Blog

Standardizing Subsurface Utility Engineering (Detection & Mapping of Existing Utilities)

Standardizing Subsurface Utility Engineering (Detection & Mapping of Existing Utilities) Dr. Sanjay Rana, Director, PARSAN Overseas Pvt. Ltd. New Delhi, India, sanjay@parsan.biz   Abstract Various utility installation projects involve execution using a mix of cable laying technologies like HDD (Horizontal Directional Drilling), MT (Micro-Trenching) and open trenching. Infrastructure projects also require accurate information on underground utilities in planning and construction stages. To be able to avoid damages to existing utilities, especially in Indian cities with extreme subsurface utilities congestion, record creation of existing subsurface utilities is the first step. Well ...

Read More

Geo-electrical Real-time Ground Prediction While TBM-Boring

Geo-electrical Real-time Ground Prediction While TBM-Boring Dr. Sanjay Rana, Director, PARSAN sanjay@parsan.biz     Abstract The Bore Tunnelling Electrical Ahead Monitoring (BEAM) system, developed by the GET Company, Germany, is a geophysical ground prediction technique especially designed for TBM operations. BEAM is a non-intrusive focused-electrical induced polarization ground prediction technique, permanently operating while TBM advances. The intent is to get a continuous real-time geological forecast ahead of TBMs, useful to predict the quality of the groundmass and the presence of large quantities of water. The system has proven to be very reliable in providing an accurate...

Read More

Geophysical Investigations To Deal With Uncertainties in Difficult Ground Conditions

GEOPHYSICAL INVESTIGATIONS TO DEAL WITH UNCERTAINTIES IN DIFFICULT GROUND CONDITIONS Dr. Sanjay Rana Director, PARSAN Overseas Pvt. Ltd., New Delhi, India   Abstract   For planning and development of any major civil project adequate knowledge of geotechnical conditions at site is important. If not adequately investigated, geological 'surprises' can lead to failures and accidents during execution. Engineering geophysics is an efficient means of subsurface investigation. The continuous information provided by geophysical methods, as against discrete point information provided by conventional means like drilling, makes project execution safer & faster. Technological advancements an...

Read More

Advancement in Geophysical Investigations for Tunnels

Advancement in Geophysical Investigations for Tunnels Dr. Sanjay Rana, Director, PARSAN Overseas (P) Limited, India sanjay@parsan.biz   ABSTRACT: Modern major construction is inconceivable without high-level engineering explorations, which play a major role in increasing the economic efficiency of capital investments. For the design of structures it is indispensable to procure comprehensive high-quality information about the subsurface, within very short periods. The study of diverse natural conditions predetermines a variety of methods and technical means which can be used for carrying out exploratory work. Most of the time, while working on tunnels, caverns and oth...

Read More

NON-DESTRUCTIVE TECHNIQUES FOR INSPECTING DAMS (CONCRETE, MASONRY, EARTHEN) AND SPILLWAYS

NON-DESTRUCTIVE TECHNIQUES FOR INSPECTING DAMS (CONCRETE, MASONRY, EARTHEN) AND SPILLWAYSDR. SANJAY RANADirector, PARSAN Overseas Pvt. Ltd., New Delhisanjay@parsan.biz  1.  Introduction   As large dams age, it becomes increasingly important to determine the condition of their material and to track changes in this condition over time. Inspections of concrete, masonry and earthen dams, dikes and spillways often require testing to evaluate for leakage paths, soil settlement/voiding, or weakened deteriorated concrete/ masonry.  NDT uses geophysical testing methods (ground penetrating radar, 2D/ 3D electrical resistivity imaging, streaming potential) to identify potential leakage paths under earthen dams, dik...

Read More

Ground Penetrating Radar (Under Water) for Condition Assessment of Stilling Basins

Ground Penetrating Radar (Under Water) for Condition Assessment of Stilling BasinsDr. Sanjay RanaIntroduction to Ground Penetrating RadarGround Penetration Radar (GPR) has become an advanced and easy to use tool for subsurface investigations in recent past. It uses electromagnetic energy (in MHz region) to detect subsurface objects such as pipes, building foundations, land mines, archaeological artifacts like pottery, etc. Most common GPR assemblies typically consist of transducer unit, control and display unit and survey cart (Fig.1). The transducer unit comprises of two or more antennas transmitter and receiver. This unit may either be close to the ground surface (ground coupled antenna, Fig.2) or some dis...

Read More

Detection of Clandestine Tunnels using Geophysical Techniques

Detection of Clandestine Tunnels using Geophysical TechniquesDr. Sanjay Rana, Director, PARSANsanjay@parsan.bizINTRODUCTIONForensic geophysics is a branch of forensic science and is the study, the search, the localization and the mapping of buried objects or elements beneath the soil or the water, using geophysics tools for legal purposes. There are various geophysical techniques for forensic investigations in which the targets are buried and have different dimensions (from weapons or metallic barrels to human burials and bunkers). Geophysical methods have the potential to aid the search and the recovery of these targets because they can non-destructively and rapidly investigate large areas where a suspect, ill...

Read More

Best Geophysical Investigation Techniques for Bridges - Parsan

Geophysical Investigation Techniques for Bridges    Dr. Sanjay Rana, Director, PARSAN Overseas Pvt. Ltdsanjay@parsan.biz INTRODUCTION Modern major construction is inconceivable without high-level engineering explorations, which play a major role in increasing the economic efficiency of capital investments. For the design of structures it is indispensable to procure comprehensive high-quality information about the subsurface, within very short periods. The study of diverse natural conditions predetermines a variety of methods and technical means which can be used for carrying out exploratory work.The geological aspects of the civil engineering site, surface and subsurface, have to be studied in details befor...

Read More

Geophysical Investigation for Forensic Applications

Geophysical Investigation for Forensic ApplicationsDr. Sanjay Rana, Director, PARSANsanjay@parsan.bizINTRODUCTIONForensic geophysics is a branch of forensic science and is the study, the search, the localization and the mapping of buried objects or elements beneath the soil or the water, using geophysics tools for legal purposes. There are various geophysical techniques for forensic investigations in which the targets are buried and have different dimensions (from weapons or metallic barrels to human burials and bunkers). Geophysical methods have the potential to aid the search and the recovery of these targets because they can non-destructively and rapidly investigate large areas where a suspect, illegal buria...

Read More

Integrated Geophysical Approach for Mining Applications

Integrated Geophysical Approach for Mining ApplicationsDr SANJAY RANA,Director, PARSAN Overseas Private Limited, New Delhi, INDIA(e-mail of corresponding author: sanjay@parsan.biz)ABSTRACT:Geophysical methods have great potential to solve various mining related problems. Due to their non-destructive nature and quick application, using these methods results in huge savings in terms of time and money. Newer deposits are deeper and exploring those using conventional means of drilling is becoming increasing expensive and time consuming. Geophysical methods are also being routinely used as a reconnaissance tool to quickly determine potential of a new site before getting into lease agreements. Apart from typical app...

Read More

Innovative Geophysical Methods for Pipeline Leakage Detection

Innovative Geophysical Methods for Pipeline Leakage Detection Dr. Sanjay Ranasanjay@parsan.bizAbstract: Pipeline networks are the most economic and safest systems of transport for water, sewage, mineral oil, gases and other fluid products. As a means of long-distance transport, pipelines have to fulfill high demands of safety, reliability and efficiency. Most pipelines, regardless of what they transport, are designed with a typical life span of 25 years. When they do begin to fail, they do so slowly beginning with leaks at poor construction joints, corrosion points and small structural material cracks, and gradually progress to a catastrophic ending. But there are also other reasons for leak disasters such as...

Read More