DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

FIELD SURVEY OF SELF-HEALING OF CRACKS IN THE IMPERVIOUS ELEMENT OF BORED CLAY-CEMENT CONCRETE PILES

Вестник МГСУ 3/2018 Том 13
  • Kotlov Oleg Nikolaevich - Head of the Department of the Foundations, Earth and Underground Structures, AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG) Candidate of Geological-Mineralogical Sciences, Head of the Department of the Foundations, Earth and Underground Structures, AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG), 21 Gzhatskaya st., St. Petersburg, 195220, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Orischuk Roman Nikolaevich - AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG) Chief Executive, AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG), 21 Gzhatskaya st., St. Petersburg, 195220, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Gunyashova Faina Ivanovna - - Laboratory of the Engineering Geology, AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG) Leading Engineer, Laboratory of the Engineering Geology, AO “The B.E. Vedeneev All Russia Institute of Hydraulic Engineering” (B.E. Vedeneev VNIIG), 21 Gzhatskaya st., St. Petersburg, 195220, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 322-329

The article contains a description of the methodology and the results of field experiments on self-healing in the impervious element of bored piles filled with clay-cement concrete at the site of temporary shoring of excavation pit of the main structures of Nizhne-Bureyskaya HPP. The results of the experiments allowed us to determine the suitability of local sand from the quarry №5 for self-healing of cracks. Recommendations for quality control of the sandy soil, placed into the transition zones of the dam, were developed. Subject: field studies of colmatization of through cracks in clay-cement concrete diaphragm of earth dams at the site of temporary shoring of excavation pit of the main structures of Nizhne-Bureyskaya HPP. Research objectives: determine possibility of application of the sand material, existing in local quarries, as a contact layer that provides self-healing of cracks in case of their creation in the body of the clay-cement concrete diaphragm of the earth dam of Nizhne-Bureyskaya HPP in the process of its operation. Materials and methods: field experiments were conducted on a transverse shoring of the excavation pit of the main structures of Nizhne-Bureyskaya HPP. Conducted experiments consisted in self-healing of artificial cracks by sandy material arranged in clay-cement concrete piles of temporary shoring, for which a cylindrical cavity for accumulation of sandy material was created in the body of the pile by drilling. At the bottom of the pile from the pit, artificial holes were created for self-healing. Results: it was experimentally confirmed that when using sand from the quarry № 5, the through cracks in the diaphragm of the dam of Nizhne-Bureyskaya HPP will be completely colmatized by the soil of the healing layer located in front of the top face of the diaphragm. The sand from the quarry № 5 can be used as a material of the contact layer that provides self-healing of cracks in clay-cement concrete diaphragm of the earth dam, and when it is used, it is necessary to control the recommended granulometric composition of sand and ensure absence of lumps of clayish soils. Conclusions: in the field conditions, we obtained the values of hydraulic gradients at which takes place the self-healing of cracks in clay-cement concrete diaphragm of the earth dam. The requirements to granulometric composition of the contact layer in the structure of the earth dam were clarified. Recommendations were developed for quality control of soil when laying the contact layer of the earth dam.

DOI: 10.22227/1997-0935.2018.3.322-329

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Safety assessment of a bored pile diaphragm in a medium-height dam

Вестник МГСУ 1/2014
  • Sainov Mikhail Petrovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Hydraulic Engineering, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Kotov Filipp Viktorovich - Moscow State University of Civil Engineering (MGSU) assistant, Department of Hydraulic Engineering, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 153-163

The article deals with the analysis of embankment dams of a new type: a rockfill dam with a clay-cement concrete diaphragm built by bored-pile method. The authors give the results of numerical modeling of a stress-strain state of 69 m high dam, where a diaphragm in the form of a slurry trench cutoff wall cuts the whole dam body and a23 m deep gravel-pebble foundation. The co-authors describe a dam design where the diaphragm is constructed in three lifts. The diaphragm lifts are connected by slabs made of clay-cement concrete or clay. Numerical modeling was carried out with the use of the author’s computer program with consideration of non-linearity of soils deformation. Analyses showed that clay-cement concrete of a slurry trench cutoff wall is in a favorable stress state, as clay-cement concrete by its deformation characteristics (E = 100 МPа) is close to gravel-pebble soil. The diaphragm deflections turned to be small; therefore, tensile stresses will not occur in it. In the diaphragm the clay-cement concrete is in a state of triaxial compression, therefore, its strength will be higher than unconfined compression strength (1-2 МPа). It may be expected that its strength will be provided. The nodes of connection of the slurry trench cutoff wall lifts also demonstrate safe operation.

DOI: 10.22227/1997-0935.2014.1.153-163

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USE OF INTEGRATED TECHNOLOGY OF FOUNDATION INSTALLATION ON COLLAPSIBLE SOILS IN CONSTRUCTION OF HIGH-RISE BUILDING IN ROSTOV-ON-DON

Вестник МГСУ 5/2018 Том 13
  • Steshenko Dmitriy Mihaylovich - North Caucasus Federal University (NCFU) Candidate of Technical Sciences, Associate Professor, Director of the International Geotechnical Center, North Caucasus Federal University (NCFU), 1 Pushkina str., Stavropol,, 355009, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Kozubal Janusz Witalis - Wroclaw University of Technology Doctor-Engineer, Associate Professor, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Golovan’ Roman Nikolaevich - OOO «DON Gidrospetsfundamentstroy» Engineer, OOO «DON Gidrospetsfundamentstroy», 65V Kozlova str., Rostov-na-Donu, 344018, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Abduraimova AbduraimovaMariya Abdurashidovna - North Caucasus Federal University (NCFU) Engineer, International Geotechnical Center, North Caucasus Federal University (NCFU), 1 Pushkina str., Stavropol, 355009, Russian Federation 355004; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Zelenko Aleksandr Aleksandrovich - North Caucasus Federal University (NCFU) Post Graduate, Department of Construction, North Caucasus Federal University (NCFU), 1 Pushkina str., Stavropol, 355009, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Reveguk Andrey Alekseevich - North Caucasus Federal University (NCFU) Post Graduate, Department of Construction, North Caucasus Federal University (NCFU), 1 Pushkina str., Stavropol, 355009, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 587-598

Subject: at the present time, the active interaction of various elements of combined piled-raft foundation (CPRF), erected in the conditions of distribution of collapsible soils, has not been sufficiently studied. The subject of the study is technological parameters and design schemes of the combined piled-raft foundation installation. We evaluate the effect of soil compaction of the foundation with ground piles on the formation of stress-strain state of the system (slab-pile-ground base). Research objectives: to reduce the cost and timing of construction of foundations, develop effective design techniques, an assessment was made of the implementation of integrated CPRF technology in the construction of a high-rise building in the conditions of distribution of collapsible soils. Materials and methods: field and laboratory data for determination of physical and mechanical properties of ground soils (humidity, specific and volume weight, humidity at the borderline of rolling and fluidity), grain (granulometric) and micro aggregate composition, swelling and shrinkage characteristics, strength and deformability characteristics (single-plane section, consolidated drained tests), characteristics of subsidence, filtration coefficient; soil testing with static indentation and pull-out loads; computer simulation of stress-strain state of the foundation with the software package Plaxis 2D. Results: field and laboratory experiments resulted in the implementation of integrated technology of construction of the piled-raft foundation on collapsible soil in the conditions of dense urban development. Conclusions: the proposed design method of the piled-raft foundation has allowed us to improve construction properties of soil, considerably increase the pile bearing capacity, reduce depth of piling and effectively include the ground-soil of a longitudinal part of the foundation into work. This method gives considerable economic effect and reduces the construction duration.

DOI: 10.22227/1997-0935.2018.5.587-598

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