Обследование оснований гидроузла на р. Матта методом электротомографии (Центральная Якутия)

Abstract

The paper presents the results of using the method of electrotomography to study the state of the base of the waterworks on the Matta River in the village of Berdigestyakh (Central Yakutia). According to geophysical work carried out in the dam downstream, it was found that the talik under the old river bed extends to the depth of more than 14 m, and along the rest of the dam, the talik is confined to the upper part of the section lying in the depth interval from 2.5 to 6.5 m. Drilling showed that the rocks in the talik are water-saturated. Temperature measurements indicate the thawed state of the dam base to the depth of more than 11 m. The specific resistance of thawed rocks varies from 20 to 70 Ohm·m for loams, from 70 to 320 Ohm·m for sand, and 300 to 1200 Ohm·m for frozen sandstones.