Similar articles

Abstract: structured soft clays are widely distributed in the coastal regions of China. The characteristics of the natural structure greatly influence the compressibility and permeability of marine soft clays and should be considered in the theory of their consolidation. When a large surcharge load is applied to a structured clay deposit, large strains can be induced in the clay layer due to the high compressibility, where the consolidation process follows the large strain assumption. However, there are few published theories of consolidation in which both the natural structure of marine soft clays and the large strain assumption can be considered simultaneously. In this study, a novel large strain consolidation model for structured marine soft clays was developed by considering the variation of structural yield stress with depth and using different calculation methods for initial effective stress of structured clay deposits in the Lagrangian coordinate system. The corresponding solution was derived by the finite difference method. Finally, the influences of the natural structure of soft clays and different geometric assumptions on consolidation behavior were investigated. The results show that the dissipation rate of excess pore water pressure of structured clays under the large strain assumption is expected to be faster than that under the small strain assumption, and the difference in consolidation behavior between the two assumptions increases with the strain level of natural structured clays. If the strain level in the clay layer is more than 15%, the difference in consolidation behavior between the large and small strain assumptions must be considered.

1. This paper presents a new method for estimating large strain consolidation of structured soft clays. Overall, the paper is well written and easy to follow. 2. This manuscript treats with one dimensional large strain consolidation problem on the marine soft clay composed of structured soils. Analytical procedure is proposed for structured soils to estimate the settlements. The manuscript is overall well written and large strain and structured soils are new point.

海相沉积结构性软土一维大应变固结分析

[1]Burland JB, 1990. On the compressibility and shear strength of natural clays. Géotechnique, 40(3):329-378.

[2]Cao YC, Chen YM, Huang MS, 2006. One-dimensional nonlinear consolidation analysis of structured natural soft clay subjected to arbitrarily time-dependent construction loading. Chinese Journal of Geotechnical Engineering, 28(5):569-574 (in Chinese).

[3]Cargill KW, 1984. Prediction of consolidation of very soft soil. Journal of Geotechnical Engineering, 110(6):775-795.

[4]Chai JC, Miura N, Zhu HH, et al., 2004. Compression and consolidation characteristics of structured natural clay. Canadian Geotechnical Journal, 41(6):1250-1258.

[5]Chen YM, Tang XW, Jia N, 2007. Consolidation of sensitive clay with vertical drain. International Journal for Numerical and Analytical Methods in Geomechanics, 31(15):1695-1713.

[6]de Simone P, Viggiani C, 1975. Settlement of a thick bed of normally consolidated uniform clay. Géotechnique, 25(2):390-393.

[7]Gibson RE, England GL, Hussey MJL, 1967. The theory of one-dimensional consolidation of saturated clays. Géotechnique, 17(3):261-273.

[8]Gibson RE, Schiffman RL, Cargill KW, 1981. The theory of one-dimensional consolidation of saturated clays. II. Finite nonlinear consolidation of thick homogeneous layers. Canadian Geotechnical Journal, 18(2):280-293.

[9]Hong ZS, Zeng LL, Cui YJ, et al., 2012. Compression behaviour of natural and reconstituted clays. Géotechnique, 62(4):291-301.

[10]Horpibulsuk S, Shibuya S, Fuenkajorn K, et al., 2007. Assessment of engineering properties of Bangkok clay. Canadian Geotechnical Journal, 44(2):173-187.

[11]Hu AF, Xia CQ, Cui J, et al., 2018. Nonlinear consolidation analysis of natural structured clays under time-dependent loading. International Journal of Geomechanics, 18(2):04017140.

[12]Indraratna B, Zhong R, Fox PJ, et al., 2017. Large-strain vacuum-assisted consolidation with non-Darcian radial flow incorporating varying permeability and compressibility. Journal of Geotechnical and Geoenvironmental Engineering, 143(1):04016088.

[13]Li BH, Xie KH, Ying HW, et al., 2000. Analysis of one dimensional nonlinear large-strain consolidation of soft clay. Chinese Journal of Geotechnical Engineering, 22(3):368-370 (in Chinese).

[14]Li CX, Wang CJ, Wang S, et al., 2017a. Analysis on nonlinear consolidation of structural soft soil by considering non-Darcian flow. Journal of Jiangsu University (Natural Science Edition), 38(4):472-478 (in Chinese).

[15]Li CX, Wang CJ, Lu MM, et al., 2017b. One-dimensional large-strain consolidation of soft clay with non-Darcian flow and nonlinear compression and permeability of soil. Journal of Central South University, 24(4):967-976.

[16]Mataic I, Wang DX, Korkiala-Tanttu L, 2016. Effect of destructuration on the compressibility of Perniö clay in incremental loading oedometer tests. International Journal of Geomechanics, 16(1):04015016.

[17]Mishra A, Patra NR, 2019. Long-term response of consolidating soft clays around a pile considering non-Darcian flow. International Journal of Geomechanics, 19(6):04019040.

[18]Morris PH, 2002. Analytical solutions of linear finite-strain one-dimensional consolidation. Journal of Geotechnical and Geoenvironmental Engineering, 128(4):319-326.

[19]Nagaraj TS, Murthy BRS, Vatsala A, et al., 1990. Analysis of compressibility of sensitive soils. Journal of Geotechnical Engineering, 116(1):105-118.

[20]Ozelim LCDSM, Camapum de Carvalho J, Cavalcante ALB, et al., 2015. Novel approach to consolidation theory of structured and collapsible soils. International Journal of Geomechanics, 15(4):04014064.

[21]Pu HF, Song DB, Fox PJ, 2018. Benchmark problem for large strain self-weight consolidation. Journal of Geotechnical and Geoenvironmental Engineering, 144(5):06018002.

[22]Tan T, Scott RF, 1988. Finite strain consolidation–a study of convection. Soils and Foundations, 28(3):64-74.

[23]Townsend FC, McVay MC, 1990. SOA: large strain consolidation predictions. Journal of Geotechnical Engineering, 116(2):222-243.

[24]Wang J, Chen YM, 2003. Analytical solution to 1-D consolidation of uniform structured soft foundation. Journal of Hydraulic Engineering, 34(3):19-24 (in Chinese).

[25]Wang LZ, Li LL, 2007. Field disturbance of structured clay and its effect on settlements of soil foundation. Chinese Journal of Geotechnical Engineering, 29(5):697-704 (in Chinese).

[26]Wang LZ, Ding L, Chen YM, et al., 2004. Study on compressibility of structured soft soil. China Civil Engineering Journal, 37(4):46-53 (in Chinese).

[27]Weber WG, 1969. Performance of embankments constructed over peat. Journal of the Soil Mechanics and Foundations Division, 95(SM1):53-76.

[28]Xie KH, Leo CJ, 2004. Analytical solutions of one-dimensional large strain consolidation of saturated and homogeneous clays. Computers and Geotechnics, 31(4):301-314.

[29]Xie KH, Xia CQ, An R, et al., 2016. A study on the one- dimensional consolidation of double-layered structured soils. Computers and Geotechnics, 73:189-198.

[30]Zeng LL, Hong ZS, Cai YQ, et al., 2011. Change of hydraulic conductivity during compression of undisturbed and remolded clays. Applied Clay Science, 51(1-2):86-93.