ASCE GSP 261-2016 GEOSYNTHETIC CIVIL INFRASTRUCTURE DISASTER MONITORING AND ENVIRONMENTAL GEOTECHNICS.pdf
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1、GMSEGEOTECEOSYNONITOLECTED GEGeo-PHNICALGEOTHETICRING, APAPERS O-CHINAShandoChineInstitute oublished bSPECI-CHCIVIL IND ENVFROM THINTERNJuly 2ShanSPONShandong DeparUniversise Nationf the AmeEDSao-JenXinzhuaKwok-Leby the AmerAL PUBINANFRASTIRONMEE PROCEATIONA527, 201dong, ChinSORED BYng Univertment o
2、f Tty of Oklahal Sciencerican SocieITED BY g Chao, Png Cui, Pung Pun, ican SocietyLICATIO20RUCTURNTAL GEDINGS L CONFE6 a sity ransportathoma Foundatioety of Civih.D. h.D. Ph.D. of Civil EnON NO.16 E, DISAEOTECHOF THE FRENCE ion n l Engineergineers 261 STER NICS OURTHs Published by American Society o
3、f Civil Engineers 1801 Alexander Bell Drive Reston, Virginia, 20191-4382 www.asce.org/publications | ascelibrary.org Any statements expressed in these materials are those of the individual authors and do not necessarily represent the views of ASCE, which takes no responsibility for any statement mad
4、e herein. No reference made in this publication to any specific method, product, process, or service constitutes or implies an endorsement, recommendation, or warranty thereof by ASCE. The materials are for general information only and do not represent a standard of ASCE, nor are they intended as a
5、reference in purchase specifications, contracts, regulations, statutes, or any other legal document. ASCE makes no representation or warranty of any kind, whether express or implied, concerning the accuracy, completeness, suitability, or utility of any information, apparatus, product, or process dis
6、cussed in this publication, and assumes no liability therefor. The information contained in these materials should not be used without first securing competent advice with respect to its suitability for any general or specific application. Anyone utilizing such information assumes all liability aris
7、ing from such use, including but not limited to infringement of any patent or patents. ASCE and American Society of Civil EngineersRegistered in U.S. Patent and Trademark Office. Photocopies and permissions. Permission to photocopy or reproduce material from ASCE publications can be requested by sen
8、ding an e-mail to permissionsasce.org or by locating a title in ASCEs Civil Engineering Database (http:/cedb.asce.org) or ASCE Library (http:/ascelibrary.org) and using the “Permissions” link. Errata: Errata, if any, can be found at http:/dx.doi.org/10.1061/9780784480045 Copyright 2016 by the Americ
9、an Society of Civil Engineers. All Rights Reserved. ISBN 978-0-7844-8004-5 (PDF) Manufactured in the United States of America. Preface This Geotechnical Special Publication (GSP) contains 20 papers presented at the 4th GeoChina International Conference held in Shandong, China from July 25 to 27, 201
10、6. The conference is endorsed by a number of leading international professional organizations. The technical programs for the 4th GeoChina International Conference came into contact with a balance between the fundamental theories and field applications. The papers in this GSP address a mixture of cu
11、rrent issues in the Advances in Unsaturated Soil, Seepage, and Environmental Geotechnics, Natural Hazard and Disaster Monitoring, and Geosynthetic Reinforced Soil Retaining Structure. Furthermore, this GSP includes investigations and solutions from numerous countries, and it expands ranges of tools
12、that are available to engineers and scientists. Acknowledgments The following individuals have assisted on preparing the GSP and reviewing the papers: Howard Hwang, Hui-Mi Hsu, An Cheng, Wei-Ting Lin, Jiong Zhang, and Yingjie Zheng. *HR and Patrick J. Fox, F.ASCE21Professor, School of Civil Engineer
13、ing and Mechanics, Huazhong Univ. of Science and Technology, Wuhan, Hubei 430074 China. E-mail: 2Shaw Professor and Head, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., University Park, PA 16802. E-mail: pjfoxengr.psu.edu Abstract: This paper presents a numerical investigat
14、ion of the effects of large strain consolidation on contaminant transport in multi-layer soils. Numerical simulations were conducted using the CST3 model, which accounts for one-dimensional coupled large strain consolidation and contaminant transport in saturated multi-layer porous media. The consol
15、idation algorithm accounts for vertical strain, soil self-weight, general constitutive relationships, relative velocity of fluid and solid phases, changing compressibility and hydraulic conductivity during consolidation, unload/reload, time-dependent loading, time-dependent boundary conditions, exte
16、rnal hydraulic gradient, variable preconsolidation stress profiles, and multiple soil layers with different material properties. The contaminant transport algorithm accounts for advection, diffusion, mechanical dispersion, linear and nonlinear sorption, equilibrium and nonequilibrium sorption, poros
17、ity-dependent effective diffusion coefficient, and first-order decay reactions. Simulation results indicate that layered soil heterogeneity can have significant effects on both consolidation behavior and contaminant transport behavior. Characterization of a multi-layer soil stratum as a homogeneous
18、single layer with average properties may result in significant errors in the analysis of consolidation-induced contaminant transport in multi-layer soils. INTRODUCTION The phenomenon of consolidation-induced contaminant transport is observed in a variety of geoenvironmental engineering applications,
19、 including contaminant transport through landfill bottom liner systems during waste placement operations, confined disposal of dredged contaminated sediments, and subaqueous capping of contaminated sediments (Fox and Shackelford 2010). For these applications, contaminant transport processes involve
20、advection, dispersion, and sorption, which is *HR Li and Cleall 2011), very limited progress has been made in the area of coupled consolidation and contaminant transport in multi-layer soils. Recently, Pu and Fox (2015b) developed a piecewise-linear numerical model, called CST3, to model such proble
21、m. This paper provides an overview of the capabilities of the CST3 model. Then, numerical simulations were performed using CST3 to illustrate the effects of layered soil heterogeneity on the consolidation results and associated contaminant transport results. The errors for modeling multi-layer soils
22、 as a homogeneous single layer were discussed for the analysis of consolidation-induced contaminant transport in multi-layer soils. MODEL DESCRIPTION CST3 was developed on the basis of the CS2, CS3 and CST2 models and follows similar procedures with regard to geometry, effective stress, fluid flow,
23、settlement, and contaminant transport. The CST3 model and its predecessors have undergone extensive validation, including comparisons with experimental data (e.g., Fox and Berles 1997; Fox 2007b; Fox and Lee 2008; Lee and Fox 2009; Pu and Fox 2015b). Only a brief summary is provided below. A saturat
24、ed compressible soil stratum has initial height ToH , contains iR horizontal layers, and is treated as an idealized two-phase material in which the solid particles and pore fluid are incompressible. The initial geometry, prior to application of surcharge load at time t = 0, is shown in Fig. 1. The s
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