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Tytuł artykułu

Role of accuracy and quantity of field tests in engineering-geotechnical researches for construction

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Języki publikacji
EN
Abstrakty
EN
The aim of this work is to summarize previously conducted studies on the optimization of the unequal geotechnical testing program and on the selection of the desired calculation indicator based on the results of such tests. The approximate, but quick and cheap tests (“express methods”) are recommended to be performed on a large scale and considered as a means of assessing the geotechnical structure of the site as a whole. It is proposed to carry out expensive “accurate” tests in a reduced volume and to use them as a means of correcting approximate tests. In the article, these issues are considered by the example of determining the bearing capacity of piles according to the data of static sounding (cone penetration testing – CPT), dynamic and static tests of full-scale piles. We propose the mathematical model for evaluating the informative content of the test complex, based on the concepts of information theory. The site is mentally divided into several sections, each of which is characterized by one of the possible values of the ultimate resistance of piles of a certain length. All variants of “placement in the plan” of possible values of pile resistances (“site images”) are considered. Initially, when nothing is known about the true value of the pile resistances in each section, all possible values of the pile resistances are assumed to be equally probable, i.e. the uncertainty of the situation is maximum. In the theory of information, such uncertainty is quantified by the value called entropy. When any test is performed at the site, the uncertainty decreases, and the more accurate the test the more significant is the decrease. The difference in entropy before and after the test represents the amount of information (in bits) that these tests carry. The calculations using this model showed that the information content of a large number of approximate tests can (due to heterogeneity of the soil) exceed the information content of small exact tests. Only one approximate test method can lead to the systematic error (overestimation or underestimation of the average value of the desired indicator). It is necessary to carry out control “exact” tests and approximate tests to eliminate such a danger. A technique is proposed for adjusting approximate estimates based on data from “accurate” tests, which ensures optimal “safety margins” in decisions being made.
Rocznik
Strony
421--434
Opis fizyczny
Bibliogr. 36 poz., rys., tab., wykr.
Twórcy
  • Federal State Budgetary Educational, Establishment of Higher Education – Bashkir State Agrarian University, Faculty of Nature Management and Construction, Department of Nature Arrangement, Building and Hydraulics 50-letia Octyabrya 34, 450001 Uf, Russian Federation
autor
  • Federal State Budgetary Educational, Establishment of Higher Education – Bashkir State Agrarian University, Faculty of Nature Management and Construction, Department of Nature Arrangement, Building and Hydraulics 50-letia Octyabrya 34, 450001 Uf, Russian Federation
  • Federal State Budgetary Educational, Establishment of Higher Education – Bashkir State Agrarian University, Faculty of Nature Management and Construction, Department of Land Management, 50-letia Octyabrya 34, 450001 Ufa, Russian Federation
  • Federal State Budgetary Educational, Establishment of Higher Education – Bashkir State Agrarian University, Faculty of Nature Management and Construction, Department of Nature Arrangement, Building and Hydraulics 50-letia Octyabrya 34, 450001 Uf, Russian Federation
  • Federal State Budgetary Educational, Establishment of Higher Education – Bashkir State Agrarian University, Faculty of Nature Management and Construction, Department of Nature Arrangement, Building and Hydraulics 50-letia Octyabrya 34, 450001 Uf, Russian Federation
Bibliografia
  • Abu-Farsakh, M.Y., Yoon, S. & Tsai, Ch. (2014). Calibration of resistance factors for CPT- -based design methods of axially load driven piles. 3rd International Symposium on Cone Penetration Testing, CPT’14. Las Vegas, Nevada.
  • Davies, T.C. (2015). Urban geology of African megacities. Journal of African Earth Sciences, 110, 188-226.
  • Djamaev, M.N. (2018). Improving the reliability of determining the bearing capacity of piles in environmental construction [abstract of a master’s thesis]. Bashkir State Agrarian University, Ufa.
  • Doc, W.E.C.C. (1990). 19-1990. Guidelines for the Expression of the Uncertainty of Measurement in Calibrations. Western European Calibration Cooperation.
  • EN 1997-1:2004. Eurocode 7. Geotechnical design. Part 1: General rules.
  • EN 1997-2:2007. Eurocode 7. Geotechnical design. Part 2: Ground investigation and testing.
  • Gmurman, B.E. (2000). Teoriya veroyatnostey i matematicheskaya statistika [Theory of probability and mathematical statistics]. Moskva: Vyshsaya shkola.
  • GOST 5686-2012. Grunty. Metody polevykh ispytaniy svayami [Soils. Field test methods by pile].
  • GOST 5686-51. Svai probnyye. Metody ispytaniy [Test piles. Test methods].
  • GOST 5686-78. Svai. Metody polevykh ispytaniy [Piles. Field test methods].
  • Hu, C., Yuan, Y., Mei, Y., Qian, W. & Ye, Z. (2018). Initial geo-stress balance method for the finite-element model using the stratumstructure method. Modern Tunnelling Technology, 55(4), 76-86.
  • ISO 22475-1:2017. Geotechnical investigations and testing. Field testing. Part 1: Static and piezo-static reconnaissance using an electrical probe.
  • ISO 22475-2:2005. Geotechnical investigations and testing. Field testing. Part 2: Dynamic probing.
  • ISO 22475-4:2005. Geotechnical investigations and testing. Field testing. Part 4: Ménard pressuremeter test.
  • ISO 2394:2015. General principles on reliability for structures.
  • Kay, J.N. (1977). Factor of safety for pilets in cohesive soils. In Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo. Vol. I. Tokyo: Japanese Society of Soil Mechanics and Foundation Engineering.
  • Khafizov, A., Khazipova, A., Kutliyarov, D., Mustafin, R., Kamaletdinova, L., Nedoseko, I. & Zubairov, R. (2019). Justification of reclamative watershed regimes of the forest-steppe zone of the western part of the Republic of Bashkortostan with regard to their provision with heat and moisture. Asian Journal of Water, Environment and Pollution, 16(2), 101-108.
  • Lu, W. & Zhang, G. (2018). Influence mechanism of vertical-horizontal combined loads on the response of a single pile in sand. Soils and Foundations, 58(5), 1228-1239.
  • Lunne, T., Powell, J.J. & Robertson, P.K. (2002). Cone penetration testing in geotechnical practice. Boca Raton: CRC Press.
  • Melnikov, N.N., Kalashnik, A.I. & Kalashnik, N.A. (2018). Integrated multi-level geofluid mechanics monitoring system for mine waterworks. Eurasian Mining, 2, 7-10.
  • Mustafin, R.F., Ryzhkov, I.B., Sultanova, R.R., Khabirov, I.K., Khasanova, L.M., Zagitova, L.R. & Rayanova, A.R. (2018). Assessment of slope stability in coastal water protection zones. Journal of Engineering and Applied Sciences, 13(S10), 8331-8337.
  • Qiu, J., Wang, X., Lai, J., Zhang, Q. & Wang, J. (2018). Response characteristics and preventions for seismic subsidence of loess in Northwest China. Natural Hazards, 92(3), 1909-1935.
  • Ryzhkov, I.B. (1995). The approach to application of static CPT together with other methods of soil investigation. In International Symposium on Cone Penetration Testing (pp. 295-300). Lincoping: Swedish Geotechnical Society.
  • Ryzhkov, I.B. & Isaev, O.N. (2016). Cone penetration testing of soils in geotechnics. Saltsjö-Duvnäs: Efron & Dotter AB.
  • Ryzhkov, I.B., Norshayan, A.V. & Khamidullin, V.A. (2016). Static sounding of soils: a brief history and current status (Anniversary issue dedicated to the 60th anniversary of the Bashkir Scientific Research Institute of Construction). Ufa: Bashkir Scientific Research Institute of Construction.
  • Shennon, K.E. (1963). Matematicheskaya teoriya kommunikatsii [The mathematical theory of communication]. Moskva: Izdatel’stvo inostrannoy literatury.
  • SNiP II-17-77. Svaynyye fundamenty [Pile foundations].
  • SP 24.13330.2011. Svaynyye fundamenty. Aktualizirovannaya redaktsiya SNiP 2.02.03-85 [Pile foundations. Updated edition of SNiP 2.02.03-85].
  • SP 47.13330.2012. Inzhenernyye izyskaniya dlya stroitel’stva. Osnovnyye polozheniya [Engineering surveys for construction. Basic principles].
  • Togliani, G. (2018). Soil behavior and pile design: lesson learned from recent prediction events - part 2: Unusual NC soils. In M.A. Hicks, F. Pisanó & J. Peuchen (eds.), Cone Penetration Testing 2018. Proceedings of the 4th International Symposium on Cone Penetration Testing (CPT’18), 21-22 June, 2018, Delft, The Netherlands (pp. 623-627). Boca Raton: CRC Press.
  • Trofimenkov, Yu.G., Matyashevich, I.A., Leshin, G.M. & Khanin, R.E. (1983). Dostovernost’ sposobov opredeleniya raschetnoy nagruzki na zabivnuyu svayu [Reliability of methods for determining the estimated load on a driven pile]. Osnovaniya, Fundamenty i Mekhanika Gruntov, 1, 15-17.
  • Viana da Fonseca, A. (2010). CPT regional report for southern Europe. In P.K. Robertson, P.W. Mayne (eds.), 2nd International Symposium on Cone Penetration Testing: CPT’10, Huntington Beach, CA, May 9-10, 2010: conference proceedings. California: CPT’10 Organizing Committee.
  • Xia, Y., Xiong, Z., Dong, X. & Lu, H. (2017). Risk assessment and decision-making under uncertainty in tunnel and underground engineering. Entropy, 19(10), 549. https://doi.org/10.3390/e19100549
  • Yaglom, A.M. & Yaglom, I.M. (1973). Veroyatnost’ i informatsiya [Probability and Information]. Moskva: Nauka.
  • Zhang, Z.R., Sheng, Q., Yang, Y.S., Zhu, Z.Q., Zhang, Y.M. & Wang, Z.W. (2010). Study of size effect of rock mass deformation modulus based on in-situ test. Rock and Soil Mechanics, 31(9), 2875-2881.
  • Zhao, T., Sun, J., Zhang, B. & Li, C. (2012). Analysis of slope stability with dynamic overloading from earthquake. Journal of Earth Science, 23(3), 285-296.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-4ea2fa8d-65f8-4d7a-a968-28358210c238
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