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The boundary fault and its implication for the Tenughat dam, Hazaribagh district, Bihar (India)
Summary The faulted contact along the boundary of the Archean, metamorphics and Lower Gondwana sedimentaries near Tenughat (23° 44°:85°50°) cuts across the alignment of the dam axis at CH. 114.00 on the left abutment. This fault is known as the “boundary fault” which tends to limit the extension of coal-bearing Gondwana rocks. It has caused considerable displacement of these formations and the rocks are severely crushed, shattered and indurated. The rocks are highly weathered down to 20 m depth and even below this depth the rocks are not competent because of erratic weathering along various shear and joint planes. The 72 m wide Damodar river bed, across which a 50 m high earth dam has been built, is not suitable for the location of its spillway, because of the presence of 15 m thick sand in the river channel. Hence the spillway of this dam was constructed on the higher reaches of the right bank entirely over metamorphic rocks where foundation grade fresh rock was available within 15 m depths. Besides, the location of the spillway here has reduced excavation depth and its height thereby helped in its economical construction. The boundary fault zone has a high permeability and a grout curtain has been provided along the central line of cut-off trench with a clay blanket towards the upstream side to check seepage of reservoir water. On conducting water percolation tests after grouting, it has been noted that the permeability of the bedrocks has been substantially reduced but certain grouted zones show erratic results. Over and above these remedial measures, a number of relief wells have been provided at the toe of the dam to intercept and release the water pressure caused by seepage through its foundation. Though this fault is seismically dead, a programme is afoot to establish seismological stations on a triangular grid pattern around the dam to record earth tremors which might originate from this fault plane.
The boundary fault and its implication for the Tenughat dam, Hazaribagh district, Bihar (India)
Summary The faulted contact along the boundary of the Archean, metamorphics and Lower Gondwana sedimentaries near Tenughat (23° 44°:85°50°) cuts across the alignment of the dam axis at CH. 114.00 on the left abutment. This fault is known as the “boundary fault” which tends to limit the extension of coal-bearing Gondwana rocks. It has caused considerable displacement of these formations and the rocks are severely crushed, shattered and indurated. The rocks are highly weathered down to 20 m depth and even below this depth the rocks are not competent because of erratic weathering along various shear and joint planes. The 72 m wide Damodar river bed, across which a 50 m high earth dam has been built, is not suitable for the location of its spillway, because of the presence of 15 m thick sand in the river channel. Hence the spillway of this dam was constructed on the higher reaches of the right bank entirely over metamorphic rocks where foundation grade fresh rock was available within 15 m depths. Besides, the location of the spillway here has reduced excavation depth and its height thereby helped in its economical construction. The boundary fault zone has a high permeability and a grout curtain has been provided along the central line of cut-off trench with a clay blanket towards the upstream side to check seepage of reservoir water. On conducting water percolation tests after grouting, it has been noted that the permeability of the bedrocks has been substantially reduced but certain grouted zones show erratic results. Over and above these remedial measures, a number of relief wells have been provided at the toe of the dam to intercept and release the water pressure caused by seepage through its foundation. Though this fault is seismically dead, a programme is afoot to establish seismological stations on a triangular grid pattern around the dam to record earth tremors which might originate from this fault plane.
The boundary fault and its implication for the Tenughat dam, Hazaribagh district, Bihar (India)
Singh, V. P. (author)
1979
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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