Engineering Survey Vol. XI, No. 11/2017
Chernyshov S.N., Martynov A.M.
Chernyshov S.N., Martynov A.M., 2017. The inaccuracy of interpolation at the construction of boundaries in the engineering geological soil profiles for the generation of calculated models of geological medium. Engineering Surveys, Vol. XI, No. 11, pp. 32-43, https://doi.org/10.25296/1997-8650-2017-11-32-43.
On the basis of the recent data, construction accuracy of geological boundaries on engineering geological soil profiles is studied. The concept of the interpolation error of geological boundaries is introduced. This error inevitably presents in all engineering geological soil profiles, as well as in hydrogeological and other geological soil profiles. The error is caused by uncertainty of the state of geological boundary between the wells. Geologists draw the line on the basis of the hypothesis about its genesis. The hypothesis is being checked at the next stage of the investigations, or at the opening of the foundation pit, or already during the examination of the accident. The interpolation error fundamentally influences the character of the engineering geological model of the geological medium, and through this, it influences the quality of the system’s calculation of the building-base. The article proposes methods for defining the interpolation error, based on the study of existing engineering geological soil profiles and outcrops of rocks. Using the example of analysis of engineering geological soil profiles for investigations objects located in the south-west of Moscow and the south of the Nizhny Novgorod region, it is shown that the interpolation error for the bottom of technogenetics soils and the shale drapes can reach 1 meter with a distance between wells of less than 40 meters and much more than 1 meter at the interwell spacing is 100 meters. Such inaccuracies in engineering geological information lead to an inaccuracy in the settlement calculation of the building exceeding 50% of the calculated value. The article presents, on the basis of mathematical-statistical analysis, the values of the interpolation error for seven geological boundaries of a different genetic type. The specified scientific and technical problem of assessing the accuracy of engineering geological survey information, in terms of the geometry of the engineering geological model of the geological medium, requires further research and reflection in normative documents, in particular in SP 47.13330.2016 «SNiP 11-02-96 Engineering surveys for construction. Funda-mentals», from which the table 6.2, which existed in previous editions of the document and was aimed at increasing the accuracy of geological soil profiles, are excluded.
1. Bondarik G.K., 1971. Engineering-geological theoretical framework of rock formation characteristics. Nedra, Moscow. (In Russ.).
2. Ivanova I.N., 1967. An approximate statistical method of determination the optimal quantity of engineering-geological sample of soil. Academic journal. Geology and Exploration, No. 3, pp. 72–78. (In Russ.).
3. Trophimov V.T., Voznesenskiy E.A., Korolev V.A. (eds.), 2011. Engineering geology in Russia, vol. 1., Soils of Russia. KDU, Moscow. (In Russ.).
4. Sergeev E.M. (ed.), 1978. USSR Engineering geology. In 8 volumes, vol. 1. Publishing House of Moscow State University, Moscow. (In Russ.).
5. Komarov I.S., 1972. Gathering and processing of information in engineering-geological investigation. Nedra, Moscow. (In Russ.).
6. Seraphim (Chichigagov), hieromartyr, 2015. Annals of Seraphim-Diveyevo Convent. Publishing House of the Holy Trinity Seraphim- Diveyevo Convent. (In Russ.).
7. Osipov, V.I., Medvedev O.P. (eds.), 1997. Moscow: geology and the city. AO «Moscow textbooks and cartography», Moscow. (In Russ.).
8. Pankov A.A., 2010. A comprehensive assessment of informative value of drilling and statistical reconnaissance in engineering-geological investigation. Research and methodological journal “Academic journal. Geology and Exploration”, No. 1, pp. 73–75. (In Russ.).
9. Ratz M.V., 1968. Rock formations heterogeneity and their physical characteristics. Science, Moscow. (In Russ.).
10. Urbakh V.Yu., 1964. Biometric methods. Science, Moscow. (In Russ.).
11. Chernyshev S.N., 1963. Drainage properties of traprocks (statistical analysis). Moscow association of nature investigators bulletin (MOIP), geological department, vol. 38, pp. 143–144. (In Russ.).
12. Chernyshev S.N., 2009. Engineering geological conditions, Basements and ground facilities of Seraphim-Diveyevo Convent. «Bulletin of MGSU», No. 1, pp. 77–85. (In Russ.).
13. Chernyshev S.N., Tazina N.G., Darchiya V.I., 2014. Landscaping and fixing slopes of ditch and earth rampart in St. Magnificat Groove in Diveyevo. Collected papers from the 5th International research-to-practice Simposium «Environmental conditions of construction and preservation of Orthodox Rus cathedrals». Sergiyev Posad, pp. 207–230. (In Russ.).
14. Chernyshev S.N., Krivoguzov A.A., 2017. Error margins during application of geological borders on engineering-geological drill- holes columns. Engineering surveys, No. 5, pp. 22–27. (In Russ.).
15. Chernyshev S.N., Martynov A.M., 2017. Error margins in calculating foundation settlement in consequence of error margins in geological delimination on the ground. Col. “Mechanics of compound material and constructions, complex and heterogeneous environment”. Collected papers from All-Russian scientific conference. Moscow, Nov. 21st-23rd, 2017. IPRIM Russian Academy of Sciences, Moscow, pp. 382–384. (In Russ.).
16. Chernyak Ae. R., 2009. About assessment of engineering survey results — positive and various. Engineering investigations, No. 1, pp. 34–37. (In Russ.).
17. Chernyak Ae.R., 2011. New approach to setting the interwell spacing in engineering geological investigations. Engineering investigations, No. 3, pp. 4–7. (In Russ.).
SERGEY N. CHERNYSHOV
Moscow State (National Research) University of Civil Engineering; Moscow, Russia; 9581148@list.ru
Address: Bld. 26, Yaroslavskoe Hwy, 129337, Moscow, Russia
ALEKSEI M. MARTYNOV
Moscow State (National Research) University of Civil Engineering; Moscow, Russia; martynov30am@gmail.com