Influence of frost weathering on the recession of surfaces of technogenic landforms in Yakutia

作者：Andrey E.Melnikov,Nikolay N.Grib

摘要：The article assesses the influence of permafrost weathering on the rate of destruction of technogenic land forms,as exhibit ed on as illustrated by the railway embankment of the Amur Yakut mainline in the Sakha Republic(Yakutia).Studies were carried out on a railway section more than 375 km long.The subsidence rate of the embankment slopes and structur al excavations was determined using laboratory methods that simulate various mechanisms of temperature(with a transi tion through 0℃)impact on rocks.For the first time,a quantitative assessment of the influence of cryogenic weathering on the stability of the railway in the region belonging to the northern building climatic zone is given.For the territory un der consideration,embankment rocks were experimentally determined to undergo more than 100 freezing and thawing cy cles during a year.Under the existing climatic conditions,cryogenic weathering actively affects the embankment of the railway to a depth of 30 cm.Most of the embankment deformations detected during field observations are due to defects in the integrity of this particular layer.The size of the disintegrating layer of particular types of rock comprising the rail way embankment has been established as reaching 10 cm per year.In 5 years following the formation of embankments comprising the upper structure of the railroad tracks,the physical and mechanical properties of rocks,which initially had a tensile strength for uniaxial compression in the range of 40 70 MPa,were reduced by more than 50%.According to the authors,the establishment of regional cryohypergenesis features is universal in nature and can be applied to solving a wide range of tasks related to the assessment and prediction of the degree of cryogenic transformation of rocks having different structural properties.

发文机构：Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Sciences Technical Institute（branch）of M.K.Ammosov North-eastern Federal University

关键词：cryogenicWEATHERINGEMBANKMENTrailwaySUBSIDENCErateRepublicofSakhaYAKUTIA

分类号： P[天文地球]