorough consideration before excavation. Over-supporting an excavation is uneconomical while under-supporting can lead to disastrous results. Thus, in this research, an attempt has been made to devise...

The Palamuru-Rangareddy Lift Irrigation Scheme (PRLIS) is being constructed to lift water in five stages by pumping it from the foreshore of Srisailam reservoir on the Krishna River (FRL +269.735 m) to K.P. Lakshmidevipalli reservoir (FRL +670 m) in Telangana State. Underground pump house caverns are being built to lift 2.0 TMC of water per day for...

Kaleshwaram Lift Irrigation Scheme (KLIS) is a multipurpose scheme of the Telangana State, India to lift water from the Godavari River. The purpose of the scheme is to cater water for upland drought-prone districts. The approximate lift height of the scheme is 530 m. Barrages, water conveyor systems, and distributary networks are the main component...

Engineering geological investigations for excavated cut slopes for the intake pool of Polavaram multi-purpose project were carried out. The rocks exposed in the area belong to the Khondalitic Suite of Eastern Ghats Mobile Belt. The prominent rock types in the area are garnetiferous sillimanite gneiss, quartzo-felspathic gneiss, charnockite with int...

Tunnel Boring Machine projects face several difficulties: reliability, availability, and optimum productivity. Predicting machine performance is one of the most important issues. Improper forecasting may necessitate rescheduling of the entire project, resulting in a significant cost overrun. The Rock Mass Rating (RMR) system, which is commonly used...

The Palamuru-Rangareddy Lift Irrigation Scheme (PRLIS) is being constructed to lift water in five stages by pumping it from the foreshore of Srisailam reservoir on the Krishna River (FRL +269.735 m) to K.P. Lakshmidevipalli reservoir (Full Reservoir Level (FRL) +670 m) in Telangana State. Underground pump house complexes are being constructed to li...

Detailed engineering geological and geotechnical investigations were carried out for the delivery mains for assessment of rock mass properties and to provide a sound support system. Seven numbers of delivery mains are constructed which are an important component of the pump house complex for lifting water from the pump house to the delivery cistern...

Underground pump house cavern for the lifting of 2.0 TMC water per day is being constructed in the Telangana State of India. Concurrently with the excavation of the pump house, 3D engineering geological mapping was carried out of the heading portion for rock mass classification and recommendation of support. The direction of the longest axis of the...

For better rock mass characterization, 3D engineering geological mapping and in-situ testing was carried for the heading portion of surge pool of Palamuru Ranga Reddy lift irrigation scheme lift-II. The direction of the longest axis of the surge pool cavern was finalized based on the in-situ hydrofracturing testing inside the borehole and aligning...

Engineering geological investigations for the heading portion of the 104 m long, 56.95 m high and 25.20 m width underground extended pump house was carried out for a lift irrigation scheme in Telangana State, India. Rock types recorded were coarse grained, hard and jointed pink granites and basic dyke belongs to the Peninsular Gneissic Complex of A...

Engineering geological investigations of the pump house foundation are essential to ensure the safety of structure. At the Warangal (Urban) district of Telangana State pump house shaft is being constructed to lift 40.60 cumecs of water. This paper discusses the results of the engineering geological investigations that have been carried out at the f...

Engineering geological and geotechnical assessment of the dam foundation are essential for the design of the dam to ensure safety. At the southeastern part of Karnataka, Yaragol gravity dam is being constructed, which is designed based on site geomorphological and geological conditions and economic reasons. This paper discusses the results of the e...

Underground surge pool cavern for the storage and lifting of water is being constructed in the part of Telangana State of India. For better rock mass characterization and support design, 3D engineering geological mapping was carried for the heading portion of the surge pool. 3D geologic mapping of heading portion is very important for large undergr...

Preconstruction stage geological and geotechnical investigations were carried out for the underground pump house complex of Pranahitha Chevella Sujala Sravanthi Lift Irrigation Scheme (PCSSLIS) package-12. The proposed pump house complex envisages important structures such underground surge pool, transformer cavern, pump house, draft tubes, deliver...

402.50 m long, 59.50 m high and 26.00 m wide underground pump house cavern for a lift irrigation scheme is being constructed in the part of Telangana State of India. For better rock mass characterization and support design, 3D engineering geological mapping was carried for the heading portion of the pump house. 3D geologic mapping of heading portio...

During last five decades many attempts have been made to develop a means of assessing the excavatability of rock. These classifications have been used to select appropriate excavation systems and equipment used in civil and mining works. Empirical rating and seismic velocity systems are proposed for the rippability of a rock mass. In this paper roc...

Engineering geological investigations of cut slopes of important structures are essential during construction of a project to provide data input for support design and it also forms valuable documentation for post-construction instrumentations. For important structures like tail race pool and tail race channel of hydroelectric projects, the cut slo...

Geotechnical assessment of the foundation including engineering geological investigations are essential for important civil structures to provide permanent data set for geological interpretations and for recommendations of suitable engineering measures for the improvement of the foundation. Yaragol Gravity Dam for drinking water is being constructe...

Geotechnical assessment of the foundation including engineering geological investigations are essential for important civil structures to provide permanent data set for geological interpretations and for recommendations of suitable engineering measures for the improvement of the foundation. Yaragol Gravity Dam for drinking water is being constructe...

Aim: Geotechnical assessment of the foundation including engineering geological investigations are essential for important civil structures to provide permanent data set for geological interpretations and for recommendations of suitable engineering measures for the improvement of the foundation. Yaragol Gravity Dam for drinking water is being const...

For the deep underground pump house complex engineering geological and geotechnical investigations were carried out. The area was investigated through detailed engineering geological mapping, exploratory drilling, in-situ stress measurements and laboratory testing. Surface mapping was done on 1:500 scales with 0.5 m contour interval and drill holes...

Engineering geological investigations were carried out for a 158.65 m long and 8.0 m diameter escape tunnel of Kaleshwaram Lift Irrigation Scheme Package-6 in Telangana State. For this project a deep underground pump house and transformer caverns were excavated, and to approach these structures, the escape tunnel was constructed. Tunneling was done...

Engineering geological investigations were carried out for 14.5 m finished diameter semi-circular shaped twin tunnels, which are constructed for up-and-down traffic at Hospet of Hungund-Hospet section of NH-13, Karnataka. The tunnels are passing through the hill underneath the operating railway track. The clear vertical distance from the crown of t...

For better rock mass characterization and support design, 3D engineering geological mapping was carried for the heading portion of the under construction 200.00 m long, 68.75 m high and 20.20 m wide underground additional surge pool cavern of a Pranahitha-Chevella Sujala Sravanthi lift irrigation scheme package 8, India. To study cavern behavior, 3...

Engineering geological foundation investigations are essential for important civil structures to provide permanent data set for geological interpretations. At Rawatbhata, India, two units of 700 MW each Pressurized Heavy Water Reactor (PHWR) type Nuclear Reactors are being constructed adjacent to existing Rajasthan Atomic Power Project (RAPP) units...

This paper highlights the slope stability analysis of a limestone mine in Tamilnadu state, India. A critical evaluation of the slope has been carried out with the present pit limit of 60 m to a maximum of 108 m. A dump yard on the footwall side mine boundary limit on the hangwall side and national road way on either side, restrict the deepening of...

Engineering geological mapping on 1:200 scale of surge-pool-excavated-vertical walls of Mahatma Gandhi Kalwakurthi Lift Irrigation Scheme-II (MGKLIS-II) was carried out which is being constructed for the irrigation of drought prone upland areas of Mahaboobnagar District in Telangana State, India. For rock mass characterization and for geologic inte...

Geotechnical evaluation of the foundation is essential for important structures to provide permanent data set for geological/geotechnical interpretations. In order to evaluate the design basis foundation parameters of tower foundation and pond floor of under construction Natural Draught Cooling Tower-8B of Nuclear Building-8 of Rajasthan Atomic Pow...

Foundation floor mapping is essential for important structures to provide permanent data set for geological interpretations. At Rawatbhata, Rajasthan, two units of 700 MW each Pressurized Heavy Water Reactor (PHWR) type Nuclear Reactors are being constructed adjacent to existing Rajasthan Atomic Power Project (RAPP) units 1 to 6. In order to evalua...

The competency of any TBM in any geological condition is determined by a rock or rock mass breakage process. A 12.24 km long tunnel between Maroshi and Ruparel College was excavated by Brihanmumbai municipal corporation (BMC) to improve water supply system of greater Mumbai, India, using open-type hard rock tunnel boring machines (TBMs). In this pa...

A 12.24 km long, 3.60 meter diameter water tunnel from Maroshi to Ruparel College in Mumbai, achieved a breakthrough in February, 2012. It marks the completion of the tunnel excavation and boring phase of one of the Mumbai's longest and biggest underground water tunnels excluding about 37 km TBM tunneling for Mumbai water supply projects. The entir...

With widespread increasing applications of mechanized tunneling in almost all ground conditions, prediction of tunnel boring machine (TBM) performance is required for time planning, cost control and choice of excavation method in order to make tunneling economical. Penetration rate is a principal measure of full-face TBM performance and is used to...

Hard rock Tunnel Boring Machines (TBMs) have been used in various ground conditions. There has been a lot of research on development of models to allow accurate prediction of TBM penetration rate in given ground conditions. These models, although successful in prediction of machine performance in many cases, are short of accounting for some of the...

SOCIETAL RELEVANCE Geological mapping of cut slopes of important structures is essential to provide data input for geological interpretations during construction. It also forms valuable documentation for post-construction stage. For important structures like tail race pool and tail race channel of hydro electric projects, the supporting cut slope s...

A 12.24 km long, 3.60 meter diameter water tunnel from Maroshi to Ruparel College in Mumbai, achieved a breakthrough in February, 2012. It marks the completion of the tunnel excavation and boring phase of one of the Mumbai's longest and biggest underground water tunnels excluding about 37 km TBM tunneling for Mumbai water supply projects. The entir...

Foundation floor mapping is essential for important structures to provide permanent data set for geological interpretations. For very important structures like tail race pool and tail race channel, the supporting foundation strata have to be well studied and documented to provide data set for credible geologic interpretations. In order to evaluate...

A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by TBM. This tunnel is divided into three sections i.e. Maroshi–Vakola (5.83 km), Vakola–Mahim (4.55 km) and Mahim–Ruparel College (1.86 km). This study pertains to the Maroshi–Vakola tunnel section. In this study, an attempt has been made to establish the relationship be...

Geological mapping of important structures is essential to provide data input for geological interpretations during construction and also it forms valuable documentation for post-construction stage. For important structures like deep surge pool of lift irrigation, the supporting wall and foundation strata have to be well studied and documented for...

A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by tunnel boring machine (TBM) to improve the water supply system of Greater Mumbai, India. In this paper, attempt has been made to establish the relationship between various litho-units of Deccan traps, stability of tunnel and TBM performances during the construction of...

tA 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by tunnel boring machine(TBM) to improve the water supply system of Greater Mumbai, India. In this paper, attempt has beenmade to establish the relationship between various litho-units of Deccan traps, stability of tunnel andTBM performances during the construction of 5....

A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by Tunnel Boring Machine (TBM) to improve the water supply system of Greater Mumbai.The tunnel is exacavated through four shafts located at Maroshi, Vakola, Mahim and Ruparel College. The rock types encountered during the excavation of shafts and tunnel are fine compact b...

The underground water conductor system for the proposed Malshej Ghat Pumped Storage Scheme Project comprises intake for turbine operation, headrace tunnel, pressure shaft and tailrace tunnel. The components of water conductor system were investigated through detailed engineering geological mapping, geophysical survey, exploratory drilling and labor...