RESULTS OF COMPRESSION TESTING ON PSEUDO-COHESIVE SOIL
Pages 61-72
Natural non-treated sand reinforced with randomly oriented short polypropylene fibers of 12 mm in length was tested to determine creep characteristics. This study is a part of the research aimed at encouraging fibrosand (FRS) application in subsoils, embankments and retaining wall constructions. Fiber content was accounted for 0.93 %. Twin specimens were put to creep tests (1-D compression) using the two curve method. The test results were analyzed and checked with the use of ageing, hardening and hereditary creep theories. On the basis of approximation of the test results the creep deformation equation at constant stress for tested fibrosand was obtained. The assessment of fibrosand secondary compression was carried out by the FORE method. As a result, the value of the void ratio by the end of the secondary compression had been eu=0.7041. For determination of the beginning of the secondary compression the rate equation was superimposed on the empirical curve. The point of the graph divergence is the beginning of the secondary compression process. The secondary compression had begun by the time moment being equal to 9360 min. The void ratio by the beginning of the secondary compression had amounted to 0.70574. Fibrosand is a specific type of improved soil relating to so-called pseudo-cohesive soil. This type of soil is characterized by cohesion like cohesive soils, but, at the same time, by the filtration coefficient of about 1 m per day like non-cohesive soils. Pseudo-cohesive soil testing helps to understand the distinctive features of the stress-strain state of this kind of materials. Municipal solid waste also relates to them.
DOI: 10.22227/1997-0935.2015.9.61-72
- Meschyan S.R. Eksperimental’naya reologiya glinistykh gruntov [Experimental Rheology of Clayey Soils]. Moscow, Nedra Publ., 1985, 342 p. (In Russian)
- Meschyan S.R. Experimental Rheology of Clayey Soils. Leiden, Netherlands, CRC Press, 1995, 460 p.
- Vyalov S.S. Reologicheskie osnovy mekhaniki gruntov [Rheological Bases of Soil Mechanics]. Moscow, Vysshaya shkola Publ., 1978, 447 p. (In Russian)
- Maslov N.N. Fiziko-tekhnicheskaya teoriya polzuchesti glinistykh gruntov v praktike stroitel’stva [Physical and Technical Theory of Clayey Soils Creep in the Construction Practice]. Moscow, Stroyizdat Publ., 1984, 176 p. (In Russian)
- Ter-Martirosyan Z.G. Reologicheskie svoystva gruntov i raschety osnovaniy sooruzheniy [Rheological Features of Soils and Calculation of Building Foundations]. Moscow, Stroyizdat Publ., 1990, 200 p. (In Russian)
- Ter-Martirosyan Z.G., Ter-Martirosyan A.Z., Sobolev E.S. Polzuchest’ i vibropolzuchest’ gruntov [Creep and Vibrocreep of Soils]. Perspektivnye napravleniya razvitiya teorii i praktiki v reologii i mekhanike gruntov : trudy XIV Mezhdunarodnogo simpoziuma po reologii gruntov [Promising Directions of Theory and Practice Development in Rheology and Soil Mechanics : Works of the 14th International Symposium on Soil Rheology]. Kazan’, KGASU Publ., 2014, pp. 8—23. (In Russian)
- Murthy V.N.S. Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering. New York, Marcel Dekker, Inc., 2003, 1029 p.
- Mesri G. Primary and Secondary Compression. Soil Behavior and Soft Ground Construction (ASCE GSP). 2003, vol. 119, pp. 122—166.
- Havel F. Creep in Soft Soils. Doctoral Thesis for the Degree of Doctor Engineer. Trondheim, Norway, NGI, 2004. Available at: http://www.diva-portal.org/smash/get/diva2:124915/FULLTEXT01.pdf. Date of access: 14.05.2015.
- Fatahi B., Le T.M., Le M.Q., Khabbaz H. Soil Creep Effects on Ground Lateral Deformation and Pore Water Pressure under Embankments. Geomechanics and Geoengineering. 2013, vol. 8, no. 2, pp. 107—124. DOI: http://dx.doi.org/10.1080/17486025.2012.727037.
- Degago S.A., Grimstad G., Jostad H.P., Nordal S. Misconception about Experimental Substantiation of Creep Hypothesis A. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering. Paris, Presses des Ponts, 2013, pp. 215—218.
- Nakai T., Shahin H.M., Kyokawa H. Rational Expression of Time-Dependent Behavior from Normally Consolidated Soil to Naturally Deposited Soil. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering. Paris, Presses des Ponts, 2013, pp. 255—258.
- Ye Y., Zhang Q., Cai D., Chen F., Yao J., Wang L. Study of New Method of Accelerated Clay Creep Characteristic Tests. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering. Paris, Presses des Ponts, 2013, pp. 461—464.
- Grimstad G., Asrafi M.A.H., Degago S.A., Emdal A., Nordal S. Discussion of Soil creep Effects on Ground Lateral Deformation and Pore Water Pressure under Embankments. Geomechanics and Geoengineering. 2015. DOI: http://dx.doi.org/10.1080/17486025.2014.985338. Available at: http://www.tandfonline.com/doi/abs/10.1080/17486025.2014.985338?journalCode=tgeo20#.VfAc9GcVhpF/. Date of access: 15.04.2015.
- Meschyan S.R. Metodika opredeleniya kharakteristik polzuchesti skeleta glinistykh gruntov primenitel’no k usloviyam odnomernogo uplotneniya [Methods of Estimating the Creep Characteristics of Clayey Soil Skeleton in Relation to One-Dimension Compaction Conditions]. Izvestiya akademii nauk Armyanskoy SSR. Seriya: Fiziko-matematicheskie nauki [News of the Academy of Sciences of the Armenian Soviet Socialist Republic. Series: Physical and Mathematical Sciences]. 1964, vol. 17, no. 3, pp. 119—131. (In Russian)
- Meschyan S.R. Mekhanicheskie svoystva gruntov i laboratornye metody ikh opredeleniya [Mechanical Features of Soils and Laboratory Methods of Their Estimation]. Moscow, Nedra Publ., 1974, 192 p. (In Russian)
- Meschyan S.R. Nachal’naya i dlitel’naya prochnost’ glinistykh gruntov [Initial and Creep-Rupture Strength of Clayey Soils]. Moscow, Nedra Publ., 1978, 207 p. (In Russian)
- Handy R.L. First-order Rate Equations in Geotechnical Engineering. Journal of Geotechnical and Geoenvironmental Engineering. 2002, vol. 128, no. 5, pp. 416—425.
- Ofrikhter V.G., Ofrikhter Ya.V. Otsenka mekhanicheskoy polzuchesti fibropeska po rezul’tatam kompressionnykh ispytaniy [Estimation of the Mechanical Creep of Fibrosand according to the Results of Compression Tests]. Izvestiya KGASU [News of the Kazan State University of Architecture and Engineering]. 2014, no. 4 (30), pp. 222—229. (In Russian)
- Casagrande A., Fadum R.E. Notes on Soil Testing for Engineering Purposes. Harvard Soil Mechanics Series, 1940, vol. 8, 74 p.
- Taylor D.W. Fundamentals of Soil Mechanics. New York, John Wiley & Sons Inc., 1948, 700 p.