title: Bearing capacity of bored piles by lateral surface in the conditions of distribution permafrost saline soils
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
Creators: name: Ð¤Ð¸Ð»Ð¸Ð¼Ð¾Ð½Ð¾Ð², ÐÐ²Ð°Ð½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: Ð¡Ð²Ð°Ð¸
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description: The topic of graduate qualifying work of master: "Bearing capacity of bored piles by lateral surface in the conditions of distributionpermafrost saline soils." The work is devoted for improving existing methodology of evaluation of bearing capacity of bored piles in permafrost soils of the Arctic zone. In the master's thesis were also considered and selected mortars compositions used for bored piles.
6The research set the following goals:1.To analyze literary sources and evaluate the existing methodology of calculation of bored pilesbearing capacity in permafrost conditions.2.To conduct a selection of the compositionsof cement-sand mortars, using modifying additives, applied for filling hollows of bored piles in frozen, salt soils.3.Perform tests to determine the forces of freezing at the contact "pile-cement-sand mortar"4.To carry out calculations of the bearing capacity of bored piles in the conditions of saline permafrost soils using obtained results.5.To give practical recommendations for design bored piles in permafrost, saline soils.Studies on testing of shear resistance along the contact surfaces of freezing âpile-cement-sand mortarâ were carried out in an accredited laboratory (LLC âCGEIâ, St. Petersburg, Russia) during the period from 2019 to 2020 year. Tests were conducted on shear devices of computing complex of âIVK-Mechanics-3â in accordance with the requirements of GOST 12248-2010, combining the load and measuring systems. The processing of the obtained data was carried out referringto the creep curves and relationship between shear stress and the total strain at the time of data stabilization. The development of perspective cement-sand mortar composition used in the technology of bored piles was selected in a concrete laboratory on the basis of "MC-Bauchemie (Leningrad Region, Kirovsk). The experiments were conducted in accordance with proven methods using certified equipment. In the concrete laboratory, new compositions of cement-sand mortar were selected using superplasticizing, frost-resistant and stabilizing additives. These compositions satisfy to the basic requirements for mortars used for filling hollows of bored piles in the Far North conditions. Based on the results of tests for determination of the freezing forces on the contact plane âcement-sand mortar-pileâ, new data were obtained for calculationbearing capacity of piles in permafrost, saline soils.