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.
Highlights
The object of research is a deep road through cut on the constructed motorway from Khabarovsk to Vladivostok (Fig. 1)
Dangerous hydrogeological manifestations arose during its construction: small fountains of underground water were fixed from the west cut slope and through not pavement covered roadbed in summer, and underground water ice covers were formed on the western slope during winter time
The objectives of the study were to identify the features of the engineering and geological conditions of the site operation and to assess its complexity, to identify the features of the geological section, to assess the areas of feeding and discharge of groundwater, to assess water flows and develop measures for dewatering
Summary
The object of research is a deep road through cut on the constructed motorway from Khabarovsk to Vladivostok (Fig. 1). There were outcrops of groundwater at the base of the cut slopes on the left and right sides (Fig. 1) These phenomena would inevitably cause engineering and geological processes threatening reliable and safe operation of the road - active erosion, shedding of slopes, deformation of the base of the pavement. In these conditions, additional to the pre-project geotechnical and hydrogeological studies that were performed before excavation investigations were needed. The research materials were obtained on the basis of complex field and analytical works, including hydrogeological and engineering geological reconnaissance routes, geophysical surveys by the VES method, assessment of water inflows by the method of water level restoration in wells, determination of the filtration coefficient, measurements of creek flow rates, formed by the spillage of groundwaters at the base of cut slopes, analytical calculations, analysis of published and stock materials
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