Hazardous hydrogeological processes in deep road trenching on the section of the Khekhtsir ridge

Abstract

During the construction of the motorway bypass of Khabarovsk on the northern outskirts of the Khekhtsir block rise, composed of strongly dislocated Mesozoic and Paleozoic rocks, on the section of the Khekhtsir ridge watershed crossing in deep road trenching of rock formations, dangerous hydrogeological manifestations, threatening the normal construction and operation of the road, were revealed. By the special tests (well drilling, geophysical studies using the VES survey method, hydrometric measurements of the groundwater discharges in excavated cuvettes and wells slug-out test), it is determined that the hydrogeological conditions of the site are very complex, as the groundwater supply area is located in the watershed part of the Khekhtsir Range that is crossed by the road. According to the specific electrical resistance test in the upper part of the massive and to the depth of the geological section low resistances blocks corresponding to the fragmented rocks and watered zone were fixed.