Engineering and geophysical surveys of areas with landslides on TS ESPO-1, 2012

In the spring of 2012, MSU-Geofizika LLC conducted preliminary field surveys of sections of the East Siberia-Pacific Ocean-1 pipeline system (VSTO-1 TS) with complex geological conditions to identify dangerous slope processes and determine the limits of their distribution.

When examining the vehicle ESPO-1 revealed several dangerous areas.

 In the surveyed areas, the processes of active erosion of the soil surface with the formation of deep ravines are widely developed.

According to the results of reconnaissance surveys, landslide bodies were identified and the optimal choice of methods for the geophysical survey of each site was made.

 Geophysical surveys of different areas were carried out using VES (vertical electrical sounding), black (frequency sounding), DOM (reflected wave method) and GPR method.

By the VES method, geoelectrical sections were constructed and slip slides were obtained.

According to seismic data (MOV), the velocities of longitudinal and transverse waves were obtained at the site of work and the boundary of loose weathered rocks and a dense, intact foundation was highlighted.

According to the data of the ChZ method, geo-electric sections were constructed on the section, which was composed of rocks, and areas with increased fracturing of rocks were identified. The strongest anomalies correspond to the clenching cracks filled with clay material. At depths of more than 5 meters, the section is composed of dense undisturbed rocks.

As a result of work on preliminary survey data and the results of geophysical work, the most dangerous areas were identified and geological work points were assigned to further study the processes developing on the territory and create geomechanical models of dangerous slopes.