The article reports results of laboratory tests of weak water-saturated soils (remoted from day surface) in stress-strain state under influence of compression with double-sided filtration of pore’s water. The authors suggested the upgraded assembly scheme of the soil pressure sensors (load cells). The laboratory research of the water-saturated macro peat sample was made in compression conditions with “ground lock” and modeling of the experiment with Plaxis 2D software system. The unit deformation-pressure graph and excessive pore pressure against time in different steps of load graph were built and based on this findings. Authors made the new experimental device for research of the water saturated peat mechanics properties with excessive pore pressure

The article describes results of laboratory tests of weak water-saturated soils (remote from day surface) in stress-strain state under influence of compression with double-sided filtration of pore's water. The experimental device with console-lever system of load transfer and potential of double-sided filtration was made for current research. The compression specification was controlled with the strain gauge sensor element of general pressure (i.e. the load cell).The deformation in sample were measured with the motion detecting transducer that based on indicating gage. The excessive pore pressure was measured with strain gauge sensor elements and digital manometer. Also the plots of compression deformation against pressure and changes of excessive pore pressure during the time on different load degrees were drawn. Although, authors made the new experimental device for research of the water saturated peat mechanics properties with excessive pore pressure.

In the article, the authors consider the problem of building buildings and structures on permafrost soils, provides a brief overview of ways to preserve the frozen state of base soils. The analysis of scientific works devoted to the thermal interaction of an engineering structure with permafrost soils is given. Conducting full-scale experiments in the conditions of the spread of permafrost soils is a laborious and expensive undertaking, therefore, as part of the research, an experimental stand was developed that allows one to study the processes of freezing and thawing soils in laboratory conditions. The experimental stand is a soil tray with rigid walls and a bottom with overall dimensions in the plan of 1000x1000 mm and a height of 1000 mm. The open system was modeled by placing perforated pipes at the bottom of the tray with a heating cable installed inside the pipes, maintaining a positive water temperature. To ensure one-sided and plane-parallel freezing, the side surfaces and the bottom of the tray were glued with a heater. To fix the temperature of the soil in the experimental bench and the air temperature in the freezer, the TEREM 4-1 measuring complex with DTS 1-1 soil temperature sensors is used. To fix the movements of the soil base in the experimental bench, ICH-50 dial indicators with a division price of 0.01 mm on a telescopic magnetic stand are used. To study the processes of freezing thawing of soils, the authors propose a series of experimental studies on water-saturated loams in laboratory conditions. A description is given of an experimental bench with a model of a thermostabilizer for studying the processes of freezing-thawing of base soils in laboratory conditions, and a methodology for conducting experimental studies is described.

Abstract. The perspective development of Yamal-Nenets Autonomous District, which is rich in mineral resources is impossible without creation of the road network for communication between settlements, oil and gas fields and transport hubs. Yamal-Nenets Autonomous District is characterized by complex engineering-geological conditions where different geological and geocryological phenomena and processes are being developed causing specific approaches to design and construction of engineering structures to be used. In this regard, an urgent task is to develop constructional solutions making it possible to stabilize the road lower structure and the roadbed, prolong periods between repairs on individual sections and improve operational reliability of roads in general. The paper describes the proposed and implemented constructional and technological solutions to stabilize the road lower structure and the roadbed constructed on permafrost soils. The results of two-year geotechnical monitoring of the road sections with implemented solutions are given.

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