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 Republ...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.展开更多
Frost heaving processes have been a focus of study since the late 19th century.Factors controlling frost heave development were investigated over several decades.The mechanisms involved were identified based on numero...Frost heaving processes have been a focus of study since the late 19th century.Factors controlling frost heave development were investigated over several decades.The mechanisms involved were identified based on numerous field and experimental evidences. However,despite this long history of frost展开更多
The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.S...The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.Seismic intensity,schemes of zoning by factors of engineering geological conditions,and the general scheme of engineering geological zoning of the Sakha（Yakutia） Republic or the SR（Y）,are shown on the inset maps.The map is required to provide information for planning,construction and exploitation of engineering structures in the SR（Y）.A distinguishing feature of the map is the indication of almost blanket distribution of the frozen ground class.Types of the frozen ground class are separated by lithology,while ground varieties are separated by temperature.Fresh and ultra-fresh suprapermafrost water is predominant within the territory.The compiled map indicates parts of the Arctic-Asian and Baikalo-Stanovoi planetary seismic belts that make engineering geological conditions more complicated.展开更多
The data on chemical compounds of three Rododendron species （Rh. adamsii Rehd., Rh. aureum Georgi. and Rh. lapponicum subsp, parvifolium （Adams） T. Yamaz.） from the mountain of Evota top in South Yakutia are shown...The data on chemical compounds of three Rododendron species （Rh. adamsii Rehd., Rh. aureum Georgi. and Rh. lapponicum subsp, parvifolium （Adams） T. Yamaz.） from the mountain of Evota top in South Yakutia are shown. Extracts of these plants was analyzed by method of planar chromatography in thin layers using different specific detectors to exposure of some groups of biologically active matters. During the researches, it was established that polyphenol compounds of different degree of condensment prevail in rhododendron composition; catechines, flavonoids, coumarins, saponins, essential oils, phenol carboxylic acids and arbutin are present too. Due to detected features, all the researched species of rhododendrons are perspective for practical using in food industry and as adaptogenes for maintenance of people health in the conditions of north.展开更多
文摘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.
文摘Frost heaving processes have been a focus of study since the late 19th century.Factors controlling frost heave development were investigated over several decades.The mechanisms involved were identified based on numerous field and experimental evidences. However,despite this long history of frost
文摘The Engineering Geological Map of the Sakha（Yakutia） Republic covers about 3 million kilometers which is one-fifth of the territory of Russia.The map displays ground and geocryological conditions and active faults.Seismic intensity,schemes of zoning by factors of engineering geological conditions,and the general scheme of engineering geological zoning of the Sakha（Yakutia） Republic or the SR（Y）,are shown on the inset maps.The map is required to provide information for planning,construction and exploitation of engineering structures in the SR（Y）.A distinguishing feature of the map is the indication of almost blanket distribution of the frozen ground class.Types of the frozen ground class are separated by lithology,while ground varieties are separated by temperature.Fresh and ultra-fresh suprapermafrost water is predominant within the territory.The compiled map indicates parts of the Arctic-Asian and Baikalo-Stanovoi planetary seismic belts that make engineering geological conditions more complicated.
文摘The data on chemical compounds of three Rododendron species （Rh. adamsii Rehd., Rh. aureum Georgi. and Rh. lapponicum subsp, parvifolium （Adams） T. Yamaz.） from the mountain of Evota top in South Yakutia are shown. Extracts of these plants was analyzed by method of planar chromatography in thin layers using different specific detectors to exposure of some groups of biologically active matters. During the researches, it was established that polyphenol compounds of different degree of condensment prevail in rhododendron composition; catechines, flavonoids, coumarins, saponins, essential oils, phenol carboxylic acids and arbutin are present too. Due to detected features, all the researched species of rhododendrons are perspective for practical using in food industry and as adaptogenes for maintenance of people health in the conditions of north.
