Труды российских конференций

Most of engineering geological as well geotechnical studies assumed, that glacigenic soils are relatively homonogenous with limited variations of properties within particular layers and sections. Taking on account great number variations of glacigenic till facies and subfacies for traditional studies geological sections are simplified to multilayer environment.

Experimental in situ more than 10 000 measurements was performed to determine measurement precision and the impacting factors of manual penetrometer’s cone resistance (q_c, MPa) and the moisture meter’s measured natural volumetric moisture (W, vol. %), both in glacigenous soil and the soil of other genesis, including Quaternary and Devonian clayey and sandy soils. There were a number of aerial studies of glacial soil properties, including in decimetre scale. For that massif lodgement till section without any visible layering and foliation, no grain size changes of soil according laboratory tests.

Test area were design to single cube form with edge dimensions of one meter and subdivided in a cells of 0.1m and corresponding q_c and W tests were performed in three dimensions. Data statistical processing demonstrates slight value fluctuations on single side or dimension. However, data visualization in 3D demonstrates strong anisotropy of q_c and W values (Fig.1.). Latter this was certified in number of other sections as well. Therefore it is concluded, that invisible geological structures and heterogeneity of geotechnical properties can be recognised as significant impacting factor on stability of soil massifs, including natural and manmade landscape exposed slopes.

Figure 1. Spatial distribution of measured a) natural water content (W, vol.%), and b) cone resistance values (q_c, MPa) on cube faces of measurements made athwart each face. Value of one section on axes 0.1 m.