Abstract
Studies of loess subsidence soils under conditions of their long-term soaking and water filtration were performed. A set of predictive factors characterizing the composition and properties of loess soil responsible for its long-term deformation during soaking is revealed. A method of predicting the value of post-shrinkage compaction based on probabilistic analogies using the Bayes formula is proposed.
Highlights
Slow-subsidence soils include loess-like and loess-like medium and heavy loam, the dispersed component of which is represented mainly by montmorillonite [1]
The main problem of the control of subsidence on these soils follows from the fact that the current regulations (SP 22.13330.2016, GOST 23161-2012 [4,5]) provide for the determination of subsidence indicators: the value of the relative subsidence of the εsl and the initial subsidence pressure of the Psl in compression devices by short-term soaking of soil samples in conditions of their capillary water saturation
The results shown in table 2 show that the value of postseeding compaction depends on most indicators and primarily on the content of gypsum in loess soil, aggregation of the dispersed fraction and density of dry soil
Summary
Slow-subsidence soils include loess-like and loess-like medium and heavy loam, the dispersed component of which is represented mainly by montmorillonite [1]. The main problem of the control of subsidence on these soils follows from the fact that the current regulations (SP 22.13330.2016, GOST 23161-2012 [4,5]) provide for the determination of subsidence indicators: the value of the relative subsidence of the εsl and the initial subsidence pressure of the Psl in compression devices by short-term soaking of soil samples in conditions of their capillary water saturation. This test scheme is not fully consistent with the actual conditions of the bases and foundations, especially when flooding areas. Type of soil conditions on the subsidence of 80% of the city - I, and 20% of the territory - II. [7] The maximum drawdown of the thickness from its own weight reaches 20-25 cm (calculated according to compression tests according to the scheme of “two curves”) [8]
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