УПРОЩЕННЫЙ МЕТОД РАСЧЕТА КРИВЫХ КОНСОЛИДАЦИИ ОСНОВАНИЙ С ВЕРТИКАЛЬНЫМИ ДРЕНАМИ A simple method for calculating settlement-time curves of PVD-improved deposits

Fang Xu, Jinchun Chai, Rusong Nie, Wuming Leng, Qi Yang, Yang Zhou

Аннотация


Предлагается упрощенный метод расчета кривых консолидации для основания, оборудованного вертикальными дренами заводского изготовления (PVD), с учетом действия нагрузки, изменяющейся во времени. Эффективность метода была проверена численными исследованиями с использованием конечно-элементного анализа. Авторами проведен экспериментальный анализ действия пригрузки опытной насыпью грунтового основания, оснащенного PVDдренами, продемонстрировавший практическую применимость предлагаемого метода. В инженерной практике рекомендуется для уплотнения слабого водонасыщенного основания использовать не менее четырех ступеней нагружения.

Полный текст статьи опубликован в английской версии журнала
"Soil Mechanics and Foundation Engineering".


Литература


D. T. Bergado, A. S. Balasubramaniam, R. G. Fannin, and R. D. Holtz, “Prefabricated vertical drains (PVDs) in soft Bangkok clay: a case study of the new Bangkok International Airport project,” Can. Geotech. J., 39(2), 304-315, (2002).

B. Indraratna, I. Sathananthan, C. Rujikiatkamjorn, and A. S. Balasubramaniam, “Analytical and numerical modeling of soft soil stabilized by prefabricated vertical drains incorporating vacuum preloading,” Int. J. Geomech., 5(2), 114-124, (2005).

Z. H. Sun, M. J. Gao, and W. Zhou, “Assessment of vacuum preloading of soft sediment applied to various drainage schemes,” Soil Mech. Found. Eng., 50(6), 255-261 (2014).

J. C. Chai, and F. Xu, “Experimental investigation of lateral displacement of PVD-improved deposit,” Geomech. Eng., 9(5), 585-599, (2015).

Y. Zhuang, and X. Y. Cui, “Evaluation of vacuum preloading with vertical drains as a soft soil improvement measure,” Soil Mech. Found. Eng., 53(3), 210-217 (2016).

J. C. Chai, C. Y. Ong, D. T. Bergado, and J. P. Carter, “Lateral displacement under combined vacuum pressure and embankment loading. Géotechnique, 63(10), 842 –856, (2013).

F. Xu, and J. C. Chai, “Lateral displacement of PVD-improved deposit under embankment loading,” Geosynth. Int., 21(5), 286-300, (2014).

G. Zhu, and J. H. Yin, “Design charts for vertical drains considering construction time,” Can. Geotech. J., 38(5), 1142-1148, (2001).

E. Conte, and A. Troncone, “Radial consolidation with vertical drains and general time-dependent loading,” Can. Geotech. J., 46(1), 25-36, (2009).

X. Y. Geng, B. Indraratna, and C. Rujikiatkamjorn, “Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems,” Int. J. Geomech., 12(1), 27-42, (2012).

M. M. Lu, S. Y. Wang, S. W. Sloan, B. Indraratna, and K. H. Xie, “Nonlinear radial consolidation of vertical drains under a general time-variable loading,” Int. J. Numer. Anal. Met. Geomech., 39(1), 51-62, (2015).

K. Terzaghi, “Theoretical soil mechanics,” John Wiley & Sons, INC, New York, USA, (1943).

S. Hansbo, “Consolidation of fine-grained soils by prefabricated drains,” P. 10th Int. Conf. Soil Mech. Found. Eng., Stockholm, 3, 677-682, (1981).

J. C. Chai, S. L. Shen, N. Miura, and D. T. Bergado, “Simple method of modeling PVD-improved subsoil,” J. Geotech. Geoenviron. Eng., 127(11), 965-972, (2001).

K. Terzaghi, “Erdbaumechanik auf Bodenphysikalischer Grundlager,” Franz Deuticke, Vienna, Austria, (1925).

I. Sathananthan, B. Indraratna, and C. Rujikiatkamjorn, “Evaluation of smear zone extent surrounding mandrel driven vertical drains using the cavity expansion theory,” Int. J. Geomech., 8(6), 355-365, (2008).

D. H. Shin, C. Lee, J. S. Lee, and W. Lee, “Detection of smear zone using micro-cone and electrical resistance probe,” Can. Geotech. J., 46(6), 719-726, (2009).

N. Carrillo, “Simple two and three dimensional cases in the theory of consolidation of soils,” J. Math. Phys., 21(1), 1-5, (1942).

M. A. Biot, “General theory of three-dimensional consolidation,” J. Appl. Phys., 12(2), 155-164, (1941).

X. Deng, “Improvement of soft highway foundation by combined vacuum pressure and surcharge load,” M.S. Thesis, Central South University, Changsha, China, (2009).

Y. G. Wang, “Theory and experiment of vacuum combined surcharge preloading method for foundation improvement”. Ph.D. Thesis, Central South University, Changsha, China, (2010).

J. O. Osterberg, “Influence values for vertical stresses in a semi-infinite mass due to an embankment loading,” P. 4th Int. Conf. Soil Mech. Found. Eng., London, 1, 393-394, (1957).


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