Tapi Irrigation Development Corporation has published Tender For Gul Medium Project - Geophysical Investigation Of Gul Dam Due To Leakages In Gorge Portion Of Gul Medium Project Tal Chopda Dist Jalgaon.. Submission Date for this Tender is 05-02-2024. Irrigation Work Tenders in Jalgaon Maharashtra. Bidders can get complete Tender details and download the document.
| Sl. No. | Item Description |
| 1 | Anjani Medium Project Tal. Erandol Dist. Jalgaon. |
| 2 | Item No.1- One line of Electrical Resistivity Imaging on Non-Overflow Portion of the dam for four profile. (each measuring 298.5m).Electrical Resistivity Imaging - The direct current resistivity method has well-established data acquisition and interpretation techniques for standard survey configurations. The method uses pairs of electrodes to inject current into the ground and measure the resulting electrical potential distribution. Its application to dam seepage investigations is two-fold. The method may be used to monitor spatial and/or temporal variations in electrical resistivity in response to changing soil conditions caused by internal erosion and anomalous seepage. The method also may be used to characterize the electrical resistivity of the subsurface for the purposes of interpreting SP data. The method can also be used to detect changes in resistivity with time, which may be linked to the development of internal erosion in the core of the embankment. The results of electrical surveys carried out on the crest of a dam are presented as vertical sections showing the electrical properties of the dam materials. Electrical currents travel along preferential pathways in the most conductive materials such as dam core composed on fine grained materials. The method provides picture of internal resistivity distribution of the dam structure, identifying areas of water saturation in the dam body, and thus identifying the zones of water accumulation and wetting.2D Resistivity Imaging uses an array of electrodes (typically 60) connected by multicore cable to provide a linear depth profile, or pseudosection, of the variation in resistivity both along the survey line and with depth. Switching of the current and potential electrode pairs is done automatically using a relay box. The computer initially keeps the spacing between the electrodes fixed and |
| 3 | Item No.2 - Streaming Potential for four profile of SP coincident with ERI profiles proposed.(each measuring 298.5m).Streaming Potential-The streaming potential method consists of measuring the electrical potential by flowing water within a structure or subsurface. Self-potential (SP) is a passive technique that measures naturally occurring electrical potentials in the ground. This is the only one of these geophysical techniques that responds directly to fluid flow. Water flowing through the pore space of soil generates electrical current flow. This electro-kinetic phenomenon is called streaming potential and gives rise to SP signals that are of primary interest in dam seepage studies. SP is measured by determining the voltage across a pair of non-polarizing electrodes using a high-impedance voltmeter. This inexpensive and deceptively simple data acquisition procedure requires special care and attention in order to reliably interpret and correct for sources of electrical --noise that can mask the signal of interest. All noise sources including time-varying telluric currents associated with solar and atmospheric activity, stray currents, and the corrosion of buried metalmust be recognized and measured. These noise sources can mask the relatively small signals associated with seepage anomalies. For this reason, telluric measurements and magnetic surveys should be carried out to assist in interpreting the SP data. Typically, SP anomalies on the order of tens of millivolts are associated with seepage anomalies of interest, although anomaly amplitudes largely depend on site-specific conditions. Interpretation of SP measurements to infer seepage patterns and concentrated seepage flows ranges from simple qualitative to more advanced quantitative numerical modeling approaches. Most common application of SP study is to identify the zones in the dam body through which seepage is taking place. The results are correlated with resistivity sections. In present case, one four profile of SP coincident with ERI profiles are proposed. |
| 4 | Item No.3 - Multichannel Analysis of Surface Waves for one profile on earthen dam. MASW for one Profile on earthen dam top - First introduced in GEOPHYSICS (1999), the multichannel analysis of surface waves (MASW) method is one of the seismic survey methods evaluating the elastic condition (stiffness) of the ground. MASW, first measures seismic surface waves generated from various types of seismic sources—such as sledge hammer analyses the propagation velocities of those surface waves, and then finally deduces shear-wave velocity (Vs) variations below the surveyed area that is most responsible for the analysed propagation velocity pattern of surface waves. Shear-wave velocity (Vs) is one of the elastic constants and closely related to Young’s modulus. Under most circumstances, Vs is a direct indicator of the ground strength. After a relatively simple procedure, final Vs information is provided in 1-D, 2-D, and 3-D formats. Seismic methods are suitable to study the strength characteristics of dyke and dams. Seismic measurements are sensitive to density changes and compactness of soils. Therefore, areas with inadequate compactness of dykes can be detected. A correlation with SPT/CPT (Standard/Cone Penetration Testing) is often done because these methods also depend on the mechanical properties of the soil. The example below shows the result of a MASW (Multichannel Analysis of Surface Waves) measurement along a dyke in comparison to two CPT readings. The MASW procedure measures the shear wave velocity of the dyke material which enables the direct access to the material shear strength. Field Data Acquisition Procedure: Field procedure for active MASW survey is explained here. The active survey is the most common type of MASW survey that can produce a 2-D Vs profile. The overall setup is illustrated in Figure hereunder. The maximum depth of investigation (Zmax) that can be achieved from the survey is usually in the 10-30 m range, but this can vary with site and type of active sources used. Surface waves are best generated over a ‘flat’ ground within at least one receiver-spread length (D). |
| 5 | Item No. 4 - Report and Data Interpretation based on the Detailed Investigation, Detailed Project Report shall be prepared as directed by the Engineer-in-Charge and as per CWC guide lines and submitted in 5 (Five) sets (all documents) and also in soft copy. |
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