Abstract:

Ordinary electrical method is inefficient in the measurement of retaining wall, while high-density electrical method has better efficiency as it is based on the electrical prop of different underground geological bodies according to the distribution regularity of conduction current of strata. Therefore it was used in the measurement of retaining wall at the left bank of mainstream Nanshilichanggou River, and the result showed that, the height of the wall is about 2.3m, the depth of potential water level in the earth behind the wall is about 3.1-3.8m, cavities in the retaining wall and the earth are found in partial positions but are not developed in general, the thickness of the wall does not change a lot. The result is consistent with those from geological radar and practical excavation, indicating that high-density electrical method is feasible to measure retaining wall.

Key words: high-density electrical method, electrical resistivity, retaining wall, potential water level, cavity