Modelling of elastoviscoplastic properties of the subgrade. Problem statement 2
https://doi.org/10.21780/2223-9731-2017-76-1-61-64
Abstract
Research of railway embankments in terms of physical and chemical mechanics were conducted discretely, without the creation of a coherent model of stability of layered systems, taking into account all the determining factors. The article shows that attention should be focused on the process of blurring the boundaries "crushed stone granules - layer of sand", "layer of sand - loam or clay" when running freight trains as well as the limiting stability of layered granular system. The presence of natural inhomogeneities of structure and change in the density of the underlying soils, especially in wet periods, violations of construction technology of sugrade embankment, dynamic loads on the rails due to vibrations of "bogie - train" system leads to the formation of wave-like ground subsidence. Vibration fields generated in the water and viscoplastic fluids, increase the rate of rise of water in capillaries and porous media in dozens of times because of reduced hysteresis in the contact angle of wet and wall effects. Therefore, the vibration of the field arising from the train handling, contribute to flooding and penetration of clay soils in the pore space of sand due to a significant reduction of the structural viscosity and yield value of a non-Newtonian media. In studies of clay media and other systems all the effects should be taken into account: deformation thixotropy, "gelation" in strong electromagnetic fields, wall effects, which significantly increase the flow rate of hydrated clay in suffosion capillaries of sand and crushed stone cushion layer.
About the Author
V. M. Bel’Kov
Joint Stock Company “Railway Research Institute” (JSC “VNIIZhT”)
Russian Federation
Russian Federation
References
1. Bel’kov V. M. Modelirovanie uprugovyazkoplasticheskikh svoystv zemlyanogo polotna. Postanovka zadachi 1 [Modeling elastoviscoplastic properties of subgrade. Statement of the problem 1]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 2016, Vol. 75, no. 6, pp. 334–338.
2. Vyalov S. S. Reologicheskie osnovy mekhaniki gruntov: ucheb. posobie dlya stroit. vuzov [Rheological basics of soil mechanics: a manual for schools for construction engineers]. Moscow, Vysshaya shkola [Higher school] Publ., 1978, 447 p.
3. Gol’dshteyn M. N. Mekhanicheskie svoystva gruntov [Mechanical properties of soils]. Moscow, Stroyizdat Publ., 1971, 368 p.
4. Adamov A. A., Matveenko V. P., Trufanov N. A., Shardakov I. N. Metody prikladnoy vyazkouprugosti [Methods of applied visco-elasticity]. Yekaterinburg, UrO RAN Publ., 2003, 411 p.
5. Mashchenko A. V., Ponomarev A. B., Sychkina E. N. Spetsial'nye razdely mekhaniki gruntov i mekhaniki skal'nykh gruntov. Ucheb. posobie [Special sections of soil mechanics and mechanics of rocky soils. Tutorial]. Perm, Perm National Research Polytechnological University Publ., 2014, 176 p.
6. Churaev N. V. Fiziko-khimiya protsessov massoperenosa v poristykh sredakh [Physic and chemistry of of mass transfer in porous media]. Moscow, Khimiya Publ., 1990, 272 p.
7. Dydyshko P. I. Zemlyanoe polotno zheleznodorozhnogo puti: Spravochnik [Subgrade of railway track: Reference book]. Moscow, Intext Publ., 2014, 415 p.
8. Shakhunyants G. M. Zheleznodorozhniy put’ [Railway track]. Moscow, Transport Publ., 1987, 479 p.
9. Popov S. N. Ballastniy sloy zheleznodorozhnogo puti [Ballast layer of railway track]. Moscow, Transport Publ., 1965, 184 p.
10. Kamenskiy V. B. Sovershenstvovanie sistemy vedeniya putevogo khozyaystva v sovremennykh usloviyakh raboty zheleznykh dorog. Kand. tekhn. nauk diss. Aftoref. [Improving the system of maintaining the track facilities in modern conditions of railways. Cand. tech. sci. diss. Synopsis]. Moscow, 2011, 23 p.
11. Ogibalov P. M., Mirzadzhanzade A. Kh. Nestatsionarnye dvizheniya vyazkoplasticheskikh sred [Nonstationary movements of visco-plastic media]. Moscow, Moscow State University Publ., 1977, 322 p.
12. Astarita G., Marucci G. Osnovy gidromekhaniki nen'yutonovskikh zhidkostey [Fundamentals of fluid mechanics of non-Newtonian fluids]. Moscow, Mir Publ., 1978, 312 p.
13. Naumov V. V. Obespechenie rabotosposobnosti zheleznodorozhnykh nasypey na uchastkakh obrashcheniya poezdov s povyshennymi osevymi nagruzkami. Kand. tekhn. nauk diss. Aftoref. [Ensuring performance of railway embankments on sections with trains handling with high axial loads. Cand. tech. sci. diss. Synopsis]. Moscow, 2013, 23 p.
14. Naumov V. V. Nadezhnost' zemlyanogo polotna na uchastkakh obrashcheniya tyazhelovesnykh poezdov [Reliability of subgrade in sections handling heavy haul trains]. Vestnik DIIT, 2009, no. 5, pp. 183 – 186.
15. Naumov V. V., Vinogradov V. V. Zemlyanoe polotno pri vozdeystvii povyshennykh osevykh nagruzok [Subgrade when exposed to increased axial loads]. Put’ i putevoye khozyaystvo [Railway track and facilities], 2011, no. 1, pp. 23 – 24.
16. Konshin G. G. Vibratsionniy metod diagnostiki nasypey [Vibration method for monitoring embankements]. Put’ i putevoye khozyaystvo [Railway track and facilities], 2007, no. 10, pp. 22 – 25.
17. Naumenko N. E., Markova O. M., Kovtun E. N., Malyy V. V. Opredeleniye deformatsii gruntovogo osnovaniya pod deystviem vremennoy nagruzki [Detection of deformation of soil ground under influence of temporary loads]. Tekhnicheskaya mekhanika [Technical mechanics], 2015, no. 2, pp. 71 – 78.
18. Rybkina O. V. Ob ustoychivosti dvizheniya granits razdela dvukh vyazkoplasticheskikh zhidkostey [On stability of moving of separating limits of visco-plastic liquids]. Tezisy doklada konferentsii Problemy mekhaniki sploshnykh sred i fiziki vzryva [Paper abstracts. Problems of mechanics of continuous medium and explosion physics]. 17 – 22 September, Novosibirsk, 2007, pp. 54 – 57.
19. Ivantsov A. O. Chislennoye issledovaniye osrednennykh effektov vozdeystviya vysokochastotnykh postupatel’nykh vibratsiy na neodnorodnye gidrodinamicheskiye sistemy. Kand. fiz.-mat. nauk. diss. Aftoref. [Quantity research of averaging exposure effects on high frequency translation vibrations on non-homogenous hydro-dynamic systems. Cand. phys.-math. sci. diss. Synopsis]. Perm, 2009, 25 p.
20. Bel’kov V. M., Shatov A. A. Matematicheskaya model’ kapillyarnoy propitki poristykh sred vyazkoplasticheskimi zhidkostyami [Mathematical model of capillary intake of porous medium with visco-plastic liquids]. Kolloydnyi zhurnal [Colloidal journal], 1992, Vol. 54, no. 3, pp. 16 – 20.
21. Bel’kov V. M., Teplyakova E. A. Dinamika migratsii nefteproduktov vo vlazhnykh pochvogruntakh [Migration dynamic of oil-products in wet soil grounds]. Problemy zheleznodorzhnogo transporta, zadachi I puti ikh resheniya. Sb. tr. OAO "VNIIZhT" [Problems of railway transport, challenges and ways of solution. Proc. of JSC "VNIIZhT"]. Moscow, Intext Publ., 2012, pp. 207 – 215.
Review
For citations:
Bel’Kov V.M. Modelling of elastoviscoplastic properties of the subgrade. Problem statement 2. RUSSIAN RAILWAY SCIENCE JOURNAL. 2017;76(1):61-64. (In Russ.) https://doi.org/10.21780/2223-9731-2017-76-1-61-64
Views:
592
.jpg)
Email this article 